Hollow Sections & Square Tubes
Square and rectangular hollow sections — welded, galvanized and seamless — from 15×15 mm up to 500×500 mm, in wall thicknesses from 0.8 mm to 20 mm. Also supplied as round-to-square converted and cold-formed to drawing.
What we supply in this category
Square & Rectangular Steel Tube (HSS), 15×15 to 400×400Specifications & gradesView specifications →Hot-Dip Galvanized Square & Rectangular TubeSpecifications & gradesView specifications →Seamless Square Tube & Round-to-Square ConversionSpecifications & gradesView specifications →
Size range
| Product | Size range | Standard |
|---|---|---|
| Square tube (HSS) | 15×15 – 500×500 mm, WT 0.8 – 20 mm | GB/T 6728, EN 10219, ASTM A500 |
| Rectangular tube (RHS) | 20×10 – 500×300 mm, WT 0.8 – 20 mm | GB/T 6728, EN 10219 |
| Galvanized square / rect tube | □20×20 – □300×300 mm, zinc 30 – 700 g/m² | GB/T 6728, EN 10240 |
| Seamless square tube | □20×20 – □400×400 mm | GB/T 3094 |
| Round-to-square converted | On request | — |
| Length | 6 / 12 m, or cut to length | — |
Steel grades available
| Standard system | Grades |
|---|---|
| Carbon steel | Q195, Q215, Q235B, Q345B, Q355B, SS400 |
| European | S235JRH, S275J0H, S355J0H, S355J2H |
| American | A500 Gr.B, A500 Gr.C |
| Galvanized | Pre-galvanized or hot-dip galvanized, Z60 – Z275 coil equivalent |
Why buyers source this category from us
- Hollow sections are the cheapest tonne you can ship. Their high strength-to-weight ratio means a container carries more usable structure than with solid sections — real savings on long-haul freight.
- Galvanized in-house before delivery. Hot-dip galvanizing to 30 – 700 g/m², tested for coating mass and adhesion.
- Cut, drilled and notched to drawing. Suitable for direct assembly on site, reducing your labour cost.
- Seamless option for pressure or machining. Where a weld seam is unacceptable we supply seamless square tube to GB/T 3094.
Frequently asked questions
Do you supply pre-galvanized or hot-dip galvanized square tube?
Both. Pre-galvanized tube is made from zinc-coated coil and is the economical choice for general structures. Hot-dip galvanized tube gives a thicker, more uniform coating (30 – 700 g/m²) and is preferred for coastal and outdoor exposure.
What is the maximum wall thickness available?
Up to 20 mm for welded square and rectangular hollow sections, and up to roughly 30 mm for seamless square tube. Heavier sections are usually supplied as fabricated box sections.
Can you supply A500 Grade B or C?
Yes, both A500 Gr.B and Gr.C are available with mill test certificates.
How are hollow sections bundled?
Square bundles strapped at regular intervals, with end caps and a bundle tag. Timber dunnage is placed underneath for forklift handling at destination.
Other product categories
Sections & ProfilesPlates & SheetsPipes & TubesRound Bars & Long ProductsFlat BarsRailsFabrication & Export
Need a quotation for hollow sections & square tubes?
Send us the sizes, grades and quantities — we will come back with a firm offer including freight to your port.