Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged vs Inconel 740 (Ni-25Cr-20Co-2Nb-2Ti) aged
Property comparison of Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged and Inconel 740 (Ni-25Cr-20Co-2Nb-2Ti) aged, both nickel alloy.
| Property | Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged | Inconel 740 (Ni-25Cr-20Co-2Nb-2Ti) aged | Difference |
|---|---|---|---|
| Yield strength | 827 MPa | 818 MPa | -1% |
| Tensile strength | 1,034 MPa | 1,209 MPa | +17% |
| Elongation | 20 % | 36 % | +80% |
| Elastic modulus | 204,000 MPa | 221,000 MPa | +8% |
| Density | 8,310 kg/m³ | 8,050 kg/m³ | -3% |
| Thermal conductivity | 10.6 W/m·K | 10.2 W/m·K | -4% |
| Coefficient of thermal expansion | 0.000013 1/K | 0.000012 1/K | -5% |
| Melting point | 1,343 °C | 1,362 °C | +1% |
Difference is Inconel 740 (Ni-25Cr-20Co-2Nb-2Ti) aged relative to Inconel 725 (Ni-22Cr-7Mo-3.5Nb-2Fe) aged. 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
- N07725
- standard
- Langley Alloys Alloy 725 datasheet (UNS N07725); Special Metals tech bulletin INCONEL alloy 725
- heat treatment
- solution annealed + aged
- grade
- N07740
- standard
- Special Metals Corp. tech bulletin INCONEL alloy 740; AZoM ArticleID 9446
- heat treatment
- precipitation hardened
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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