Inconel 718
Quick answer
Inconel 718 is a nickel superalloy specified by AMS 5663, AMS 5664, ASTM B637, UNS N07718. Typical composition: .
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 |
|---|---|---|---|
| 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
Frequently asked questions
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