Seamless steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter when the bending and torsion strength is the same. It is a kind of economical cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, and bicycles. Steel scaffolds and other steel scaffolds used in building construction are used to make ring-shaped parts with steel pipes, which can improve material utilization, simplify manufacturing procedures, and save materials and processing man-hours. Steel pipes have been widely used for manufacturing.