Alloy 321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance.
These titanium-bearing stainless steels are stabilized against carbide precipitation. They are designed for operation within the damaging temperature range where carbide precipitation develops. In this type of steel, the carbon combines preferentially with titanium to form a harmless titanium carbide, leaving the chromium in solution to maintain full corrosion resistance. Type 321 is basic type 304 modified by adding titanium in an amount at least 5 times the carbon-plus-nitrogen contents.
Type 321 is basic type 304 modified by adding titanium in an amount at least 5 times the carbon plus nitrogen contents.
These titanium bearing stainless steels are stabilized against carbide precipitation and designed for eperation within the damaging temperature range where carbide precipitation develops. In this type of steel, the carbon combines preferentially with titanium to form a harmless titanium carbide, leaving the chromium in solution ot maintain full corrosion resistance.
| Grade | 321 | 321H |
|---|---|---|
| UNS Designation | S210000 | S32109 |
| Carbon (C) Max. | 0.08 | 0.04 – 0.10 |
| Manganese (Mn) Max. | 2.00 | 2.00 |
| Phosphorous (P) Max. | 0.040 | 0.040 |
| Sulphur (S) Max. | 0.030 | 0.030 |
| Silicon (Si) Max. | 0.75 | 0.75 |
| Chromium (Cr) | 17.0 – 20.0 | 17.0 – 20..0 |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 |
| Molybdenum (Mo) | — | — |
| Nitrogen (N) | 0.1 Max. | 0.1 Max. |
| Iron (Fe) | Bal. | Bal. |
| Other Elements | Ti=5(C) to 0.70% | Ti=5(C) to 0.60% |
*The titanium content shall not be less than 5 times the carbon content and not more than 0.60%. 321H requires the titanium content to be not less than 4 times the carbon content and not more than 0.60%.
| Material | Tensile Strength Rm, N/mm² | Yield Strength Rp 0.2, N/mm² |
% Elongation |
|---|---|---|---|
| Alloy 321 Tube | 500-730 | 200 | 35 |
Alloy 321/H can be easily welded and processed by standard shop fabrication practices.
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