Inconel 718

UNS N07718 nickel_superalloy
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Precipitation-hardened nickel-chromium alloy with excellent strength to 700 °C. The most widely used superalloy in aerospace turbine discs and life-limited parts. Primary scrap alloy in aerospace MRO.

Applicable Standards

  • AMS 5663
  • AMS 5664
  • ASTM B637
  • UNS N07718

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Ni 50.0 55.0 ~52.5
Cr 17.0 21.0 ~19.0
Fe 14.0 21.0 ~17.5
Mo 2.8 3.3 ~3.05
Nb 4.75 5.5 ~5.12
Ti 0.65 1.15 ~0.9
Al 0.2 0.8 ~0.5
Co — 1.0 ~0.5
Ni 50.0–55.0% Cr 17.0–21.0% Fe 14.0–21.0% Mo 2.8–3.3% Nb 4.75–5.5% Ti 0.65–1.15% Al 0.2–0.8% Co 0.0–1.0%

Typical Applications

  • Turbine discs
  • Compressor blades
  • Fasteners
  • Cryogenic tanks
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