420 stainless steel is a hardenable, martensitic stainless steel that is a modification of Alloy 410. Similar to 410, it contains a minimum of 12% chromium, just sufficient enough to give corrosion resistant properties. 420 stainless steel has higher carbon content than 410 stainless steel which is designed to optimize strength and hardness characteristics. It has good ductility in the annealed condition but is capable of being hardened to a minimum Rockwell hardness of 50 HRC, the highest hardness of the 12% chromium grades. Due to its hardening properties,

420 stainless steel is not often welded, although it is possible. Martensitic stainless steels are designed for high hardness and sometimes other properties are to some degree compromised. Corrosion resistance is lower than the common austenitic grades and their useful operating range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures. Its best corrosion resistance is achieved when the metal is hardened and surface ground or polished.

420 Stainless Steel Properties

Corrosion Resistance: 420 stainless steel has moderate corrosion resistance. It can withstand exposure to water, mild acids, and other corrosive substances without corroding or rusting.

Strength: 420 stainless steel has high strength and hardness, making it ideal for applications that require high mechanical strength. It has a minimum tensile strength of 640 MPa and a minimum yield strength of 345 MPa.

Ductility: 420 stainless steel has moderate ductility, which means that it can be formed and shaped, but not as easily as other types of stainless steel. This property makes it suitable for applications that require moderate ductility.

Weldability: 420 stainless steel is easily weldable, but it may require preheating to prevent cracking. It can be welded using common welding techniques, such as TIG, MIG, and resistance welding.

Magnetic Properties: 420 stainless steel is magnetic, which makes it suitable for applications that require magnetic properties.

Heat Resistance: 420 stainless steel has good heat resistance and can withstand moderately high temperatures without losing its strength or corrosion resistance. It can withstand temperatures up to 540°C (1000°F) without undergoing any significant change in its properties.

Chemical Properties

4200.15110.040.0312.0 - 14.0

Physical Properties

DensityThermal ConductivityElectricalModulus ofCoefficient ofSpecific Heat
kg/m^3W/mKResistivityElasticityThermal Expansion(J/kg.K)
  (Microhm/cm) µm/m/°C 
775024.9 at 212°F550 (nΩ.m) at 68°F200 GPa10.3 at 32 – 212°F460 at 32°F to 212°F
 – at 932 °F  10.8 at 32 – 599°F 
    17.7 at 32-1000°F 

What Stainless Steel Grades We Have!

Qinghe Steel is a full line supplier and processer of 420 stainless steel coil, sheet, plate, bar, and strip products. We stock many grades of stainless steel, including 300 and 400 series stainless, annealed and in various tempers and high temperature grades, for shipments worldwide. View our steel center here>

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