What is super duplex material?

Super duplex is ‘shorthand’ for a family of high-performance stainless steels based around a 25% chromium content. As the duplex name suggests, they have a microstructure made up from both austenitic and ferritic grains, which provides their unique combination of physical and mechanical properties. The original super duplex stainless steel, Ferralium 255, was developed by Langley Alloys in the 1960’s. A number of other grades have subsequently been developed.

The term ‘Super-Duplex’ was first used in the 1980s to describe highly alloyed, high-performance Duplex steel with a pitting resistance equivalent of >40.

With its high level of chromium, Super-Duplex steel provides superb resistance to acids, acid chlorides, caustic solutions and other environments in the chemical/petrochemical, pulp and paper industries.

Super duplex materials are typically used in applications such as pumps, valves, fasteners, pipework, connectors, plus oil and gas components.

Langley Alloys stocks the most complete range of super duplex material, including solid bars up to 16” (406.2mm) diameter, plate up to 3” thickness, plus access to pipes, flanges and fittings through our supply chain.

These are available in Ferralium 255 (UNS S32550, F61), SAF2507 (UNS S32750, F53) and S32760 (F55, Zeron 100).

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For more information about super duplex materials, please don’t hesitate to contact us today. We would be happy to answer any questions that you may have regarding specifications and common applications.

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