Stainless 321 / AISI 321

Chemical Analysis

C

.03

MN

2.00

P

.045

S

.03

Si

1.00

Cr

17.0- 19.0

Ni

9.0- 12.0

Mo

.50

Cu

.50

Ti

5 x C min

Stainless 321 is a chromium-nickel steel which was developed with improved intergranular-corrosion resistance. Stainless 321 is resistant to atmospheric corrosion, sterilizing solutions, many organic chemicals, and a wide variety of inorganic chemicals. Type 321 should be used for applications requiring heating between 800 °F and 1650 °F such as aircraft collector rings, and exhaust manifolds, expansion joints, and high temperature chemical process equipment.

Available forms of Stainless 321​ are seamless pipe, welded pipe, seamless tube, welded tube, bar, wire, sheet, plate, forgings, pipe fittings and flanges.