K417

High-Temp Steel

K417

K417 Ni-base cast superalloy. (GB/T 14992; equiv GB K417). Nominal values—confirm mill certificate.

Chemical Composition (%)

CR8.5
CO14
W2.5
AL4.8
TI4.5

Mechanical Properties

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

Chinese Standard

T 14992 K417

Equivalent Standards

GB K417

Available Forms

Cast

Uses

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Cobalt (≈15%) 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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