Description
Factory-Direct Galvanized Supply — Hot-dip galvanized square steel tubes produced on 3 dedicated lines covering 2,800+ specifications, shipped with full mill test certificates and Lloyd’s CE documentation.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Tube |
| Product Type | Galvanized Square Steel Tube |
| Steel Grade | A53 Grade B, A500 Grade A/B/C, STK400, SS400, ST42.2, S355JR, Q195–Q690 |
| Standard | ASTM A53, A500, A36, A795; BS1387; EN10255; ISO65; ANSI C80; DIN2440; JIS G3444; GB/T3091, GB/T13793 |
| Section Shape | Square |
| Size Range | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 6 mm (customizable) |
| Length | 5.8 m / 6 m / 11 m or as customer needs |
| Technique | Hot-dip Galvanizing |
| Surface Treatment | Galvanized |
| Tolerance | ±1% |
| Ends | Plain ends, Beveled ends, Threaded ends, Grooved ends |
| Processing Service | Punching, Cutting, Bending |
| Application | Oil/gas/water fluid transportation, construction, hydraulic precision machinery parts, power, boiler, petrochemical, building industry, municipal water & gas transmission |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Municipal Infrastructure | Water mains, gas distribution networks, fire hydrant risers, drainage columns |
| Construction & Steel Structures | Building frames, scaffolding uprights, curtain wall support mullions, column bases |
| Machinery & Industrial Equipment | Hydraulic cylinder housings, conveyor frame members, petrochemical pipe racks |
| Power & Energy | Solar mounting structures, substation support frames, boiler feed lines |
What Negative Tolerance on Wall Thickness Really Costs a Municipal Project
A 0.3 mm zinc coating shortfall means the entire batch fails third-party inspection at destination port.
I once loaded a container of galvanized square tubes for a Middle East municipal water project. The wall thickness had been pushed to the lower limit of negative tolerance at the rolling stage, and the zinc coating weight came in below the 500 g/m² threshold specified in the contract. When SGS inspectors checked at Jebel Ali, they rejected the full lot. The client had to reorder on an emergency basis, paying air freight premiums on top of the replacement cost. Since that shipment, I personally verify coating weight and dimensional tolerance before every galvanized square steel tube leaves the line. [NEED_CITE: hot-dip galvanizing coating thickness requirements per ASTM A123]
Matching Galvanized SHS to Corrosive Municipal Environments
Hot-dip galvanizing deposits a metallurgically bonded zinc-iron alloy layer that outperforms paint or electroplating in buried and splash-zone conditions. For municipal water and gas transmission, the Galvanized Square Steel Tube in S355JR or A53 Grade B provides both structural rigidity and long-term corrosion protection without secondary coating. Our 3 production lines cover side lengths from 21.3 mm to 660 mm with wall thickness up to 6 mm and beyond, so engineers can specify one supplier for both small-bore service lines and large-distribution headers.
Structural Compliance and Certification Pathways
Municipal and structural projects in the EU require CE marking under EN 10210 (hot-finished) or EN 10219 (cold-formed) for hollow sections, while North American specifiers reference ASTM A500 and A53. Galvanized Square Steel Tube orders shipped from our facility carry Lloyd’s CE certification covering EN 10210/10219, Singapore FPC approval, and SGS/BV third-party inspection reports — documentation that clears customs without delay. [NEED_CITE: CE marking requirements for structural hollow sections under EN 10219] Wall thickness tolerance of ±1% ensures that theoretical weight calculations match actual delivered weight, avoiding disputes during project handover.
Steel Grade Selection and Hot-Dip Galvanizing Process
The steel grades we offer — A53 Grade B, A500 Grade A/B/C, S355JR, STK400, SS400, and Q195–Q690 — span the ASTM, EN, JIS, and GB systems, allowing direct substitution when projects cross borders. S355JR delivers higher yield strength than S235JR for load-bearing frames, while A53 Grade B remains the default for pressure-rated fluid conveyance. Hot-dip galvanizing immerses the formed square tube in molten zinc at approximately 450°C, creating a coating of 500–700 g/m² that resists corrosion for decades in atmospheric and mildly aggressive soil conditions. The silicon content in the base steel affects coating thickness and appearance; our in-house laboratory checks chemistry before galvanizing to prevent reactive steel from producing excessively thick, brittle coatings. [NEED_CITE: influence of steel silicon content on hot-dip galvanizing coating quality]
The Hidden Price of Wrong Grade or Missing Certificates
Ordering Q235B when the drawing calls for S355JR means the structure fails load testing — and replacement requires cutting out installed members, not just swapping stock. Shipping galvanized square tubes to the EU without EN 10219 compliance documentation results in customs holds that stall crane schedules and trigger liquidated damages. [NEED_CITE: consequences of non-compliant steel grade substitution in structural engineering] A missing or incomplete mill test certificate forces the client to commission independent chemical analysis at their own cost, adding weeks to the approval chain.
Why Engineers Source Galvanized Square Steel Tube From SD XJY Pipe
We operate 3 dedicated production lines covering 2,800+ specifications — from 21.3 mm small-bore tubes to 660 mm heavy-wall sections — so you consolidate orders instead of splitting across four suppliers. Our in-house physical and chemical laboratory tests every heat for dimensional accuracy, mechanical properties, and zinc coating weight before release. We hold 41 invention patents, including China’s original sharp-corner rectangular tube technology, and maintain full ISO 9001:2015, Lloyd’s CE (EN 10210/10219), and Singapore FPC certifications. Custom non-standard sizes, cutting, punching, and bending are handled in-house with low MOQ of 1 Ton. Professional container loading with anti-damage measures prevents zinc coating scratches and tube deformation during ocean freight.
Documentation & Compliance
- Mill test certificate documenting S355JR or A53 Grade B chemical composition and mechanical properties per heat number, conforming to EN 10204 3.1
- Lloyd’s CE certificate covering EN 10210/EN 10219 for structural hollow sections exported to European markets
- ISO 9001:2015 quality management system certificate covering hot-dip galvanizing and tube forming processes
- SGS or BV third-party inspection report verifying coating thickness, dimensional tolerance, and visual quality before shipment
- Material traceability report linking each bundle to heat number, steel grade, and galvanizing batch
- Full customs documentation including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Galvanized Square Steel Tube bundled with high-tensile steel strips and edge protectors to preserve the zinc coating during handling and ocean transit
- Both ends fitted with plastic caps to prevent moisture ingress and thread damage on beveled or threaded ends
- Woven bag wrapping over bundles for additional surface protection, with heat number and steel grade stenciled on each bundle
- 5.8 m, 6 m, and 11 m lengths optimized for 20ft and 40ft container loading; custom cut-to-size available to maximize payload per shipment
- Professional container loading plan with timber dunnage and anti-roll bracing to prevent tube bending and coating abrasion
- FOB, CIF, and DDP shipping terms available with full tracking until destination port or project site
Getting Your Galvanized Square Steel Tube Quote Started
Send us the side length, wall thickness, steel grade, quantity, and destination port — we return a detailed quotation within 12 hours, including unit price, lead time, and shipping terms. If your project requires non-standard dimensions or specific end finishing, we provide a custom production plan with mill test certificate and CE documentation confirmed upfront.
Request Your Galvanized Square Steel Tube Quotation
Submit your specification sheet — side length, wall thickness, steel grade, quantity, and destination — to receive pricing, mill test certificates, and loading plans within 12 hours.
Contact SD XJY Pipe
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
