INCOLOY® alloy 945 (UNS N09945) is a high-strength, corrosion-resistant alloy designed for demanding applications in the oil and gas industry. The properties of this age hardenable nickel-iron-chromium alloy are enhanced by its contents of molybdenum, copper, niobium, titanium, and aluminum. The alloy's nickel content results in resistance to chloride-induced stress corrosion cracking. Nickel, in conjunction with the molybdenum and copper, also gives alloy 945 outstanding resistance to general corrosion in reducing media. Molybdenum also imparts resistance to localized attack (pitting and crevice corrosion). The alloy's content of chromium provides resistance in oxidizing environments. Niobium, titanium and aluminum participate in the age hardening reaction that occurs during heat treatment. Their interaction forms gamma prime and gamma double prime precipitates, which strengthen the alloy.

INCOLOY alloy 945 is suitable for downhole oil and gas applications requiring high strength and corrosion resistance in aggressive sour wells containing high levels of hydrogen sulfide and chorides. Because of the alloy's resistance to stress cracking in environments rich in hydrogen sulfide, it is suitable for downhole and surface gas-well components including tubular products, valves, hangers, landing nipples, tool joints and packers. The alloy can also be used for fasteners, pump shafting and high strength piping systems.

INCOLOY alloy 945 is approved under NACE MR0175 / ISO 15156-3 for use in oil and gas applications up to NACE level VII and level VI-450°F severity.

INCOLOY alloy 945 products are available in several strength grades. Conventional annealed and aged alloy 945 products exhibit a minimum yield strength of 125 ksi. A high strength grade of the alloy, designated INCOLOY alloy 945X, exhibits a minimum yield strength of 140 ksi. The strength of alloy 945X is also higher than that of alloys 718, 725, and 925. In addition, cold worked and directed aged products are available with even higher levels of strength for applications such as shafting.

Limiting properties of alloy 945 products are defined in specifications prepared by Special Metals Corporation, the inventor and producer of the product. These include HA 119, HA 121, HA 122 and HA 123. Copies are available by contacting the Special Metals Research and Technology Department.