18Ni(400)
High-Strength18Ni(400)
Ultra-high-strength / maraging steel 18Ni(400).
Chemical Composition (%)
| NI | 17 |
|---|---|
| CO | 8 |
| MO | 3 |
| TI | 0.1 |
| C | 0.03 |
Mechanical Properties
Tensile:≥2000 MPa;Yield:≥1900 MPa;Elongation:≥8%
Equivalent Standards
Maraging 18Ni(400)
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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