Incoloy 925 forgings are high-quality corrosion-resistant parts from a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. Forged specifically for sour gas, marine, and chemical processing applications, these forgings provide a superior strength and corrosion resistance in an ideal package. Incoloy 925 has age-hardenability, which enables it to have excellent strength-to-weight ratios and dimensional stability. These forgings find their applications in those applications, which have high pressure and stress and require resistance to sulfide stress cracking, pitting, and general corrosion, like offshore drilling, heat exchangers, and downhole tools.
Incoloy 925 contains about 42–46% nickel, 19.5–23.5% chromium, 22% iron, 2.5–3.5% molybdenum, 1.5–3% copper, and titanium. It attains tensile strengths of up to 800–950 MPa and yield strengths of about 600–700 MPa following age hardening. The alloy demonstrates strong resistance to sulfide stress cracking and pitting in chloride-rich or sour gas environments. Forgings of Incoloy 925 retain good fatigue strength, toughness, and accuracy in dimensions. It is strengthened by heat treatment, increasing hardness and corrosion resistance without sacrificing formability or weldability.
Specifications ASTM B637 / ASME SB637
Flat bar blocks up to 27″ width and 15,000 lbs.
Cylinders and sleeves up to 50″ maximum O.D. and 65″ maximum length
Discs and hubs up to 50″ diameter and 20,000 lbs.
Rolled, hand forged or mandrel forged rings up to 84″ maximum O.D. and 40″ maximum length
Rounds, shafts and step shafts up to 144″ maximum length and 20,000 lbs.
| Grade | Ni% | Cr% | Fe% | Mo% | Cu% | Ti% | Al% | Mn% | Si% | Nb% | C% | S% |
| Incoloy 925 | 42.0-46.0 | 19.5-22.5 | Min 22 | 2.5-3.5 | 1.5-3.0 | 1.9-2.4 | 0.1-0.5 | Max 1.0 | Max 0.5 | Max 0.5 | Max 0.03 | Max 0.03 |
| UNS | Heat Treatment | Tensile Strength, min, psi (MPa) | Yield Strength (0.2 % offset), min, psi (MPa) | Elongation in 2 in. (50 mm) or 4D, min, % | Reduction of Area, min, % | Brinell or (Rockwell C) Hardness |
| ASTM B637 UNS N09925 | solution + precipitation harden | 140 000 (965) | 105 000 (724) / 110 000 (758) | 18 | 25 | 346 max (38, Rc max) |
| STANDARD | UNS | WNR. |
| Alloy 925 | N09925 | – |
The ideal temperature range for forging Incoloy 925 is between 1,800°F (982°C) and 2,200°F (1,204°C). Forging should be done within this range to achieve optimal material properties and avoid overheating.
Incoloy 925 forgings require minimal maintenance due to their excellent corrosion resistance. Regular inspection for signs of wear, cracks, or environmental damage is recommended to ensure long-term performance.
Incoloy 925 forgings have limited high-temperature strength beyond 1,600°F (871°C) and may suffer from reduced ductility in extreme conditions. They also exhibit moderate resistance to pitting and crevice corrosion in highly aggressive environments.
Incoloy 925 forgings find extensive use in offshore oil rigs, subsea tubing hangers, wellhead parts, valves, and sour gas service fasteners. Hydrogen embrittlement and stress corrosion resistance makes them acceptable for downhole tools, drill collars, and casing parts. The chemical industry employs them for pumps, shafts, and valve components that are subject to aggressive acids and alkalis. Power generation plants utilize them as condenser tubes and flue gas systems. Due to their high strength and corrosion resistance, they are suitable for aerospace components and high-performance maritime hardware in brine or sea water conditions.
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