Different from the duplex pipe, the surface treatment of stainless steel seamless pipe is one of the key factors determining the service life of pipeline anti-corrosion. It is the premise that the anti-corrosion layer and steel tube can be firmly combined. According to the research institute, the life of the anti-corrosion layer depends on the coating type, coating quality and construction environment. The surface treatment of the seamless steel pipe affects the life of the anti-corrosion layer by about 50%. The production of stainless steel seamless pipes is very strict, because a little difference will lead to the scrap of finished products, cold drawn seamless steel pipes are made by black or gray phosphating, sealing, anti-rust treatment. The inner and outer surfaces of the stainless steel seamless tube form a dense phosphating layer, which is then rust-proofed to effectively prevent oxidation of the steel tube. The anti-rust performance of the steel tube is very good. Therefore, since the surface of the steel tube is a phosphating film formed by phosphating micropores, it can be strong. The paint is attached to the surface of the steel pipe to effectively prevent the paint ...