K418

High-Temp Steel

K418

K418 Ni-base cast superalloy, turbine blades. (GB/T 14992; equiv GB K418 / K3? (cast)). Nominal values—confirm mill certificate.

Chemical Composition (%)

CR11.5
CO1
MO3.8
AL0.5
TI0.6

Mechanical Properties

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

Chinese Standard

T 14992 K418

Equivalent Standards

GB K418

Equivalent Grades

K3? (cast)

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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