When your project demands pipework that resists deformation under extreme load, standard tubing often falls short. Our reinforced wall welded stainless tubing is manufactured precisely to solve that challenge. Unlike thin-gauge alternatives, these tubes are engineered with thicker cross-sections to handle high internal pressures, heavy mechanical stress, and corrosive environments without compromising structural integrity. For related heavy-duty options, explore our Bulky Wall Stainless Welded Conduit line, which shares the same commitment to oversized wall dimensions. In systems where fluid containment and external impact resistance are critical, our Dense Wall Stainless Steel Welded Pipe provides an extra layer of safety through tight molecular grain density. For frameworks that must carry cyclical loads without fatigue failure, the Robust Gauge Welded Stainless Tube offers a balanced strength-to-weight ratio ideal for dynamic applications. And for the most demanding industrial settings, our Thick Profile Stainless Welded Tubing delivers maximum wall thickness where standard schedules are not enough.
Reinforced Wall Welded Stainless Tubing is produced through continuous roll-forming and precision welding of austenitic stainless steel strip, followed by substantial cold-working to achieve enhanced mechanical properties. The longitudinal weld bead undergoes full-penetration fusion and is refined to a uniform projection, typically controlled within 0.1 mm of the parent wall. This design eliminates weak points commonly found in conventional welded tubes. Available in grades 304/304L and 316/316L, the tubing maintains excellent corrosion resistance in chloride-rich and acidic media, with pitting resistance equivalent number (PREN) consistently above 24 for the 316 variant. Post-weld in-line bright annealing dissolves chromium carbides, restoring full corrosion resistance and providing a smooth, oxidation-free internal surface with Ra ≤ 0.8 µm. The microstructure is fully austenitic with a grain size finer than ASTM 7, ensuring ductility and toughness even at sub-zero temperatures. Hydrostatic testing above 1.5 times the rated working pressure is performed on every production lot, and optional eddy current or ultrasonic inspection can be added for critical service.
| Outer Diameter (mm) | OD Tolerance (± mm) | Wall Thickness Tolerance (± %) | Ovality (max %) |
|---|---|---|---|
| 6.00 – 30.00 | 0.08 | 10 | 1.5 |
| 30.10 – 88.90 | 0.10 | 10 | 1.5 |
| 88.91 – 168.28 | 0.13 | 10 | 1.8 |
| 168.29 – 219.10 | 0.20 | 12 | 2.0 |
| Grade | Tensile Strength (MPa min) | Yield Strength 0.2% (MPa min) | Elongation (% min in 50mm) | Hardness (HRB max) |
|---|---|---|---|---|
| 304/304L | 515 | 205 | 35 | 90 |
| 316/316L | 515 | 205 | 35 | 90 |
The reinforced wall design permits pressure ratings significantly exceeding standard Schedule 40 pipes of equivalent nominal size. For instance, a 50.8 mm OD tube with a 5.0 mm wall in grade 304 sustains a working pressure above 200 bar at ambient temperature, based on ASME B31.3 allowable stress. Each tube is marked with heat number, dimension, and material traceability code to satisfy full EN 10204 3.1 certification. Consistent wall concentricity, validated by laser micrometer inspection during manufacturing, guarantees uniform circumferential resistance, making these tubes a reliable choice for high-integrity applications such as hydraulic cylinders, heat exchanger shells, and offshore structural elements.
