Will stainless steel pipe rust?

The susceptibility of stainless steel to rust has a lot to do with the composition of stainless steel. In addition to iron, stainless steel also contains chromium, nickel, aluminum, and silicon. The chromium content of general stainless steel is generally not less than 12%, and the highest even reaches 18%. After adding chromium and other elements to the steel, the properties of the steel can be changed. For example, the molecular structure of steel is more uniform, and a dense oxide protective film is more easily formed on the surface of the steel, thereby greatly improving the corrosion resistance of stainless steel. Therefore, stainless steel can resist the corrosion of fire, water, acid, alkali and various solutions, and does not rust.

Stainless steel has the ability to resist atmospheric oxidation--that is, stainless steel, but also has the ability to corrode in media containing acid, alkali, and salt--that is, corrosion resistance. However, the size of its corrosion resistance varies with the chemical composition of the steel itself, the mutual state, the conditions of use, and the type of environmental medium.

Stainless steel is a thin, strong and stable chromium-rich oxide film (protective film) formed on the surface of the stainless steel. Once for some reason, such a film is constantly destroyed, oxygen atoms in the air or liquid will continue to infiltrate or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will be continuously rusted.