INCONEL® alloy 625 is a corrosion resistant nickel-chromium-molybdenum alloy. It is doped with niobium, which interacts with the molybdenum to provide high strength without additional heat treatment.
Chemical composition
| Composition |
ASTM B446 |
| Nickel | 58.00 min |
| Molybdenum | 8.00 - 10.00 |
| Sulfur | 0.015 max |
| Silicon | 0.50 max |
| Chromium | 20.00 - 23.00 |
| Niobium + Tantalum | 3.15 - 4.15 |
| Titanium | 0.40 max |
| Aluminum | 0.40 max |
| Iron | 5.0 max |
| Manganese | 0.50 max |
| Carbon | 0.10 max |
| Phosphorus | 0.015 max |
Physical properties
| Metric | English | |
| Density | 8.44 g/cm³ | 0.305 lbs/in³ |
| Modulus of elasticity | 207 MPa | 30.1 Mpsi |
| Electrical resistivity | 1.29 µohm*m | 50.8 µohm*in |
| Thermal conductivity | 9.8 W/(m*°C) | 68 BTU*in/(hr*ft²*°F) |
| Coefficient of thermal expansion | 12.8 µm/(m*°C) | 7.1 µin/(in*°F) |
*Values calculated at 22 °C [72 °F]
Mechanical properties
| Cold worked % |
Yield strength |
Ultimate tensile strength |
Elongation |
| 0 | 820 MPa [119 ksi] | 1165 MPa [169 ksi] | 36 |
| 20 | 1200 MPa [174 ksi] | 1496 MPa [217 ksi] | 6.1 |
| 37 | 1407 MPa [204 ksi] | 1751 MPa [254 ksi] | 3.3 |
|
50 |
1600 MPa [232 ksi] | 1889 MPa [274 ksi] | 3.2 |
|
60 |
1737 MPa [252 ksi] | 1993 MPa [298 ksi] | 2.1 |
|
68 |
1820 MPa [264 ksi] | 2055 MPa [298 ksi] | 2.1 |
|
75 |
1924 MPa [279 ksi] | 2144 MPa [311 ksi] | 2.3 |
|
* Values are typical and may not represent all diameters. Test method will affect results. |
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