Type 321 Stainless Steel is a stabilized austenitic stainless steel similar to Type 304 but with a titanium addition of at least five times the carbon content. This titanium addition reduces or prevents carbide precipitation during welding and in 800 – 1500°F service. It also improves the elevated temperature properties of the alloy.
Chemical Composition (%) of 321 Stainless Steel Plate
| Carbon | Silicon | Sulfur | Phosphorus | Chromium | Titanium | Manganese | Nickel | Nitrogen |
| 0.008 | 0.75 | 0.03 | 0.045 | 17.0-19.0 | 5 x (C + N) min.-0.70 max. | 2.00 | 9.0-12.0 | 0.10 |
Standard Specification Of 321 coil
| Thickness | 0.1mm-12mm |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | Since the custom |
| Surface | 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, checkered, embossed, hair line, sand blast, Brush, etching, etc |
| Finish | Hot rolled coil (HR), Cold rolled coil (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated) |
| Form | Coils, Foils, Rolls, Plain coil, Shim coil, Perforated coil, Chequered coil, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
Alloys 321 and 347 have similar resistance to general corrosion as the unstable Ni-Cr 304.
Prolonged heating in the temperature range of the chromium carbide degree may affect the corrosion resistance of alloys 321 and 347 in harsh corrosive media.
The corrosion resistance of the two alloys is similar in most environments;
However, the corrosion resistance of the annealed alloy 321 in the strong oxidizing environment is slightly lower than that of the annealed alloy 347.
Alloy 347 is therefore superior in water and other low temperature environments.
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