Inconel 718 vs Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged
Property comparison of Inconel 718 and Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged, both nickel alloy.
| Property | Inconel 718 | Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged | Difference |
|---|---|---|---|
| Yield strength | 1,036 MPa | 827 MPa | -20% |
| Tensile strength | 1,240 MPa | 1,034 MPa | -17% |
| Elongation | 12 % | 20 % | +67% |
| Elastic modulus | 211,000 MPa | 204,000 MPa | -3% |
| Poisson ratio | 0.29 | 0.31 | +7% |
| Density | 8,220 kg/m³ | 8,310 kg/m³ | +1% |
| Thermal conductivity | 11.4 W/m·K | 10.6 W/m·K | -7% |
| Specific heat | 435 J/kg·K | 430 J/kg·K | -1% |
| Coefficient of thermal expansion | 0.000013 1/K | 0.000013 1/K | 0% |
| Melting point | 1,336 °C | 1,343 °C | +1% |
| Reduction in area | 15 % | 35 % | +133% |
Difference is Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged relative to Inconel 718. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- N07718
- standard
- Special Metals Corp. tech bulletin INCONEL alloy 718 (SMC-045); AMS 5663
- heat treatment
- solution annealed + double aged (720C/8h + 620C/8h)
- grade
- N07725
- standard
- Langley Alloys Alloy 725 datasheet (UNS N07725); Special Metals tech bulletin INCONEL alloy 725
- heat treatment
- solution annealed + aged
About Inconel nickel-chromium superalloys
Inconel is a family of nickel-chromium-iron superalloys. They keep strength at temperatures where steels and most stainless grades have failed and resist oxidation and hot corrosion. Inconel 718 is the most widely used grade for aerospace turbine disks and high-temperature fasteners; Inconel 625 is the choice when chloride and reducing-acid corrosion both matter.
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