GH1140

High-Temp Steel

GH1140

GH1140 Ni-base solid-solution strengthened superalloy. (GB/T 14992; equiv GB GH1140). Nominal values—confirm mill certificate.

Chemical Composition (%)

CR20
W1.4
MO2

Mechanical Properties

Tensile:≥690 MPa;Yield:≥280 MPa;Elong:≥25%

Chinese Standard

T 14992 GH1140

Equivalent Standards

GB GH1140

Available Forms

Bar,Strip

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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