Duplex Metal Products

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

Called duplex because of its mixed microstructure with about equal proportions of ferrite and and austenite, duplex stainless steels are a family of grades, which range in corrosion performance depending on their alloy content.


  • High strength
  • A cost-effective alternative to austenitic stainless steel 316L.
  • High resistance to pitting, crevice corrosion resistance
  • High resistance to stress corrosion cracking, corrosion fatigue and erosion,
  • 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,
  • Pressure vessels, pipes, tanks and heat exchangers for processing and transport of various chemicals,
  • Pressure vessels, tanks and pipes in process industries handling solutions containing chlorides,
  • Rotors, fans, shafts and press rolls where the high corrosion fatigue strength can be utilized,
  • Cargo tanks, piping and welding consumables for chemical tankers.
  • Material : Duplex
  • Common names: DSS,31803,32205,SAF2205®,F51,F60
  • Uns( unified Numbering system ) : UNS S31803, UNS S32205.
  • Werkstoff : 1.4462,

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 Duplex made from several of the above product forms.