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We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.

UNS S31803 (1.4462 / F51)

Duplex Stainless Steel

UNS S31803 Duplex Stainless Steel

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

Good Mechanical Strength

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.

Typical Applications

Commercial applications for this engineering material include:

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

We stock UNS S31803 in flats, round bar, plate, sheet, round tube, hollow bar and square bar.

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.

Additional Info

A technical datasheet for UNS S31803 is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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