Inconel 718
Inconel 718 is a nickel based high temperature alloy containing about 53% nickel, 17% to 21% chromium, 18.5% to 21% iron, 4.75% to 5.5% niobium, and 2.8% to 3.3% molybdenum, with smaller amounts of titanium and aluminum. The source reports high strength from -253℃ to 700℃, resistance to seawater, chlorides, and organic acids, plus oxidation and fatigue resistance. These properties support structural parts used under high temperature, pressure, and corrosive conditions in aerospace, energy, and chemical processing.
Product details
Chemical composition
| inconel718 | C | Si | Mn | P | S | Ni | Cr | Mo | Co | Fe | Ti | Al | Cu | Nb | Nb+Ta |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 50.0 | 17.0 | 2.8 | – | – | 0.65 | 0.2 | – | 0.5 | 4.75 |
| max | 0.08 | 0.35 | 0.35 | 0.015 | 0.015 | 55.0 | 21.0 | 3.3 | 1.0 | Bal | 1.15 | 0.8 | 0.3 | 2.5 | 5.5 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| inconel718 Alloy 718 | N07718 | 2.4668 | NCF718 | GH169 GH4169 | NC19FeNb Ni53Cr19Mo3TiNb |
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Physical properties
| Density g/cm³ | 8.22 |
|---|---|
| Melting range ℃ | 1260-1340 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 11.4 |
| Specific heat J/kg•℃ | 435 |
| Elastic modulus GPa | 207 |
| Electrical resistivity μΩ•m | 1.29 |
| Linear expansion coefficient a/10-6℃-1 | 13.3(20~100℃) |
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Mechanical properties
| Tensile strength Rm N/mm | ≥1240 |
|---|---|
| Yield strength RP0.2 N/mm | ≥1034 |
| Elongation % | ≥12 |
| Hardness HB | 363-429 |
| *After aging heat treatment | |
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Applications
- Turbine discs in turbine engines
- Rocket-engine thrust chambers and fasteners
- Blowout-preventer components for deep-sea oil and gas production
- Piping in hydrocracking units
- Nozzles in acidic waste-gas treatment systems
- Semiconductor-wafer fixtures
- Racing-engine components
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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