420 Stainless Steel

Shapes Available

  • Coil
  • Round Bar


  • Manufacturing
  • Natural Gas
  • Oil Refining
  • Petrochemical

Industry Names

  • 420 Stainless


  • Stainless Steel


  • AMS 5621
  • ASTM A176


  • Ball Check Valves
  • Gauges
  • Gears
  • Needle Valvles
  • Shafts
  • Surgical and Dental Instruments


  • Accuracy in Heat Treatment
  • Corrosion Resistance
  • High Strength

420 Stainless Steel is a martensitic stainless steel that has similar corrosion resistance to 410. In addition, it has increased strength and hardness. 420 is magnetic in both hardened and annealed conditions. In order to attain maximum corrosion resistance 420 must be fully hardened and stress relieved. Looking for more information on 420? Here’s our latest video on Just that, if you need more info on martensitic stainless grades, Check out our latest video on the 400 series martensitic stainless steels here or just watch below:





Please contact us to request a quote. We specialize in hard to find material.

We work closely with many manufacturers in the aerospace & defense industry. We work with NADCAP approved heat treaters and testing laboratories. We can supply DFARS compliant material.

Metal Properties
Electrical Resistivity 331 Ohms (circ mil./ft.)
Density 0.279 lb/inch³
Chemical Composition
C- .15
Cr12.0 14.0
Fe- Bal
Mn- 1.0
P- .04
S- .03
Si- 1.0
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