309S 310S 321 Round Stainless Steel Tube
Mar 26, 2025
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309S 310S 321 Round Stainless Steel Tube
Type: Seamless pipe, welded pipe (ERW/TIG welding).
Size range:
Outer diameter: 6-610 mm (seamless), 10-2500 mm (welded).
Wall thickness: 1-50 mm (seamless), 0.5-20 mm (welded).
Surface treatment: hot rolled (black skin), pickled passivated, polished (mirror/brushed).
Chemical Composition of 309S 310S 321 seamless Stainless Steel Pipes
| Element | 309S (ASTM A312) | 310S (ASTM A312) | 321 (ASTM A312) |
|---|---|---|---|
| Carbon (C) | ≤0.08% | ≤0.08% | ≤0.08% |
| Chromium (Cr) | 22-24% | 24-26% | 17-19% |
| Nickel (Ni) | 12-15% | 19-22% | 9-12% |
| Titanium (Ti) | - | - | 5×C%-0.70% |
| Molybdenum (Mo) | ≤0.75% | ≤0.75% | ≤1.00% |
Mechanical Properties of 309S 310S 321 Stainless Steel Pipes
| Property | 309S | 310S | 321 |
|---|---|---|---|
| Tensile Strength | ≥515 MPa | ≥515 MPa | ≥515 MPa |
| Yield Strength | ≥205 MPa | ≥205 MPa | ≥205 MPa |
| Elongation | ≥35% | ≥35% | ≥35% |
| Hardness | ≤217 HB | ≤217 HB | ≤217 HB |
