UNS S31803 2205 Duplex

2205 Duplex Stainless Steel (UNS S31803)


UNS S31803 or 2205 Duplex is a super austenitic premium stainless grade that exudes high corrosion resistance. The name comes from the chemical make-up of 22% Chrome and 5% Nickel. 2205 Stainless was originally created for the pulp and paper to counter act harsh chemicals and chlorides. It is now prevalent in many industries as a more cost-efficient alloy in lieu of higher nickel grades.


Along with resistance to corrosive material, 2205 Duplex displays high energy absorption and resistance to erosion. Duplex 2205 has higher heat conductivity and low thermal expansion compared to austenitic stainless steels. It boasts high strength, good resistance to sulfide stress corrosion, and high resistance to pitting and crevice to corrosion.


Premium Alloys offers 2205 Duplex in condition Annealed. Duplex 2205 accounts for over 80% of the total usage of Duplex stainless steels throughout the world because of its superior workability as well as corrosion resistance.

Physical Properties:

Tensile Yield Enlongation Reduction
of Area
Annealed 90 65 25 28 HRC Max


  • Valves
  • Pump and Boat Shafts
  • Pulp and Paper
  • Petrochemical
  • Desalination
  • Oil and Gas


  • Superior resistance to corrosion fatigue over other stainless grades
  • High energy absorption
  • High resistance to pitting and erosion
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