Ultimet

High-Temp Steel

Ultimet

Specialty steel grade. orrosion-resistant alloy. (UNS R31233; equiv Ultimet / UNS R31233). Nominal values—confirm mill certificate.

Chemical Composition (%)

CR27
W4
C0.9
FE3

Mechanical Properties

Hardness:≥40 HRC

Applications

钴基耐磨损耐热合金。,Plate

Available Forms

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.

Uses

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.

Heat Treatment

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

Precautions

UNS R31233 Ultimet / Ultimet / UNS R31233

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