GH4738

High-Temp Steel

GH4738

GH4738 Ni-base age-hardening superalloy. (GB/T 14992; equiv GB GH4738). Nominal values—confirm mill certificate.

Chemical Composition (%)

CR19
CO12
MO3.5
AL1.3
TI2.8

Mechanical Properties

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

Chinese Standard

T 14992 GH4738

Equivalent Standards

GB GH4738

Available Forms

Forging,Bar

Uses

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Cobalt (≈13.5%) raises hot corrosion and wear resistance. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.

Heat Treatment

Solution treated 1050–1250 °C and aged (≈700–900 °C) to precipitate γ′/γ″ strengtheners; processed via vacuum induction + VAR/ESR for cleanliness.

Precautions

Machining is difficult — use ceramic/PCBN tools, generous coolant and rigid setups. Keep clean (vacuum/inert melting) to avoid inclusions; avoid contamination by low-melting elements.

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