Stainless Steel Alloy Duplex 2205, UNS S32205

Duplex 2205, also known as UNS S32205, is a nitrogen-enhanced stainless steel. Users choose Duplex 2205 for its excellent corrosion resistance along with its high strength. It is important to note that Duplex 2205, offers much higher levels of corrosion resistance than most other austenitic stainless steels. Other benefits include:

  • High resistance to pitting and crevice corrosion
  • Excellent in most caustic environments
  • Good weldability

To be considered Duplex 2205, a stainless steel must have a chemical composition that includes:

  • Cr 21-23%
  • Ni 4.5-6.5%
  • Mn 2% Max
  • Mo 2.5-3.5%
  • N 0.08-0.20%
  • P 0.30% max
  • C 0.030% max

This unique mix of materials makes Duplex 2205 the right choice for a number of different critical applications in a range of industries, including:

  • Chemical processing, transport, and storage
  • Marine and Land cargo tanks
  • Biofuel production
  • Food processing
  • Pulp and Paper manufacturing
  • Oil and gas exploration and processing
  • Waste management
  • High chloride environments