Valve User Edition 50

Valve User Edition 50

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Duplex Alloys - duplex stainless steel

Here is a link to the latest edition of the Valve User magazine, which includes a feature on Langley Alloys investment in nickel alloy stocks.

As a key supplier to valve manufacturers and their appointed subcontractors, we have been an active member of the British Valve and Actuator Association ( for several years. One of their key activities to encourage networking amongst members across the supply chain, and raise the profile of manufacturing, is their periodical publication. Each edition of Valve User contains a feature from Langley Alloys. In previous publications we have discussed the history of super duplex stainless steels and the invention of Ferralium 255; the 80th anniversary of Langley Alloys; the addition of Sanmac 316L and Sanmac 2205 duplex stainless steel hollow bar to our range, and our ability to support pipe, fitting and flange packages.

In the latest edition, just published, we draw attention to our stock of alloy 825 and Alloy 925. Alloy 825 (Incoloy 825, UNS N08825, 2.4858) is the more commonly known alloy in the valve market, and Langley Alloys has already supplied a number of BVAA members with packages of solid bar for the machining of various components. It can be used at temperatures of up to 540degC and the various additions to its composition provides good resistance to a number of acids, oxidation and general corrosion. It can be readily machined, but its strength is relatively low compared with super duplex and other nickel alloys.

Alloy 925 (Incoloy 925, UNS N09925) is perhaps less widely known in the valve market, although it is increasingly widely specified by leading companies for the production of Oil & Gas tooling and components. It is largely similar to Alloy 825 in terms of composition, therefore its general properties, corrosion resistance and temperature operating range are near identical. However, it was developed to provide significantly higher strengths. Its mechanical properties are comparable with the most widely specified nickel alloy, Alloy 718, but the lower nickel content means that it is significantly lower cost. Unless the operating conditions demand the more highly-alloyed 718 grade then many clients are now choosing to switch specification to Alloy 925.


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