Specifications
Chemical Composition, %
Features
Applications
Type 321 is a widely used stainless steel, where parts are heated within carbide-precipitation temperature range (800-1500°F) and exposed to corrosive atmosphere. Type 321 is similar to SS 304, but with higher nickel content and stabilized with titanium. Titanium preferentially reacts with carbon in the steel and prevents precipitation of chromium carbides at the grain boundaries, thus preserving corrosion-resistant properties by preventing depletion of chromium near the grain boundaries during exposure within critical temperature range. This grade responds well to hardening by cold working. It has good welding characteristics; and post-weld annealing is not normally required to restore its excellent performance in a wide range of corrosive conditions.
UNS: S32109
ASTM: A240, A480, A666, A262 ASME: SA240, SA480, SA666 EN: 10088-2, 10028-7
|
Cr |
Mn |
Si |
Ni |
P |
S |
C |
N |
Ti |
|
|
MIN |
17.0 |
– |
– |
9.0 |
– |
– |
– |
– |
5 (C+N) |
|
MAX |
19.0 |
2.0 |
0.75 |
12.0 |
0.045 |
0.030 |
0.080 |
0.1 |
0.700 |
• Responds well to hardening by cold working
• Good welding characteristics
• Excellent corrosion resistance in a wide variety of corrosive media
• Heat exchangers
• Aircraft industry
• Fabrication industry