Alloy 925 INCOLOY® 925 – UNS N09925 / ASTM B805, B564
Alloy 925 INCOLOY® 925
Alloy 925 INCOLOY® 925 is a precipitation-hardenable nickel -iron-chromium alloy with additions of molybdenum, copper, titanium, and aluminum. This alloy is designed to offer an excellent combination of mechanical strength and corrosion resistance .
Nickel provides resistance to chloride-induced stress corrosion cracking, while the combination of nickel, molybdenum, and copper ensures excellent resistance to reducing environments. Molybdenum improves resistance to pitting and crevice corrosion, while chromium offers protection against oxidizing environments. The elements titanium and aluminum enable precipitation hardening, increasing the alloy’s mechanical strength.
Due to its resistance to sulfide corrosion and stress corrosion cracking in environments containing hydrogen sulfide (H₂S), the alloy is widely used in the Oil & Gas industry for the production of tubulars, valves , joints, packers and deep well components.
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Reference standards:
- ASTM B805 (bars and wires)
- ASTM B564 (flanges and forgings)
- ASME Code Case 2218 (Pressure Applications)
- NACE MR0175 (corrosion resistance in acidic environments)
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 42.0 – 46.0 |
| Iron (Fe) | 22.0 min |
| Chromium (Cr) | 19.5 – 22.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 1.9 – 2.4 |
| Aluminum (Al) | 0.1 – 0.5 |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 0.5 max |
| Niobium (Nb) | 0.5 max |
| Carbon (C) | 0.03 max |
| Sulfur (S) | 0.03 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: 980-1040°C for 30 min – 4 h, with air cooling or more rapid.
- Aging: 732-749°C for 6-9 h, controlled cooling to 621°C, held for 18 h, followed by air cooling.
- Hot forming: Temperature range between 870 and 1175°C, with controlled cooling.
Available formats
INCOLOY® Alloy 925 is available in the following forms:
Industrial applications
Thanks to its combination of high mechanical strength and corrosion resistance, INCOLOY® 925 is used in the following sectors:
- Aerospace and Defense: Structural Components for Extreme Environments.
- Power Generation: Heat Exchangers and High Pressure Piping Systems.
- Chemical and Pharmaceutical Industry: Components for aggressive chemical systems.
- Motorsport: Corrosion-resistant racing engine parts.
- Nuclear: Structures and piping for environments with high radioactive content.
- Oil & Gas: Components for subsea wells, piping for acidic and highly corrosive environments, joints and valves for drilling.
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