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S32750 (UNS S32750, DIN 1.4410, ASTM F53) and S32760 (UNS S32760, DIN 1.4501, ASTM F55) are both super duplex stainless steels (SDSS). S32750 was originally developed as SAF2507 in the 1980s by Sandvik. On the other hand, S32760 was originally developed as Zeron 100 by the UK company, Mather & Platt in the 1970s.
As such, their microstructure is a combination of austenitic and ferritic grains, which imparts the most favourable properties of each. Both grades achieve a PREN (Pitting Resistance Equivalent Number) of more than 40 and a minimum yield strength of 80 KSI.
They may appear identical to each other, having similar physical and mechanical properties within the limits of measurement, however, they have some slight differences.
S32750 has a composition of approximately 25% chromium, 7% nickel and 4% molybdenum.
S32760 is very similar to S32750, but also includes small additions of both copper and tungsten which are suggested to improve corrosion resistance in certain environments.
Strength is a crucial factor in the use of super duplex stainless steel. It is appreciably higher than most other stainless steels, and with the high corrosion resistance of super duplex stainless steels makes them a great choice for very many applications.
There is no real difference between S32750 and S32760. There is more likely to be differences between finished sizes (diameters) than there is between compositions, due to the importance of rapid quenching after heat treatment during their production.
Weldability is equivalent. However, selection of the correct welding consumables, specifically filler metals, is vital. The filler metals can be tailored to the individual grades for optimum performance.
At Langley Alloys, we carry an extensive stock of both S32750 and S32760, alongside Ferralium 255 (UNS S32550, DIN 1.4507, ASTM F61) with bars up to 16″ (406.4mm) diameter, plates up to 3″ (76.2mm) thickness, and a variety of pipes and fittings available ex-stock from our warehouses in the UK and USA.
For more information about S32750 and S32760, please contact us today and we will be happy to answer your questions.
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