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Stainless steel classification

There are five basic types of stainless steel: austenitic, ferritic, martensitic, duplex, and precipitation hardening.

(1) Austenitic stainless steels are not magnetic, and the representative steel grades are 18% chromium added and a certain amount of nickel added to increase corrosion resistance. They are widely used steel grades.

(2) Ferrite is magnetic, and chromium element is its main content, with a proportion of 17%. This material has good oxidation resistance.

(3) Martensitic stainless steel is also magnetic, the content of chromium is usually 13%, and it contains an appropriate proportion of carbon, which can be hardened by quenching and tempering.

(4) Duplex stainless steel has a mixed structure of ferrite and austenite, the content of chromium is between 18% and 28%, and the content of nickel is between 4.5% and 8%. They are very resistant to chloride corrosion. Good results.

(5) The conventional content of chromium in precipitation stainless steel is 17, and a certain amount of nickel, copper and niobium are added, which can be hardened by precipitation and aging.


According to the metallographic structure, it can be divided into:

(1) Ferritic stainless steel (400 series), chromium stainless steel, mainly represented by Gr13, G17, Gr27-30;

(2) Austenitic stainless steel (300 series), chromium-nickel stainless steel, mainly represented by 304, 316, 321, etc.;

(3) Martensitic stainless steel (200 series), chromium-manganese stainless steel, high carbon content, mainly represented by 1Gr13, etc.



Post time: Sep-28-2022