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Standard Stainless Steel 321 (UNS S32100) heat-resistant pipes are widely utilized in heavy-duty aircraft exhaust manifolds, thermal processing equipment, chemical expansion joints, and refinery furnace tubes. By combining titanium with carbon to form stable titanium carbides, SS 321 retains high tensile strength and grain boundary corrosion immunity during prolonged thermal cycles.
| Product Form | Outer Diameter (OD) | Wall Thickness (WT) | Standard Length |
|---|---|---|---|
| Seamless Pipe (SMLS) | 10.3mm – 610.0mm (1/8" – 24") | 1.24mm – 59.54mm (SCH 5S – SCH 160) | 6m / 12m / Fixed Length |
| Welded Pipe (ERW / EFW) | 15.0mm – 1219.0mm (1/2" – 48") | 1.5mm – 30.0mm (SCH 5S – SCH 80S) | 6m / Cut-to-length |
| Superheater / Boiler Tubing | 15.88mm – 76.2mm | 1.2mm – 8.0mm | Straight 12m / U-Bended |
| Element | Cr | Ni | Ti | C | Mn | Si | P / S | Fe |
|---|---|---|---|---|---|---|---|---|
| Min. | 17.0 | 9.0 | 5 × (C+N) | - | - | - | - | Bal. |
| Max. | 19.0 | 12.0 | 0.70 | 0.08 | 2.00 | 0.75 | 0.045 / 0.030 | Bal. |
| Tensile Strength Rm (MPa) | Yield Strength Rp0.2 (MPa) | Elongation A5 (%) | Hardness (HB) | Density (g/cm³) | Melting Range (°C) |
|---|---|---|---|---|---|
| ≥ 515 | ≥ 205 | ≥ 35 | ≤ 217 | 7.92 | 1398 – 1420 |
