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SUS420J2 Stainless Steel | Stainless Steel Supply

SUS420J2 is a stainless steel material, which is a type of martensitic stainless steel. Has high hardness and wear resistance. This material is often used in the manufacture of high hardness, high strength and corrosion-resistant mechanical parts such as knives, molds, bearings and valves.
The heat treatment of SUS420J2 stainless steel can be achieved by quenching and tempering to obtain the best properties and hardness. When the material is tempered at 150-370 degrees Celsius, it can obtain excellent corrosion resistance and toughness. However, when processing SUS420J2 at high temperature, care should be taken to avoid overheating and rapid cooling to avoid oxidation and deformation of the material. Its corrosion resistance is not as good as other stainless steel materials such as AISI 304 or 316.

Chemical composition


Note: These values are approximate

Mechanical properties

Tensile strengthYield strengthElongation
≥650 MPa≥440 MPa≥18%

Note: These values are approximate

Physical properties

Density7.75 g/cm³
Melting Point1450-1510℃
Coefficient of Thermal Expansion11.2 x 10^-6/K (20-100℃)
Thermal Conductivity24.9 W/(m·K) (100℃)
Electrical Resistivity0.60 μΩ·m (20℃)

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!