The seamless steel pipe is hollowed out in the middle, which is mainly used to transport fluids, such as gas, natural gas, oil and solid materials. Compared with solid steel pipe, seamless steel pipe is lighter in weight and is a kind of economical cross-section steel. Seamless steel pipe is widely used in the manufacture of mechanical parts and structural parts, such as automobile transmission shafts, oil drill pipes, and steel scaffolding used in construction.