Description
Factory-Direct Galvanized SHS/RHS — Integrated mill output and in-house fabrication eliminate material traceability gaps for Q195–Q345 hot dipped galvanized square and rectangular steel tubes.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | Q195, Q235, Q345, SGCC, CGCC, TDC51DZM, TDC52DTS350GD, TS550GD, DX51D+Z |
| Standard | ASTM A53, A500, A36, A795; BS1387; EN10255; ISO65; ANSI C80; DIN2440; JIS G3444; GB/T3091, GB/T13793; AS1163; JIS G3466; EN10219; EN10210 |
| Section Shape | Square / Rectangular |
| Size Range (Side Length / Outer Diameter) | 21.3 mm – 660 mm (1/2″ – 26″) |
| Wall Thickness | 1.5 – 33 mm |
| Length | 5.8 m / 6 m / 11 m or as required |
| Technique | Hot Rolled / Cold Rolled |
| Surface Treatment | Hot Dipped Galvanized / Pre-Galvanized |
| Tolerance | ±1% |
| Ends | Plain / Beveled / Threaded / Grooved |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Steel structures, construction frames, machinery, scaffolding, furniture, fluid transport, hydraulic precision machinery, power, boiler, petrochemical, building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC & General Contracting | Load-bearing frames for warehouses, logistics centers, and industrial plants |
| Construction & Scaffolding | Scaffold uprights, cross braces, and temporary support towers |
| Power & Petrochemical | Pipe racks, cable tray supports, and boiler structural bracing |
| Machinery & Hydraulic Systems | Cylinder housings, conveyor frames, and precision equipment bases |
| Building & Architecture | Column casings, canopy structures, and mezzanine grids |
Where Material Traceability Breaks Down on a Galvanized SHS/RHS Order
A missing heat number on a zinc-coated tube can halt customs clearance and void structural sign-off.
Procurement teams sourcing hot dipped galvanized square and rectangular steel tubes from overseas often discover, at the inspection stage, that the mill test certificate does not match the physical shipment, or that the galvanizing subcontractor cannot link the zinc coating thickness back to the original steel heat. This fragmentation — raw material from one mill, forming at a second workshop, galvanizing at a third — creates documentation gaps that EU notified bodies and ASTM-specifying engineers will not accept. [NEED_CITE: EN 1090 structural steel fabrication traceability requirements]
Matching Wall Thickness and Zinc Finish to Structural Duty
A Hot Dipped Galvanized Square and Rectangular Steel Tube in Q345 with 10–33 mm wall thickness serves primary load-bearing frames where both structural capacity and long-term corrosion resistance are specified. Thinner-walled sections in Q195 or Q235, typically 1.5–5 mm, fit scaffolding, furniture, and non-primary bracing where formability and cost matter more than yield strength. The choice between hot dipped and pre-galvanized finish depends on the exposure environment: hot dipped coatings suit outdoor, industrial, and coastal sites, while pre-galvanized tubes are adequate for indoor, dry, or short-lifespan applications.
Engineering Compliance Across EN, ASTM, and JIS Frameworks
Structural frames designed to EN 1993-1-1 require hollow sections conforming to EN 10210 (hot finished) or EN 10219 (cold formed), with CE marking mandatory for EU market entry. Projects specifying ASTM A500 Grade B or C need documented yield strength and chemical composition traceable to the original heat. [NEED_CITE: steel grade equivalence between EN and ASTM standards] Galvanized SHS/RHS supplied under GB/T3091 or JIS G3466 can be cross-referenced, but the mill test certificate must explicitly state the governing standard. Dimensional tolerance of ±1% on side length and wall thickness ensures fit-up accuracy on site, reducing secondary cutting and re-welding.
Steel Grade Selection and Galvanizing Process Explained
Q195 and Q235 are mild structural grades offering good weldability and formability, suitable for light frames and scaffolding. Q345 provides higher yield strength for primary structural members in warehouses and industrial buildings. The DX51D+Z and TDC51DZM series are cold-rolled substrate grades designed for galvanizing, balancing coating adhesion with forming performance. Hot dipped galvanizing immerses the formed tube in molten zinc, producing a metallurgically bonded coating that protects both the outer surface and, through the zinc-iron alloy layers, the weld zones. Pre-galvanized tubes are manufactured from already-coated coil, giving a thinner but more uniform coating — the trade-off is exposed bare steel at cut edges unless touched up on site. [NEED_CITE: hot dipped vs pre-galvanized coating performance comparison]
Hidden Costs of Incorrect Grade or Coating Specification
Ordering pre-galvanized tubes for an outdoor coastal warehouse frame, when the engineer specified hot dipped, leads to premature coating breakdown, costly re-coating, or full section replacement. Supplying Q195 where Q345 was called for may pass visual inspection but fails structural load testing, triggering rejection and project delay. Missing CE documentation on EN10219 sections destined for the EU results in customs holds and demurrage charges that can exceed the tube cost itself. [NEED_CITE: consequences of non-compliant structural steel procurement]
Why Buyers Specify XJY Structure for Galvanized SHS/RHS
XJY Structure operates as the fabrication division of a Shandong-based steel producer with three rolling lines and over 2,800 raw material specifications in stock, meaning the same facility controls the steel chemistry, the tube forming, and the galvanizing process. In-house理化实验室 test coating thickness, adhesion, and dimensional accuracy before dispatch — every heat number is traceable from the mill certificate to the bundled tube. Third-party inspection by SGS, BV, or TÜV is arranged on request, with full documentation packages prepared for EU CE marking or ASTM project submittals. Custom non-standard sizes,定尺 cutting, and end finishing (beveled, threaded, grooved) are handled in-house, avoiding the coordination delays of multi-supplier chains. Professional loading plans maximize container utilization for 5.8 m and 6 m lengths, with edge protectors preserving the zinc coating during ocean transit.
Documentation & Compliance
- Mill Test Certificate documenting Q195/Q235/Q345 chemical composition and mechanical properties per heat number, aligned with GB/T3091 or EN10219 as specified
- CE certificate for cold-formed galvanized RHS conforming to EN10219, required for structural steelwork entering EU member states
- ISO 9001 quality management certificate covering the integrated steel production and fabrication process
- SGS or BV third-party inspection report verifying coating thickness, dimensional tolerance, and visual quality before shipment
- Material traceability sheet linking each bundled tube to its heat number, steel grade, and galvanizing batch
- Export customs documents including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Hot dipped galvanized Q235 and Q345 SHS/RHS bundled with steel strips and edge protectors to prevent zinc coating damage during handling and ocean freight
- Pre-galvanized tubes in Q195 and DX51D+Z grades packed in seaworthy bundles with waterproof wrapping to maintain surface finish in humid transit conditions
- Container loading optimized for 5.8 m and 6 m standard lengths in 20ft and 40ft units, with 11 m lengths shipped in open-top or flat-rack containers
- Custom cut-to-length services available for 定尺 orders, with cut ends protected by plastic caps or rust-inhibitive paint to prevent edge corrosion
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping terms supported, with door-to-door logistics coordinated for EPC project sites
Starting Your Galvanized SHS/RHS Procurement
Share your project drawings, steel grade requirements, coating specification (hot dipped or pre-galvanized), and destination port to receive a detailed quotation including material, fabrication, coating, and shipping costs. Our engineering team reviews shop drawings and confirms dimensional feasibility within 24 hours, with full mill test certificates and third-party inspection options outlined in the proposal.
Request a Quotation with Full Mill Documentation
Submit your specifications, required standards, and target quantity to receive pricing, production lead times, and compliance documentation.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
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
Frequently Asked Questions
Q: How do Q235 and Q345 steel grades map to European S-series and ASTM equivalents?
A: Q235 corresponds broadly to S235JR in EN standards and ASTM A36 in the US system, while Q345 aligns with S355JR and ASTM A572 Grade 50. Full chemical composition and mechanical property cross-references are provided in the mill test certificate for each heat.
Q: Can you arrange third-party inspection before shipment?
A: Yes, SGS, BV, and TÜV inspections are available for quantity, dimensional accuracy, coating thickness, and visual quality verification. Inspection reports are included in the export documentation package.
Q: What is the difference between hot dipped and pre-galvanized finish for SHS/RHS?
A: Hot dipped galvanizing produces a thicker, metallurgically bonded zinc coating suitable for outdoor and corrosive environments, while pre-galvanized tubes offer a thinner, more uniform coating ideal for indoor or short-lifespan applications. The choice depends on your project’s exposure conditions and design life.
Q: What is the MOQ for custom non-standard sizes?
A: The standard MOQ is 1 Ton. Custom dimensions outside the 21.3 mm–660 mm range or non-standard wall thicknesses are subject to mill production scheduling, with typical lead times confirmed upon drawing review.
Q: How are galvanized tubes packed and loaded for export?
A: Tubes are bundled with steel strips, fitted with edge protectors to preserve the zinc coating, and loaded into containers optimized for 5.8 m and 6 m lengths. Custom packing and open-top container options are available for 11 m lengths or oversized sections.
