Structural seamless steel pipes are seamless steel pipes used for general structures and mechanical structures. Making rings with steel pipes can improve the utilization rate of materials, simplify the manufacturing process, and save materials and processing time, such as rolling bearing rings, jack sleeves, etc. Low-alloy high-strength structural steel pipe with carbon ratio structural steel. It has the advantages of high strength, good comprehensive performance, long service life, wide application range and relatively economical. Most of the steel is rolled into sheets, profiles, seamless steel pipes, etc., which are widely used in bridges, ships, boilers, vehicles and important building structures. Also used in the manufacture of seamless steel pipes for pipes, vessels, equipment, fittings and mechanical structures. This structural steel pipe is compared to carbon structural steel. It has the advantages of high strength, good comprehensive performance, long service life,…