Stainless steel, as one of the widely used materials in modern industry, has many unique properties. First of all, its most prominent feature is excellent corrosion resistance. Thanks to the addition of chromium in the alloy, a dense oxide film can be formed on the surface of stainless steel, which can effectively resist the corrosion of corrosive media such as water vapor, acid and alkali in the external environment, and is widely used in food processing, marine engineering and other fields with high requirements for corrosion resistance.