6 major processing technologies for seamless steel pipes for structures

As industry advances, seamless steel pipes (SMLS) are gaining popularity across various sectors due to their processing techniques. These pipes are noted for their hollow cross-section, consistent wall thickness, and smooth surfaces, which contribute to their reliable quality. They are extensively used in fluid transportation for oil, natural gas, and water, as well as in structural and mechanical components. This article outlines six key processing technologies for seamless steel pipes used in structural applications.

Cold Drawing

A prevalent method, cold drawing involves pulling and compressing the steel pipe through a die to reduce its diameter, decrease wall thickness, and elongate its length.

This process yields seamless steel pipes with high precision, uniform wall thickness, and a smooth surface, suitable for applications in the petroleum, chemical, and construction industries.

Hot Rolling

Involves heating the steel pipe to a high temperature and then rolling it through a die to reduce its dimensions and wall thickness.

Hot rolling is capable of producing large-diameter, high-strength, and heat-resistant seamless steel pipes, suitable for use in boiler tubes, pressure vessels, and the oil and gas industry.

Cold Rolling

Rolling the steel pipe at room temperature, cold rolling reduces the pipe's size and wall thickness through multiple passes.

It results in seamless steel pipes with high precision, a smooth surface, and uniform wall thickness, ideal for the automotive and machinery manufacturing sectors.

Extrusion

Extrusion involves pushing heated billets through an extruder, where they are forced through a die to form pipes of the desired shape and size.

This method is suitable for producing seamless steel pipes with small diameters, thin walls, and high precision, commonly used in aerospace and automotive manufacturing.

Straightening

Straightening aligns the manufactured seamless steel pipe to meet specific straightness requirements.

It enhances the quality and stability of the pipes, reducing the likelihood of bending or deformation during transport and use, and is widely applied in the production of various seamless steel pipes.

Polishing

Polishing enhances the surface finish and aesthetics of seamless steel pipes through mechanical, chemical, or electrochemical methods, chosen based on application needs.

It improves the corrosion resistance and service life of the pipes, broadening their use in industries such as petrochemical, food, and pharmaceutical.

These six major processing technologies for seamless steel pipes are selected based on specific requirements and material properties to produce high-quality, high-performance pipes. As technology progresses, these methods continue to evolve, expanding the potential applications of seamless steel pipes.