18Ni(350)

High-Strength

18Ni(350)

Ultra-high-strength / maraging steel 18Ni(350).

Chemical Composition (%)

NI17
CO8
MO3
TI0.1
C0.03

Mechanical Properties

Tensile:≥2000 MPa;Yield:≥1900 MPa;Elongation:≥8%

Equivalent Standards

Maraging 18Ni(350)

Applications

Aerospace, tooling, fasteners

Available Forms

Bar,Forging

Uses

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Cobalt (≈10.5%) 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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