Cobalt Alloy 21

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Cobalt Alloy 21

Cobalt Alloy 21 supplied by Shanxi Youte Steel (jlhsteel.net).

Chemical Composition (%)

CR25
MO5
NI1.5
C0.2

Chinese Standard

AMS 5385

Equivalent Grades

Stellite 21

Applications

Specialty, corrosion-resistant and electronic applications.

Available Forms

Bar, Plate, Sheet, Tube, Wire, Casting, Forging

Uses

Martensitic stainless steel combining moderate corrosion resistance with high strength and hardness after heat treatment. Used for cutlery, surgical instruments, turbine blades, valves, pumps, fasteners and bearings in mildly corrosive environments.

Heat Treatment

Annealing/quench from 980–1050 °C (oil or air) then temper 150–650 °C; lower temper gives higher hardness, higher temper improves toughness.

Precautions

Preheat and post-weld heat treat to avoid hydrogen cracking; soft anneal before heavy machining. Lower corrosion resistance than austenitic grades — not for strong chlorides.

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