Processing technology of structural carbon steel seamless pipes

With the continuous development of industry, carbon steel seamless pipes (CS SMLS Pipe) are increasingly utilized in various fields, attracting significant attention to their processing technology. These pipes offer advantages such as a hollow cross-section, uniform wall thickness, smooth internal and external surfaces, and stable quality. They are widely used for transporting oil, natural gas, water, and other fluids, as well as in structural and mechanical applications. This article introduces the six major processing technologies for carbon steel seamless pipes used in structural applications.

1. Cold Drawing Processing

Cold drawing is a common method in processing carbon steel seamless pipes. By stretching and compressing the steel pipe through a mold, the diameter is reduced, the wall thickness is decreased, and the length is increased. This method produces high-precision pipes with uniform wall thickness and smooth surfaces, widely used in the petroleum, chemical, and construction industries.

2. Hot Rolling Processing

In hot rolling, the steel pipe is heated to a high temperature and then rolled through a mold, deforming it to reduce its size and wall thickness. This process yields large-diameter, high-strength, and high-temperature-resistant carbon steel seamless pipes, ideal for applications in boilers, pressure vessels, and the oil and gas sectors.

3. Cold Rolling Processing

Cold rolling involves rolling steel pipes at room temperature. Through multi-pass rolling, the pipes are deformed, reducing their size and wall thickness. This method produces high-precision pipes with smooth surfaces and uniform wall thickness, commonly used in the automotive and machinery manufacturing industries.

4. Extrusion Processing

Extrusion involves adding a heated billet to an extruder and using an extrusion rod to force the billet through a die, forming a pipe of the required shape and size. This process produces small-diameter, thin-walled, high-precision carbon steel seamless pipes, widely used in aerospace and automotive manufacturing.

5. Straightening Processing

Straightening ensures the seamless steel pipe achieves specified straightness and flatness, improving quality and stability. This process prevents bending and deformation during transportation and use, and is commonly applied in the manufacturing and processing of various carbon steel seamless pipes.

6. Polishing Processing

Polishing enhances the surface finish and aesthetics of carbon steel seamless pipes. Methods include mechanical polishing, chemical polishing, and electrochemical polishing, chosen based on application requirements. Polishing improves corrosion resistance and extends the service life of the pipes, making them suitable for use in petrochemical, food, and pharmaceutical industries.

These processing technologies enable carbon steel seamless pipes to meet diverse industry standards and applications, ensuring high-quality and reliable performance across various sectors.