Product catalogue
Everything below is rolled in-house. Stock items ship in 3 days; made-to-order sections run 15–25 days depending on grade and coating.
Square tube
Wall 1.5–16 mm · length 6 / 9 / 12 m or cut to length · welded tube per GB/T 6728, EN 10219, ASTM A500.
| Section (mm) | Wall range (mm) | Weight (kg/m) | Line | Availability |
|---|---|---|---|---|
| 30×30 | 1.5 – 3.0 | 1.32 – 2.54 | Cold-formed | Made to order |
| 40×40 | 2.0 – 4.0 | 2.31 – 4.34 | Cold-formed | Made to order |
| 50×50 | 2.0 – 5.0 | 3.01 – 7.11 | Cold-formed | Stock |
| 60×60 | 2.5 – 5.0 | 4.50 – 8.59 | 80 | Stock |
| 80×80 | 2.5 – 6.0 | 6.04 – 13.9 | 80 | Stock |
| 100×100 | 3.0 – 8.0 | 9.02 – 23.2 | 100 | Stock |
| 120×120 | 3.5 – 8.0 | 12.7 – 28.0 | 130 | Stock |
| 130×130 | 4.0 – 10.0 | 15.7 – 37.7 | 130 | Stock |
| 150×150 | 5.0 – 10.0 | 22.6 – 43.9 | 200 | Stock |
| 200×200 | 6.0 – 12.0 | 36.3 – 70.9 | 200 | Stock |
| 250×250 | 7.0 – 12.0 | 53.1 – 89.4 | 400 | Made to order |
| 300×300 | 8.0 – 14.0 | 72.8 – 125 | 400 | Made to order |
| 400×400 | 10.0 – 16.0 | 121 – 191 | 400 | Made to order |
Rectangular tube
Same wall and grade range as square tube, rolled to RHS proportions for beams, purlins and chassis rails.
| Section (mm) | Wall (mm) | Typical use |
|---|---|---|
| 20×40 | 1.5 – 2.5 | Furniture, light frames |
| 40×60 | 2.0 – 4.0 | Racking beams, guards |
| 40×80 | 2.0 – 5.0 | Trailer floor bearers |
| 50×100 | 2.5 – 6.0 | Purlins, machine frames |
| 60×120 | 3.0 – 6.0 | Portal frame members |
| 100×150 | 4.0 – 8.0 | Heavy frames, columns |
| 100×200 | 5.0 – 10.0 | Chassis rails, crane jibs |
| 200×300 | 6.0 – 12.0 | Heavy structure |
| 300×500 | 8.0 – 16.0 | Special projects |
Materials
| Grade | Yield (MPa) | Character | Typical application |
|---|---|---|---|
| Q235B | ≥235 | General structural | Frames, supports, furniture |
| Q355B | ≥355 | 8,000 t in stock | Columns, beams, chassis |
| Q355C / D / E | ≥355 | Impact at 0 / −20 / −40 °C | Cold-climate structures |
| Q420B | ≥420 | High strength | Lightweight heavy-load frames |
| 550D | ≥550 | Automotive structural | Body-in-white members |
| 510L / 610L / 700L | 510 – 700 | Frame steel | Truck and trailer chassis |
| 500TM / 700TM | 500 – 700 | Wear resistant | Mining, tipping bodies |
| SPA-H | ≥355 | Weathering (Cu-P-Cr-Ni) | Bridges, guardrail, exposed steel |
Yield values are minimums per the corresponding GB standard; equivalent EN/ASTM grades available on request.
Processing
Saw or laser, ±0.5 mm on length, burr-free ends, bundle or single piece.
CNC hole patterns from your DXF, up to 30 mm diameter, deburred.
Hot-dip per EN ISO 1461, 55–85 µm, vent and drain holes designed in.
Shot blast Sa2.5 + primer/topcoat, RAL matched, 60–120 µm DFT.
Mandrel bending to drawing, 3D radius checks on first article.
Steel-strap bundles, edge protectors, container loading plan, custom marks.
Tolerance
| Item | GB/T 6728 | EN 10219 | ASTM A500 |
|---|---|---|---|
| Wall thickness | ±10 % | ±10 % | −10 % |
| Outside dimension | ±1 % | ±1 % (min ±0.5 mm) | ±0.5 % |
| Squareness | ≤1.5 mm / 100 mm | 90° ±1° | 90° ±2° |
| Straightness | ≤0.15 % L | 0.2 % L | 0.2 % L |
| Length | +20 / 0 mm | +50 / 0 mm | +25 / 0 mm |
