Stainless steel pipe is a kind of hollow strip round steel, which is widely used in industrial transportation pipelines and mechanical structural parts such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments and so on. In addition, under the same bending and torsion strength, it is lighter, so it is also widely used to manufacture mechanical parts and engineering structures. It is also often used to produce various conventional weapons, barrels, shells and so on.