Stainless acid-resistant steel is referred to as stainless steel. It is composed of stainless steel and acid-resistant steel. In short, steel that can resist atmospheric corrosion is called stainless steel, while steel that can resist corrosion by chemical media (such as acids) is called acid-resistant steel. Generally speaking, steel with a chromium content of more than 12% has the characteristics of stainless steel; stainless steel can be divided into five categories according to its microstructure after heat treatment: ferritic stainless steel, martensitic stainless steel, austenitic stainless steel, austenitic-ferritic stainless steel and precipitation hardened stainless steel.
