Alloy 925 (UNS N09925) is a precipitation-hardened version of Alloy 825. Built on the same nickel-iron-chromium composition, it adds titanium and aluminium to strengthen the alloy during ageing. Its physical properties are consistent with Alloy 825 (UNS N08825, 2.4858), and as a nickel-based alloy it resists stress corrosion cracking.
Its very high strength means it is increasingly used as an alternative to Alloy 718 (UNS N07718, 2.4668), where it can provide a significant cost saving. Alloy 925 is particularly suited to down-hole applications in sour gas wells, and it also serves less aggressive applications, resisting general, pitting, crevice and stress corrosion cracking in most aqueous environments where chloride or sulphide ions may be present.
Incoloy® 925 carries the Unified Numbering System (UNS) designation N09925. The UNS system was created by a group of trade bodies in the 1970s to reduce confusion from one alloy being called different things, or different alloys sharing a name - each metal is shown by a letter followed by five numbers, with N indicating the nickel-based alloy family.
We carry significant stock of Alloy 925 solid bar, from 3" up to 9" in a wide range of incremental sizes.