Materials
for demanding applications
Inconel® Alloy 718
Inconel® Alloy 718 is a nickel-based age-hardenable alloy that possesses high strength at elevated temperatures.
Chemical composition
| Composition | UNS N07718 % |
| Nickel | 50.00 - 55.00 |
| Iron | Balance |
| Chromium | 17.00 - 21.00 |
| Niobium + Tantalum | 4.75 - 5.50 |
| Molybdenum | 2.80 - 3.30 |
| Titanium | 0.65 - 1.15 |
| Aluminum | 0.20 - 0.80 |
Physical properties
| Metric | English | |
| Density | 8.19 g/cm³ | 0.296 lbs/in³ |
| Modulus of elasticity | 145 GPa | 21 MPsi |
| Electrical resistivity | 1.27 µohms/m | 764 µohms/ft |
| Thermal conductivity | 11.4 W/m-K | 79.1 Btu-in/ft²hr-°F |
Mechanical properties
| Cold worked % | Yield strength | Ultimate tensile strength | Elongation % |
| 0 | 655 MPa [95 ksi] | 876 MPa [127 ksi] | 47 |
| 20 | 910 MPa [132 ksi] | 1138 MPa [165 ksi] | 2.2 |
| 37 | 1076 MPa [156 ksi] | 1310 MPa [190 ksi] | 2.5 |
| 50 | 1317 MPa [191 ksi] | 1538 MPa [223 ksi] | 1.9 |
| 60 | 1420 MPa [206 ksi] | 1669 MPa [242 ksi] | 2.2 |
| 68 | 1462 MPa [212 ksi] | 1744 MPa [253 ksi] | 2.4 |
| 75 | 1510 MPa [219 ksi] | 1813 MPa [263 ksi] | 2.9 |
| 80 | 1600 MPa [232 ksi] | 1889 MPa [274 ksi] | 2.4 |
| 84 | 1565 MPa [227 ksi] | 1931 MPa [280 ksi] | 2.7 |
| 87 | 1675 MPa [243 ksi] | 2013 MPa [292 ksi] | 2.7 |
| 90 | 1662 MPa [241 ksi] | 2048 MPa [297 ksi] | 2.8 |
| 92 | 1737 MPa [252 ksi] | 2096 MPa [304 ksi] | 2.7 |
All data represent results from a 25.4 cm [10 in] test gauge length. Values are typical and may not represent all diameters. Test method will affect results.