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431 Stainless Steel | Stainless Steel Supply

431 stainless steel is a high hardness, high strength martensitic stainless steel. The corrosion resistance and mechanical strength of 431 stainless steel can be improved by adding molybdenum and chromium. This stainless steel has excellent mechanical properties, grinding and wear resistance, and has good corrosion resistance and heat treatment performance. Therefore, it is often used in the manufacture of high-strength, high wear-resistant parts, such as bearings, valves, threads, bolts and connections. In addition, 431 stainless steel is also suitable for the manufacture of high wear-resistant knives, molds and clamps. It should be noted that the welding performance of 431 stainless steel is poor, so it is necessary to handle it carefully and choose suitable welding materials when welding.

Chemical composition


Note: These values are approximate

Mechanical properties

Tensile strengthYield strengthElongation
≥690 MPa≥345 MPa≥20%

Note: These values are approximate

Physical properties


Density7.8 g/cm³
Elastic modulus200 GPa
Thermal expansion coefficient10.4 × 10^-6/K
Thermal conductivity24 W/(m·K)
MagneticYes, can be magnetic depending on processing

Note: These values are approximate

As a premium supplier of stainless steel, we offer a wide range of grades, sizes and finishes to suit your needs.
Size: according to customer requirements
Standards: GB, ASTM, EN, JIS, etc.
Austenitic type
Ferritic type
Martensitic type

Looking forward to your inquiry!