Duplex UNS S31803 / S32205

Duplex UNS S31803 / S32205

Stainalloy is very experienced in supplying Duplex UNS S31803/S32205 pipe materials. We have been doing this for more than 30 years. Our extensive experience has enabled us to develop unparalleled technical know-how and excellent relationships with the leading manufacturers.

Duplex UNS S31803/S32205

Duplex UNS S31803/S32205 is an austenitic ferritic stainless steel with high strength. Duplex UNS S31803/S32205 is used for corrosive environments and is resistant to localized corrosion such as pitting, crevice corrosion and stress corrosion cracking. Due to its austenitic ferritic chemical composition, the pipe material has mechanical properties capable of handling high stress conditions. The use of ordinary austenitic stainless steel would not be strong enough in these situations.

Main characteristics

Duplex UNS S31803/S32205 is characterized by:

  • High resistance to stress corrosion cracking in halide-containing environments.
  • Resistant to pitting and crevice corrosion.
  • Resistant to general corrosion.
  • High mechanical strength.
  • Resistant to erosion corrosion and corrosion fatigue.


Duplex UNS S31803/S32205 is used among others for upstream production of high chloride oil & gas liquids. In addition, Duplex UNS S31803/S32205 can be used for other various applications including:

  • FGD gas scrubbers
  • Seawater systems
  • Chemical process vessels, pipes and heat exchangers
  • Seawater pumps and valves
  • Oilfield piping
  • Pulp mill digesters, bleach scrubbers
  • Feed process equipment

Stainalloy supplies worldwide Duplex UNS S31803 / S32205

Stainalloy supplies its large UNS S31803/S32205 piping packages to the oil and gas producing and processing industries worldwide. Stainalloy also supplies mid-sized Duplex UNS S31803/S32205 piping packages from stock, during the advanced stages of construction. Short lead times are required for this.

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Complete duplex UNS S31803/S32205 stock programme

Stainalloy's stock programme consists of seamless & welded pipes, seamless & welded fittings and forgings & forged flanges from ½" up to and including 48". Stainalloy's Duplex UNS S31803/S32205 stocks are manufactured in accordance with ASTM requirements: seamless pipe ASTM A790 UNS S31803/S32205, welded pipe ASTM A928 UNS S31803/S32205, seamless & welded fittings ASTM A815 UNS S31803/S32205 and forgings & forged flanges ASTM A182 F51 UNS S31803/F60 UNS S32205.

According to Norsok M630 and Shell MESC specifications

Our customers benefit from a Duplex stock programme that has been subjected to the most stringent testing requirements exceeding Norsok M630 and Shell MESC specifications. All Super Duplex stocks are manufactured exclusively by Norsok M650 approved European factories. Stainalloy's stock programme is of particular benefit to customers undertaking construction projects related to the upstream oil and gas and water treatment industries.

Vincent van Beest
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