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UNS S31803 Duplex Stainless SteelUNS S31803 / 1.4462 / F51

Duplex Stainless Steel

Material to UNS S31803 is described as a duplex stainless steel with a microstructure of 50:50 austenite and ferrite.

The steel combines good mechanical strength (typically up to over 480 MPa yield strength) and ductility with moderate to good corrosion resistance in a variety of environments. By agreement, the alloy can be supplied with a PREN (Pitting Resistance Equivalent) at >34 which ensures that the resistance to pitting corrosion is as high as possible for this alloy grade. In addition, the steel offers good resistance to stress corrosion cracking. Ambient and sub-zero temperature notch ductility is good.

An alternative to 300 series stainless steels

These attributes mean that this duplex steel can be used successfully as an alternative to 300 series stainless steels in applications where higher mechanical strength / lower weight is required and / or resistance to stress corrosion cracking is needed.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Download UNS S31803 Duplex Stainless Steel Datasheet

Typical Applications:

  • Chemical engineering components
  • Oil & Gas industry components
  • Brewing industry
  • Pipework, flanges & manifolds
  • Pumps & valves

We offer UNS S31803 Super Austenitic Stainless Steel in bar, forgings, sheet, plate, pipe, tube, closed die forgings, flanges and welding consumables.


Our processing department within the Smith's Group utilises thirty power saws including fully automated magazine feed CNC rod blanking lines. We can economically cut your material regardless of the volume required.

Pick a Product

To find out more about Smiths Metal Centres extensive range of high quality duplex and super duplex stainless steel products, click on one of our products on the side menu of this web page.

Have a question or need a detailed quote?

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on 0845 527 3331 or click here to contact us.