BÖHLER L925 (UNS N09925) is an age hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminum. The alloy’s chemical composition is designed to provide a combination of high strength and excellent corrosion resistance. The nickel content is sufficient for protection against chloride-ion stress corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing chemicals. The molybdenum aids resistance to pitting and crevice corrosion. The alloy’s chromium content provides resistance to oxidizing environments. Titanium and aluminium form part of the precipitation hardening reaction that greatly increases hardness and strength of the alloy during heat treatment.
The alloy has a high level of corrosion resistance in H2S and CO2 environments and resists general corrosion, pitting, crevice, intergranular corrosion and stress corrosion cracking. It is particularly useful in sour (H2S containing) crude oil, natural gas, sulphuric acid, phosphoric acid and seawater. BÖHLER L925 offers high strength and can be used in high temperatures as it maintains strength at elevated temperatures. BÖHLER L925 meets the requirements of NACE MR0175 and API 6A CRA for sour service applications and is suitable for sour service and can be used for pressure containing and pressure controlling equipment in corrosive environments. Typical applications include packers, safety valves, pumps, hangers, connectors, fasteners and multiple downhole and surface applications.