2.1504 is the Werkstoff number for a copper nickel alloy most commonly known as Hiduron 130. The Werstoff designation was developed by the German standards body DIN, with the term Werkstoff translating approximately to ‘material’.
Hiduron 130 was originally known as Hidurax Special, and it was specifically developed by Langley Alloys as a high-strength, corrosion-resistant alloy for naval applications such as seals, shafts, control planes for submarines and winch components. Aluminium is the key strengthening element for Hiduron 130 (2.1504, DTD 900/4805, C72400, CuNi14Al3) through the formation of finely dispersed ϒ’ nickel aluminium precipitate, strengthening the alloy in a similar way to Alloy K-500. As these precipitates are formed through a carefully controlled forging process, naturally aged during cooling, no further heat treatment is necessary, making it one of the highest strength copper alloys commercially available.
The development of offshore oil and gas exploration has led to Hiduron 130 finding applications beyond the original naval (and aerospace) applications. High strength and resistance to fouling are obviously of benefit in subsea applications, but the galling resistance has been particular relevant in subsea connectors and stab plates. The physical and mechanical properties of Hiduron 130, together with its resistance to fouling, make it well-suited to wet-mate electrical and hydraulic connectors which need to operate for extended periods before requiring immediate and safe disconnection.
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