Duplex Stainless-steel offers corrosion resistance and high mechanical strength as a competitive solution to the usually expensive nickel alloys. They offer higher durability compared to carbon steels and conventional stainless steels. The strengths provides the end user or fabricator with the option of lighter weight at higher mechanical strength.
Duplex stainless steels are specified according to their PREN value (PREN = %Cr+3.3%Mo+16%N)
Generally Duplex steels are available in dual grades such as UNS 31803/UNS 32205, UNS 32750/UNS 322507, UNS 32760 and other custom grades according to the end user requirements.