420 Stainless Steel Supply


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 

420 Stainless Steel Applications

  1. Cutlery and Knife Blades: 420 stainless steel is commonly used for the manufacturing of knives, blades, and cutting tools. It offers good corrosion resistance and the ability to maintain a sharp edge.
  2. Surgical Instruments: Due to its corrosion resistance and ease of sterilization, 420 stainless steel may be used for certain surgical instruments.
  3. Dental Instruments: Dental tools and instruments that require corrosion resistance and sharpness may use 420 stainless steel.
  4. Industrial Blades: Blades used in various industrial applications, such as cutting plastics and rubber, may be made from 420 stainless steel.
  5. Scissors: Some types of scissors and shears use 420 stainless steel for its balance of corrosion resistance and sharpness.
  6. Firearms Components: Certain firearm components, such as knife blades on multi-tools or gun blades, may use 420 stainless steel.
  7. Textile Industry: Components in the textile industry, such as cutting tools and blades, may use 420 stainless steel.
  8. Mining Equipment: Some cutting tools and equipment used in mining applications may be made from 420 stainless steel.
  9. Aerospace Components: In certain aerospace applications where corrosion resistance and moderate strength are required, 420 stainless steel may be used.
  10. Industrial Equipment: Various industrial equipment, especially those requiring sharp edges and corrosion resistance, may incorporate 420 stainless steel.

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