Stainless steel, as defined in GB/T20878-2007, is a steel characterized by stainless steel and corrosion resistance, with chromium content of at least 10.5% and carbon content of at most 1.2%. Stainless steel is the abbreviation of stainless and acid resistant steel. The steel that is resistant to weak corrosive media such as air, steam and water or has stainless property is called stainless steel; The steel that is resistant to chemical corrosion medium (acid, alkali, salt and other chemical etching) is called acid resistant steel.
Due to the difference in chemical composition, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid resistant steel is generally stainless. The term "stainless steel" not only refers to one kind of stainless steel, but also refers to more than 100 kinds of industrial stainless steels. Each type of stainless steel developed has good performance in its specific application field. The key to success is to understand the purpose first, and then determine the correct steel grade. There are usually only six types of steel related to the application field of building construction. They all contain 17~22% chromium, and better steel grades also contain nickel. The addition of molybdenum can further improve the atmospheric corrosion, especially the corrosion resistance to the atmosphere containing chloride.
Generally speaking, the hardness of stainless steel is higher than that of aluminum alloy, and the cost of stainless steel is higher than that of aluminum alloy.
