EP718

High-Temp Steel

EP718

Precipitation-hardening Ni-base superalloy, aerospace workhorse. (GOST 5632; equiv UNS N07718 / AMS 5662 / GB 0Cr17Ni21Mo10Nb). Nominal values—confirm mill certificate.

Chemical Composition (%)

NI50
CR17
NB4.75
MO2.8
TI0.65
AL0.2

Mechanical Properties

Tensile:≥1275 MPa;Yield:≥1035 MPa;Elong:≥12%

Chinese Standard

GOST 5632 EP718

Equivalent Standards

AMS 5662

Equivalent Grades

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.

Applications

沉淀硬化镍基，航空主力。,"Bar

Available Forms

Forging

Uses

Plate"

Heat Treatment

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.

Precautions

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

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