Stainless Steel 321

321 is generally the preferred grade for use in what can be described as the carbide precipitation range - 425oC to 850oC. It is, essentially, the standard austenitic 18/8 (18% chromium, 8% nickel) Grade 304 to which titanium has been added to stabilise it.

It offers good performance up to temperatures of around 900oC - high strength, resistance to scaling and embrittlement.