Stainless steel flanges are not completely rust-free, but their oxidation resistance is stronger than ordinary steel, so it is called stainless steel.
Stainless steel not only can resist atmospheric oxidation, but also can corrode in acid, alkali, and salt media. However, the size of its anti-corrosion ability varies with the chemical composition of the steel itself, the state of interaction, the conditions of use, and the type of the surrounding medium. Such as the 304 flanges, in a dry and clean atmosphere, has good corrosion resistance, but they will move to the seaside area, where they will rust quickly in the sea containing a lot of salt spray, 316 flange performs well. Therefore, it is not any kind of stainless steel, which is resistant to corrosion and rust in any environment.
