Seamless pipe is a long strip of steel with a hollow section and no seams around it. According to the cross-sectional shape, seamless pipes can be divided into circular steel pipes, square steel pipes, special-shaped seamless steel pipes, rectangular seamless pipes, etc. Seamless pipes are widely used in fluid transportation, boiler manufacturing, engineering machinery and other fields due to their unique structure and properties.

It can destroy the casting structure of steel ingots, refine the grain size of steel, and eliminate defects in the microstructure, thereby making the steel structure dense and improving its mechanical properties. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; Bubbles, cracks, and looseness formed during pouring can also be welded under high temperature and pressure.

Cold drawn or cold-rolled precision seamless steel tubes (GB3639-2018) are precision seamless steel tubes with high dimensional accuracy and good surface smoothness used in mechanical structures and hydraulic equipment.

Precision bright tube is a high-precision steel pipe material that has been processed through precision drawing or cold rolling. Due to the lack of oxide layer on the inner and outer walls, high pressure resistance without leakage, high precision, high smoothness, no deformation during cold bending, expansion, flattening without cracks, etc., precision bright tubes are mainly used to produce products for pneumatic or hydraulic components, such as cylinders or oil cylinders, which can be seamless tubes or welded tubes.

In order to improve the durability and corrosion resistance of seamless steel pipes, anti-corrosion treatment is usually carried out during the production process. One common treatment method is hot-dip galvanizing or spraying anti-corrosion coatings. When the sprayed coating is black or contains black components, the surface of the steel pipe will appear darker. This anti-corrosion treatment not only enhances the durability of steel pipes, but also provides better protection in high temperature, humid or corrosive environments.