What is the difference between S32750 and S32760?

S32750 and S32760 are both super duplex stainless steels (SDSS). As such, their microstructure is a combination of austenitic and ferritic grains, which imparts the most favourable properties of each. They are based upon a 25% chromium content (25Cr), but differences in their mechanical properties, physical properties and composition are small.

S32750 (UNS S32750, DIN 1.4410, ASTM F53) was originally developed as SAF2507  in the 1980s by Sandvik.

S32760 (UNS S32760, DIN 1.4501, ASTM F55) was originally developed as Zeron 100 by the UK company Mather & Platt in the 1970s. It contains a slightly higher copper and tungsten content compared with S32750.

Both grades achieve a PREN (pitting resistance equivalent number) of more than 40, and a minimum yield strength of 80ksi.

Langley Alloys carries an extensive stock of both these SDSS, alongside Ferralium 255 (UNS S32550, DIN 1.4507, ASTM F61) 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.

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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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