SS 321 is stabilized with titanium (minimum 5× carbon content) to prevent sensitization at elevated temperatures. The titanium preferentially combines with carbon, preventing chromium carbide formatio...
SS 321 is stabilized with titanium (minimum 5× carbon content) to prevent sensitization at elevated temperatures. The titanium preferentially combines with carbon, preventing chromium carbide formation at grain boundaries. Ideal for service in the 425–900°C range where sensitization of standard 304 would cause intergranular corrosion.
| Property | Value |
|---|---|
| Grade | SS 321 |
| ASTM / ASME | ASTM A403 WP321 |
| UNS Number | S32100 |
| Chromium (Cr) | 17–19% |
| Nickel (Ni) | 9–12% |
| Molybdenum (Mo) | — |
| Max/Min Service Temp | 900°C |
| Fitting Standard | ASME B16.9 / MSS SP-43 |
| Size Range | ½" NB to 48" NB |
| Certificate | EN 10204 3.1 MTC |
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