Introduction to Stainless Steel (Metal Material)

Stainless steel, as defined in GB/T20878-2007, has stainless steel and corrosion resistance as its main characteristics, and a chromium content of at least 10.5% and a carbon content of 1.2%.

Stainless steel is the abbreviation for stainless acid-resistant steel. Steel grades that are resistant to weak corrosive media such as air, steam, and water, or have nonrusting properties are called stainless steel; Steel grades that are resistant to chemical corrosion media (such as acid, alkali, salt, etc.) are 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 generally has nonrusting properties. The term 'stainless steel' does not simply refer to a single type of stainless steel, but rather to over a hundred types of industrial stainless steel, each developed with performance in its specific application field. The key to success is to understand the purpose 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. Adding molybdenum can further improve atmospheric corrosiveness, especially resistance to corrosion in chloride-containing atmospheres.