Austenitic SS 321
ALLOY 321 / ALLOY 321H | 1.4878 | X8CRNITI18-10 | S32100 / S32109
Austenitic SS 321 is a highly stabilized chromium-titanium or niobium-nitrogen alloy with exceptional oxidation resistance properties and creep strength.
The grade has properties like grade 304 with an exception of titanium stabilization which gives the grade better resistance to carbide precipitation during welding as well as heat treatment.
321 is widely used as a replacement of grade 304 where inter-granular corrosion is a problem. The un-stabilized grades when cooled slowly between 430-820°C tend to form chromium-carbide precipitation at the grain boundary, thus weakening the metal.