Stainless steel

Stainless Steel (Stainless Steel) according to GB/T20878-2007 is defined as stainless, corrosion resistance as the main characteristics, and the chromium content of at least 10.5%, the carbon content of no more than 1.2% steel.
Stainless steel is the abbreviation of stainless steel, resistant to air, steam, water and other weak corrosive media or stainless steel; The steel that is resistant to chemical corrosion media (acid, alkali, salt and other chemical etching) is called acid-resistant steel.
Due to the difference in the chemical composition of the two, their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical medium corrosion, and acid-resistant steel is generally stainless. The term "stainless steel" does not simply refer to one kind of stainless steel, but means more than one hundred kinds of industrial stainless steel, each stainless steel developed has good performance in its specific application field. The key to success is  to understand the purpose and then to 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 the better grades also contain nickel. The addition of molybdenum can further improve the corrosion of the atmosphere, especially the corrosion resistance of the atmosphere containing chloride.
In general, the hardness of stainless steel is higher than that of aluminum alloy, and the cost of stainless steel is higher than that of aluminum.