QIDAMT
Q235B round steel tube hot-dip galvanized for scaffolding, fencing, greenhouse and structural applications.
Hot-dip galvanized round steel tube is manufactured from Q235B welded pipe and zinc-coated in a hot-dip bath. The thick zinc layer (typically 45–85 μm) protects both the outer surface and the pipe bore, giving decades of service in outdoor and humid environments. It is the preferred tube for scaffolding, railings and structural supports.
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: 45 – 85 μm (≥ 275 g/m²)
- Density: 7.85 g/cm³
Standard Sizes
| Parameter | Range |
|---|---|
| Outside diameter | 21.3 – 219.1 mm (1/2″ – 8″) |
| Wall thickness | 1.0 – 6.0 mm |
| Length | 6 m standard, cut to order |
| Zinc layer | 45 – 85 μm (Z275 or higher) |
| Standard | GB/T 3091 / EN 10255 / ASTM A53 / ISO 1461 |
Applications
Hot-dip galvanized round tube is used for scaffolding and shoring, highway and balcony railings, greenhouse frames, agricultural and livestock fencing, water supply and sprinkler lines, cable conduit, flagpoles, playground equipment and general structural supports. For square and rectangular profiles see our pre-galvanized square & rectangular tube.
Processing & Packaging
Cutting, threading, drilling and bending available. Tubes are bundled with steel straps, capped and packed in wooden crates or pallets.
Send OD, wall thickness, length, zinc layer and quantity — we confirm price within 24 hours.
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