Seamless stainless steel pipe is a kind of hollow long round steel, which is widely used in industrial transmission pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, machinery and instruments, etc. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used as furniture, kitchenware, etc.

Stainless steel welded steel pipe is a pipe made of stainless steel sheet or strip by welding process. Welded stainless steel pipe has the advantages of corrosion resistance, high temperature resistance and high strength, and is widely used in petroleum, chemical, pharmaceutical, food, shipbuilding and other fields. According to different applications and requirements, stainless steel welded steel pipes can be divided into many types, such as 304, 316, 321 and other stainless steel materials, as well as different welding methods such as straight seam welding and spiral welding.