Difference between martensitic stainless steel and austenitic stainless steel

Austenitic stainless steel:

Containing more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and can resist corrosion of various media.

Austenite crystal structure

The common brands of austenitic stainless steel are 1Cr18Ni9, 0Cr19Ni9, etc. The WC of 0Cr19Ni9 steel is less than 0.08%, marked as “0” in steel grade. This kind of steel contains a lot of Ni and Cr, which makes the steel austenite at room temperature.

This kind of steel has good plasticity, toughness, weldability and corrosion resistance. It has good corrosion resistance in oxidizing and reducing media. It is used to make acid resistant equipment, such as corrosion resistant containers and equipment linings, transmission pipelines, nitric acid resistant equipment parts, etc.

Austenitic stainless steel is generally treated by solution treatment, that is, the steel is heated to 1050-1150 ℃, and then cooled to obtain single-phase austenite structure.

Martensitic stainless steel:

High strength, but poor plasticity and weldability.

Martensitic crystal structure

The commonly used grades of martensitic stainless steel are 1Cr13, 3Cr13, etc. because of its high carbon content, it has high strength, hardness and wear resistance, but its corrosion resistance is slightly poor. It is used for some parts with high mechanical property requirements and general corrosion resistance requirements, such as spring, turbine blade, hydraulic compressor valve, etc.

This kind of steel is used after quenching and tempering.

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