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Stellite® alloy 21

 

Subcategory: Superalloy; Cobalt Base

Close Analogs: Vitallium, ASTM F75, HS21

Key Words: AMS 5385, ASTM A732 Gr.21, MIL-C-13358, Deloro Stellite Inc.

Material Notes:
Cobalt content as balance. Excellent high temperature strength, high toughness. Solution treat at 1191-1204°C, rapid air cool, age between 538-871°C to increase hardness and strength at the expense of impact and ductility.

Applications: turbine blades and vanes, hot die applications, components in combustion or exhaust systems where high strength to 816°C and oxidation to 1093°C is required, used as medical and dental components as well as remelt stock.

X

Corrosion:Excellent resistance to body fluids and has been used for medical implants, dental fixtures, and surgical equipment. Good resistance to cavitation corrosion.

Machinability: best in solution treated condition. Carbide tipped tools and low speeds and feeds should be used to avoid work hardening. Lubrication is normally used.

X

Wear: Excellent galling resistance when self-mated or mated with Stellite alloy-6. Resistance to cavitation erosion nearly as good as Stellite alloy 6 and as good or better at high loads. Lower carbon content makes it inferior to Stellite alloy 6 for low stress abrasion resistance.

Data provided by the manufacturer, Deloro Stellite Inc.

Available Properties
  • Density
  • Hardness, Brinell
  • Hardness, Knoop
  • Hardness, Rockwell A
  • Hardness, Rockwell B
  • Hardness, Rockwell C
  • Hardness, Vickers
  • Tensile Strength, Ultimate
  • Tensile Strength, Yield
  • Elongation at Break
  • Modulus of Elasticity
  • Compressive Yield Strength
  • Charpy Impact
  • CTE, linear 250°C
  • CTE, linear 500°C
  • Thermal Conductivity
  • Melting Point
  • Solidus
  • Liquidus
   
Property Data

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