With the continuous development of industry, seamless steel pipe (SMLS) is more and more widely used in various fields, and its processing technology is also increasingly paid attention to. Seamless steel pipe has the advantages of hollow section, uniform wall thickness, smooth internal and external surface, stable quality, etc., widely used in oil, natural gas, water and other fluids transportation, as well as structural parts, mechanical parts and other fields. This paper will introduce six processing technology of seamless steel pipe for structure.
1. Cold drawing
Cold drawing is a common processing method in seamless steel pipe processing. The steel pipe is stretched and compressed by the mold, and the diameter, wall thickness and length of the steel pipe are reduced. Cold drawing can produce seamless steel pipes with high precision, uniform wall thickness and smooth surface, which are widely used in petroleum, chemical industry, construction and other fields.

2. Hot rolling
Hot rolling is to heat the steel pipe to a high temperature state, and then roll through the mold, so that the steel pipe deformation, size reduction, wall thickness reduction. Hot rolling can produce large diameter, high strength, high temperature resistant seamless steel pipe, widely used in boiler pipes, pressure vessels, oil and natural gas and other fields.
3. Cold rolling
Cold rolling is the process of rolling steel pipe at room temperature. After multiple rolling passes, the steel pipe is deformed, the size is reduced and the wall thickness is reduced. Cold rolling can produce seamless steel pipe with high precision, smooth surface and uniform wall thickness, which is widely used in automobile and machinery manufacturing.
4. Extrusion
Extrusion is to add the heated blank to the extruder, and under the action of the extrusion rod, the blank flows out through the mold to form the pipe of the required shape and size. Extrusion can produce small diameter, wall thickness, high precision seamless steel pipe, widely used in aerospace, automobile manufacturing and other fields.
5. straightening processing
The straightening process is to straighten the manufactured seamless steel pipe so that it reaches the specified straightness and straightness. Straightening processing can improve the quality stability of seamless steel pipe, so that seamless steel pipe is not easy to bend and deform during transportation and use, and straightening processing is widely used in the manufacturing and processing of various seamless steel pipes.
6. polishing processing
Polishing process is to treat the surface of seamless steel pipe to improve its surface finish and beauty. The polishing process can be carried out by mechanical polishing, chemical polishing and electrochemical polishing, and the appropriate polishing method can be selected according to different application requirements. Polishing can improve the corrosion resistance of seamless steel pipe, extend its service life, and make it more widely used in petrochemical, food and medicine fields.
The above is the six processing processes of seamless steel pipes for structure, which can be selected according to different needs and material characteristics to produce high-quality, high-performance seamless steel pipes. With the continuous development of science and technology, these processing technologies are also continuously improved and perfected, providing a broader space for the application of seamless steel pipes.