Stainless steel (Stainless Steel) is an abbreviation for stainless acid-resistant steel. Steels that are resistant to weakly corrosive media such as air, steam, and water, or stainless steels are called stainless steel; and chemical-resistant media (such as acid, alkali, and salt) The type of steel that is corroded is called acid-resistant steel.

　　Due to the difference in chemical composition between the two, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical media corrosion, while acid-resistant steel is generally stainless. The term "stainless steel" refers not only to a single type of stainless steel, but to more than a hundred industrial stainless steels, each of which has been developed to have good performance in its specific application. The key to success is to first figure out the purpose and then determine the right steel grade. There are usually only six types of steel related to the application of building construction. They all contain 17 to 22% chromium, and the better steels also contain nickel. The addition of molybdenum can further improve the atmospheric corrosivity, especially the corrosion resistance of chloride-containing atmospheres.

　　Stainless steel refers to steel that is resistant to corrosion by weakly corrosive media such as air, steam, and water, and chemically corrosive media such as acid, alkali, and salt. It is also called stainless acid-resistant steel. In practical applications, steel that is resistant to weakly corrosive media is often referred to as stainless steel, and steel that is resistant to chemical media is referred to as acid-resistant steel. Due to the difference in chemical composition between the two, the former is not necessarily resistant to corrosion by chemical media, while the latter are generally stainless. The corrosion resistance of stainless steel depends on the alloying elements contained in the steel.