Hot-Dip Galvanised Square Tube for Durable Structural Fabrication and Long-Lasting Outdoor Use
| MOQ | 1 Meter |
| Category | Metallurgy, Mineral & Energy |
More from this Supplier
Product Description
Square & Hot-Dip Galvanised Square Tube Specification Document
Product Description
Square tubes (square and rectangular hollow sections) include black square tubes (black finish square & rectangular tubes) and hot-dip galvanised square tubes. The base material is cold-formed welded hollow section. After hot-dip galvanising, both inner and outer surfaces are coated with zinc for corrosion protection, delivering excellent outdoor rust resistance.
Applications: Photovoltaic supports, steel structure frames, guardrails, greenhouses, equipment bases, curtain wall projects. Common grades: Q235B, Q355B. Standard length: 6m. Cutting, hole punching and tube bending services available.
Theoretical weight formulas: Square tube: kg/m = 0.00785 × wall thickness × (4 × side length − 4 × wall thickness) Rectangular tube: kg/m = 0.00785 × wall thickness × (2 × long side + 2 × short side − 4 × wall thickness) Galvanising weight gain: Weight increases by approximately 2%~4% after galvanising; a weight gain factor may be applied for quotation calculation.
Applicable Standard: GB/T 6728 Cold formed hollow steel sections
1. Square Tube (Common Specification Table for Black Square Tube / Galvanised Square Tube)
| Size (mm) | Wall Thickness (mm) | Theoretical Weight (kg/m) |
|---|---|---|
| 20×20 | 1.5 | 0.89 |
| 25×25 | 2.0 | 1.42 |
| 30×30 | 2.0 | 1.78 |
| 40×40 | 2.0 | 2.34 |
| 40×40 | 2.5 | 2.89 |
| 50×50 | 2.0 | 2.96 |
| 50×50 | 2.5 | 3.64 |
| 50×50 | 3.0 | 4.29 |
| 60×60 | 2.5 | 4.39 |
| 60×60 | 3.0 | 5.19 |
| 80×80 | 3.0 | 7.14 |
| 80×80 | 4.0 | 9.22 |
| 100×100 | 3.0 | 8.91 |
| 100×100 | 4.0 | 11.65 |
| 100×100 | 5.0 | 14.24 |
| 120×120 | 4.0 | 14.02 |
| 120×120 | 5.0 | 17.16 |
| 140×140 | 4.0 | 16.40 |
| 140×140 | 5.0 | 20.08 |
| 150×150 | 5.0 | 21.68 |
2. Rectangular Tube (Rectangular Hollow Section, Black Tube / Galvanised Rectangular Tube)
| Size (mm) | Wall Thickness (mm) | Theoretical Weight (kg/m) |
|---|---|---|
| 40×20 | 2.0 | 1.85 |
| 50×30 | 2.0 | 2.34 |
| 60×40 | 2.5 | 3.49 |
| 80×40 | 2.5 | 4.28 |
| 80×60 | 3.0 | 6.02 |
| 100×50 | 3.0 | 6.60 |
| 100×60 | 3.0 | 7.07 |
| 120×60 | 3.0 | 7.95 |
| 120×80 | 4.0 | 11.06 |
| 140×80 | 4.0 | 12.32 |
| 160×80 | 4.0 | 13.57 |
| 160×100 | 4.0 | 14.83 |
Remarks
- Black square tube: Non-galvanised base material, lower cost, suitable for indoor environments. Hot-dip galvanised square tube: Fully hot-dipped zinc coating with thick zinc layer and strong corrosion resistance; the preferred option for outdoor projects.
- Theoretical weight refers to the weight of the base black tube. Finished galvanised product weight rises by 2%~4%, which can be added for quotations as required.
- Processing services: Cut-to-length, hole drilling, bending, beveling and hot-dip galvanising.
- Theoretical weight is for budget estimation only. Actual delivery weight shall be subject to weighing.
Technical Specifications
| Model 40×20mm | wall thickness 2.0mm, theoretical weight 1.85kg/m |
| Model 50×30mm | wall thickness 2.0mm, theoretical weight 2.34kg/m |
| Model 60×40mm | wall thickness 2.5mm, theoretical weight 3.49kg/m |
| Model 80×40mm | wall thickness 2.5mm, theoretical weight 4.28kg/m |
| Model 80×60mm | wall thickness 3.0mm, theoretical weight 6.02kg/m |
| Model 100×50mm | wall thickness 3.0mm, theoretical weight 6.60kg/m |
| Model 100×60mm | wall thickness 3.0mm, theoretical weight 7.07kg/m |
| Model 120×60mm | wall thickness 3.0mm, theoretical weight 7.95kg/m |
| Model 120×80mm | wall thickness 4.0mm, theoretical weight 11.06kg/m |
| Model 140×80mm | wall thickness 4.0mm, theoretical weight 12.32kg/m |
| Model 160×80mm | wall thickness 4.0mm, theoretical weight 13.57kg/m |
| Model 160×100mm | wall thickness 4.0mm, theoretical weight 14.83kg/m |