AF957

High-Strength

AF957

Secondary-hardening ultra-high-strength steel. (UNS K92718; equiv AF957 / UNS K92718). Nominal values—confirm mill certificate.

Chemical Composition (%)

NI9.5
CO13.5
CR1.8
MO0.9
C0.13

Mechanical Properties

Tensile:≥1515 MPa;Yield:≥1380 MPa

Equivalent Standards

AF957

Applications

二次硬化超高强钢。,Bar

Available Forms

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Cobalt (≈14%) raises hot corrosion and wear resistance. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.

Uses

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

Heat Treatment

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.

Precautions

UNS K92718 AF957 / UNS K92718

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