The difference between martensitic stainless steel and austenitic stainless steel

- Jan 31, 2018 -

The difference between martensitic stainless steel and austenitic stainless steel:

The main alloy element in martensitic stainless steel is chromium. Usually used in weak corrosive medium, such as sea water, fresh water and water vapor, the use temperature is less than or equal to 580 ℃. It is usually used as the production material of the parts and tools. Because of the poor welding performance of this steel, it is generally not used for welding. The main alloy elements in austenitic stainless steel are chromium and nickel. This kind of steel has high toughness, low brittle transition temperature, good corrosion resistance and high temperature strength, good oxidation resistance and good pressure processing and welding performance.


Martensitic stainless steel pipe


Martensitic stainless steel is introduced in detail: the mechanical properties of this stainless steel can be adjusted by heat treatment, which is, in layman's terms, a kind of hardened stainless steel. The typical brand is Cr13, such as 2Cr13,3Cr13,4Cr13, etc. After quenching, the hardness is higher, different tempering temperature has different strength and toughness combination, mainly used for steam turbine blade, tableware, surgical instrument. According to the difference of chemical composition, martensitic stainless steel can be divided into martensitic chromium steel and martensitic chromium nickel steel. According to the different structure and strengthening mechanism, it can be divided into martensitic stainless steel, martensite and semi-austenite (or semi-martensite) precipitation-hardening stainless steel and martensitic aging stainless steel.


Martensitic stainless steel


Austenitic stainless steel in detail: it refers to stainless steel with austenitic tissue at room temperature. The stable austenite tissue was found in steel with Cr about 18%, Ni 8%~10% and C 0.1%. The austenitic chromium nickel stainless steel includes the famous 18cr-8ni steel and the high cr-ni series of steel with the addition of Cr, Ni content and the addition of Mo, Cu, Si, Nb, Ti and other elements. Austenitic stainless steel is nonmagnetic and has high toughness and plasticity, but strength is low, cannot by phase transformation strengthening, can only through the cold working reinforcement, such as S, Ca, Se, Te elements, such as good free cutting.


Austenitic stainless steel


Edit by Ms. Julia Zhu of KRM/BSW (Sales Dept.)

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