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Product Overview
ASTM A269 Seamless & Welded Stainless Steel Tubes
ASTM A269/SA269 seamless and welded austenitic stainless steel tubing for corrosion-resistant, low and elevated-temperature general service, supplied in solution annealed condition.
Product Introduction
Standard Scope: General service austenitic stainless tubing for corrosion-resistant, low & elevated-temperature service, for instrument lines, process utility, auxiliary heat transfer circuits. Supplied in solution annealed condition.
1. Common Material Grades
| ASTM Grade | UNS No. | EN Number | Core Feature | Density (g/cm³) | Typical Application |
|---|---|---|---|---|---|
| TP304 | S30400 | 1.4301 | General purpose austenitic | 7.93 | Instrument tubing, general corrosion service |
| TP304L | S30403 | 1.4307 | Low carbon, avoid intergranular corrosion after welding | 7.93 | Welded assemblies, pharmaceutical, trace piping |
| TP316 | S31600 | 1.4401 | Molybdenum alloyed, improved chloride resistance | 7.98 | Chemical, coastal environment |
| TP316L | S31603 | 1.4404 | Low carbon molybdenum grade | 7.98 | Chloride-containing media, outdoor process lines |
| TP321 | S32100 | 1.4541 | Ti stabilized, resist weld sensitization | 7.93 | Moderate high-temperature service |
| TP347 | S34700 | 1.4550 | Nb stabilized for welded high-temp components | 7.93 | Thermal cycling piping |
| TP310S | S31008 | 1.4845 | High Cr/Ni, oxidation resistant | 7.98 | High-temperature auxiliary circuits |
Mechanical Properties (Solution Annealed Condition per A269)
| Grade Group | Tensile Strength Min. (MPa) | Yield Strength Min. (MPa) | Elongation (50 mm) Min. (%) | Max Hardness HBW |
|---|---|---|---|---|
| TP304 / TP316 / TP321 / TP347 | 515 | 205 | 35 | 192 |
| TP304L / TP316L | 485 | 170 | 35 | 192 |
2. Dimension General Range for A269 Round Tubing
| Item | Specification |
|---|---|
| Outer Diameter (OD) | 6.4 mm ~ 219.1 mm (1/4" ~ 8"); custom larger OD available |
| Wall Thickness (WT) | ≥0.51 mm (0.020 inch); common range: 0.6 ~ 6.0 mm |
| Standard Length | 6000 mm fixed length; random length 4000-7000 mm; cut-to-length available |
| Tube End | Deburred plain end (PE) |
| Surface Finish | Annealed & pickled (AP), Bright Annealed (BA); optional mechanical polish / electropolish |
| Welded tube requirement | Weld bead removal; full solution annealing after welding |
Dimensional Tolerances (A269 / A450M)
| Parameter | Permissible Tolerance |
|---|---|
| Outer Diameter | OD ≤25.4 mm: ±0.10 mm; 25.4-50.8 mm: ±0.15 mm; >50.8 mm: ±0.5% of OD |
| Wall Thickness | ±10% nominal wall thickness |
| Straightness | Max 1 mm per meter |
| Cut-to-length ≤6 000 mm | +6 mm / 0 mm |
3. Popular Commercial Size Reference Table (A269 Round Tube)
Theoretical weight formula for TP304: W(kg/m) = 0.02491 × (OD - WT) × WT
| Outer Diameter OD (mm) | Common Wall Thickness (mm) | Theoretical Weight TP304 (kg/m) |
|---|---|---|
| 12.7 (1/2") | 1.0 / 1.2 / 1.5 | 0.28 / 0.33 / 0.40 |
| 19.05 (3/4") | 1.0 / 1.2 / 1.5 | 0.44 / 0.52 / 0.64 |
| 25.4 (1") | 1.2 / 1.5 / 2.0 | 0.71 / 0.87 / 1.14 |
| 31.75 (1-1/4") | 1.5 / 2.0 / 2.11 | 1.11 / 1.45 / 1.52 |
| 38.1 (1-1/2") | 1.5 / 2.0 / 2.77 | 1.34 / 1.76 / 2.38 |
| 42.4 | 1.5 / 2.0 / 2.5 | 1.50 / 1.97 / 2.43 |
| 50.8 (2") | 2.0 / 2.5 / 3.05 | 2.38 / 2.94 / 3.54 |
| 63.5 (2-1/2") | 2.0 / 2.5 / 3.0 | 3.00 / 3.70 / 4.38 |
| 76.2 (3") | 2.5 / 3.0 / 3.40 | 4.47 / 5.30 / 5.97 |
| 88.9 | 2.5 / 3.0 / 4.0 | 5.24 / 6.22 / 8.17 |
| 101.6 (4") | 3.0 / 3.5 / 4.0 | 7.12 / 8.27 / 9.32 |