Valve User Edition 50

As a key supplier to valve manufacturers and their subcontractors, we have been an active member of the British Valve and Actuator Association (BVAA) for several years. Its periodical publication encourages networking across the supply chain and raises the profile of manufacturing, and each edition of Valve User carries a feature from Langley Alloys. Previous editions have covered the history of super duplex stainless steels and the invention of Ferralium^® 255; our 80th anniversary; 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.

Alloy 825

Alloy 825 (Incoloy 825, UNS N08825, 2.4858) is the more familiar of the two in the valve market, and we have already supplied a number of BVAA members with packages of solid bar for machining various components. It can be used at temperatures up to 540degC, and the additions to its composition give good resistance to a range of acids, oxidation and general corrosion. It machines readily, though its strength is relatively low compared with super duplex and other nickel alloys.

Alloy 925

Alloy 925 (Incoloy 925, UNS N09925) is perhaps less well known in the valve market, but it is increasingly specified by leading companies for oil and gas tooling and components. It is largely similar to Alloy 825 in composition, so its general properties, corrosion resistance and operating temperature range are near identical - but it was developed to provide significantly higher strength. Its mechanical properties are comparable with Alloy 718, the most widely specified nickel alloy, while its lower nickel content makes it significantly cheaper. Unless conditions demand the more highly alloyed 718, many clients are now switching specification to Alloy 925.