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Stainless steel round pipe is a long round steel, which is mainly widely used in petroleum, chemical, medical, food, light industry, machinery and instruments and other industrial transportation pipelines and mechanical structural components. In addition, it is lighter in weight when the bending and torsional strength are the same, so it is also widely used in the manufacture of machine parts and engineering structures. It is also commonly used in the production of various conventional weapons, gun barrels, artillery shells, etc. This type of steel pipe can be divided into two categories: stainless steel seamless steel pipe and stainless steel welded steel pipe (seamed pipe).