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Help CenterWeather Resistant Galvanized RHS Hollow Section, GI Rectangular Steel Pipe for Greenhouse Construction
Product Spotlights
Q235B mild steel, stable mechanical property, high structural strength
Standard 6m length, support cut to your required size
Complete specifications: multiple square & rectangular sizes, various wall thickness available
Neat welding seam, smooth surface, no burr
Factory direct supply, ready stock, fast delivery
Widely used for greenhouse, fence, steel structure, support frame, engineering construction
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Introduction
Galvanized square and rectangular hollow section, also called GI square tube, is made of Q235B carbon steel. It is processed by cold forming and high-frequency welding, then hot dipped galvanized or pre-galvanized on the surface. The zinc coating firmly combines with the steel base, providing excellent anti-rust and anti-corrosion performance for outdoor use. Widely adopted in construction, greenhouse, fence, steel structure support and other engineering projects.
Specification Table
| Item | Details |
|---|---|
| Material Grade | Q235, Q235B |
| Standard | ASTM A500, EN10219, GB/T6728 |
| Surface | Hot Dipped Galvanized / Pre-galvanized |
| Zinc Coating | 40–120g/㎡, customizable |
| Shape | Square, Rectangular |
| Outer Dimension | 20×20mm ~ 200×200mm |
| Wall Thickness | 1.0mm ~ 8.0mm |
| Standard Length | 6m, cut to custom size available |
| Production Process | Cold formed + high frequency welded |
Key Advantages
✅ Strong Anti-corrosion PerformanceHot dip galvanized zinc layer is tightly bonded with steel substrate, effectively resisting rust and corrosion for outdoor and humid environments, extending service life greatly.
✅ Full Size Range & Custom CuttingRich inventory of square and rectangular hollow section in various dimensions. We can cut tubes to your target length, reducing your on-site machining work and saving labor cost.
✅ Stable Mechanical PropertyAdopt high-quality carbon steel raw material. ERW welding technology ensures good straightness, flat surface and reliable weld seam, strong bearing capacity.
✅ Complete Documents & Strict InspectionEvery batch will be inspected before shipment. 3.1 mill test certificate and SGS report can be provided to satisfy third-party inspection requirements for international projects.
✅ Factory Direct Supply & Flexible Trade TermsNo middleman markup, competitive factory price. We support multiple trade terms FOB, CFR, CIF, DDP. TT and LC payment are acceptable.
Application
Greenhouse frames, security fencing, steel structure buildings, support brackets, guardrails, project frames, outdoor fabrication.
Our Advantages
We are a professional steel supplier with abundant stock of galvanized hollow sections. Every batch will be strictly inspected before delivery. Custom cutting service is supported to match your project demands.
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