Inconel 625 excels in corrosion resistance and is solid-solution strengthened for weldability. Inconel 718 offers much higher strength through precipitation hardening and is the workhorse for jet engine and rocket components.
| Property | Inconel 625 | Inconel 718 |
|---|---|---|
| Tensile Strength | 827 MPa (120 ksi) | 1,241 MPa (180 ksi) |
| Yield Strength | 414 MPa (60 ksi) | 1,034 MPa (150 ksi) |
| Hardness | 175 HB | 36 HRC |
| Density | 8.44 g/cm³ | 8.19 g/cm³ |
| Machinability Rating | 12/100 | 12/100 |
| Thermal Conductivity | 9.8 W/m·K | 11.4 W/m·K |
| Melting Point | 1,290–1,350 °C | 1,260–1,336 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
| Property | Inconel 625 | Inconel 718 | Winner |
|---|---|---|---|
| Tensile Strength | 827 MPa | 1,241 MPa | Inconel |
| Max Service Temp | 982°C | 704°C | Inconel |
| Corrosion Resistance | Superior | Excellent | Inconel |
| Weldability | Good | Moderate | Inconel |
| Machinability | 12/100 | 12/100 | Tie |
| Age Hardenable | No | Yes | Inconel |
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