Duplex Stainless Steel

Duplex Grades Stocked:

*F51 / UNS31803 / 1.4462

* Materials where applicable are supplied in accordance with NACE MR0175

Rounds: 3mm dia. to 520mm dia


  • Moderate – good strength
  • Good corrosion & pitting resistance
  • Good stress corrosion cracking resistance
  • Good weldability
  • Good formability

Duplex stainless steels have a high Chromium content (22%), a moderate Nickel content (5.5%) and 3% Molybdenum.  The main advantage of Duplex F51 / 1.4462 / UNS 31803 stainless steel is the combination of properties given by both the austenitic and ferritic steels.


This grade is used in oil & gas, marine, brewing, power generation and chemical industry applications. Specific product applications include heat exchangers, chemical tanks, refineries, marine shafts, pressure vessel parts, compressor parts.

The metallurgy of these steels can be complex and if you need any help concerning usage, heat treatment etc please do consult us for advice specific to your needs. If we can’t provide you with an answer, we will go to our main supplier in Germany – “Doerrenberg” – who have extensive know-how in the field of metallurgy.

sales@birdstst.com or call 01226 766766