Material Family / InconelDoc. RAS·GRD/INCONEL-718
Inconel 718
Age-hardenable nickel-chromium superalloy for high strength from cryogenic to 650°C.
Introduction
§01 — GeneralInconel 718 is a precipitation-hardenable nickel-chromium alloy with outstanding strength, corrosion resistance and fabricability. It is the workhorse of aerospace turbine components and high-pressure oil & gas hardware.
AMS 5662AMS 5663ASTM B637UNS N07718
Standard Forms
ForgingWireSpring WireBarPlateStrip
Nominal Composition
§02 — Weight % · Typical| Element | Min | Max | Typical |
|---|---|---|---|
| Ni | 50.0 | 55.0 | 52.5 |
| Cr | 17.0 | 21.0 | 19.0 |
| Fe | Bal | Bal | Bal |
| Nb | 4.75 | 5.50 | 5.20 |
| Mo | 2.80 | 3.30 | 3.00 |
| Ti | 0.65 | 1.15 | 0.95 |
| Al | 0.20 | 0.80 | 0.50 |
| C | — | 0.08 | 0.03 |
Typical Mechanical Properties
§03 — Room Temp + Elevated| Temp | UTS | 0.2% YS | Elongation | Hardness |
|---|---|---|---|---|
| Room | 1275 MPa | 1035 MPa | 12% | 38 HRC |
| 540°C | 1105 MPa | 965 MPa | 14% | — |
| 650°C | 860 MPa | 795 MPa | 18% | — |
Physical Properties
§04 — Physical| Property | Value | Note |
|---|---|---|
| Density | 8.19 g/cm³ | at 20°C |
| Melting range | 1260 – 1336°C | solidus–liquidus |
| Thermal expansion | 13.0 μm/m·K | 20–100°C |
| Thermal conductivity | 13.4 W/m·K | at 20°C |
| Specific heat | 435 J/kg·K | at 20°C |
Industries & Uses
§05 — ApplicationsIndustries
AerospaceOil & GasPower GenerationNuclear
Typical Uses
- Turbine discs and rings
- Compressor blades and fasteners
- Subsea wellhead components
- High-temperature springs and bolts
- Cryogenic pressure vessels
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