Qatar Government Project Passed Third-Party Inspection Successfully

 Since establishment, xinyue steel group has nearly 40 years of experience in undertaking projects. With the vision of building the world and serving the whole world, no matter it is a big or small project, complexity or not, Xinyue team will do our best to provide customers with a satisfactory solution.We not only can make the customer satisfied in the service, but also pay more attention to the product quality, aspire to become the reputable supplier in the steel industry.

At the end of last year, we received an inquiry from a new client in Qatar. The inquiry was in the form of rectangular and circular tubes, standard EN10210 heat treatment, with a total of 20 or 30 specifications in different diameters.The products are used for the construction structure of the stadium, and the terminal is the local government. The products must be produced in strict accordance with the standards, and the products can only be delivered after the third party witnesses and agree to provide the 3.2 certificate. Moreover, the delivery time is limited. After understanding the customer's needs, we quickly organized a task force and finally provided the optimal solution. The customer was very satisfied with our solution and quickly decide to start business with us.

After that, our company arranged the third party to witness, and the third party required to extract a test block from each specification and perform the witness according to the standard throughout the whole process, no matter the product appearance, size, chemical composition, mechanical properties, test results are all within the standard range, and finally the third party provided 3.2 certificate as the delivery document.3.2 the certificate is the double recognition and guarantee of the quality of our products, indicating that our products are produced and supplied in strict accordance with the established standards.

In order to meet the customer delivery time, under the premise of ensuring the quality, our company worked overtime, finally within the promised delivery time range to arrange the delivery, ultimately without losing the customer's expectations of smooth delivery.

So far, the customers have highly recognized the product quality, team service and technical support of xinyue, which lays a solid foundation for future win-win cooperation.

Xinyue Steel always insist on the principle of “ Integrity-Based, Customer First, High Quality, High Efficiency, pursing 100% customer satisfaction.

Look forward for working hand in hand for win-win cooperation.

http://www.tjxysteel.com/news/Qatar-Government-Project-Third-Party-Inspection-1301.html

Small diameter ERW of cutting, galvanizing, threading with successfully delivery

 Tianjin Xinyue received the customer's inquiry at the end of February. At the beginning, the customer required to make seamless steel pipe. After several communication, the customer finally decided to make straight welded pipe instead of seamless steel pipe. It’s fix length 3.05 meters, surface galvanized and tube ends was threaded. The thickness of galvanized is 45 microns. This steel tube is the first trial order of the customer for installing lamps.

Straight seam welded pipe surface do galvanized tube and steel tube should be cut into 3.05 meters in length, the customer request strictly, in order to better control the length tolerance, need to cut pipe a a cut, but this will increase the processing cost, in order to meet the needs of customers and orders requirements, tianjin xinyue would like to reduce profits, to ensure that meet customer's technical requirements, so as to achieve the long-term friendly relations of cooperation.

Every piece of steel pipe is strictly inspected by tianjin xinyue quality inspection department. No matter whether the customer has a third party inspection, we will strictly check the customs to meet the highest requirements of each customer.

Xinyue is always on our way to build the world, serve the global , and we always try our best to serve every customers.

Xinyue people sincerely look forward to working with you!

http://www.tjxysteel.com/news/Small-diameter-ERW-successfully-delivery-1302.html

Successful shipment for Aviation Kerosene Transportation Project

 In march, Xinyue received the order from the old customer in South Africa. ERW gr. BN PSL2 . In this spring and blooming April, after the production test for one month.The delivery was completed! And has passed the strict test of SGS in batches, all the physical and chemical tests were up to the standard!

It is a pipeline used for transporting aviation kerosene, the terminal has strict requirements on material quality, so it is necessary to issue the laboratory report certified by CNAS, and SGS is required to do the final inspection to witness the physical and chemical experiments.The experiment lasted 4 days .

The test data are very satisfactory . All four items from different heat Numbers are passed at one time.

The containers have been left China . we hope our customer can get good reputation from this project !

Xinyue is always returns customers with the best product quality and service, and strives for 100% customer satisfaction. Xinyue steel is your most reliable partner. Welcome to cooperate with you again!

http://www.tjxysteel.com/news/shipment-for-Aviation-Kerosene-Transportation-Project-1304.html

How to Prevent Surface Decarburization of Seamless Pipe Products?

 The carbon element in the seamless steel tube (smls) has a great influence on its own performance, so when the seamless tube is decarburized, its service life will be greatly reduced, and if the surface of the seamless tube is decarburized If it is not cleaned, the hardness and wear resistance of the surface layer of the seamless pipe will be reduced, and during quenching, cracks will be formed on the surface of the workpiece due to the different volume changes of the inner and outer layers. Therefore, how to prevent the surface decarburization of seamless pipes is a problem that should be paid attention to in the production process.

The key to solving the problem of surface decarburization lies in the heat treatment process. Since the decarburization and the oxidation of the steel wire are carried out at the same time, the purpose of improving decarburization can be achieved as long as the non-tin seamless pipe is kept in contact with air as little as possible during the heat treatment process. The production process is: the first molten lead tank is used to austenitize the steel wire. The lead liquid is heated to 871? in advance, the steel wire is passed in the lead liquid to achieve austenitization, and then enters the oil tank for quenching, and then enters the second Two molten lead tanks are tempered (482°C). Since the steel wire is not in contact with air in the molten lead, decarburization is effectively avoided. The main problem that needs to be solved with this process is how to prevent lead dust pollution.

The atmosphere that causes decarburization on the surface of seamless pipes is mainly oxidizing gases such as oxygen, water vapor, and carbon dioxide. When these oxidizing gases contact the surface of the heated steel wire, oxidation and decarburization occur simultaneously; because the solid-solution carbon in the iron has a relatively large affinity for these gases, the carbon on the surface is removed first. The above-mentioned gases are generally brought in from outside the furnace; the iron oxide scale, rust on the surface of the seamless pipe and the residues on the surface of the steel wire after cold drawing will also decompose after being heated in the furnace and react to generate some oxidizing gases. We can purposely control the atmosphere in the furnace to make it in a reducing state, which can effectively avoid surface decarburization. For example, controlling the ratio of carbon dioxide to carbon monoxide in the furnace, at the equilibrium point, neither oxidation nor decarburization; when the ratio of carbon dioxide exceeds the equilibrium point, oxidation and decarburization will occur; when the ratio is below the equilibrium point, oxidation and decarburization will not occur . The specific value of the equilibrium point should be calculated based on the carbon content and temperature of the iron.

In addition, it is also an effective measure to inject neutral protective nitrogen into the furnace from the seamless tube. At the same time, it can maintain the positive pressure in the furnace, prevent air infiltration, and reduce or avoid decarburization of steel parts.

https://www.xysteelpipe.com/how-to-prevent-surface-decarburization-of-seamless-pipe-products/

Xinyue Has a Constant Supply Steel Pipe to Nigrian Projects

 In recent years, Tianjin Xinyue Steel Group has established friendly relations with Southeast Asia, South America, European countries. Oil and gas projects in African countries are also on the rise, with Nigerian customers increasingly taking orders.

In February 2020, Tianjin Xinyue Steel group again received inquiries from regular customers in Nigeria. This time, the inquiry is still the same as the last order of seamless tubes, the specifications from 1 inch to 12 inches, a total of more than 2,000 pieces. Due to the experience of last year's transaction, both parties soon reached an agreement on both price and payment terms. At the same time, the customer inquired for 200 tons of ERW tube. After 2-3 days' communication, the customer finally placed the two orders together to Xinyue Steel Group.

Tianjin Xinyue Steel Group began to resume work in early March, the first time to arrange the production department for production. After a month and a half, the production of the order was completed in the middle of April as scheduled and is now waiting for shipment at the port of Tianjin.

No matter what large or small of the order and the complexity of the product, as long as we can help customers to solve the problem, Xinyue Steel Group team will serve customers with a professional attitude.

As the famous pipeline suppliers from China, Xinyue’s goal is to serve for the global market and build the world getting better, warmly welcome to send us inquiry at any time.

http://www.tjxysteel.com/news/Xinyue-Constant-Supply-Steel-Pipe-to-Nigrian-Projects-1305.html

Seamless Steel Tubes And Pipe Fittings To South Africa Passed TPI Inspection

 By the end of May 2020, seamless steel pipes and fittings to South Africa had completed various inspections and were waiting for shipment to South Africa. The transaction of these seamless tubes and fittings stems from the trust and recognition of Xinyue's product quality after customers first cooperated with Xinyue last year.

In July 2019, when the steel market in China was in full swing, we signed our first contract with a new customer in South Africa, and started production soon. After more than a month of production, on the afternoon of August 15th, we received a notice from the customer: August 16th, that is, the next day they will fly to China. Head for on-site inspection and inspection. Although it was a "surprise inspection" of the customer, all the test results passed smoothly.

Meanwhile, we have received a precious praise from our customer:

“ Sorry that we came to visit you in a such hurry schedule, but what you showed me, your work efficiency, really impressed me. We have worked on steel industry for many years, and have seen a lot of factories before, but you Xinyue team is the only one who can give me an comprehensive solution within 20 minutes. I feel really happy to work with you, to work with Xinyue. ”

Based on the first pleasant cooperation, the customer received the goods in September?2019, and after the end customer passed the acceptance, he immediately sent us an inquiry for the second phase of the project. After half a year of bidding process and our full support to customers in the bidding process. In March this year, the customer successfully won the bid, and the second phase of the project customer also gave this order to us. Due to the global epidemic situation, the customer could not come to the factory to inspect the goods in person, so a third-party testing agency was invited to conduct the process inspection.

For such strict three-party testing, it is a common sight in our production. In the past 8 years of export history, we have encountered many process inspections and final inspections from different customers. Each inspection, the customer is very satisfied. During the production process, factory quality inspectors and tripartite inspectors separately conducted all pipe and pipe sample: impact test, tensile test, bending test, elongation test, hardness test and chemical composition test, etc.

The customer has confirmed the tripartite inspection report so far. We will catch up with the bulk carrier at the end of the month and send the shipment to South Africa. This cooperation will undoubtedly give customers a better understanding of Xinyue's quality. We look forward to the next cooperation.

http://www.tjxysteel.com/news/Seamless-Steel-Tubes-And-Pipe-Fittings-To-South-Africa-1343.html

Causes of Defects in Hot rolled Seamless Steel Pipes

 Hot-rolled seamless steel pipe is a round, square, and rectangular steel with a hollow section and no joints on the periphery. When the bending and torsion strength is the same, the weight is lighter. It is an economical cross-section steel. What defects are prone to appear in the production process of steel pipes? Let’s explain it for everyone.

1) Cracks (also known as cracks). Features: The inner and outer surfaces of seamless steel pipes are linear or spiral cracks, and some are mesh-shaped and both ends and bottom of the cracks are sharp.

1. Poor steel quality, with subcutaneous pores and subcutaneous inclusions.

2. Improper heating of the tube billet.

3. The deformation pressure is too large.

2) Hairline, features: continuous or discontinuous hair-like fine lines appear on the outer surface of the seamless steel pipe. Most of the spiral spiral direction is opposite to the direction of rotation of the punch, with a large pitch, and some are similar to a straight line.

1. Poor steel, with subcutaneous pores and subcutaneous inclusions.

2. The surface of the tube blank is incompletely cleaned.

3) Inward fold (commonly known as inner fold), features: straight or spiral zigzag defects on the inner surface of the steel pipe. For high-alloy steel pipes, such defects are irregular blocks and distributed at the entrance. If the fold is caused by centering, it is usually half a circle to a circle, and it is on the head.

1. The amount of pressing down the front of the head is too large.

2. Serious head wear.

3. During the piercing process, the metal in the central part of the blank bears strong alternating stress, so the inner wall of the waste tube is prone to inward bending during rolling.

4. The inward folding at the entrance of the high-alloy steel pipe is caused by uneven force on the roll during piercing.

4) Outer folding, characteristic: the outer surface of the seamless steel pipe is spirally folded, and the spiral direction is opposite to the spiral direction of the waste pipe on the punching machine, and the pitch is relatively large.

1. Defects such as cracks or ears remain on the surface of the tube blank.

2. Poor steel quality, inclusions or serious looseness.

5) Rolling and folding, characteristics: there are regular folding defects on the outer surface of the seamless steel pipe.

It is mainly caused by damage to the roll of the piercing machine or the roll of the tube mill.

6) Bending, characteristics: during rolling, the metal enters the gap between the rolls or the tube loses its stability, causing it to form twists and turns. After sizing, the surface of the steel tube shows local convex and concave wrinkles.

1. The outlet pipe diameter of the equalizing machine is larger than the hole type of the fixed and reducing machine.

2. Incorrect adjustment, misalignment of rolls, inconsistent center lines, etc.

3. The sizing frame is installed upside down.

7) Straight inward folding. Features: The inner surface of the seamless steel pipe is symmetrical or a single straight line folding, distributed over the entire length or part of the steel pipe.

1. The head is severely worn or stuck to metal.

2. The outer diameter of the capillary tube is larger than the width of the grooved hole, the inner diameter is too large or the tube wall is too thin.

3. Unreasonable distribution of reduction of piercing machine and tube rolling machine.

4. Before the second pass of rolling, the 90° overturning was not completed.

https://www.xysteelpipe.com/causes-of-defects-in-hot-rolled-seamless-steel-pipes/

Xinyue Steel ensured all items in good package

 In May 2020, the pipe fittings and pipes ordered by South American customers were successfully shipped, including large-diameter elbows, large and reduction and flanges, pipes and other products. Among them, the diameter of the elbow is 52 inches, 5D, and the volume is large. The flanges are 72 inches and 52 inches. The size is also very special. How to properly package and package these products to prevent any damage from transportation and unloading, become the most important question for Xinyue Steel.

As a professional steel producer and exporter, Xinyue Steel has extensive experience in cargo packaging and shipping. In order to prevent all pipe fittings and pipes from being damaged in the transportation notice, Xinyue decided to carry out factory installation. Our factory has professional forklift cranes and professional workers, and is equipped with professional high-strength slings and tie ropes, so that it is foolproof.

Before packing, our logistics department had a meeting with the sales department for packing antiques, and simulated the drawing to determine the elbows, the selection and strength test of the gasket between the fixed angle of the head and the position of the flange, and the 6 meter steel pipe in Reinforcement measures inside the container. After a few hours of operation, finally all the pipe fittings and pipes were damaged and successfully packed. At the same time, Xinyue's picture recorded the whole to the customer to share the customer's satisfaction.

Xinyue has been paying attention to details, from the documents to the physical, every detail point are carried out strictly accordingly to the customer request, Xinyue always adhering to the "best price, best quality, best delivery time and best service". build brand strength and achieve long-term cooperation with customers.Welcome you enquiry us anytime !

http://www.tjxysteel.com/news/Xinyue-Steel-ensured-all-items-in-good-package-1337.html

TPI Passed, PSL2 X42 ERW long pipe Will Arrive At Construction Site Soon

 On May 10th, all cargo of 1200MT DN400 18meter ERW pipes has been successfully shipped from Tianjin port to Australia. This cargo is the 1st stage of local water pipeline project, has included PSL2 X42 ERW steel pipes and relevant high steel grade flanges & bends & bolts & nuts over 100 items.

Client nominated third party inspection to monitor the whole production process from raw material arrival, including 100% hydrostatic testing & UT testing process. Due to our domestic demands recovered from the pandemic, we met the peak season of feed material production. Material only arrived to mill before our labor holiday. During the Labor holiday, our production team & inspection team still worked overtime to catch up the earliest bulk shipment as client’s request.

Finally all the production & finished products well passed the third party inspection, and client received the perfect QA report. Client also expressed high recognition and appreciation for Xinyue's production speed capability, quality control, and on-time delivery.

Xinyue Steel Group values every client, focus on every item & every details to offer the best service to our clients, build the most superior brand of “XINYUE”.

http://www.tjxysteel.com/news/TPI-Passed-PSL2-X42-ERW-long-pipe-1338.html

Profession Promote Cooperation

 At the end of April 2020, we received an inquiry from a French customer, they required 213 tons ssaw steel pipe with out diameter of 1.2m . The customer mainly engaged in steel trading. This order is mainly used for water pipe projects in Africa, and the pipes are required to arrive at the destination port in July. Xinyue has rich exporting experience in spiral pipe, and has provided for very high quality steel pipe for piling, water transportation, bridge and other projects all over the world for many years, and has been recognized by our customers.

After receiving the inquiry, we quickly gave the best price solution and submitted the project list of Xinyue. Two days later, the customer reported that after the audit, we beat the competitors in Turkey, mainly because the end user was very shocked by our export record of spiral tube and was willing to give us a chance. In early May, the customer was entrusted to visit the factory. Customer audited our factory's certifacte,material tracking , welding quality, how to test, machine brand , production line,how to control the quality during the progress.and also customer witnessed our production process on site. On May 19, the customer said that our qualification and technology had passed the end user’s audit. He also said that cooperation would soon start.

Professional product knowledge, professional production equipment and professional quality control are the most important factors to conquer customers. Price war may lead to a transaction, but it is not the way for long-term survival. So we, Xinyue people, is always on the way to build the world,, have been insisting on providing customers with the best professional services.

we Xinyue is always on the way to build the world, serve the global , and we always try our best to serve every customers.

Xinyue people sincerely look forward to working with you!

http://www.tjxysteel.com/news/Profession-Promote-Cooperation-1339.html

Ductile iron pipe delivered successfully

 　　At end of July 2020, one of Xinyue Steel Group's regular from South Africa sent a new PO again, ductile iron pipe with 11 specifications, Size range DN100-700, it is an stock supplementary order for regular stocks. According client’s requests: ductile iron pipes should confirm to ISO2531-k9, T type joint in lengths of 6 Meters, matched 100% SBR rubber gaskets. Cement lining inside of pipes should confirm to ISO4179, zinc & bitumen coating outside of pipes should confirm to ISO8179, and the rubber gasket should confirm to ISO4633.

　　We’ve suggested client to extend Ex mill time to 50days to ensure this order can be delivered completely, as quantity of some sizes are too far from MOQ for new production and mill’s production was affected by local environment assessment authority recently, which is totally understood by client who agreed our advice. We’ve made purchasing plan & quality requirements for stock option and also the fastest production schedule for those sizes that are not available in stock at the time we received deposit from client. With the cooperation of every depts, all specifications were unexpectedly ready in 20 days.

　　Xinyue QA dept arranged TPI of SGS on this order as soon as received production finish notice from production dept. Inspection contents including: 100% quantity, visual, coating thickness, dimension, marking inspection and QA documents approval.

　　We received high appreciation from client for our high efficiency, high quality and strict quality control when we submitted SGS inspection report to him, who putted forward a new request that they received a new order from local contractor who designated Xinyue Steel as trusted supplier for his project that will be kicked-off soon.

　　We were requested to try our every effort to ensure that all of these products will arrive at destination port within 20 days while the standard voyage time is 30-40 days.

　　The urgency was well learned by Xinyue Steel Group, who confirmed the emergency delivery plan immediately for this order. After evaluation on all feasible options, the shipping line with the fastest sailing time but the most expensive sea freight is finally selected.

　　The vessel arrived at destination port in 2weeks, which helps client delivered all pipe to project site on time.

　　Xinyue Steel Group values every client, focus on every item & every details to offer the best service to our clients, build the most superior brand of “XINYUE”.

　　http://www.tjxysteel.com/news/Ductile-iron-pipe-delivered-1506.html

Performance Comparison of ERW and Spiral Steel Tube

 　　Performance comparison of carbon ERW steel pipe and spiral steel pipe:

　　1. Overview

　　The welding of ERW steel pipe is the skin effect and proximity effect of high-frequency current. The process of using high-frequency current and induced high-frequency current (rising at the end of the 20th century) resistance to heat and melt the edge of the tube blank, and apply squeezing force to weld together process.

　　The welding of SSAW steel pipe is a process in which the weldment, welding wire and flux are melted by the arc under the flux layer, and the molten flux forms a slag to isolate the air and the molten pool from contact, thereby forming a welding joint.

　　There are two main differences:

　　A) SSAW has metal fillers such as wire flux, but ERW does not.

　　B) SSAW forms a weld pool, ERW does not form a weld pool, only a molten state is formed at the edge of the billet.

　　2. Advantages of ERW steel pipe

　　A) Short weld length, HAZ is smaller than SSAW;

　　B)High geometric accuracy;

　　C) If the burr removal device is used, the weld reinforcement is lower than SSAW, and the conveying resistance is small;

　　D) The production efficiency is high, and the welding speed is 15-20m/min, which is more than 10 times that of SSAW.

　　3. Advantages of SSAW steel pipe

　　A) The direction of the weld avoids the direction of the main stress when the pipeline is under pressure;

　　B) A single defect on the weld is less framing;

　　C) Steel strips with the same width can be used to produce steel pipes with different outer diameters, or steel strips with different widths can be used to produce steel pipes with the same outer diameter.

　　4. Welding performance comparison

　　A) ERW has fast heating speed, highly concentrated heat, and no filler metal. It is not possible to use wire flux to add alloying elements to compensate for the burning of alloy elements in the welding process like SSAW, and it cannot effectively improve the structure and performance of welded joints like SSAW (microalloying is the main way to refine grains. Grain refinement is the only way to increase strength and toughness at the same time).

　　B) ERW does not form a welding pool, so the welding dross ability is poor. If there is slag inclusion on the edge of the raw material, it can only remain in the weld and become a quality hazard. However, SSAW forms a welding pool, which is beneficial for slag inclusions to float in the slag.

　　C) There is no slag/gas protection during ERW welding (SSAW has slag protection formed by flux), and the welded joint structure at high temperature is easily oxidized, which makes the welded joint have a tendency to embrittlement.

　　D) ERW has the characteristics of high local heating temperature and short cooling time. The welding temperature field has a large gradient, which is prone to hardening phase and large welding stress. The plasticity and toughness of the welded joint are not ideal. Therefore, all ERW steel pipes in the country require post-weld heat treatment (Q+T or Q+N), but the domestic post-weld heat treatment process is not yet mature.

　　E) Compared with SSAW, the ERW welding speed is too fast, the edge quality of the raw material cannot be tested by NDT, and the NDT test of the weld after welding is also difficult to ensure the quality.

　　F) Since ERW is welded by pressing molten metal, it is difficult to use NDT for effective inspection. Therefore, incomplete fusion and gray spots are the problems of eRw steel pipes, which have been difficult to effectively solve for decades. Groove corrosion in ERW pipeline failure is mainly caused by unfusion.

　　G) ERW will inevitably form more “D” joints during pipeline construction, while SSAW will not. As we all know, the “D” joint is the most concentrated part of the stress, which reduces the fatigue life of the welded joint.

　　H) The residual stress of traditional SSAW pipe is relatively large, and the dimensional accuracy is not as high as ERW. (In fact, the residual welding stress of ERW is also relatively large, of course, a part of it can be eliminated if proper heat treatment can be performed). Nowadays, advanced technologies such as low residual stress forming and mechanical expansion of pipe ends are commonly used for the production of SSAW pipes, and the quality is not much different from LSAW.

　　I) Since ERW has no filler metal, there is almost no reinforcement, which is conducive to FBE or 3PE anti-corrosion treatment. SSAW steel pipe has high welding seam reinforcement, and anti-corrosion requires high welding seam shape. Pay attention to the sudden transition between the welding seam and the base metal, forming a right angle or an acute angle. SSAW steel pipe factory generally adopts external welding double wire welding, the front wire guarantees the penetration, and the rear wire mainly guarantees the shape of the weld to achieve a smooth transition. Judging from the steel pipes produced by our factory, there is almost no right angle or acute angle.

　　https://www.xysteelpipe.com/performance-comparison-of-erw-and-spiral-steel-tube/

Customer choose Xinyue Steel because of trust

 　　The establishment of trust will be affected by many factors, the most important is "reliable". It is essential for qualified products and normative operation of a company. However, The trust is difficult in the international trade due to the distance limit the meeting and on-the-spot testing operation.

　　The regular New Zealand customer who has been cooperating with Xinyue for nearly two years. There are more than dozens of orders, and none of them has any quality, delivery time and other issues. Xinyue has given absolute support to customer in terms of delivery time, quality and project construction solution in their piling project, which has won good reputation for sheet pile construction and gained more project construction cooperation opportunities.

　　The products of this order are more than 300 tons of steel sheet piles with the length of 8 meters, 9 meters and 10 meters. The construction of the project is imminent, which means that the delivery time is tight and particularly important, inventory is the best option which can be satisfied for project, while the length of 8m and 10m is not the stock length of steel sheet pile. Based on the trust of the previous cooperation, the customer does not hesitate to sign the project contract with Xinyue. Long term partner business relationship, mutual benefit and win-win cooperation, Xinyue decided to process the 18 meter inventory sheet pile into the required length for our client.

　　Within a week, the operation of the order is completed. However, as we all know, from September 2020, the world logistics transportation has suffered a serious impact, such as the shortage of containers, the explosion of cargo space, the rejection of containers and other problems. Our Logistics Department overcome various difficulties, strive to reduce the impact of various factors of price increase, finally we delivery materials smoothly for customer.

　　In the international market development of Xinyue for more than ten years, there are quite a number of loyal regular customers. Their support and trust have played a very important role in the development of Xinyue. Xinyue uses high-quality products and professional service to support customers expand rapidly.

　　We are so appreciate that we have you, will with our partner all the way !

　　http://www.tjxysteel.com/news/Customer-choose-Xinyue-Steel-because-of-trust-1551.html

Concerned about whether the rebar peak season can be sustained

 　　It is now mid-November, and the spot market is still showing peak season characteristics, which validates the view that we have repeatedly talked about the peak season delay. "Golden Nine and Silver Ten" is the traditional peak season for consumption, but the spot market in September this year was "not busy". We proposed that the peak season demand was postponed to October and November.

　　However, what needs attention is the sustainability of peak season demand. With reference to previous years, demand will decline after mid-to-late November. According to the predictions of relevant state agencies, the cold air activities affecting our country are frequent and strong this winter, and a wide range of low-temperature rain and snow may occur in northern my country. The low temperature and rain and snow in the northern region mean the loss of construction conditions, but also a decline in the demand for rebar. According to the weather forecast, there will be a large-scale cooling in the second half of this week.

　　The core factor pushing up the price of rebar is strong demand. Once the demand weakens, the price peaking and falling will be a high probability event.

　　Supply pressure still needs to be guarded

　　In addition, supply pressure remains the primary negative factor to beware of. Supply pressure comes from domestic resource supply and the conversion of import and export resources.

　　The domestic resource supply can be analyzed from two perspectives: policy and profit. This year's fall and winter production restriction policy has a very limited impact on rebar output; the recent increase in steel prices has significantly improved corporate production profits, which will increase corporate production enthusiasm.

　　In terms of the transformation of import and export resources, the main reasons are the decrease in exports and the increase in imports. Imports are divided into two parts: steel imports and billet imports. The latest customs data show that from January to October, my country's steel exports decreased by 10.665 million tons year-on-year, steel imports increased by 7.225 million tons year-on-year, and imported steel billets increased by about 12.62 million tons. Overall, domestic steel supply increased by more than 30 million tons.

　　In short, it is recommended that investors who hold long orders of rebar futures gradually stop profit.

　　http://www.tjxysteel.com/news/Concerned-about-rebar-peak-season-can-sustained-1569.html

main characteristics of the development of the private iron and steel economy

 　　The operation of the iron and steel industry and the main characteristics of the development of the private iron and steel economy

　　Since the beginning of the year, in the face of the huge impact of the sudden new crown pneumonia epidemic and the complicated and severe domestic and foreign environment, the steel industry has conscientiously implemented the “six stability” and “six guarantees” decisions and deployments of the Party Central Committee and the State Council, adhered to the prevention and control of the epidemic and stable production and operation Grasping with both hands has achieved good results.

　　Main features of the operation of the steel industry

　　First, the overall operation of the steel industry remained stable. Since the beginning of this year, the iron and steel industry has shown a steady growth in production, a slight rebound in prices, and a gradual improvement in economic performance. According to data from the National Bureau of Statistics, the output of crude steel, pig iron, and steel products nationwide was 781.59 million tons, 665.48 million tons, and 964.24 million tons, respectively, up 4.5%, 3.8%, and 5.6% year-on-year.

　　According to statistics from the Metallurgical Chamber of Commerce, the output of crude steel, pig iron, and steel produced by private steel companies from January to September was 498 million tons, 407 million tons, and 690 million tons, respectively, representing a year-on-year increase of 5.8%, 4.9%, and 6.6%, respectively. National average; crude steel output accounts for 62.8% of the national output.

　　Second, the economic benefits continued to improve. According to the National Bureau of Statistics, the national steel industry realized a total profit of 157.7 billion yuan from January to September, a year-on-year decrease of 18.7%.

　　Statistics of key private steel companies from January to September by the Metallurgical Chamber of Commerce: Sales revenue reached 2060.5 billion yuan, a year-on-year increase of 6.8%; realized profits and taxes of 147 billion yuan, down 5.6% year-on-year, of which realized profits of 92.2 billion yuan and paid taxes of 54.8 billion yuan. Key private steel companies pay more than 200 yuan per ton of steel; the main reason for the decline in profits and taxes is the large increase in the price of raw materials such as iron ore; the debt ratio of enterprises has dropped from 61.8% last year to 58.2% this year, a decrease of 3.6 percentage points; In general, the operation of private steel has improved, and the main indicators are better than the national average.

　　However, in the economic operation of the steel industry, it is also facing difficulties such as maintaining high raw and fuel prices, rising costs, and falling exports.

　　Third, the steel industry is showing new changes. There are three outstanding changes: 1) The share of crude steel production in the world is increasing, and it was 53% in 2019. This year, under the two-way influence of domestic production increase and foreign production reduction, there will be a greater increase, which is expected to reach about 60%. 2) The full release of steel production capacity driven by strong domestic demand has also strongly supported the rapid recovery of the national economy. It is expected that the annual steel consumption and output will exceed 1 billion tons. 3) The overall image of the steel industry is undergoing positive changes. Over the years, the steel industry has been overwhelmed by the "two highs and one capital" hat, but the steel industry insists on keeping its eyes inward and resolutely implementing the Party Central Committee and the State Council’s recommendations on the supply of steel. The principles and policies of structural reforms and the firm green development concept have achieved remarkable results after long-term efforts, and have been affirmed by relevant national departments. On September 26, the director of the Department of Atmospheric Environment of the Ministry of Ecology and Environment, Liu Bingjiang, in 2020 China Steel The Energy Conservation and Emission Reduction Forum said: During the "13th Five-Year Plan" period, the steel industry has made outstanding contributions to improving the national air quality, and air pollution control has achieved positive results. Although steel production exceeds the planned target, crude steel production has increased year by year, and air pollutants Emissions have increased, but the effect of emission reduction measures has exceeded expectations, offsetting the impact of the increase in steel, and achieving "increased production without increasing pollution"; the iron and steel industry resolves the three major reductions of excess capacity, process emission reduction, and ultra-low emission transformation The effectiveness of emission control measures exceeded expectations.

　　http://www.tjxysteel.com/news/development-of-private-iron-and-steel-economy-1576.html

High Feedback from Vietnam customer

 　　It has been nearly a year since the first cooperation relationship with this customer was established at the beginning of 2020. During one year, the customer has reordered 3 times. Highly recognized Tianjin Xinyue's quality control, resources, and ability to solve problems in a timely manner. There is no smooth sailing order. However, Xinyue relies on its own ability to make every order finally delivered smoothly.

　　The customer comes from Australia and has its own processing plant in Vietnam. After the pipes are processed, they all will be delivery and used in Australian local projects. Therefore, the steel grade has always been required to be high-steel grade C350 Australian steel grade. The biggest difficulty of this order is the specifications required are more than 5 different sizes, but the number of specifications is decades tons. The minimum order quantity for the single specification of the steel grade is generally 200 tons. Xinyue relies on its own experience in this industry in these years, combined with frequently shipped orders in Australia. Solved this big problem for customers. It saved customers a lot of capital occupation fees and the risk of inventory backlog. This month the customer returned Positive feedback was given to us with photos of some of our goods processed in Vietnam. The satisfaction expressed between the lines is enough to become the motivation for our continuous efforts.

　　For Xinyue, problems have always been used to be solved. We face the root of the problem, stand from the perspective of the customer, analyze the problem and solve the problem with the customer's interest as our interest. We Serve the world as Made-in-China.

　　http://www.tjxysteel.com/news/High-Feedback-from-Vietnam-customer-1600.html

Serve wholeheartedly and we can get customer’s trust

 　　The establishment of trust may be long-term and arduous for many people, especially for the foreign trade industry. Today with advanced information, although the authenticity of the company can be checked through Google or Facetime positioning or even the official website of the government, there are still Many customers believe that seeing is believing. Therefore, how to win the trust and favor of customers in the shortest time is a topic that we foreign trade people have always needed to study and explore.

　　The customer mentioned today is from Southeast Asia and is mainly engaged in the construction of hydrocarbon plants. At present, there is a project in hand that urgently needs stainless steel pipe EN10217-7. In the past 4 months, customers have searched all over the world, from UAE to Europe, from Europe to China, and compared more than 20 suppliers. Can't make a decision. Due to the delivery date, the customer finally reached the critical point of project procurement, and finally met Xinyue by chance. After Xinyue knew the customer's project situation and delivery requirements, starting from the inventory plan, it gave the customer a satisfactory delivery date and price, and submitted technical documents and stainless steel factory production photos.

　　Serve wholeheartedly and we can get customer’s trust

　　At the same time, due to the epidemic, customers were unable to visit our company, and a small video was made to show all aspects of Xinyue's office area and factory to give customers peace of mind. Finally, after two weeks of negotiations, the customer assured Xinyue the order.

　　The trust and recognition of customers is the greatest motivation for all Xinyue people, and we will not disappoint any expectations and trust.

　　http://www.tjxysteel.com/news/Serve-wholeheartedly-and-we-can-get-customer-trust-1601.html

Thank customers for trust and exceed customer expectations

 　　An enterprise can develop steadily with attracting new customers and maintaining regular customers. Xinyue has been highly recognized by regular clients with good quality and warm service.

　　The sheet pile is one of our superior products. The exports is keeping increasing this year. No matter price or delivery, Xinyue does its best to control the interests of customers. At the same time, it also helps customers stand out in bidding for various projects, and more and more directly participate in the construction of contractors' projects.

　　This order is from a New Zealand regular customer, which is the same as the previous batch of SP3W SY390. But the customer has added a different length this time, 9 meters and 12 meters. Xinyue provides supply plans such as quotation, delivery date, and shipment as soon as possible, attaches product photos and evaluation report based on market and shipping conditions. After several communications, the details and requirements of the customer’s order were confirmed. The customer expressed a strong intention to cooperate with Xinyue again, and soon confirmed the order with Xinyue.

　　At present, the order has been shipped already.Xinyue upholds the rigorous attitude as always. We have been doing a good job of controlling the details,even if for regular customer . Dimension measurement, product photos, product identification, each process is photographed and kept on file, and finally a report is formed and sent to the customer for review. Customers have highly praised the rigorous attitude and service of the Xinyue team.

　　Build brand with quality, build reputation with service.We will live up to the trust of every customer.

　　http://www.tjxysteel.com/news/exceed-customer-expectations-1626.html

The difference between 2PE anti-corrosion steel pipe and 3PE anti-corrosion steel pipe

 　　3PE anticorrosive steel pipe base materials include seamless steel pipe, spiral steel pipe and straight seam steel pipe. Anti-corrosion pipelines can be divided into two categories, lined with anti-corrosion steel pipes and outer-wall anti-corrosion steel pipes. The lining anti-corrosion mainly includes cement mortar-lined anti-corrosion steel pipe, which has more applications and lower cost. The cement mortar-lined anti-corrosion steel pipe uses the cement mortar anti-corrosion layer to protect the pipeline. Outer wall anti-corrosion pipes are more commonly used 3pe anti-corrosion pipes. The anticorrosion technology is a process of covering the outer wall or inner wall of the steel pipe with a protective effect on the pipeline itself. It can process various pipes such as straight seam steel pipe and spiral steel pipe. Among them, in order to prevent accidents such as personal injury, loss of property, etc. caused by explosion when conveying flammable and toxic fluids, Spiral Steel Pipe Plant adopts corresponding process standards to continuously meet important performance operations, and ensure quality and safety in the market during testing and measurement Use.

　　2PE anti-corrosion steel pipe: two layers of PE anti-corrosion structure for pipelines, the first layer of polyethylene (PE), the second layer of adhesive (AD), the two materials are fused together, and the thickness of each layer is the same as that of three layers of PE.

　　2PE anticorrosive steel pipe advantages:

　　1. Strong corrosion resistance, the construction side is simple and fast, and the service life can reach 30-50 years.

　　2. 2PE anti-corrosion steel pipe has extremely high tightness, long-term operation can greatly save energy, reduce costs and protect the environment.

　　3. At the same time, it has high epoxy strength, low water absorption of PE and good softness of hot melt adhesive, etc., and has high corrosion resistance.

　　4. It also has good corrosion resistance and impact resistance under low temperature conditions, and the water absorption of PE is low (less than 0.01%).

　　https://www.xysteelpipe.com/the-difference-between-2pe-anti-corrosion-steel-pipe-and-3pe-anti-corrosion-steel-pipe/

Quality assurance and prompt delivery

 　　At the beginning of 2020, Xinyue received the inquiry of more than 120 tons of seamless pipe, welded pipe and pipe fittings from its old customers in Singapore. Through the confirmation and submission of a series of technical documents and good price support, As well as the pleasant cooperation of several similar projects in the early stage, the customer did not hesitate to use Xinyue to bid. Soon after, the customer got the project. Because of the impact of the epidemic situation, the construction could not be carried out smoothly. He understood the customer's difficulties. In order to support the customer, Xinyue kept the price valid until the year. The customer was very satisfied with it, and soon after the local epidemic situation improved We confirmed the order.

　　After placing the order, the customer feedback that the terminal project progress is ahead of schedule, which puts forward higher requirements on the delivery date. All production needs to be completed within 20 days. The factory production line order scheduling has been planned in advance, and rash queue jumping may have an impact on other orders. However, in order to protect the interests of customers and meet the terminal requirements, the factory production team immediately adjusts personnel and personnel Under the condition of not affecting the normal delivery of other orders, the production priority was arranged. After 15 days of production and processing, all the production tasks of the order were successfully completed five days in advance.

　　The customer originally planned to come to China for finished product inspection, but due to the epidemic situation, he was unable to visit. After providing the self inspection report, Xinyue arranged for a third party to carry out the inspection. From the size to the appearance to Xinyue inspection report, the third party inspection was very detailed. Xinyue professional technology and production equipment, conscientious operation team, produce strictly in line with ISO quality management system and international production standards and specifications of products. Xinyue always adhere to the concept of "honesty, customer first, high quality and efficiency".

　　This is the best steel pipe brand of Xinyue: "the best price, the best quality, the best delivery time and the best service".

　　Xinyue people sincerely look forward to working with you!

　　Xinyue steel pipe serves the world and builds the world. We are looking forward to your inquiry.

　　http://www.tjxysteel.com/news/Quality-assurance-and-prompt-delivery-1644.html

The Effect and Steps of Seamless Steel Pipe Pickling Passivation

 　　Pickling passivation is a chemical reaction. First, the oxide scale and rust on the surface of the steel can be removed by the pickling solution, and the passivation process can be completed at the same time. It can effectively prevent the seamless steel pipe from oxidizing and achieve the purpose of anti-corrosion. The surface of the seamless steel pipe after pickling passivation becomes uniform silver white, which greatly improves the corrosion resistance of the steel pipe.

　　1. The effect of pickling passivation

　　In the process of prefabrication, welding, testing and heat treatment, iron oxide, welding slag, grease and other dirt will accumulate on the surface of seamless pipes (carbon tubes, stainless steel pipes), which will change the corrosion resistance of the pipes.

　　After the seamless pipe is cleaned by pickling liquid, the stolen goods on the surface of the steel pipe can be removed; after the passivation treatment, a protective film that prevents oxidation can be formed on the surface of the seamless steel pipe, thereby improving the corrosion resistance of the seamless steel pipe and ensuring safe operation of the production process.

　　2. The configuration of pickling solution and passivation solution

　　Whether the passivation solution and the passivation solution are properly formulated or not directly affects the quality of pickling passivation. Therefore, the appropriate formula should be determined according to the nature of the pipe.

　　When the stainless steel pipe or equipment only needs to be pickled on a part of its area, the surface to be treated can be coated with pickling paste after removing the greasy dirt.

　　3. Steps and methods for pickling passivation

　　The pickling purification treatment can be carried out according to the following steps:

　　Degreasing → pickling → cold water rinse → passivation → cold water rinse → blow dry

　　1) Degrease

　　Before pickling, each pipe section should be carefully inspected. If there is grease in the pipe, it should be degreased with carbon tetrachloride (or trichloroethylene). At the same time, check the quality of the weld. If there are large welds, weld slag, etc., they should be dealt with.

　　2) Pickling

　　The pickling can be carried out by tank leaching method or system circulation method. The system circulation method is to use an acid pump to pipe acid liquid into the pipe while exhausting the air. After the air is exhausted, it is circulated until the iron embroidery is thoroughly washed. The pickling time should be increased for pipelines with serious embroidered corrosion (the specific time depends on the actual situation) until all the rust is cleaned. For special-shaped parts that cannot be dynamically pickled, static pickling is used (that is, the special-shaped parts are soaked in an acid tank until the rust is removed).

　　3) Neutralization

　　After the acid is drained, the neutralizing liquid hose on the street uses a pump to dynamically neutralize the remaining acid in the camp. Check with pH test paper at the discharge port, when the solution is neutral or weakly alkaline. That is to stop neutralization.

　　4) Passivation

　　After the pickling is qualified, connect the passivation liquid hose, start the pump to pour the passivation liquid into the tube, and exhaust the air while filling, so that the passivation liquid circulates in the closed for half an hour, and then keep it static for another two hours.

　　5) Blow dry

　　After passivation, first rinse with water, and then use dry oil-free air to completely dry the inner wall of the pipe.

　　https://www.xysteelpipe.com/the-effect-and-steps-of-seamless-steel-pipe-pickling-passivation/

Construction Technology of Pile Driving Spiral Steel Pipe

 　　Piling spiral steel pipe(SSAW) is a spiral seam steel pipe made of strip steel coils as raw materials, often extruded and formed by automatic double-wire double-sided submerged arc welding. So, what is the piling spiral tube like during construction? How is the piling spiral tube produced? The following spiral tube manufacturers will introduce to you.

　　1. Penetration of piling pipe

　　1) Before construction, the control of sample piles should be rechecked one by one according to the original design drawing and the proposed axis line, and the measurement records should be made. Piling construction can only be carried out after the recheck is correct. After the pile-driving spiral pipe pile is transported to the site, it is hoisted with one-point lashing when it is hoisted to the pile position to insert the pile, and the pile-driving spiral pipe pile is aligned with the previously released pile position to ensure that the penetration is accurate and vertical. Before pile driving, a special pile cap must be placed on the pile head, and a hardwood damping pad must be placed on the pile cap. Placed on the top of the pile, it will self-sink, and a large amount of penetration will penetrate into the soil. After it is settled to stability, hammering will be carried out;

　　2) At the beginning of piling, the piling opportunity will be driven empty due to the large penetration. When starting the hammering operation, the test driving should be slowly interrupted until the pile enters a certain depth of the ground, and continuous hammering shall not be allowed. Piling process

　　In the process, the verticality of the guide rod of the pile driver and the pile must be corrected at any time, and the pile hammer, pile cap and pile must be kept on the same longitudinal axis;

　　3) After the pile-driving spiral pipe pile is driven into 1 ~ 2m, the verticality should be re-corrected. When the pile is driven to a certain depth and the quality of the piling is good, then continue to be beaten until it is 60cm~80cm above the water surface to stop the hammering. Connect the piles and repeat the above steps until the design elevation is reached. If the pile position is found to be inclined during the construction process (>1/100L L: steel pile length), it should be adjusted in time or pulled out the steel pipe pile and re-construction;

　　4) The buried depth of pile driving spiral pipe pile: 10m through the riverbed, and the sinking amount within one minute of percussion does not exceed 5mm.

　　2. Connect the pile

　　The pile-driving spiral pipe pile body connection adopts the butt welding of the pile body up and down. Before welding, the deformed and damaged part of the lower pile pipe must be trimmed, and the rust, water or oil sludge sand at the end of the upper pile pipe must be removed and polished.

　　Make good welding joints so that the gap between the upper and lower piles is 2 ~ 4mm. At the same time, multi-layer welding is used. After each layer of welding seam is welded, the welding slag should be removed in time, and the appearance inspection should be carried out.Add welding block to strengthen the connection of the upper and lower piles. After welding, it must be cooled for more than 5 minutes before hammering and piling.

　　3. Welded pile cover

　　After the construction of the pile-driving spiral pipe pile is completed, sand is manually poured into the pile to the top of the pile, and the pile cover is welded on the upper part of the steel pipe pile, and at the same time, 8 to 12 anchor steel bars of 20 mm are welded on the outer wall.

　　Pile driving spiral pipe production process:

　　(1) The raw materials are strip steel coils, welding wires, and fluxes. Strict physical and chemical inspections are required before investment.

　　(2) Butt joint of strip steel head and tail, using single wire or double wire submerged arc welding, after coiling into steel pipe, automatic submerged arc welding is used for repair welding.

　　(3) Before forming, the strip undergoes leveling, edge trimming, edge planing, surface cleaning and conveying, and pre-bending treatment.

　　(4) The electric contact force meter is used to control the pressure of the cylinders on both sides of the conveyor to ensure the smooth conveying of the strip.

　　(5) Externally controlled or internally controlled roller molding is adopted.

　　(6) The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the weld gap are all strictly controlled.

　　(7) Both internal welding and external welding adopt American Lincoln electric welding machine for single-wire or double-wire submerged arc welding, so as to obtain stable welding quality.

　　(8) The welded seams are all inspected by the online continuous ultrasonic automatic flaw instrument, which guarantees 100% non-destructive testing coverage of the spiral welds. If there is a defect, it will automatically alarm and spray the mark, and the production workers will adjust the process parameters at any time according to this to eliminate the defect in time.

　　(9) Use an air plasma cutting machine to cut the steel pipe into individual pieces.

　　(10) After cutting into a single steel pipe, each batch of steel pipes must undergo a strict first inspection system to check the mechanical properties, chemical composition, melting condition of the weld, the surface quality of the steel pipe and the non-destructive inspection to ensure that the pipe manufacturing process is qualified. Only later can it be officially put into production.

　　(11) The parts with continuous sonic flaw detection marks on the welds are re-examined by manual ultrasonic and X-ray.

　　eliminate.

　　(12) The pipes where the butt-welded seams of Fe-steel and the J-joint intersecting with the spiral welds are all inspected by X-ray television or filming.

　　(13) Each steel pipe undergoes a hydrostatic pressure test, and the force adopts a radial seal. The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device. The test parameters are automatically printed and recorded.

　　(14) The pipe end is machined to accurately control the verticality of the end face, the bevel angle and the obtuse edg.

　　https://www.xysteelpipe.com/construction-technology-of-pile-driving-spiral-steel-pipe/

Continuous improvement of refractory product variety and structure

 　　The technological development of the high-temperature industry has stimulated the research and development of refractory materials, and the product variety and structure have been continuously improved.

　　In the early days of the founding of the People’s Republic of China, my country’s steel industry basically adopted open-hearth smelting technology and die-casting production processes, resulting in low production efficiency and high energy consumption.

　　Since the 1990s, the application of the "flat conversion, full continuous casting and secondary refining" technology in the iron and steel industry has been an important symbol of the progress of iron and steel smelting technology.

　　——With the development of intensified smelting technology, some steel plants built some steel-making converters in the early 1970s, but the main body was still open-hearth steelmaking. At that time, refractories did "drag" the iron and steel industry. After Baosteel's first phase was put into production, the converter was lined with magnesia-carbon bricks, and the initial furnace age was about 2000 furnaces. The highest furnace age before slag splashing protection was 3800 furnaces. After the slag splashing protection technology was adopted, the furnace age was greatly improved. Since then, the magnesia carbon brick production technology has been promoted nationwide, and the production capacity has increased rapidly, ensuring the production demand of the iron and steel industry.

　　——The continuous casting ratio has increased rapidly, which has promoted the technological progress of refractory materials. In the early 1990s, my country's steelmaking and continuous casting were relatively low, and in 1990 it was only 22.3% (mainly Baosteel and Anshan Iron and Steel), and then rose rapidly, reaching 85.3% in 2000 and over 98% in 2008.

　　In order to ensure the supporting of Baosteel's second phase project and Anshan Iron and Steel project, the Ministry of Metallurgical Industry approved the expansion project of the aluminum-carbon workshop of Qingdao Refractory Plant to introduce foreign technology in order to realize the localization of the three major aluminum-carbon parts. The project was officially put into production on September 9, 1990, when the actual output of the three major aluminum-carbon pieces in the country was less than 1,000 tons. After that, the three major manufacturers increased rapidly, and their production capacity and output increased rapidly.

　　By 2000, there will be about 20 domestic three-part manufacturers with an output of more than 30,000 tons. By 2019, there will be about 60 three-part (including sizing nozzles) manufacturers (including wholly foreign-owned and joint ventures). Nearly 300,000 tons, and the output in 2020 will be more than 230,000 tons.

　　——With the continuous adjustment of the structure of steel varieties and the continuous increase of the proportion of varieties of steel, the technology of out-of-furnace refining is rapidly being widely used in the steel industry. In the early 1990s, the refractories used for refining outside the furnace in my country's steel industry also mainly relied on imports. With the joint efforts of refractory manufacturers and the majority of refractory science and technology personnel, the process of localization has been accelerated through introduction, digestion, transplantation and innovation. So far, domestically produced refractories for refining outside the furnace can fully meet the needs of users.

　　——In addition to the iron and steel industry, technological advancements in cement, glass, non-ferrous metal smelting, chemical, electric power, ceramics and other industries have also put forward new requirements for the variety and quality of refractory materials. Through the joint efforts of the majority of engineering and technical personnel in the industry, the domestically produced refractory products have a complete variety and stable quality, which can fully guarantee the production and operation of the domestic high-temperature industry.

　　http://www.tjxysteel.com/news/improvement-refractory-product-variety-and-structure-1850.html

Smooth delivery of bridge steel pipe

 　　For many years, Xinyue has remained at the forefront of the industry, stood out in many competitions, and became the unswerving choice of customers. What Xinyue does is to ensure quality, control delivery and package consignment. A series of details are handled and the attitude of serving customers attentively.

　　In mid-May, the Philippines customer placed an order of steel pipes for bridge construction , which is 8 containers. In mid-June, the goods were successfully produced in accordance with customer requirements.

　　Due to the impact of COVID 19, the international logistics capacity has dropped sharply, causing ocean freight increase too much. Moreover, due to congestion in many foreign ports,the export is contraction, containers cannot return to China as planned. the shipping space is rather difficult to book. Under the complex foreign trade situation, We have the strong logistics system to overcome the difficulties caused by the shortage of containers and the skyrocketing freight rate. All the material will be shipped at the end of June as scheduled and shipped to Manila ports to support Philipines’s infrastructure construction.

　　In order to avoid any damage to container loading steel pipe during the shipping process, we have strengthened the packing of this cargo. One steel pipe and one container, 2 meters apart, the two side of pipe body are fixed with wooden piles, and steel wire ropes are reinforced every two meters to ensure that the goods cannot roll during transportation. All the photos of the reinforced packing were sent to the customer for confirmation, and the customer highly recognized the high-quality products and professional services provided by Xinyue.

　　Xinyue Steel Group values every client, focus on every item & every details to offer the best service to our clients, build the most superior brand of “XINYUE”

　　http://www.tjxysteel.com/news/Smooth-delivery-of-bridge-steel-pipe-1877.html

Causes of Wrong Edges of Large-diameter Spiral Steel Pipes

 　　Causes of wrong edges of large-diameter spiral steel pipes (SSAW):

　　In the production of large-diameter spiral steel pipes, misalignment occurs from time to time, and there are many influencing factors. In production practice, steel pipes are often degraded due to dry misalignment and out-of-tolerance. Therefore, it is necessary to analyze the causes of wrong edges of large-diameter spiral steel pipes and preventive measures.

　　1. The sickle bend of the steel belt is the most important factor causing the wrong edge of the steel pipe.

　　In the forming of spiral welded pipes, the sickle bend of the steel strip will continuously change the forming angle, resulting in the change of the weld gap, resulting in seams, staggered edges and even overlapping edges. The quality of the steel pipe is seriously affected. Therefore, observe the sickle bend of the steel strip after uncoiling. By controlling the vertical roll, the disc shear can cut off part of the sickle bend. The continuous control and correction of the forming angle are to reduce the sickle bend of the steel strip during the production process. An effective way to produce wrong sides.

　　2. Due to the poor shape and dimensional accuracy of the head and tail of the untrimmed steel strip, it is easy to cause the steel strip to bend hard and cause the wrong side to be caused by the butt joint.

　　3. When the reinforcement of the welding seam of the head and tail butt welding of the steel strip is large, if the over-forming is not handled properly, it is easy to cause a large misalignment.

　　4. The poor condition of the edge of the steel strip is another important reason for the wrong edge.

　　https://www.xysteelpipe.com/causes-of-wrong-edges-of-large-diameter-spiral-steel-pipes/

How to Choose Stainless Steel Seamless Pipe and Welded Pipe?

 　　Seamless steel pipes are much higher than welded pipes in terms of corrosion resistance and pressure and high temperature resistance. With the improvement of welded pipe manufacturing process, mechanical properties and mechanical properties are gradually approaching seamless pipes. The production process of seamless pipe is more complicated, and its price is more expensive than welded pipe.

　　Based on the characteristics and differences of stainless steel seamless pipes and welded pipes, reasonable choices should be made during application to achieve economical, beautiful and reliable effects:

　　1. When used as decorative pipes, product pipes, and prop pipes, generally good surface effects are required, and stainless steel welded pipes are usually used;

　　2. For generally lower pressure fluid transportation, such as low pressure systems such as water, oil, gas, air, and heating hot water or steam, stainless steel welded pipes are usually used;

　　3. For pipelines used in industrial engineering and large-scale equipment to transport fluids, as well as pipelines that require high temperature, high pressure, and high strength on power plants and nuclear power plant boilers, stainless steel seamless pipes should be used;

　　4. Stainless steel welded pipes are generally used for liquid transportation below 0.8MPa, and seamless pipes can be used for liquid transportation above 0.8MPa. If the pressure requirements are not high, it will be more economical to use welded pipes.

　　https://www.xysteelpipe.com/how-to-choose-stainless-steel-seamless-pipe-and-welded-pipe/

Problems and Defects of ERW Steel Pipe

 　　The problems and defects of ERW steel pipes are related to raw materials, production methods, process conditions, equipment status and personnel. Product defects that occur in the production process due to the above factors and restrictions.

　　This kind of product defects can be roughly divided into two categories: one is product defects, that is, the defects in the product itself are inconsistent with the product standards; the first type of defects generated during the production process does not form the requirements of the product standard items, but is also the product quality The problem, its development trend will inevitably lead to product defects. Therefore, such defects are not allowed in the production process.

　　Process defects

　　No burr: burr welds. Outer burr is generally better when the watertight test water pressure. But for Ling, bending, flattening test, weld most cracking.

　　Peach tip: weld at no glitches, and recessed within the wall, forming the tip shape of peaches, try water pressure when water-tight. But bending, flattening test, weld multiple cracking. Within the burr unilateral: watertight seam burr for the side extrusion test water pressure. Bending, flattening test, sometimes cracking.

　　Burnt: the outer surface of small pits in the weld, welding sparks a lot of splash, the microstructure observed small holes watertight when the test water pressure, bending, flattening test, most will not crack, but the impact on the intensity of use and life expectancy.

　　Weld defects

　　Opening: straight weld plate edge face melting traces or melting traces without welding, crack two tip along the weld direction, expansion, penetrate the inner surface of the test water pressure, leaking.

　　Crack: micro-crack crack; the outer surface of the visible appearance of fine lines, the inner surface of intact, no leakage in the test water pressure, but when crushed or cold-formed crack.

　　Lap welding: two edge dislocation in the welding, scraping, except burrs can still see the obvious one side higher and exceed the wall thickness of the negative deviation.

　　Surface defects

　　Scratch: the general was the axis of the straight channels and scratches, deeper than the wall thickness of the negative deviation of scrap defects in the weld on both sides of a continuous nail-shaped scratch. Super wall thickness of the negative deviation. Waste big flaw.

　　Correction hurt: the leveler spiral crushed obviously feel more than the wall thickness of the negative bias of – waste defect.

　　Pockmarked face: the tube surface successful piece punctate small pits with a diameter of about 1mm.

　　Warp: the pipe surface warping the separation of the part and the metal substrate into pieces, not continuous, spalling can not afford.

　　https://www.xysteelpipe.com/problems-and-defects-of-erw-steel-pipe/

How to Remedy the Rusty Seamless Steel Pipe?

 　　Long-term storage of seamless steel pipes in sales shops may cause some rust problems. If the seamless steel pipe is rusty, it is not easy to sell. So how can we remedy the rust of the seamless steel pipe? Let’s take a look together.

　　1. Tools for rust removal: mainly use wire brushes and other tools to polish the surface of seamless steel pipes, which can remove loose or warped oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach the Sa2 level, and the power tools can reach the Sa3 level.

　　2. Pickling: Generally, two methods of chemical and electrolysis are used for pickling. Pipeline anticorrosion only uses chemical pickling, which can remove oxide scale, rust, and old coatings. Sometimes it can be used as a reprocessing after sandblasting and rust removal. Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, its anchor pattern is shallow and it is easy to pollute the environment.

　　3. Spray (throwing) rust removal: The spray rust removal is to drive the spray blades to rotate at a high speed through a high-power motor, so that steel grit, steel shot, iron wire segments, minerals and other abrasives are sprayed on the surface of the steel pipe under the action of centrifugal force. It can completely remove rust, oxide and dirt, and the seamless steel pipe can achieve the required uniform roughness under the action of the violent impact and friction of the abrasive. After spraying to remove rust, not only can the physical adsorption of the pipe surface be expanded, but also the mechanical adhesion of the anti-corrosion layer and the pipe surface can be enhanced. Therefore, spray rust removal is an ideal rust removal method for pipeline anticorrosion. Generally speaking, sand blasting and rust removal are mainly used for the inner surface treatment of pipes, and sand blasting and rust removal are mainly used for the outer surface treatment of pipes.

　　4. Cleaning: Use solvent (character: transparent, colorless liquid) and emulsion to clean the surface of seamless steel pipe to remove oil, grease, dust, lubricant and similar organic matter, but it cannot remove the rust on the surface of seamless steel pipe. , Oxide scale, welding flux, etc., so it is only used as an auxiliary means in anti-corrosion production.

　　https://www.xysteelpipe.com/how-to-remedy-the-rusty-seamless-steel-pipe/

Russian customers sign a new contract with full payment

 　　Trust creates long-term cooperation. Long-term cooperation creates a tacit understanding of business. In July, Xinyue once again signed a new fastener contract with the customer, although the contract stated that the payment term was 30% deposit, and 70% of the payment was paid before delivery. , But the customer still chose to pay all the purchase price to Xinyue before the reproduction. The moment I received the customer's order, I was deeply moved, and more of the customer's trust gave us a sense of accomplishment.

　　Russian fastener customers have been cooperating with Xinyue for 5 years. In the past five years, Xinyue has sent customers dozens of batches of goods. In the past five years, Xinyue has not received even one customer’s product quality and Questions about service. In the past five years, in China, which is known as the "world's largest factory", customers have been determined to choose Xinyue.

　　The product specifications this time are mainly forged scaffold rotation and right-angle fasteners. The size is 48mmx60mm. This specification is not a specification for the customer’s long-term cooperation with Xinyue. However, after receiving Xinyue’s quotation, there is still no bargaining, so let the Xinyue drew up the contract and informed the estimated payment time. There was no hesitation in the price because the customer knew that Xinyue gave the best price support every time. There was no doubt about the delivery date because the customer passed countless times Cooperation, we already know Xinyue's production and supply capabilities.

　　Long-term cooperation requires mutual trust and mutual support. Xinyue not only gains the trust of customers, but also provides full support when customers need it most. Several times, when customers encounter financial difficulties, Xinyue helps with the lowest fixed amount The customer started production. Once several times, because of the final payment problem, Xinyue helped the customer to store the products for free for several months. Once several times, when the customer needed to break through the local market and new customers, Xinyue gave strong technology and samples support.

　　Five years is just a short timeline.I believe that Xinyue's services and products can make this timeline longer and longer.

　　http://www.tjxysteel.com/news/Russian-customers-sign-a-new-contract-with-payment-1887.html

To live up to the task and have a long way to go

 　　Tianjin Xinyue team fully cooperate with customers and third parties in 2600 tons anti-corrosion pile pipe project in South America, and from leadership to quality control, it makes every effort to cooperate with the third party inspection, and each production is strictly in accordance with the standard. The third party shall supervise the whole process, from raw materials to anti-corrosive products to port, and the third party shall pass 100% full inspection and pass the signature before the next step can be pushed forward. From the raw material physical and chemical inspection, dimension checking, UT inspection, welding record and corrosion protection sand blasting level 2.5, anti-corrosion inspection are strictly in accordance with ITP, even higher than the production standard, but Tianjin Xinyue can meet the requirements of customers and meet the requirements of customers. At the same time, Tianjin Xinyue has learned the spirit of perseverance and excellence from customers through this project.

　　According to the original contract plan, November bulk carriers are scheduled. However, due to the outbreak of global epidemic, the original scheduled bulk carrier changes its sailing schedule and does not leave for Tianjin port. In order to meet the urgent demand of the project site, Xinyue exchanges high prices for other cargo ships, so as to catch up with the customer's delivery schedule. However, affected by the epidemic again, the crew on the cargo ship went on strike. In addition to the new cases in China, many ports refused to exchange crew members. Fortunately, after changing crew members, everything began to go smoothly. According to the actual situation, Tianjin Port was heavily under pressure, and many bulk carriers were waiting at the anchorage for 10 days and a half months, which was normal. Due to the customer's urgent project, Tianjin Xinyue's Logistics Department Actively communicate and cooperate with forwarders and shipowners for many times, and must berth and load immediately.

　　Tianjin Xinyue has rich experience in operation of project list. We believe that the team is not afraid of difficulties, perfect to overcome every link of the problem. From the third party, it is required to conduct 100% UT test at the weld of each steel pipe, and it is required to wait 24 hours for cooling before UT test. Every link is carried out in strict accordance with ITP, from steel pipe production to anti-corrosion, shipping and port loading, the third party is in the whole process, and customers are involved in the whole process.

　　Xinyue actively cooperates with the third party to inspect every production link. Although it is hard in the process, it has been recognized by professional TUV inspectors and satisfied by customers. Everything is worth it.

　　At the same time, Tianjin Xinyue technical team and document team actively cooperated with customers to make project documents, and completed the most comprehensive pile pipe project documents in Xinyue's history, with more than 2000 pages of project documents.

　　At the beginning of February, the customer flew to Xinyue Changsha branch to make a project summary, and the customer put forward many valuable opinions. At the same time, through this cooperation, Xinyue and the customer have established a deeper understanding and cooperation. I believe that through this project operation, it has done a strong foundation for the follow-up new projects.

　　In early March, the bulk vessel successfully arrived at the port of destination, and the steel pipe was directly unloaded to the barge designated by the customer at the port of destination. Xinyue has rich experience in the operation of bulk carrier's main management, requiring that the cooperative bulk carrier must have unloading equipment and professional operators. At the same time, because of the difficulty and long time of unloading operation due to the epidemic situation, Xinyue considered the unloading time of 5 days in advance in order to save the cost of customers. I believe that through this cooperation, the customers are very sure of Xinyue's operation ability, believe that this is only the beginning of a project, and look forward to a steady stream of new projects in 2021.

　　http://www.tjxysteel.com/news/To-live-up-to-the-task-and-go-long-way-1754.html

Seamless Steel Pipe for Bearings

 　　Bearing seamless steel pipes are also called high-carbon chromium seamless steel pipes. The carbon content Wc is about 1%, and the chromium content Wcr is 0.5%-1.65%. Bearing seamless steel tubes are divided into six types: high-carbon chromium bearing seamless steel tubes, chromium-free bearing seamless steel tubes, carburized bearing seamless steel tubes, stainless bearing seamless steel tubes, medium and high temperature bearing seamless steel tubes, and antimagnetic bearing seamless steel tubes.

　　High-carbon chromium bearing seamless steel pipe GCr15 is the world’s largest production of bearing seamless steel pipe. The carbon content Wc is about 1%, and the chromium content Wcr is about 1.5%. Since its birth in 1901, it has basically no main components for more than 100 years. Change, with the progress of science and technology, research work continues, product quality continues to improve, accounting for more than 80% of the world's total production of seamless bearing steel pipes. So if there is no special description for bearing seamless steel pipe, it refers to GCr15.

　　Bearing seamless steel tubes are steel used to make balls, rollers and bearing rings. Bearing seamless steel pipes have high and uniform hardness and wear resistance, as well as high elastic limit. The requirements for the uniformity of the chemical composition of the bearing seamless steel pipe, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict. It is one of the most stringent steel grades in all steel production.

　　In order to meet the above requirements for the performance of dynamic bearings, the following basic performance requirements are proposed for bearing seamless steel pipe materials:

　　1) High contact fatigue strength

　　2) After heat treatment, it should have a high hardness or a hardness that can meet the performance requirements of the bearing

　　3) High wear resistance, low friction coefficient

　　4) High elastic limit

　　5) Good impact toughness and fracture toughness

　　6) Good dimensional stability

　　7) Good anti-rust performance

　　8) Good cold and hot processing performance

　　Main standards for bearing steel pipe:

　　ASTM A 295: wearable high-carbon bearing steel pipe

　　ASTM A 534: wearable and cementite bearing seamless steel pipe

　　JIS G 4805: high-carbon chromium bearing seamless steel pipe

　　DIN 17230: ball bearing steel pipe

　　NF A 35-565: steel product

　　Steel grades of bearing steel Pipe:GCr15 (52100, SUJ2, SUJ3, 100Cr6, SKF3, SKF3S), 20CrNiMo (8620H, 4118H).

　　http://www.xysteelpipe.com/info/Seamless-Steel-Pipe-for-Bearings-1988-1.htm

Production technology of straight seam welded pipe

 　　Straight seam welded pipes, steel pipes made of hot-rolled or cold-rolled steel plates or steel strip coils welded on welding equipment, are all called straight seam welded pipes. (The name is given because the welds of the steel pipe are in a straight line).

　　Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. Straight seam steel pipes can be divided into high-frequency straight seam steel pipes (ERW tube) and submerged arc welded straight seam steel pipes (LSAW tube) according to the production process. Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development.

　　Description of the main production process of large diameter straight seam welded pipe:

　　1. Plate inspection: After the steel plate used to manufacture the large-diameter submerged arc welded straight seam steel pipe enters the production line, the full plate ultrasonic inspection is first carried out;

　　2. Edge milling: double-sided milling of the two edges of the steel plate by a milling machine to achieve the required plate width, plate edge parallelism and bevel shape;

　　3. Pre-bending: Use a pre-bending machine to pre-bend the edge of the board so that the edge of the board has a curvature that meets the requirements;

　　4. Forming: On the JCO forming machine, first half of the pre-bent steel plate is pressed into a "J" shape through multiple stepping steps, and then the other half of the steel plate is also bent and pressed into a "C" shape, and finally an opening is formed "O" shape

　　5. Pre-welding: Join the formed longitudinally welded steel pipes and use gas shielded welding (MAG) for continuous welding;

　　6. Internal welding: use longitudinal multi-wire submerged arc welding (up to four wires) to weld on the inner side of the straight seam steel pipe;

　　7. External welding: use longitudinal multi-wire submerged arc welding to weld on the outside of the longitudinal submerged arc welded steel pipe;

　　8. Ultrasonic inspection I: 100% inspection of the inner and outer welds of the longitudinally welded steel pipe and the base materials on both sides of the weld;

　　9. X-ray inspection I: 100% X-ray industrial TV inspection of the inner and outer welds, using an image processing system to ensure the sensitivity of flaw detection;

　　10. Diameter expansion: expand the total length of the submerged arc welded straight seam steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution of the internal stress of the steel pipe;

　　11. Hydraulic test: The expanded steel pipes are inspected one by one on the hydraulic testing machine to ensure that the steel pipe meets the test pressure required by the standard. The machine has automatic recording and storage functions;

　　12. Chamfering: Process the pipe ends of the steel pipes that have passed the inspection to meet the required pipe end groove size;

　　13. Ultrasonic inspection Ⅱ: Perform ultrasonic inspection again one by one to check the possible defects of the longitudinally welded steel pipe after the diameter expansion and water pressure;

　　14. X-ray inspection Ⅱ: X-ray industrial television inspection and pipe end weld filming of the steel pipe after the expansion and hydraulic test;

　　15. Tube end magnetic particle inspection: carry out this inspection to find tube end defects;

　　16. Anti-corrosion and coating: Qualified steel pipes are anti-corrosion and coating according to user requirements.

　　http://www.xysteelpipe.com/info/Production-technology-of-straight-seam-welded-pipe-1895-1.htm

Casing Pipe Quality Control Procedure

 　　1. In order to ensure that the original and auxiliary materials used are qualified products, the company evaluates and selects qualified suppliers according to GB/T19001-2000-ISO9001:2000 and API standards. Inspected by the raw material inspector of the Quality Management Department, unqualified raw materials and accessories may not be put into use.

　　2. Casing pipe diameter test: This test is used to detect the straightness of the pipe body and detect whether there is a bump in the pipe wall.

　　3, Quality inspection is for the finished product testing, quality inspection staff need to check to ensure that the product has no obvious defects and all the tubes are in compliance with the required parameters and length.

　　4. Tubing collar size and appearance inspection: QC staff inspects the size and surface of the steel pipe to ensure compliance.

　　5. Hydrostatic test: The pipe body will be rolled into the hydrostatic tester and water will be injected into the pipe body to ensure that the pipe body can withstand the internal water pressure and ensure that the pipe body does not leak.

　　6. Physical and chemical analysis of casing collar: This test is used to analyze the chemical composition, mechanical properties, and metal structure of the raw materials in the pipe.

　　7. Casing pipe thread test: The production personnel will physically inspect the thread after the yarn stage in the production process to ensure compliance.

　　http://www.xysteelpipe.com/info/Casing-Pipe-Quality-Control-Procedure-1896-1.htm

Special Thread for API Casing Pipe

 　　API casing threads are not suitable for the development of high-pressure gas fields, so many manufacturers have developed special joints with their own characteristics. Among them, the gas-sealed special joint thread types suitable for the development of gas fields are:

　　1. NS-CC thread (developed by Nippon Steel), its main features are:

　　1.1 The thread adopts improved API partial trapezoidal thread. High tensile strength of the joint;

　　1.2 Cone surface and cone surface metal main seal and inner shoulder metal secondary seal, so that the joint has good air tightness;

　　1.3 The stepped double straight shoulder structure makes the joint have good anti-torsion and bending ability, and is beneficial to protect the main seal;

　　1.4 The circumferential stress on the joint is lower, which helps prevent stress corrosion cracking.

　　2. Fox thread (co-developed by Kawasaki Steel in Japan and Hunting in the UK).

　　3. TM thread (Japan Sumitomo Metal's improved design based on VAM thread)

　　4. SEC thread (designed and produced by Siderca, Argentina)

　　http://www.xysteelpipe.com/info/Special-Thread-for-API-Casing-Pipe-1897-1.htm

Why does Hot-dip Galvanized Seamless Steel Pipe Cause Chromatic Aberration?

 　　Why does hot-dip galvanized seamless steel pipe cause chromatic aberration?

　　Mainly due to the violent reaction of iron and zinc. The violent reaction of Fe-Zn makes the original complete coating composed of alloy layer and pure zinc layer become the phenomenon of only alloy layer and no pure zinc layer. Gray or dark gray is the color of iron-zinc alloy. In addition, if the quality of the zinc solution deteriorates, the iron content in the zinc solution will increase, and the pure zinc layer on the surface after galvanizing will appear gray due to iron content, causing color difference.

　　Specific reasons:

　　(1) The material of the plated parts contains more elements such as carbon, silicon, sulfur, and phosphorus. The electrochemical reaction between iron and zinc is due to the inert electrode formed by this type of element, and the relative potential becomes higher, which causes the iron and zinc reaction to intensify.

　　(2)The content of aluminum and other metal elements in the zinc solution is too small, and for active steel and other materials galvanizing, the iron-zinc reaction cannot be effectively inhibited.

　　(3) The increase in iron content in the zinc liquid deteriorates the quality of the zinc liquid.

　　Improvement measures:

　　⑴ According to the material, choose the appropriate galvanizing temperature;

　　⑵ Adjust the composition of zinc liquid to control the content of aluminum and nickel in an appropriate range;

　　⑶ Shorten the zinc immersion time as much as possible;

　　⑷ After being out of the pot, add water as soon as possible to cool down.

　　⑸ Purify the zinc liquid in time to ensure the quality of the zinc liquid.

　　http://www.xysteelpipe.com/info/Why-does-Hot-dip-Galvanized-Seamless-Steel-Pipe-Cause-Chromatic-Aberration-1987-1.htm

How to Carry Out the Pickling Process of Seamless Steel Tube？

 　　In the rolling process of seamless steel pipes, especially precision seamless steel pipes, the pickling process is very important to remove the oxide scale and rust on the surface. How is pickling performed?

　　The method of using acid solution to remove oxide scale and rust on the surface of steel is called pickling. Iron oxides such as scale and rust (Fe3O4, Fe2O3, FeO, etc.) react chemically with the acid solution to form salts that are dissolved in the acid solution and removed. Acids for pickling include sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and mixed acids.

　　Commonly used media for pickling of precision seamless steel pipes:

　　Sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid. When pickling, be sure to add a pickling corrosion inhibitor to prevent the acid from corroding the metal.

　　Pickling process of precision seamless steel pipe:

　　There are mainly immersion pickling method, spray pickling method and acid paste derusting method. Generally, the dipping and pickling method is generally used, and the spray method can be used in mass production. Steel parts are generally pickled in a 10%-20% (volume) sulfuric acid solution at a temperature of 40°C. When the iron content in the solution exceeds 80g/L and ferrous sulfate exceeds 215g/L, the pickling solution should be replaced. At room temperature, the steel is pickled with 20% to 80% (volume) hydrochloric acid solution to prevent over-corrosion and hydrogen embrittlement. Since acid has a great corrosive effect on metals, corrosion inhibitors need to be added. After cleaning, the metal surface becomes silvery white, and at the same time, the surface is passivated to improve the corrosion resistance of stainless steel.

　　In order to eliminate the adsorption on the surface of the diatomaceous earth carrier and reduce the tailing of the chromatographic peak, the carrier needs to be acid washed or alkali washed before use. Pickling is to soak the carrier with 6mol/L hydrochloric acid for 2 hours or heat and soak with concentrated hydrochloric acid for 30 minutes, filter, wash with water to neutrality, and dry. Pickling can remove iron, aluminum, calcium, magnesium and other impurities on the surface, but cannot remove silanol groups. The pickling carrier is suitable for the analysis of acidic samples.

　　The role of precision seamless steel pipe pickling:

　　Degreasing and derusting the surface of precision seamless steel pipes to prepare for the next process. In the production process, the pickling process is to remove the surface oxide scale, and then go through lubrication treatment (carbon steel-phosphorous saponification, stainless steel-butter lime, copper aluminum pipe-oiling), using the old process-copper plating), and then For drawing and deep processing. If the steel pipe is not pickled, there may be oxides and oil stains on the surface, and the nuclear energy of the phosphating solution cannot remove them, and the quality of phosphating will be reduced.

　　http://www.xysteelpipe.com/info/How-to-Carry-Out-the-Pickling-Process-of-Seamless-Steel-Tube%EF%BC%9F-1984-1.htm