We manufacture welded stainless steel square and rectangular tube sections for structural, architectural, and fabrication applications.
Stainless steel square and rectangular tube sections are used wherever a flat, stable profile matters more than a round one — structural framing, architectural railings and balustrades, furniture and fixture fabrication, and equipment frames and enclosures. Like our round tube, these sections are TIG welded for a clean, robust seam, then formed to final dimension from welded tube stock through additional sizing rolls — a process that gives the finished section sharp, consistent corners and flat faces without compromising the weld integrity established during the initial forming stage.
| Grades | 200 Series, 300 Series, 400 Series, and High-Nickel Alloys |
| Finishes | As-welded, annealed & pickled, matte polished, mirror polished |
| Testing | Air-under-water, hydro-testing, eddy-current, and other lab tests — see our Quality Assurance page for the full process |
ASTM A554 is the standard specification for welded stainless steel mechanical tubing, covering square and rectangular structural/ornamental sections as well as round.
Square and rectangular tube is typically chosen over round for its flat mounting surfaces and resistance to rotation in structural framing and railing applications — the trade-off is a somewhat more complex forming process during manufacture, which is why size availability is narrower than round tube. We manufacture this profile from 10×10mm up to 25×75mm.
Weight per metre (kg/m), across the size × wall-thickness combinations we manufacture.
| Size (mm) | Thickness (mm) | |||||
|---|---|---|---|---|---|---|
| 0.8 | 0.9 | 1 | 1.2 | 1.5 | 2 | |
| 10X10 | 0.236 | 0.263 | 0.290 | 0.342 | 0.417 | 0.531 |
| 12X12 | 0.299 | 0.335 | 0.369 | 0.437 | 0.535 | 0.689 |
| 15X15 | 0.362 | 0.405 | 0.448 | 0.531 | 0.653 | 0.846 |
| 20X20 | 0.488 | 0.547 | 0.605 | 0.720 | 0.889 | 1.161 |
| 25X25 | 0.614 | 0.689 | 0.763 | 0.909 | 1.125 | 1.476 |
| 30X30 | 0.740 | 0.830 | 0.920 | 1.098 | 1.362 | 1.791 |
| 40X40 | 0.992 | 1.114 | 1.235 | 1.476 | 1.834 | 2.420 |
| 50X50 | 1.244 | 1.397 | 1.550 | 1.854 | 2.306 | 3.050 |
| Size (mm) | Thickness (mm) | |||||
|---|---|---|---|---|---|---|
| 0.8 | 0.9 | 1 | 1.2 | 1.5 | 2 | |
| 10X20 | 0.362 | 0.405 | 0.448 | 0.531 | 0.653 | 0.846 |
| 10X30 | 0.488 | 0.547 | 0.605 | 0.720 | 0.889 | 1.161 |
| 13X26 | 0.488 | 0.547 | 0.605 | 0.720 | 0.889 | 1.161 |
| 10X40 | 0.614 | 0.689 | 0.763 | 0.909 | 1.125 | 1.476 |
| 10X50 | 0.740 | 0.830 | 0.920 | 1.098 | 1.362 | 1.791 |
| 20X40 | 0.740 | 0.830 | 0.920 | 1.098 | 1.362 | 1.791 |
| 25X75 | 1.244 | 1.397 | 1.550 | 1.854 | 2.306 | 3.050 |
| 40X60 | 1.244 | 1.397 | 1.550 | 1.854 | 2.306 | 3.050 |
Figures shown are for our standard austenitic density (8.00 g/cm³ — 300 series and 310/310S). For 200/400 series, or a size/thickness combination not shown here, use our Metal Weight Calculator.
Grade, size, standard, quantity — send what you have and we'll respond with availability, lead time and pricing.