Author: Site Editor Publish Time: 2023-06-08 Origin: Site
Stainless steel is usually divided into various models such as 201, 202, 301, 304, 309s, 310s, 410, 420, 431, etc. Among them, 201, 202, 301, 304, 309s, and 310s belong to austenitic stainless steel, which does not contain magnetism and can withstand corrosion in various media. 410, 420 and 431 belong to Martensitic stainless steel, which has magnetism and high strength, but poor plasticity and weldability
1、 What is stainless steel
Stainless steel is the abbreviation for stainless steel and acid resistant steel. Steel that is resistant to weak corrosive media such as air, steam, water, or has rust resistance is called stainless steel; And the steel grade that is resistant to chemical corrosion media (such as acid, alkali, salt, etc.) corrosion is called acid resistant steel.
Stainless steel is usually divided into Martensite steel, ferritic steel, austenitic steel, austenitic ferritic (duplex) stainless steel and precipitation hardening stainless steel according to the structure state. In addition, it can be divided into chromium stainless steel, chromium nickel stainless steel, and chromium manganese nitrogen stainless steel according to their composition.
2、 Main components of stainless steel
The corrosion resistance of stainless steel decreases with the increase of carbon content, therefore, most stainless steels have low carbon content, with a maximum of no more than 1.2%. Some steels have ω C (carbon content) is even lower than 0.03% (such as 00Cr12). The main alloying element in stainless steel is Cr (chromium), and only when the Cr content reaches a certain value, the steel has corrosion resistance. Therefore, stainless steel generally has a Cr (chromium) content of at least 10.5%. Stainless steel also contains elements such as Ni, Ti, Mn, N, Nb, Mo, Si, Cu, etc.
