Xinyue receives new orders from Middle East customers who have cooperated for eight years

 In early April 2019, Xinyue Steel once again received an inquiry from an old customer in the Middle East: a 450-ton rectangular tube. Since the customer signed the first contract with Xinyue in 2011, the two parties have maintained good cooperation. After communicating with the customer the relevant details of the project and the time of arrival at the construction site. Xinyue quickly gave the best offer. Two days later, Xinyue team received a reply from the customer: In this order,we want 90 days forward LC payment term.

Based on the eight-year cooperation between the two parties, the team decided to accept the customer's 90-day forward LC payment. We hope that through this transaction, the two sides will establish closer trade and reach a new height on the basis of cooperation. After confirming various contract details with the customer, Xinyue started production in strict accordance with the standards and requirements provided by the customer. At the beginning of June, Through the inspection results of the third-party organization appointed by the customer, Xinyue gave the customer a perfect answer to the tolerance control of the rectangular tube, the chemical composition and the mechanical performance.

At present, some products have been successfully shipped to the Middle East. With professional products and excellent service, Xinyue has made every new customer become our old customer, let every old customer always trusts our company. Xinyue people have always adhered to the concept of "building the world, serving the world", and always consider for customers, to support our customers to the maximum extent, mutual benefit and win-win. This is one of the reasons why we have won the trust of many customers.

http://www.tjxysteel.com/news/Xinyue-receives-new-orders-from-Middle-East-customers-938.html

Common internal and external surface defects of seamless steel tubes

 Common defects of seamless steel pipes can be divided into two categories: external surface defects and internal surface defects.

1. External surface defects

(1) Folding defects are irregularly distributed.

Macroscopic features: If there is mold residue left on the surface of the continuous casting billet, the outer surface of the rolled tube will have deep folds.There are stacking defects, and they are distributed longitudinally, and there will be a blockage phenomenon in some parts of the surface, and dark gray blocks will be exposed at the part where the blockage occurs.

Microscopic features: The folding depth of the rolled tube is about 0.5 ~ 1mm, and the folding direction of the distribution is 40°~60°.

(2) Longitudinal distribution of large folding defects.

Macroscopic features: Crack defects and large folding defects appear on the surface of the continuous casting billet, and they are distributed longitudinally.

Microscopic features: Most of the folds on the surface of the seamless steel pipe are about 1 ~ 10mm deep, and the folds contain iron oxide. There are no other defects around and in the middle of the folds, and there is serious oxidation and decarburization around the folds.

(3) Small crack defects.

Macroscopic characteristics: There are surface defects on the outer wall of the pipe body that cannot be observed with the naked eye when the seamless steel pipe is inspected.

Microscopic features: There are many small folding defects on the surface of the seamless steel pipe, the deepest depth is about 0.15mm, the surface of the seamless steel pipe is covered with a layer of iron oxide, and there is a decarburization layer under the iron oxide, with a depth of about 0.2mm.

(4) Linear defects.

Macroscopic features: There are linear defects on the outer surface of the seamless steel pipe, and the specific features are shallow depth, wide opening, visible bottom, and certain width.

Microscopic Features: The visible depth of the outer wall of the cross-section of the seamless steel pipe.

2. Internal surface defects

(1) Convex hull defects.

Macroscopic features: There are randomly distributed longitudinal small convex hull defects on the inner wall of the seamless steel pipe, and the height of these small convex hull defects is about 0.2mm~ 1mm.

Microscopic features: There are chain-like black-gray inclusions at the tail, middle and surrounding sides of the inner wall convex hull of the cross-section of the seamless steel pipe. This type of black-gray chain contains calcium aluminate and few complex oxides (iron oxide, silicon oxide, magnesium oxide).

(2) Straight defects.

Macroscopic features: The seamless steel pipe has straight-shaped defects with a certain depth and width, similar to scratches.

Microscopic features: The scratches on the inner wall of the cross-section of the seamless steel pipe are in the shape of grooves with a depth of 1~2cm. The oxidation and decarburization of the groove edges does not appear. The structure around the grooves has metal rheology and deformation extrusion characteristics. The bottom of the grooves is usually There will be micro-cracks due to sizing extrusion during the sizing process.

https://www.xysteelpipe.com/common-internal-and-external-surface-defects-of-seamless-steel-tubes/

Successfully Delivery of Middle East Water Pipeline Project

 At the end of February 2019, Xinyue received an inquiry from customer about water pipe projects. They needed seamless steel pipe with internal and external coating. After a series of technical confirmation, the customer gave us the order at the beginning of March. This customer has strict quality requirements, so he entrusted BV third-party inspection organization to supervise the whole process of steel pipe production and coating production.

It took nearly three months. At the end of June we arranged shipment after the third party inspection , our pipe 100% qualified shipped again . Although there were some problems in the production process, but Xinyue steel never avoid our responsibility and positively to solve all the issues. Finally we overcome a series of difficulties and succeeded in delivery with the support of the factory and technical team, In the near future, customers will receive qualified steel pipes and used for the project, and we will continue to follow up.

Every steps of efforts is worthy, it means that we Xinyue is always on our way to build the world, serve the globe , and we always try our best to serve every customers.

http://www.tjxysteel.com/news/Delivery-of-Middle-East-Water-Pipeline-Project-942.html

Malaysia pipe fittings completion

 As a professional supplier of pipes and fittings, Tianjin Xinyue Iron & Steel Group has been committed to global infrastructure projects for the past ten years. It has close cooperation with the world's top contractors and maintains good interaction during the cooperation. Professional technical support and quality service.

In February of this year, we received a number of more than 160 pipe fittings inquiries from local professional plumbing parts suppliers in Malaysia. After receiving the inquiry and customer technical requirements, the letter technology team immediately made a technical assessment. And immediately calculated the cost price, and reported the price to the customer the next day. Since the order reached the final bidding stage, the end customer gave a target price. In view of this is the first cooperation with the customer, the letter management team decided to give the customer the best price under the premise of guaranteeing the quality.

Before the order was confirmed, the customer negotiated and met all the technical requirements, and provided the ITP, MPS, and the customer confirmed the order after the terminal engineer passed the audit. Subsequent packaging and processing procedures, marking and color coding procedures, rust prevention measures, water pressure procedures, galvanizing procedures, WPS PQR, quality assurance manuals, welder certificates, NDE procedures, and boxes were provided during the production process. Single, invoice, material book, NDE report, water pressure report, etc.

The final customer completed the production task within the date required by the contract, conducted a quality inspection, and tested the product size and appearance according to the contract requirements. The order has been verified and is ready for completion.

We have worked with local partners in Malaysia for many years to help local companies win a lot of projects. We provide high-quality steel pipes and fittings for local project construction, and Xinyue will serve our customers wholeheartedly, as always, to provide our highly professional services.

http://www.tjxysteel.com/news/Malaysia-pipe-fittings-completion-943.html

The second tender of the Southeast Asia Bridge Construction Project was successfully completed

 Since 2018, Xinyue Steel has entered the bidding for bridge construction projects. From the design and construction of the entire project to the transportation of steel pipes and welding solutions, Xinyue Steel has always given customers the best choice and offers to customers. With comprehensive professional quality and technical services, we are finally able to solve the problems during order production and transportation. We have been fully assisted and trusted by our customers.

As the only steel pipe supplier for the entire bridge construction project, Xinyue Iron & Steel Co., Ltd., from the procurement of raw materials, the production and welding of steel pipes, the quality inspection of finished products, the testing of third-party SGS, etc., each of us has its own duties and dedication. Through various efforts, in the end of June 2019, all the steel pipe production of the second section of the project was successfully completed, and all the steel pipes were successfully delivered to the customer's construction site.

Due to the good quality of the steel pipe of Xinyue Steel, the professional service attitude of Xinyue people and the support from all aspects of the customer, the customer is very satisfied with the service and quality of Xinyue and looks forward to the future cooperation.

http://www.tjxysteel.com/news/second-of-Southeast-Asia-Bridge-Construction-Project-944.html

Analysis of fracture cause of cold-drawn seamless steel tube

 When the carbon seamless steel pipe is cold drawn, there are defects such as cracks in the hot rolled tube blank. For example, after the high-precision cold-drawn tube is made into an oil cylinder, the fracture that occurs during use has almost no plastic deformation, and is generally brittle fracture. Brittle fracture is caused by a variety of reasons. For example, when there are precipitates on the grain boundary, no matter their strength is stronger or weaker than that of the matrix, it is the cause of cracks; the segregation of inclusions on the grain boundary is also the cause of fracture; in addition, even at the intersection far less than the yield limit Under the action of variable load, fatigue fracture will also occur.

Generally speaking, the mechanical performance indicators used in the design of hydraulic (pneumatic) parts assume that the material is uniform, continuous and isotropic. According to this method, the design is considered to be safe, and sometimes accidents may occur. breakage accident. It has been found that during low-stress brittle fracture in high-strength metallic materials, the material structure is far from homogeneous and isotropic. There will be cracks, inclusions, pores and other defects in the structure, and these defects can be regarded as micro-cracks in the material.

In addition, brittle fracture is also related to the service temperature of the component. Through research, it has been found that when the temperature is lower than a certain temperature value, the material will transform into a brittle state, and its impact absorption work will decrease significantly. This phenomenon is called cold brittleness. Therefore, the design should also be based on the working temperature of the component. Choose a material with a suitable cold-brittle transition temperature.

At present, the material of cold-drawn seamless steel pipe (a53 seamless) in my country is ordinary 45# or 20# steel 27SiMn steel, which improves the metal strength through cold-drawing deformation; however, it is at the expense of sacrificing the plasticity and toughness of the metal. High-precision cold-drawn seamless steel pipe is based on its high dimensional accuracy and high-strength performance. It must ensure that the amount of deformation is within a certain range in order to maximize the performance of the material and reduce the adverse effect on the material.

The deformation of the cold-drawn seamless steel pipe is too small to meet the requirements of surface finish and dimensional accuracy, and the strength index of the component cannot be achieved; if the deformation is too large, the plasticity and toughness of the seamless steel pipe will be reduced too much, and the grains will be pulled too much. Elongated, forming a fibrous structure, the metal will have obvious anisotropy. The axial direction of the cold-drawn seamless steel pipe is parallel to the elongation direction of the grain, and the strength increases; the radial direction of the cold-drawn seamless steel pipe is perpendicular to the elongation direction of the grain, and the strength decreases instead, and the maximum stress of the hydraulic cylinder Existing in the radial direction of the seamless steel pipe, so too large deformation is unfavorable to give full play to the performance of the cold drawn pipe.

For the fiber structure and crystal defects such as dislocations and vacancies in the steel, heat treatment methods such as annealing or normalizing are generally used to eliminate them. The purpose of annealing is to refine grains, eliminate structural defects, reduce hardness, improve plasticity, and facilitate cold working. In the production of cold-drawn seamless steel pipe, annealing equipment is indispensable. Therefore, formulating a suitable annealing process is a necessary condition to ensure that the cold-drawn seamless steel pipe is qualified and the product does not have fracture defects. If the manufacturer reduces the annealing process in order to unilaterally reduce the production cost, it will definitely have an adverse impact on the product quality.

https://www.xysteelpipe.com/analysis-of-fracture-cause-of-cold-drawn-seamless-steel-tube/

Successfully won the Middle East pile pipe project

 At the beginning of December 2019, Xinyue received an inqury from customer about pile pipe projects. They need ssaw steel pipe with external coating. After a series of technical confirmation, we received the L/C at the beginning of March. This customer has strict quality requirements.

The client's project is very urgent. In order to meet the delivery date of the client, Tianjin Xinyue purchase raw materials at a high price.At present, the order is in production process smooth, we hope to complete the delivery through the active cooperation of xinyue people.

Every steps of efforts is worthy, it means that we 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/Successfully-won-the-Middle-East-pile-pipe-project-946.html

A good start for building friendship with Africa

 Xinyue Steel Group Hunan Branch have started to develop the African markets at the second half of 2018.

First to collect the human geographic information, imported and exported data...etc, to do the marketing with professional service and already have cooperation with some clients now .

Like the enquiry we received at May,2019 from Algeria, Water pipeline projects, API 5L GR.B standard, with 3PE outside and epoxy inside coating, the sales person analyse the details,offered the price list plan professionally and quickly , finally win the orders at the June,2019 through several times’ negotiation .

At this moment this order is in producing, each step we have professional person to control strictly and will delivery the best quality to clients.

http://www.tjxysteel.com/news/A-good-start-for-building-friendship-with-Africa-948.html

Awesome! African customer orders the dredging pipe again

 In April 2019, Xinyue once again received a list of the old customers' dredging projects in Africa. The products are still large straight seams and matching welding flanges. The amount is 11 containers of 40HQ. All pipes have been successfully shipped already.

As we have a deep communication for the last order with the customer, we are familiar with the customer's capital budget, product requirements and focus.It only took half day from receiving customer’s inquiry, reconfirming the details of the pipe coating,to offer the customer's final suitable plan and quotation. And the customer confirmed within one week.

When Xinyue asked why they confirmed the order so quickly, the customer told that since the last order was delivered on time under bad weather, they had put us in the long-term cooperation list, Xinyue's professional and efficient service and high-quality products have touched him. This is not only the recognition of Xinyue products, but also the praise and trust of Xinyue spirit.

Through the first China-Africa Economic Expo, we can see that the cooperation between China and African countries has become closer and closer. Xinyue will also actively respond to the call of the country, and accelerate the establishment and development of cooperation with African countries. And introduce Xinyue deep into Africa and going to the world.

http://www.tjxysteel.com/news/African-customer-orders-the-dredging-pipe-again-950.html

Five Reasons for Insufficient Hardness of Seamless Pipes

 The main reasons for the lack of hardness of seamless steel pipes (smls) are the following five points:

1. The heat treatment temperature is too high

This is mainly caused by the poor temperature setting of the processing technology or the error of the temperature control system. The temperature of the processing technology should be adjusted, and the temperature control system software should be repaired and calibrated.

2. Shorter cooling time for heat treatment

Because the refrigeration time is short, the temperature of the seamless square tube after the specific heat treatment is high, but the heat treatment itself is not carried out, and the strength after quenching is less than the standard value. When the heat treatment is completed, the temperature is generally lower than the Ms of the raw material, otherwise the strength will be lower than the standard value after quenching. When the heat treatment is completed, let the seamless square tube be air-cooled again for a while, and observe the temperature. If the temperature is high, it should be filled with refrigeration to reduce the temperature to a suitable level. Naturally, those with working experience can identify the temperature from the time when the water disappears when the water is discharged.

3. Overquenching

It is caused by too high quenching temperature setting, abnormal difference of temperature control system or mixed burning when temperature control is too high. The processing temperature should be adjusted, and the software of temperature control system should be repaired and calibrated, not higher than the set temperature.

4. Carburizing

Caused by residual carburized layer of raw material or heat treatment. To prevent such problems of seamless square and rectangular tubes, the countermeasures used are controllable atmosphere heating, salt bath heating, annealing furnaces and box furnaces are selected for loading maintenance or application of anti-oxidative architectural coatings, and the seamless rectangular The remainder of the tube machining is increased by 2-3 mm.

5. The cooling time is too long

Poor selection of refrigeration materials, temperature of heat-treating materials increases and refrigeration performance decreases, mixing is not good or the temperature of the trough is too high. Therefore, it is necessary to release and enter the tank quickly, and to grasp the refrigeration characteristics of the heat-treated material. The water temperature is 60-80 °C, and the temperature is below 30 °C. When the heat treatment amount is large and the temperature of the refrigeration material is increased, the refrigeration heat treatment material should be added or other refrigeration tanks should be used for refrigeration. In addition, pay attention to improving the mixing of the seamless pipe coolant.

https://www.xysteelpipe.com/five-reasons-for-insufficient-hardness-of-seamless-pipes/