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Help CenterHot-dip Galvanized Square Steel Pipe，Q235B, Q355B, SS400, ST37, ST52
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1. Product Overview
Hot-dip galvanized square and rectangular steel tube is made of high-quality carbon steel strip through cold forming and high-frequency welding, then processed by hot-dip galvanizing (HDG) surface treatment. It forms a uniform, dense and strongly bonded zinc layer on the surface, which provides excellent anti-corrosion, anti-rust and weather resistance. It is widely used in construction, curtain wall, steel structure, greenhouse, machinery, shelf, guardrail and outdoor engineering projects.
2. Key Specifications
- Product Name: Hot-dip Galvanized Square Tube / Rectangular Tube
- Standard: GB/T 6728, ASTM A500, JIS G3466, EN Standards
- Material: Q235B, Q355B, SS400, ST37, ST52
- Size Range:
Square tube: 20×20mm – 600×600mm
Rectangular tube: 20×30mm – 500×800mm
- Wall Thickness: 0.8mm – 20mm
- Length: 6m, 12m, customized length available
- Zinc Coating: Regular ≥65μm, high zinc layer customizable
- Surface: Smooth HDG finish, no missing plating, no burrs
3. Product Features
- Excellent corrosion resistance: Stable zinc coating ensures long service life in outdoor, humid and corrosive environments.
- High dimensional accuracy: Regular shape, clear angle, good straightness, easy for installation and welding.
- High structural strength: Good bending, compression and impact resistance, stable load-bearing capacity.
- Easy processing: Can be welded, drilled, bent and cut directly, convenient for construction.
- Beautiful appearance: Bright and uniform zinc layer, suitable for exposed structures.
- Cost-effective: Wide application, low maintenance cost, long-term durability.
4. Main Applications
- Construction: Steel structure workshop, column, beam, support frame
- Curtain wall: Glass curtain wall keel, exterior wall support
- Municipal engineering: Road guardrail, street light pole, bus station
- Agriculture: Greenhouse framework, breeding shed
- Machinery & equipment: Machine frame, vehicle chassis, industrial support
- Logistics: Storage shelf, pallet, warehouse structure
- Outdoor projects: Billboard, carport, fence, canopy
5. Packaging & Delivery
- Packaging: Standard seaworthy export packing – steel strip binding, woven cloth wrapping, wooden pallet or iron pallet.
- MOQ: Small trial order acceptable.
- Delivery Time: In stock for fast shipment; customized order: 5–7days.
- Transportation: By sea, by land, suitable for global export.
6. Quality Assurance
- Raw materials with original MTC (Material Test Certificate)
- Full inspection: dimension, zinc thickness, bending test, surface quality
- Comply with international standards
- Accept third-party inspection: SGS, BV, etc.
- Provide inspection report and export certificates
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