Alloy 725 INCONEL® 725 – UNS N07725 / ASTM B805, B564
Alloy 725 INCONEL® 725
Alloy 725 INCONEL® 725 is a nickel -chromium-molybdenum-niobium alloy designed to offer high corrosion resistance and age-hardening properties, giving it exceptional mechanical strength . Its corrosion resistance is equal to that of INCONEL® 625, but precipitation hardening allows it to achieve mechanical strength nearly double that of the annealed version of INCONEL® 625.
Unlike other cold-work strengthened alloys, INCONEL® 725 retains excellent ductility and toughness, making it ideal for high-stress components and extreme corrosive environments. The alloy is particularly suited for acidic environments containing hydrogen sulfide (H₂S), chlorides, and carbon dioxide, such as those found in natural gas wells and offshore applications.
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Reference standards:
- ASTM B805 (bars and wires)
- ASTM B564 (flanges and forgings)
- ASME Code Case 2217 (Bars and Forgings for High-Pressure Applications)
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 55.0 – 59.0 |
| Chromium (Cr) | 19.0 – 22.5 |
| Molybdenum (Mo) | 7.0 – 9.5 |
| Niobium (Nb) | 2.75 – 4.0 |
| Titanium (Ti) | 1.0 – 1.7 |
| Aluminum (Al) | 0.35 max |
| Iron (Fe) | Balanced |
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.20 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.010 max |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 1254 | 892 | 32 |
| 300 | 1189 | 826 | 30 |
| 600 | 1099 | 782 | 32 |
| 900 | 1075 | 807 | 31 |
Heat treatments
- Solution annealing: 1040°C with air cooling to maintain an optimal structure.
- Aging: 730°C for 8 hours, controlled cooling to 620°C for 8 hours, followed by air cooling.
- Hot forming: Working temperature between 900 and 1120°C, with gradual cooling to avoid double grain structures.
Available formats
INCONEL® Alloy 725 is available in the following forms:
Industrial applications
Thanks to its unique combination of mechanical strength and corrosion resistance, INCONEL® 725 is used in:
- Aerospace and Defense: Structural Components for Extreme Environments.
- Power Generation: Heat Exchange Systems in High Temperature Plants.
- Chemical and Pharmaceutical Industry: Components for reactors, piping and tanks in acidic environments.
- Motorsport: High-performance engine parts exposed to corrosive gases.
- Nuclear: Structural materials for aggressive radioactive environments.
- Oil & Gas: High-pressure, high-temperature well instrumentation, resistance to sulfide corrosion and chloride-induced stress corrosion cracking.
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