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