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.

Type 321

Stainless Steel

321 Stainless Steel

Type 321 stainless is an austenitic steel alloy with added titanium which acts as a stabiliser.

Additional Titanium

The titanium content is typically five times that of the carbon content, and this addition reduces carbide precipitation during welding and improves elevated working temperature properties. Type 321 offers excellent resistance to oxidation and chemical corrosion. The alloy also possesses good creep strength. It can be readily formed or drawn though it is more difficult to form than other austenitic grades. Type 321 has usage in a wide range of applications including Oil & Gas, petrochemical, aerospace and general industry.


Type 321 stainless steel is a variation of grade 304 with the addition of titanium as a stabiliser. The alloy is resistant to intergranular corrosion and can be easily welded and formed.

Typical Applications

Commercial applications for this engineering material include:

  • Jet aircraft components
  • Oil refinery equipment
  • Stack liners
  • Industrial boilers
  • Pressure vessels
  • Heat exchangers

We stock Type 321 in flats, round bar, plate, sheet, strip, wire, round tube, square bar, hexagon bar, angles, channels and tee sections.

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 Type 321 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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