About Smiths

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 S21900 (Nitronic® 40)

Austenitic Stainless Steel

Nitronic® 40 (UNS S21900) Stainless Steel

Outstanding performance in both elevated and cryogenic temperatures.

Introducing Nitronic® 40

Offering a combination of good corrosion resistance with high yield strength, Nitronic® 40 is a high-manganese austenitic stainless steel. The alloy provides outstanding performance in both elevated and cryogenic temperature environments where the materials high strength and toughness is maintained. The room temperature yield strength of the alloy is approximately double when compared to type 304, 321 and 347 stainless steel. The product is readily weldable and can be fabricated.


Nitronic® 40 will resist stress corrosion cracking in marine environments and offers good high-temperature oxidation resistance. The alloy continues to be non-magnetic even at cryogenic temperatures.

Typical Applications

Commercial applications for this engineering material include:

  • Ducting and bellows
  • Aircraft engine component
  • Cryogenic service
  • Chemical processing

We stock Nitronic® 40 (UNS S21900) in round bar and round tube.

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 Nitronic® 40 (UNS S21900) 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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