Super Duplex UNS S32750/S32760

Super Duplex
UNS S32750 / S32760

Stainalloy is highly experienced in the supply of Super Duplex UNS S32750 / S32760 piping materials. For over 25 years Stainalloy has been dealing with Super Duplex and has gained unmatched technical know-how and excellent relations with the leading manufacturers.

Super Duplex UNS S32750 / S32760 is an austenitic-ferritic stainless steel that provides excellent resistance to pitting corrosion & crevice corrosion. The chemical composition, and a high chromium and molybdenum content, ensures high tensile strengths and exhibits high thermal conductivity and low thermal expansion. In both regards the characteristics of Super Duplex UNS S32750 / S32760 outperforms ordinary austenitic stainless steels.

Stainalloy supplies, worldwide, large sized (Super)-Duplex piping packages required for oil & gas-producing and –processing industry. Stainalloy also services also medium-small Super Duplex UNS S32750 / S32760 piping packages from stock during the advanced construction stages when short lead times are required. Super Duplex UNS S32750 / S32760 is used for upstream production of oil & gas fluids, fire fighting systems, sea water desalination and high-pressure RO plants.

Stainalloy carries a full stock program of Super Duplex UNS S32750 / S32760 piping materials. The stock program consists of seamless & welded pipes, seamless & welded fittings, forgings & forged flanges starting from ½” up to and including 48”. The Super Duplex UNS S32750 / S32760 stocks of Stainalloy are manufactured in accordance with ASTM requirements: seamless pipe ASTM A790 UNS S32750 / S32760, welded pipe ASTM A928 UNS S32750 / S32760, seamless & welded fittings ASTM A815 UNS S32750 / S32760 and forgings & forged flanges ASTM A182 F53.

Our clients benefit from a Super Duplex stock program that is subjected to the most stringent test requirements exceeding Norsok M630 and Shell MESC specifications. All Super Duplex stocks are manufactured exclusively by Norsok M650 approved mills. The stock program of Stainalloy is of particular use to clients executing construction projects related to the upstream oil & gas and seawater desalination industries.

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Characteristics Super Duplex
UNS S32750 / 32760


The advantage of Super Duplex stainless steel is that it is easier to weld thanks to its austenite ferrite mixing structure. In addition, Super Duplex stainless steel has superior mechanical properties and significantly better resistance to stress corrosion cracking in chloride-containing environments. Thanks to its high Chromium and Molybdenum content, - UNS S32750 / 327660 reaches PREN values ​​between 38-46.

Application industries for UNS S32750 / 32760 are:

  • Chemical industry
  • Desalination plants
  • Petrochemistry
  • On-Offshore industry

Super Duplex UNS S32750 / 32760 are the most common Super Duplex grades on the market. The stainless steel is characterized by its excellent corrosion and point rust resistance. It has very good resistance to local corrosion and stress corrosion cracking in combination with high mechanical strength. Super Duplex has a double structure, combining the positive properties of stainless chrome-nickel and chrome-steel.

Super Duplex UNS S32750 / 32760 is characterized by:

  • High resistance to stress corrosion cracking in halide containing environments
  • High resistance to pitting and crevice corrosion
  • High yield strength and tensile strength
  • High resistance to general corrosion
  • High thermal conductivity and low thermal expansion
  • High mechanical strength
  • High resistance to erosion, corrosion and corrosion fatigue
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