Common surface defects of welded steel pipe

 Common surface defects of welded steel pipe:

(1) layered steel

Layered wall steel tube means the cross section is divided into two floors, exposed steel surface showing the hierarchical vertical cracks. Some exhibits inside and outside surfaces of steel recessed or raised locally, layered rendering suddenly raised, dents or warping in and out of the weld.

(2) sticky scar

Pipe sticky scar refers to internal and external surfaces of the massive steel focal adhesion plaques scar.

(3) holes

Pipe through the hole refers to a local steel tube bi holes exist.

(4) open welding

Welded steel pipe opening means through long cracks in steel welds or partial showing of.

(5) Local lap welding

Welded steel pipe refers to a partial outer surface of the steel pipe presents a partial arc weld.

(6) Welding ditch

Pipe welding groove is the outer surface of the steel pipe occurs through a long groove weld.

(7) the collapse of welding

Welded steel pipe collapse refers to the outer surface of the weld metal skeletons showing through a long trench, where the surface of the corresponding convex edges.

(8) pipe joints dislocation

Steel tube joint dislocation refers to the steel pipe weld, occurred the phenomenon of staggered up and down.

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A brief Introduction of Xinyue’s LSAW Steel pipe

Xinyue’s LSAW steel pipe is one of the most reliable and cost-effective solutions for various industrial applications. As a leading manufacturer of LSAW steel pipes in China, Xinyue Steel has a proven track record of delivering high-quality products to customers worldwide. In this article, we will introduce the benefits of Xinyue’s LSAW steel pipes and provide a guide for customers to buy our products.

Firstly, Xinyue’s LSAW steel pipes are made of high-quality steel and are widely used in the oil and gas industry, chemical industry, and other industrial sectors. These pipes are known for their durability, strength, and resistance to corrosion, making them the ideal solution for demanding applications.

Secondly, Xinyue’s LSAW steel pipes come in a variety of sizes and shapes to fit any industrial need. Our pipes are available in diameters ranging from 219.1mm to 1820mm, with thicknesses of up to 50mm. With a maximum length of up to 70 meters, our pipes can be customized to meet specific project requirements.

Thirdly, Xinyue Steel’s LSAW steel pipes are manufactured using advanced production technology and strict quality control processes. We use only the highest quality raw materials, and our production processes are carefully monitored to ensure that our products meet the strictest industry standards. Our pipes undergo rigorous testing to ensure that they meet the required performance specifications and that they are free from defects.

If you are looking to buy LSAW steel pipes, here is a step-by-step guide on how to purchase Xinyue’s products:

Determine your project requirements, such as pipe diameter, wall thickness, and length.

Contact Xinyue Steel and provide us with your project requirements. Our sales team will provide you with a quotation and answer any questions you may have.

Review the quotation and confirm the order with Xinyue Steel.

Our team will manufacture the pipes and perform quality control checks to ensure that they meet the required standards.

Once the pipes have been manufactured and have passed our quality control tests, we will arrange for shipping and delivery to your project site.

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Pickling process of seamless steel pipe

What is pickling?

Acids remove iron oxide scale by chemical method according to a certain concentration, temperature and speed, which is called pickling.

Pickling classification: According to the type of acid: sulfuric acid pickling, hydrochloric acid pickling, nitric acid pickling, hydrofluoric acid pickling. Pickling must choose different media according to the material of the steel, such as pickling carbon steel with sulfuric acid and hydrochloric acid, pickling stainless steel with mixed pickling of nitric acid and hydrofluoric acid, etc.

According to the shape of steel: wire pickling, forging pickling, steel pickling, strip pickling, etc.

According to the type of pickling equipment: tank pickling, semi-continuous pickling, full continuous pickling, tower pickling.

The principle of pickling for seamless steel pipes :

Pickling is a process of chemically removing iron oxide scale on the metal surface, so it is also called chemical pickling. The iron oxide scales (Fe203, Fe304, Fe0) formed on the surface of the seamless tube are all alkaline oxides that are insoluble in water. A series of chemical changes can occur with acids.

Due to the loose, porous and cracked properties of the iron oxide scale on the surface of carbon structural steel or low-alloy steel, and the repeated bending of the iron oxide scale along with the strip on the pickling unit through straightening, stretching and conveying, these The pores and cracks further increase and expand, so the acid solution reacts chemically with the iron oxide scale, and also reacts with the matrix iron of the steel through the cracks and pores. That is to say, the chemical reaction between the three kinds of iron oxide scales and metal iron and the acid solution is carried out at the same time at the beginning of the pickling.

(1) The iron oxide scale is dissolved by chemical reaction with acid (dissolution).

(2) The metal iron reacts with acid to generate hydrogen, which mechanically peels off the iron oxide scale (mechanical peeling effect).

(3) The generated atomic hydrogen reduces iron oxides to ferrous oxides which are susceptible to acid action, and then reacts with acid to be removed (reduction action).

Seamless steel pipe pickling process:

The pickling process mainly includes immersion pickling, spray pickling and acid paste rust removal. Generally, the dipping pickling method is used, and the spraying method can be used in mass production. Steel parts are generally pickled in 10% to 20% (volume) sulfuric acid solution at a temperature of 40°C. When the iron content in the solution exceeds 80g/L and the ferrous sulfate exceeds 215g/L, the pickling solution should be replaced. At room temperature, pickling steel with 20% to 80% (volume) hydrochloric acid solution is less prone to over-corrosion and hydrogen embrittlement. Because acid has a strong corrosion effect on metals, it is necessary to add corrosion inhibitors. After cleaning, the metal surface becomes silvery white, and the surface is passivated at the same time, improving the corrosion resistance of stainless steel. The process of using sulfuric acid aqueous solution with a concentration of 5% to 20% to remove scale and adhered salts on the surface of the workpiece is called sulfuric acid pickling. The industrial concentrated sulfuric acid sold on the market usually contains H2SO475%~97% (mass fraction), and brown industrial sulfuric acid solution can also be used, which contains H2SO475%~78% (mass fraction).

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

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Xinyue Steel’s EN10297 Mechanical Pipe: Quality and Durability

ASTM A519 is a standard specification for seamless carbon and alloy steel mechanical tubing, which is widely used in various applications requiring high strength, toughness, and durability. It covers several grades of carbon and alloy steel mechanical tubing, including 4140, 4130, and 1020. Xinyue Steel Group, as a leading manufacturer and supplier of steel pipes, offers a range of ASTM A519 cylinder pipes that meet the highest quality standards and can be used in demanding applications.

Xinyue’s ASTM A519 cylinder pipe is made of high-quality carbon and alloy steel, which provides excellent strength, toughness, and durability. The pipe is designed to withstand high-pressure applications, such as hydraulic cylinders, machine parts, and other mechanical applications. Xinyue’s cylinder pipe is available in a variety of sizes and shapes, including round, square, and rectangular, to meet the diverse needs of different applications.

One of the key features of Xinyue’s ASTM A519 cylinder pipe is its precise dimensions and excellent surface finish. The pipe is produced using advanced manufacturing processes, such as cold drawing and precision rolling, to ensure precise dimensions and a smooth surface finish. This not only enhances the appearance of the pipe but also improves its mechanical properties and performance.

Xinyue’s ASTM A519 cylinder pipe is also known for its excellent weldability and machinability. The pipe can be easily welded using conventional welding techniques, such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW), and can be machined using standard machining operations. This makes it an ideal choice for applications that require high precision and intricate shapes.

In summary, Xinyue’s ASTM A519 cylinder pipe is a high-quality solution for demanding applications that require strength, toughness, and durability. Its precise dimensions, excellent surface finish, and superior weldability and machinability make it an ideal choice for hydraulic cylinders, machine parts, and other mechanical applications. Xinyue Steel Group is committed to providing customers with the highest quality products and services, and our ASTM A519 cylinder pipe is no exception.

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Xinyue’s ASTM A519 Cylinder Pipe: High-Quality Solution for Demanding Applications

ASTM A519 is a standard specification for seamless carbon and alloy steel mechanical tubing, which is widely used in various applications requiring high strength, toughness, and durability. It covers several grades of carbon and alloy steel mechanical tubing, including 4140, 4130, and 1020. Xinyue Steel Group, as a leading manufacturer and supplier of steel pipes, offers a range of ASTM A519 cylinder pipes that meet the highest quality standards and can be used in demanding applications.

Xinyue’s ASTM A519 cylinder pipe is made of high-quality carbon and alloy steel, which provides excellent strength, toughness, and durability. The pipe is designed to withstand high-pressure applications, such as hydraulic cylinders, machine parts, and other mechanical applications. Xinyue’s cylinder pipe is available in a variety of sizes and shapes, including round, square, and rectangular, to meet the diverse needs of different applications.

One of the key features of Xinyue’s ASTM A519 cylinder pipe is its precise dimensions and excellent surface finish. The pipe is produced using advanced manufacturing processes, such as cold drawing and precision rolling, to ensure precise dimensions and a smooth surface finish. This not only enhances the appearance of the pipe but also improves its mechanical properties and performance.

Xinyue’s ASTM A519 cylinder pipe is also known for its excellent weldability and machinability. The pipe can be easily welded using conventional welding techniques, such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW), and can be machined using standard machining operations. This makes it an ideal choice for applications that require high precision and intricate shapes.

In summary, Xinyue’s ASTM A519 cylinder pipe is a high-quality solution for demanding applications that require strength, toughness, and durability. Its precise dimensions, excellent surface finish, and superior weldability and machinability make it an ideal choice for hydraulic cylinders, machine parts, and other mechanical applications. Xinyue Steel Group is committed to providing customers with the highest quality products and services, and our ASTM A519 cylinder pipe is no exception.

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Xinyue’s API SPEC 5DP Drill Pipe: A Reliable Solution for the Oil and Gas Industry

API SPEC 5DP is a standard specification for drill pipe used in the oil and gas industry. The standard covers the manufacturing, chemical composition, and mechanical properties of the drill pipe, ensuring its reliability and performance in demanding drilling operations. Xinyue Steel Group, as a leading manufacturer and supplier of steel pipes, offers a range of API SPEC 5DP drill pipes that meet the highest quality standards and can be used in a variety of drilling applications.

Xinyue’s API SPEC 5DP drill pipe is made of high-strength steel, which provides excellent toughness and fatigue resistance. The pipe is designed to withstand the high stresses and harsh environments encountered in drilling operations, ensuring reliable and safe drilling operations. Xinyue’s drill pipe is available in a range of sizes and grades, including Grade E, X, G, and S, to meet the specific needs of different drilling applications.

One of the key features of Xinyue’s API SPEC 5DP drill pipe is its precise manufacturing and strict quality control. The pipe is manufactured using advanced processes, such as upsetting, quenching and tempering, and friction welding, to ensure its dimensional accuracy and mechanical properties. Xinyue’s drill pipe also undergoes rigorous testing and inspection, such as non-destructive testing, visual inspection, and hydraulic testing, to ensure its quality and reliability.

Xinyue’s API SPEC 5DP drill pipe is also known for its excellent connection performance and thread integrity. The pipe is equipped with high-quality threaded connections, such as API 5DP and NC threads, that ensure the pipe can be easily connected and disconnected, even under high stress and torque conditions. The threaded connections also ensure the integrity of the pipe’s threads, preventing thread damage and reducing the risk of premature failure.

In summary, Xinyue’s API SPEC 5DP drill pipe is a reliable solution for the oil and gas industry, providing excellent toughness, fatigue resistance, and connection performance. Its precise manufacturing, strict quality control, and rigorous testing and inspection ensure its reliability and safety in demanding drilling operations. Xinyue Steel Group is committed to providing customers with the highest quality products and services, and our API SPEC 5DP drill pipe is no exception.

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Xinyue’s ГОСТ 10705-80 Steel Pipe: An Overview of its Application in Kazakhstan Market

Xinyue Steel Group is a leading manufacturer and exporter of steel pipes and related products. One of its popular products is the ГОСТ 10705-80 steel pipe, which is widely used in various industries in Kazakhstan. In this article, we will give a brief introduction to the ГОСТ 10705-80 standard and analyze its application in the Kazakhstan steel market.

ГОСТ 10705-80 Standard Overview

ГОСТ 10705-80 is a Russian standard for electrically welded steel pipes. The standard specifies the technical requirements for pipes with a diameter of up to 1420 mm and a wall thickness of up to 50 mm. The pipes can be made from low-carbon and high-carbon steels, as well as low-alloy and alloy steels. The ГОСТ 10705-80 standard covers pipes for general use, pipelines, and structural purposes.

Application in Kazakhstan Market

Kazakhstan is a landlocked country in Central Asia and a significant producer of oil and gas. The oil and gas industry is one of the major consumers of steel pipes in the country. The ГОСТ 10705-80 steel pipe is widely used in the construction of oil and gas pipelines, as well as for water supply and drainage systems, heating and cooling systems, and structural applications.

In addition, the ГОСТ 10705-80 steel pipe is also used in the construction of buildings, bridges, and other infrastructure projects. Kazakhstan is investing heavily in infrastructure development, which is driving the demand for steel pipes in the country.

Kazakhstan Steel Market Overview

Kazakhstan is one of the largest producers of steel in Central Asia. The country has a well-developed steel industry, with several steel mills and foundries operating in the country. The government has also implemented policies to promote the development of the steel industry, including tax incentives and subsidies.

The demand for steel in Kazakhstan is driven by the construction industry, as well as the oil and gas industry. The government’s infrastructure development program is also expected to boost the demand for steel in the coming years.

Conclusion: Xinyue Steel Group’s ГОСТ 10705-80 steel pipe is a popular product in the Kazakhstan steel market. The country’s thriving oil and gas industry and infrastructure development program are driving the demand for steel pipes in the country. Xinyue Steel Group is committed to providing high-quality steel pipes and related products to its customers in Kazakhstan and around the world.

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