Super Duplex Metal Products

Arc Alloys Limited offers a large variety of products in Super Duplex Stainless Steel alloys such as tubing, seamless and welded pipe, butt weld fittings, flanges, pressure fittings and fasteners:

The first-generation duplex stainless steels were developed more than 70 years ago in Sweden for use in the sulfite paper industry. Called duplex because of its mixed microstructure with about equal proportions of ferrite and austenite, duplex stainless steels are a family of grades, which range in corrosion performance depending on their alloy content. The term “Super Duplex” was first used in the 1980’s to denote highly alloyed, high-performance “super” duplex steel with a pitting resistance.


  • High strength,
  • High resistance to pitting, crevice corrosion resistance.
  • High resistance to stress corrosion cracking, corrosion fatigue and erosion,
  • Excellent resistance to chloride stress-corrosion cracking
  • High thermal conductivity
  • Low coefficient of thermal expansion
  • Good sulfide stress corrosion resistance,
  • Low thermal expansion and higher heat conductivity than austenitic steels,
  • Good workability and weldability,
  • High energy absorption.


  • Heat exchangers, tubes and pipes for production and handling of gas and oil,
  • Heat exchangers and pipes in desalination plants,
  • Mechanical and structural components,
  • Power industry FGD systems,
  • Pipes in process industries handling solutions containing chlorides,
  • Utility and industrial systems, rotors, fans, shafts and press rolls where the high corrosion fatigue strength can be utilized,
  • Cargo tanks, vessels, piping and welding consumables for chemical tankers.
  • High-strength, highly resistant wiring.
  • Material : Super Duplex
  • Common names: SDSS,32760,32750, Zeron®100,SAF2507®,F53,F55
  • Uns ( unified Numbering system ) : UNS S32760, UNS S32750
  • Werkstoff : 1.4501,1.4410,

Arc Alloys ltd supplies Super Duplex in the following Product Forms:

  • Seamless pipe to ASTM A790 and ASME SA790
  • Welded pipe to ASTM A928 and ASME SA928
  • Flanges to ASTM A182 and ASME SA182
  • Fittings to ASTM A815 and ASME SA815
  • Bar to ASTM A479 and ASME SA479
  • Plate to ASTM A240 and ASME SA240
  • We also supply special machined turned parts and bolting in Super Duplex made from several of the above product forms.