Austenitic stainless steel is the most important category of stainless steel, its production and consumption accounted for 70% of the total amount of stainless steel. According to the alloying method, austenitic stainless steel can be divided into two categories of chrome-nickel steel and iron-chromium-manganese steel. The former is nickel as austenitic element, is the main body of austenitic steel; the latter is manganese, nitrogen instead of expensive nickel nickel nickel. 

Overall, austenitic steel corrosion resistance is good, a good comprehensive mechanical properties and process performance, but the strength, hardness is low. 

Second, ferritic stainless steel 

Ferritic stainless steel containing chromium 11% -30%, basically no nickel, is the nickel-nickel alloy, in the use of the state structure of the main ferrite. 

Ferritic stainless steel strength is higher, and cold work hardening tendency is low, resistance to chloride stress corrosion, pitting corrosion, crevice corrosion and other local corrosion performance is excellent, but sensitive to intergranular corrosion, low temperature toughness is poor. 

Three, duplex stainless steel 

It is generally believed that the presence of more than 15% ferrite on the austenitic matrix or the presence of more than 15% austenite on the ferrite matrix is called austenite + ferrite duplex stainless steel. 

The advantages of both duplex stainless steel and austenitic steel and ferritic steel. 

Fourth, martensitic stainless steel 

Martensitic stainless steel is a kind of heat treatment can be used to adjust the performance of the steel, its strength, high hardness. 

Fives, precipitation hardening stainless steel 

Precipitation hardening stainless steel is through the heat treatment means to precipitate the carbide in the steel, so as to achieve the purpose of improving the strength of the steel. 

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