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422 Stainless Steel

Penn Stainless inventory now includes Alloy 422 (UNS  S42200) in round bar.


General Properties

With better strength at higher temperatures, Type 422 (S42200) is an appealing alternative to Type 403.  Type 422 is a hardenable martensitic stainless steel which is being widely used for high temperatures up to 1200°F. It is capable of being heat treated to various high strength levels. It is often used in aircraft and power industries who require high strength/weight ratios from room temperature to 1200°F.


  • Aircraft parts
  • Steam and gas turbine components
  • High heat components
  • Rotors


  • UNS: ASTM/ASTE 42200
  • DIN: 1.4935

Corrosion Resistance:

  • Adaptable to applications where maximum resistance to corrosion is not required.
  • Resistant to the corrosive action of the atmosphere, fresh water, steam, and a variety of the milder acids and alkalies.

Oxidation Resistance:

  • Good resistance to destructive scaling or oxidation
  • Continuous service at temperatures up to 1250F.
  • Temperature will vary with the type of atmosphere, type of construction, and cycle of operation.


  • Comparable to 18-8 but easier to machine
  • Help avoid galling with sharply ground tools
  • Maintain consistent speed and feed
  • Turning tools: 8-14° side rake
  • Drilling: 140° point
  • Threading: grind tools with 10-15° back rake
  • Cobalt high-speed tools: turn at 90-120 sfpm, drill at 40-75 sfpm, mill at 70-120 sfpm, ream at 20-60 sfpm, roughing and finishing at 200-400 sfpm


  • Initial forging and rolling at 2100° to 2150°F (1149° to 1177°C)
  • 1700°F (927°C) minimum to hot work

Chemical Properties:

C Mn Si Mo Cr Ni W
% in 422 0.23 0.75 0.35 1.00 11.50 0.80 1.00

Mechanical Properties:

Grade Tensile Strength MPa (min) Yield Strength 0.2% MPa(min) Elongation % Hardness (Brinell) MAX Hardness (Rockwell B) MAX
422 897 207 15 290 95

Physical Properties:

Physical Properties for Stainless Steel type 422 will be available shortly