N09925 is the Unified Numbering System (UNS) designation for a nickel-based alloy most commonly known as Incoloy 925. The UNS system was created by a number of trade groups working together in the 1970’s, to reduce confusion from the same alloy being called different things or vice-versa. Each metal is indicated by a letter followed by five numbers, where the letter indicates the family of metals i.e. N for nickel-based alloys.
Incoloy 925 (UNS N09925) is a precipitation-hardened version of Incoloy 825. Based upon the same Nickel-Iron-Chromium composition, Titanium and Aluminium are specifically added to give a strengthening of the alloy during ageing. Its physical properties are consistent with Incoloy 825 (Alloy 825, UNS N08825, 2.4858) and as a nickel-based alloy it is resistant to stress corrosion cracking.
Due to it’s very high strength levels it is being selectively used as an alternative to Alloy 718 (Inconel 718, UNS N07718, 2.4668), as it can provide a significant cost saving. Alloy 925 is particularly suited to down-hole applications in sour gas wells , but can also be used in less aggressive applications as it resists general, pitting, crevice and stress corrosion cracking in most aqueous environments where chloride or sulphide ions may be present.
Incoloy and Inconel are registered trademarks of Special Metals Inc.
Langley Alloys carries a significant stock of Alloy 925 solid bar, from 3” up to 9” in a large number of incremental sizes.
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