Inconel 718

High-Temp Steel

Inconel 718

Precipitation-hardenable nickel superalloy for turbine disks, cryogenic and high-temperature service.

Chemical Composition (%)

NI50
CR17
NB+TA4.75
MO2.8
TI0.65
AL0.2
C0.08
MN0.35
SI0.35
P0.015
S0.015
B0.006

Mechanical Properties

Tensile:≥1275 MPa;Yield:≥1035 MPa;Elong:≥12%;Hardness:≥36 HRC

Chinese Standard

T 14992 GH4169

Equivalent Standards

AMS 5662

Equivalent Grades

Inconel 718 / UNS N07718

Applications

Turbine disks, cryogenic tanks, engine & aerospace structural parts.

Available Forms

Bar, Forging, Sheet, Wire

Uses

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. 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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