Stellite 21

High-Temp Steel

Stellite 21

Co-base wear & heat resistant alloy. (ASTM/AMS; equiv AMS 5387). Nominal values—confirm mill certificate.

Chemical Composition (%)

CR27
W4
C0.9
FE3

Mechanical Properties

Hardness:≥40 HRC

Equivalent Standards

AMS 5387

Equivalent Grades

AMS Stellite 21

Applications

钴基耐磨损耐热合金。,"Bar

Available Forms

Cast"

Uses

Heat- and creep-resistant steel for elevated-temperature service with stable strength and oxidation resistance. Used in furnace parts, exhaust manifolds, turbine components, boiler tubes and engine valves.

Heat Treatment

Normally used in the solution-annealed or precipitation-hardened condition; stabilise/age per the grade (e.g., 650–800 °C ageing). Avoid long exposure in the sigma/475 °C embrittlement ranges.

Precautions

Maintain the recommended heat-treatment envelope; prolonged time in embrittlement ranges reduces ductility. Use descaling/protective atmosphere to limit scaling.

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