Alloy 925 is a nickel-based alloy with major additions of iron and chromium, but also molybdenum, copper, titanium, and aluminum. The combination of high strength and corrosion resistance makes it suitable for applications such as valves, hangers, packers and pipes in sour gas environments. It can also be used for fasteners and pump shafts in marine environments.
The combination of nickel and chromium provides protection in both oxidizing and reducing atmospheres. The high nickel content also provides resistance to chloride ion stress corrosion cracking. Resistance to pitting and crevice corrosion is also excellent. The alloy is produced by a vacuum remelting process, but can be supplied using an air melting single-consumer electrode (VAR or ESR) practice if material specifications permit.