Although stainless steel seamless pipes are called stainless steel, they are not rust-free. When corrosion occurs on the surface, the main reason is rust or stress corrosion cracking.

Rust may occur because of the use of stainless steel seamless pipes in corrosive environments (chloride ions), or because of the acid corrosion caused by the adhesion of oil/organic juice (such as noodle soup, vegetable juice) on the surface of the steel pipe. The surface needs to be wiped with a neutral detergent regularly to avoid the accumulation of pollutants. Coastal areas or chemical environments need to be changed to more corrosion-resistant stainless steel materials (316L) to resist chloride ions.

Another reason is stress corrosion cracking, which refers to spider web-like cracks on the inner wall of the pipe, especially under high temperature and high pressure. Stainless steel seamless pipes should be avoided from long-term contact with ammonia-containing and strong acid media. Solution treatment must be performed after welding (1050℃ rapid cooling to eliminate internal stress).