Stainless Steel / 420-F ANN

420F stainless steel is a martensitic alloy and is identical to 420 stainless steel, but with an addition of Sulfur (Type 2) to dramatically improve the machinability. This alloy has excellent corrosion properties when hardened and offers good ductility in the annealed condition. This grade is used in similar applications to 420 but where complex geometries require good machining requirements such as dental and surgical equipment. (UNS S42020)

Chemical Makeup

Element Min Max
Carbon, C 0.3 0.4
Manganese, Mn - 1.25
Silicon, Si - 1
Sulfur, S 0.15 0.35
Phosphorus, P 0.06
Chromium, Cr 12 14
Molybdenum, Mo - 0.6

Common Applications

  • Aerospace Aerospace
  • Medical Medical


  • Good Machinability
  • High Strength
  • High Hardness
  • Corrosion Resistance
  • Oxidation Resistance

We stock 420-F ANN to the following specifications:

  • AMS-5620 TYPE 2
  • ASTM-A-484
  • ASTM-A-582

Click on a cross-section to see the sizes we stock:

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