What is S32550?

S32550 is the Unified Numbering System (UNS) designation for the original super duplex stainless steel, best known as Ferralium 255.

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. S for stainless steels.

Ferralium 255 (UNS32550, DIN 1.4507, F61) is the original SDSS, developed by Langley Alloys in the 1960’s. It is still the only super duplex to provide a yield strength >85ksi, whilst it’s increased copper content (2%) ensures greater resistance to acids.

Langley Alloys carries an extensive stock of  Ferralium 255, with bar up to 16″ (406.4mm) diameter, plate up to 3″ (76.2mm) thickness, and a variety of pipes and fittings available ex-stock from our warehouses in the UK and USA.

Got any Questions about S32550? Get in Touch

For more information about high performance stainless steels alloys, 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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