420 Stainless Steel Alloy

UNS: S42000
EN-DIN: 1.4021

420 Stainless Steel Strip, Coil & Sheet

  • AMS 5506
  • ASTM A240

Our wide capabilities give us a unique ability to supply all of your 420 stainless steel strip, coil, and sheet needs.

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420 Stainless Steel Alloy Description:

Type 420 is a martensitic stainless steel that has good corrosion resistance with increased strength and hardness compared to Type 410. Maximum corrosion resistance is attained in the fully hardened condition. The alloy is magnetic in both the annealed and hardened conditions.


420 Stainless Steel Alloy Uses & Applications:

Applications include:

  • Dental and surgical instruments
  • Cutlery
  • Scissors

Industries supplied include:

Nominal Composition


Physical Properties

At 70°FAt 20°C
Density0.28 lb./in³7.74 g/cm³
Modulus of Elasticity (E)29.0 x 10³ ksi200 GPa
Coefficient of Expansion5.7 µin/in-°F (32-212°F)10.2 μm/m-°C (0-100°C)
Electrical Resistivity21.71 μ ohm.in55 μ ohm.cm
Thermal Conductivity14.4 Btu-in./ft.²hr.-°F (212°F)24.9 W/m-K (100°C)

Typical Mechanical Properties

Typical mechanical properties are based on ASTM A240. For further information, Contact us.

ConditionTensile Strength Min (UTS)0.2% YS MinElongation% in 2” Min (50.8 mm)Hardness Rockwell
Annealed85 ksi (MPa)45 ksi (MPa)25%88 HRBW
Limitation of Liability and Disclaimer of Warranty:
  • The content in these data sheets is provided primarily by third-party melting mills and is provided for reference only. It is not intended for engineering or design.
  • Applications may be discussed, however, Combined Metals Company, LLC, does not recommend or endorse any material for any particular end use or application.
  • The data included in this data sheet are typical values and may vary.
  • Combined Metals Company, LLC, makes no representations or warranties, express or implied, as to the accuracy, completeness, condition, suitability, performance, fitness for a particular purpose, or merchantability of any information contained in any data sheet.

In no event will Combined Metals Company, LLC, be liable for any damages whatsoever arising from the use of the information included in the data sheets.

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