Description
Factory-Direct Galvanized SHS/RHS — XJY Structure operates its own steel mill with 3 production lines and 2,800+ specifications, delivering Hot Dipped Galvanized Square Steel Tube directly from raw material to finished component without third-party markup.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q215, Q235, Q345, 10#, 20#, 45#, 16Mn, A53 (Grade A/B), St37, St42, St35.4, St52.4, ASTM Grade B/C/D/50 |
| Standard | BS, EN, GB, AISI, ASTM, DIN, JIS |
| Section Shape | Square / Rectangular / Round |
| Size Range | 10mm–1000mm outer diameter |
| Wall Thickness | 0.6–28mm |
| Length | 1–12m |
| Technique | ERW / Hot Rolled / Cold Rolled |
| Surface Treatment | Hot Dip Galvanized / Pre-Galvanized, PVC Coated, Black, Color Painted, Oiled, Bared, 3PE |
| Zinc Coating | 30–275g/m² |
| Ends | Plain / Beveled / Threaded with Couplings or Sockets |
| Application | Solar power structures, construction frames, machinery, scaffolding, bridges, industrial platforms |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Solar Energy EPC | Photovoltaic mounting structures, ground screw bases, panel support rails |
| Commercial Construction | Building frames, mezzanine platforms, stairway handrails, column supports |
| Industrial Infrastructure | Machinery frames, conveyor structures, warehouse racking systems, equipment platforms |
| Civil Engineering | Bridge handrails, scaffolding uprights, noise barrier posts, signage gantries |
Where EN 10219 Certification Decides Customs Clearance for Hot Dipped Galvanized Square Steel Tube
Missing EN 10219 compliance documentation is the single most common reason galvanized hollow sections get held at EU ports.
When European general contractors or EPC firms order Hot Dipped Galvanized Square Steel Tube from Chinese fabricators, the galvanizing process itself rarely causes rejection — it is the paperwork gap. CE marking under EN 10219 requires a Factory Production Control certificate, Declaration of Performance, and traceable mill test certificates linked to heat numbers. Many trading companies source tubes from multiple mills and cannot provide consistent documentation chains. Buyers discover this only when goods arrive at Rotterdam or Hamburg and customs brokers flag incomplete technical files. The result is weeks of storage fees, re-inspection costs, and project delays that far exceed the original price difference between a trading company and a certified manufacturer [NEED_CITE: EN 10219 cold-formed hollow section certification requirements for EU import].
How Wall Thickness and Zinc Coating Align with Solar Mounting Engineering Demands
Solar power support structures demand a specific balance between structural rigidity and long-term corrosion resistance. Hot Dipped Galvanized Square Steel Tube in wall thicknesses from 1.5mm to 6mm provides the load-bearing capacity required for panel arrays while the 65–100μm zinc coating (equivalent to 30–275g/m² range) ensures 25-year service life in outdoor environments. The square and rectangular cross-sections offer superior torsional resistance compared to round tubes, making them ideal for cantilevered panel mounts and ground-based tracking systems. Our ERW welding process ensures consistent seam integrity across the full length, and the hot dip galvanizing covers both external and internal surfaces uniformly — critical for hollow sections exposed to condensation cycles in desert or coastal solar farms.
Structural Load Compliance and Steel Grade Selection for Engineering Projects
Load-bearing applications require steel grades that meet specific yield strength thresholds defined by EN 1993 (Eurocode 3) or AISC 360. Q235 and Q345 grades in the GB system correspond to S235 and S355 in the EN system and ASTM A36/A572 in the American framework, though exact chemical composition and impact test requirements vary [NEED_CITE: steel grade equivalence between GB Q-series and EN S-series standards]. For Hot Dipped Galvanized Square Steel Tube used in building frames or industrial platforms, S355-grade equivalents provide higher load capacity with reduced section weight. The cold-forming process under EN 10219 introduces corner radius variations that affect connection design — sharp-corner tubes offer tighter fit-up for bolted connections while rounded corners improve stress distribution under dynamic loads. Third-party inspection by SGS or BV verifies both dimensional tolerances and coating thickness before shipment, eliminating disputes at destination ports.
Understanding Steel Grade Systems and ERW Welding Quality in Galvanized Tubes
The steel grade designations Q195, Q235, and Q345 originate from the Chinese GB/T 700 and GB/T 1591 standards, where the number indicates minimum yield strength in MPa. These grades serve general structural applications where welding, forming, and galvanizing compatibility are essential. The ASTM A53 Grade A/B specification covers Hot Dipped Galvanized Square Steel Tube for mechanical and pressure applications, with Grade B offering higher tensile strength for load-bearing frames. European projects typically specify S235JR or S355JR under EN 10025, which requires Charpy impact testing at room temperature — a detail often omitted in quotations from non-certified suppliers. The ERW (Electric Resistance Welding) process used for these tubes creates a longitudinal seam that, when properly heat-treated and galvanized, achieves full母材 strength. Hot dip galvanizing at 450°C zinc bath temperature ensures metallurgical bonding of the zinc-iron alloy layers, providing cathodic protection that pre-galvanized (electro-galvanized) coatings cannot match for outdoor structural applications.
The Hidden Cost of Negative Tolerance and Inconsistent Zinc Coating
Purchasing Hot Dipped Galvanized Square Steel Tube at the lowest unit price often masks three cost traps: negative tolerance exceeding allowable limits, zinc coating below specification, and missing material traceability. When wall thickness falls below the minimum permitted by EN 10219-2 or ASTM A500, the structural engineer’s load calculations become invalid, forcing redesign or rejection during site inspection. Zinc coating measured at 40μm instead of the specified 65μm accelerates corrosion in industrial or marine environments, reducing service life from decades to years. Most critically, tubes without heat-number traceability cannot be verified against mill test certificates, creating liability exposure for the general contractor and potential insurance claim denials [NEED_CITE: structural steel quality control requirements for imported fabricated components]. These issues surface not during procurement but during installation, third-party inspection, or — worst case — structural failure, at which point remediation costs dwarf the original savings.
Why Project Procurement Teams Choose Vertically Integrated Manufacturing
XJY Structure operates as the dedicated structural steel fabrication division of Shandong Xin Jiyuan Special Steel Tube Co., Ltd, combining raw steel production with downstream fabrication under one quality management system. This vertical integration means the Hot Dipped Galvanized Square Steel Tube you order comes from our own 3 production lines with 2,800+ specifications in stock — not sourced from competing mills and resold with markup. Our in-house理化实验室 issues mill test certificates for every heat, and our certified welding procedures (WPS/PQR) comply with AWS D1.1 and EN ISO 15614 standards. For European projects, we hold CE certification under EN 10219 and EN 10210, with complete Declaration of Performance documentation. For Middle East and Southeast Asian infrastructure, we provide SGS or BV third-party inspection reports alongside material traceability by heat number. Our engineering team reviews shop drawings before production begins, identifying dimension conflicts or material optimization opportunities that prevent costly field modifications. Professional loading plans for oversized components and complete export documentation packages ensure smooth customs clearance at destination ports across 50+ countries.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB/T 700, with heat number traceability for every bundle
- CE certificate confirming Hot Dipped Galvanized Square Steel Tube compliance with EN 10219-1 and EN 10219-2 for EU market access
- ISO 9001:2008 quality management system certificate covering steel production, fabrication, and galvanizing processes
- SGS or BV third-party inspection report verifying zinc coating thickness (30–275g/m²), dimensional tolerances, and surface quality before shipment
- Material traceability sheet linking each tube bundle to its heat number, steel grade, and production date for project quality archives
- Complete customs documentation package including packing list, bill of lading, certificate of origin, and commercial invoice formatted for destination country requirements
Packaging, Loading & Delivery
- Hot Dipped Galvanized Square Steel Tube bundled with high-tensile steel strips and edge protectors to preserve zinc coating integrity during ocean transit and prevent bundle deformation
- Galvanized surface protected by waterproof wrapping or plastic caps on tube ends to prevent white rust formation from condensation during container shipping
- 6m and 12m standard lengths optimized for 20ft and 40ft container loading, with custom cutting available to match project-specific dimensions and reduce on-site waste
- Each bundle tagged with heat number, steel grade (Q235/Q345/A53), outer diameter, wall thickness, and production date for immediate site identification
- FOB Qingdao port for standard orders, with CIF and DDP options available for project sites requiring door-to-door logistics coordination
- Professional loading plans for oversized rectangular tubes exceeding standard container dimensions, ensuring proper weight distribution and lashing for safe arrival
How to Initiate Your Procurement Process for Hot Dipped Galvanized Square Steel Tube
Submit your project specifications including steel grade (Q235/Q345/A53), outer dimensions, wall thickness, total quantity, and destination port to receive a detailed quotation within 24 hours. Our engineering team will review your drawings, confirm EN 10219 or ASTM A500 compliance requirements, and provide mill test certificate samples alongside the commercial offer. For non-standard dimensions or custom zinc coating specifications, we will propose fabrication alternatives based on our 2,800+ specification inventory to optimize both cost and delivery timeline.
Request Your Quotation and Mill Test Certificate
Send your project drawings and specifications to admin@xjystructure.com or contact us via WhatsApp at +86 188 5315 7756 to receive pricing, material documentation, and delivery scheduling for your Hot Dipped Galvanized Square Steel Tube requirement.
