S32750 and S32760 are both super duplex stainless steels (SDSS). Their microstructure combines austenitic and ferritic grains, giving the most favourable properties of each. Both are based on a 25% chromium content (25Cr), and the differences in their mechanical properties, physical properties and composition are small. They can often be substituted for one another, subject to customer specifications.
History of S32750 and S32760
S32750 (UNS S32750, DIN 1.4410, ASTM F53) was originally developed as SAF2507 in the 1980s by Alleima.
S32760 (UNS S32760, DIN 1.4501, ASTM F55) was originally developed as Zeron 100® by the UK company Mather & Platt in the 1970s. It has a slightly higher copper and tungsten content than S32750. The Zeron 100 trademark is now held by Rolled Alloys Inc.
Both grades achieve a PREN (pitting resistance equivalent number) of more than 40, and a minimum yield strength of 80ksi.
Availability
We carry an extensive stock of both grades, 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 range of pipes and fittings available ex-stock from our warehouses in the UK and USA.