Alloy 907 (Incoloy alloy 907) is a nickel-iron-cobalt alloy with additions of niobium and titanium for precipitation hardening. It has the low coefficient of expansion and high strength of alloy 903 but alloy 907 has improved notch-rupture properties at elevated temperatures. Alloy 907 is used for gas turbines components (seals, shafts, casings and other structural parts).
Incoloy 907 Chemical Composition
| Elements | Content (%) |
| Iron, Fe | 42 |
| Nickel, Ni | 38 |
| Cobalt, Co | 13 |
| Niobium, Nb | 4.7 |
| Titanium, Ti | 1.5 |
| Silicon, Si | 0.15 |
| Aluminum, Al | 0.03 |
Incoloy 907 Applications
- Gas turbine seals
- Casings
- Glass to metal sealing
Incoloy 907 Mechanical Properties
| Properties | Metric | Imperial |
| Tensile strength (precipitation hardened, value at room temperature) | 1350 MPa | 196000 psi |
| Yield strength (@ strain 0.200%, precipitation hardened, value at room temperature) | 1100 MPa | 160000 psi |
| Poisson’s ratio | 0.36 | 0.36 |
| Elongation at break (precipitation hardened) | 10% | 10% |
| Reduction of area | 36 | 36 |
Incoloy 907 Machinability
Incoloy 907 can be machined using conventional machining methods which are used for iron-based alloys. Machining operations are performed using commercial coolants. High-speed operations such as grinding, milling or turning, are performed using water-base coolants.
Incoloy 907 Specifications
UNS N19907
Incoloy Alloy 907