Stainless steel is the abbreviation of rust-resistant steel, resistance to air, steam, water and other weak corrosive media or rust-resistant steel is called stainless steel, and the chemical corrosion resistance medium (acid, alkali, salt and other chemical erosion) corrosion of steel is called acid-resistant steel. Because of the difference in chemical composition, the corrosion resistance of the two is different, ordinary stainless steel is generally not resistant to chemical media corrosion, and acid-resistant steel is generally non-rust. The term "stainless steel" refers not only to a stainless steel, but to more than 100 kinds of industrial stainless steel, each of which is developed with good performance in its specific application areas. The key to success is first to understand the use, and then to determine the correct steel. There are usually only six kinds of steel related to the field of construction and structural applications. They all contain 17~22% chromium, and better steel also contains nickel.
The addition of molybdenum can further improve atmospheric corrosion, especially in the atmospheric corrosion resistance of chloride. Stainless steel refers to the resistance to air, steam, water and other weak corrosive media and acid, alkali, salt and other chemical etching media corrosion of steel, also known as rust-resistant steel. In practical applications, steel that is resistant to weak corrosive media is often referred to as stainless steel, while steel corrosion resistant to chemical media is called acid-resistant steel. Due to the difference in chemical composition between the two, the former is not necessarily resistant to chemical media corrosion, while the latter is generally non-rust. The corrosion resistance of stainless steel depends on the alloy elements contained in the steel.