Duplex Stainless Steel

Often referred to as ferritic-austenitic stainless steel, duplex stainless steel combines many of the beneficial properties of ferritic and austenitic steels. Its high content of chromium and nitrogen, and often molybdenum, provides resistance to localized and uniform corrosion.

Note: Optional bolting flanges on duplex tanks will be made of 316L SS.

Characteristic properties:
  • Good to very good resistance to uniform corrosion
  • Good to very good resistance to pitting and crevice corrosion
  • High resistance to stress corrosion cracking and corrosion fatigue
  • High mechanical strength
  • Good abrasion and erosion resistance
  • Good fatigue resistance
  • High energy absorption
  • Low thermal expansion
  • Good weldability
  • Pulp and paper industry
  • Desalination plants
  • Flue-gas cleaning
  • Cargo tanks and pipe systems in chemical tankers
  • Seawater systems
  • Firewalls and blast walls on offshore platforms
  • Bridges
  • Components for structural design
  • Storage tanks
  • Pressure vessels
  • Heat exchangers
  • Water heaters
  • Rotors, impellers and shafts
  • Reinforcing bars for concrete structures
Material Pitting Resistance Chloride Level(ppm)
304 19 <200
316 24 <200
316L 26 200 – 1000
Duplex 35 200 – 3600