Description
Vertically Integrated SHS Supply — From our own steel mill with 2,800+ specifications to finished hot dip galvanized square tubes, XJY Structure controls the full chain without third-party sourcing gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Tube |
| Product Type | Square / Rectangular Hollow Section (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, SGCC, CGCC, TDC51DZM, TDC52DTS350GD, TS550GD, DX51D+Z, A53 Grade B, A500 Grade A/B/C, STK400, SS400, ST42.2, S355JR |
| Standard | ASTM A53, ASTM A500, ASTM A36, ASTM A795, BS1387, EN10255, EN10219, EN10210, ISO65, ANSI C80, DIN2440, JIS G3444, JIS G3466, AS1163, GB/T3091, GB/T13793 |
| Section Shape | Square / Rectangular |
| Size Range | 21.3mm–660mm (1/2″–26″) |
| Wall Thickness | 1.5–33mm |
| Length | 5.8m / 6m / 11m / 12m / 6.4m (or custom) |
| Technique | Hot Rolled / Cold Rolled |
| Surface Treatment | Hot Dip Galvanized / Pre-Galvanized |
| Ends | Plain / Beveled / Threaded / Grooved |
| Tolerance | ±1% |
| Application | Steel structures, construction frames, fluid transport, machinery, building industry, boiler, petrochemical, hydraulic precision machinery parts, power |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Structure & Construction | Building frames, column-beam systems, portal frames for warehouses and factories |
| Industrial Facilities | Petrochemical pipe racks, boiler support structures, power plant scaffolding |
| Infrastructure & Machinery | Conveyor structures, crane booms, highway sign gantries, Belt & Road project scaffolding |
| EPC & General Contracting | Modular plant structures, equipment support platforms, connection assemblies |
Where EN10219 Certification Decides Customs Clearance for Your Hot Dip Galvanized Square Steel Tube
A missing CE mark or non-compliant MTC can hold an entire container at port — regardless of coating quality.
When procurement teams source galvanized hollow sections from overseas, the zinc coating often gets all the attention. But customs authorities in the EU and many Middle East markets check structural compliance first. If the hot dip galvanized square steel tube arrives without EN10219 or EN10210 documentation, or the mill test certificate doesn’t trace back to a recognized steel grade like S355JR, the shipment faces rejection or costly re-inspection. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections compliance requirements]
Beyond customs, engineering consultants reviewing shop drawings will flag material substitutions. A Q345 tube stamped as S355JR without proper equivalence documentation creates liability exposure for the general contractor. The gap between “looks galvanized” and “certified structural steel” is where projects lose weeks and budgets.
How Wall Thickness Tolerance Affects Structural Load Calculation
When engineers design a steel frame using hot dip galvanized square steel tube sections, they calculate load capacity based on nominal wall thickness. A ±1% tolerance means the actual section modulus stays within predictable range — critical for moment connections and bracing systems where even small deviations compound across a multi-story frame. Our cold rolling and hot rolling lines maintain this tolerance consistently across the 1.5–33mm wall range, whether you’re ordering 50mm SHS for purlins or 400mm sections for main columns. The ±1% control also ensures that galvanizing bath coverage remains uniform — thinner walls won’t over-absorb zinc while thicker sections get adequate coating penetration at corners.
Structural Compliance and Corrosion Protection Selection
Engineering specifications for hot dip galvanized square steel tube typically reference EN 1993 (Eurocode 3) or AISC 360 for load-bearing design, while corrosion protection follows EN ISO 1461 for hot dip galvanizing. In coastal or industrial environments, the zinc layer must meet minimum thickness requirements — typically 70μm for structural sections exposed to C3-C4 corrosion categories. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards] For projects in the EU, CE marking per EN10210 (seamless) or EN10219 (welded) is mandatory; North American projects require ASTM A500 Grade B/C compliance with proper heat number traceability. Custom lengths up to 12m reduce on-site welding, while beveled or grooved ends prepare the tube for direct mechanical connection without secondary processing.
Steel Grade Selection and Galvanizing Process Fundamentals
The steel grades we supply for hot dip galvanized square steel tube span three major classification systems: Chinese Q-series (Q195, Q235, Q345), European S-series (S355JR), and American ASTM grades (A53 Grade B, A500 Grade A/B/C). Each system defines minimum yield strength differently, but for standard structural applications, Q235 roughly corresponds to S235JR and A36, while Q345 aligns with S355JR and A500 Grade B. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Hot dip galvanizing immerses the fabricated tube in molten zinc at approximately 450°C, creating a metallurgical bond with the steel substrate. This differs from pre-galvanized (electro-galvanized) tubes, where the zinc layer is thinner and applied before forming. For structural frames exposed to weather or chemical environments, hot dip provides superior cathodic protection and self-healing at scratches. The silicon content in steel grades like Q235 affects zinc adhesion — high-silicon steels can produce thicker but more brittle coatings, which is why we match galvanizing parameters to specific grade chemistry.
Wall thickness directly influences both structural capacity and galvanizing quality. Thicker walls (above 6mm) retain heat longer during the galvanizing bath, ensuring uniform zinc-iron alloy formation. Our ±1% tolerance ensures that theoretical weight calculations match actual delivered weight — critical when invoicing by actual weight and avoiding disputes over short-weight claims.
Hidden Costs When Material Traceability Breaks Down
Ordering hot dip galvanized square steel tube based on price alone often leads to three invisible cost traps. First, fabricators sourcing raw tubes from third-party mills cannot guarantee heat number traceability — when the inspector asks for the MTC linking chemical composition to a specific steel batch, the supply chain goes dark. Second, coating thickness may meet the minimum on paper but fail at corners and edges where zinc drainage occurs during galvanizing. Third, without proper CE or ASTM certification, the shipment faces customs holds or rejection at the project site. [NEED_CITE: structural steel fabrication quality control and material traceability requirements]
These gaps don’t surface during procurement. They emerge during foundation pouring when the inspector requests documentation, or during final handover when the client’s QA team audits the material certification chain.
Why Project Teams Source Hot Dip Galvanized Square Steel Tube from XJY Structure
Our advantage starts at the steel mill. XJY Structure operates as the fabrication division of Shandong Xin Jiyuan Special Steel Tube Co., Ltd, meaning we produce the raw steel, form the tubes, and galvanize them within one integrated facility. This eliminates the traceability gap that occurs when a fabricator buys tubes from one source and galvanizes them at another.
We maintain 2,800+ specifications in inventory, covering the full range from 21.3mm to 660mm outer dimensions and 1.5–33mm wall thickness. Our engineering team reviews shop drawings before production begins, catching dimension conflicts or connection details that would cause rework on site. Every hot dip galvanized square steel tube ships with a complete documentation package: MTC with heat number, coating thickness report, dimensional inspection record, and welding procedure specifications if applicable.
For international projects, we hold CE certification to EN10210 and EN10219, ISO 9001 quality management, and accept third-party inspection from SGS, BV, or TUV before shipment. Our loading team specializes in oversized cargo — galvanized tubes require careful separation to prevent coating damage during transit, and our packing method uses rubberized edge protectors and steel strip bundling designed for ocean freight.
Documentation & Compliance
- Mill Test Certificate documenting Q235/Q345/S355JR chemical composition and mechanical properties per EN10219 or ASTM A500
- CE certificate covering EN10210 (seamless hollow sections) and EN10219 (welded hollow sections) for EU market access
- ISO 9001 quality management certificate covering steel production, tube forming, and galvanizing processes
- SGS or BV third-party inspection report verifying coating thickness, dimensional tolerance, and surface quality
- Material traceability by heat number linking each hot dip galvanized square steel tube to its original steel batch
- Customs documents including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Hot dip galvanized square steel tubes bundled with steel strips and rubberized edge protectors to preserve zinc coating during ocean transit
- Surface protection maintained through proper stacking separation — galvanized surfaces contact only non-metallic spacers to prevent scratching
- Container loading optimized for 5.8m and 6m lengths in 20ft containers, 11m and 12m lengths in 40ft open-top or flat-rack containers
- Custom cut-to-length service available for 6.4m or project-specific dimensions, reducing on-site waste and welding
- Heat number and steel grade stenciled on each tube end for site identification and inspection traceability
- Delivery terms FOB Qingdao, CIF destination port, or DDP project site with full export documentation and tracking
Start Your Procurement with Complete Technical Clarity
Send your project drawings (PDF/DWG), steel grade requirements, surface treatment preference, and destination port. We respond within 24 hours with a detailed quotation including material cost, galvanizing specification, production timeline, and shipping options — along with sample mill test certificates for your engineer’s review.
Request Quotation and Material Certification
Submit your specifications and receive a detailed quote with full documentation package within 24 hours.
Contact XJY Structure
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
