Q235B square and rectangular tube with pre-galvanized coating for frames, racks, solar supports and fencing.
Pre-galvanized square and rectangular steel tube is formed from galvanized strip and welded into a closed section, then cut to length. The zinc coating covers the whole surface including corners, and the clean, bright finish makes it ready for use or painting without further treatment — ideal for racks, frames and structural sections.
Key Advantages
Chemical Composition (Q235B Base)
| Element | C | Mn | Si | P | S | Fe |
|---|---|---|---|---|---|---|
| Content % | 0.12 – 0.20 | 0.30 – 0.70 | ≤ 0.30 | ≤ 0.045 | ≤ 0.045 | Balance |
Mechanical Properties
- Yield strength: ≥ 235 MPa
- Tensile strength: 370 – 500 MPa
- Elongation (δ): ≥ 26 %
- Zinc coating: 20 – 40 μm (Z60 – Z120)
- Density: 7.85 g/cm³
Standard Sizes
| Parameter | Range |
|---|---|
| Square section | 20×20 – 200×200 mm |
| Rectangular section | 20×30 – 150×200 mm |
| Wall thickness | 0.8 – 8.0 mm |
| Length | 6 m standard, cut to order |
| Standard | GB/T 6728 / EN 10219 / ASTM A500 / JIS G3466 |
Applications
Pre-galvanized square and rectangular tube is used for storage racks and display frames, solar panel mounting structures, greenhouse frames, guardrail posts and fencing, furniture frames, garage and gate structures, tent and awning frames, and light structural sections. For round profiles see our hot-dip galvanized round tube.
Processing & Packaging
Cutting, drilling, punching and bending available. Tubes are bundled with steel straps and packed in wooden crates or on pallets with corner protection.
Send section size, wall thickness, length and quantity — we confirm price within 24 hours.
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