Stainless steel pipe according to the material is divided into ordinary carbon steel pipe, high quality carbon structure steel pipe, alloy structure pipe, alloy steel pipe, bearing steel pipe, stainless steel pipe and to save precious metals and meet the special requirements of bimetallic composite pipe, coating and coating pipe.There are many kinds of stainless steel tubes, different uses, different technical requirements, production methods are also different.The current production of steel pipe diameter range of 0.1-4500mm, wall thickness range of 0.01-250mm.In order to distinguish its characteristics, the steel tubes are usually classified as follows.