Description
Full-Range Galvanized Supply — 2,800+ sizes with wall thickness up to 40mm in stock for immediate dispatch
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Hollow Sections |
| Steel Grade | Q195–Q690, S235JR–S355J2, ASTM A500 Gr.A/B/C/D, EN 10219/10210, JIS G3466 STKR400/490, AS1163 C350/C350L0 |
| Standard | EN 10219, EN 10210, ASTM A500, JIS G3466, AS1163, GB/T 6728 |
| Section Shape | Square / Rectangular |
| Size Range | 12×12–800×800 mm (Square); 10×20–800×1000 mm (Rectangular) |
| Wall Thickness | Up to 40 mm |
| Length | 1–12 m |
| Technique | Hot Rolled / Welded |
| Surface Treatment | Galvanized |
| Application | Steel structures, glass curtain walls, architectural facades, machinery manufacturing, scaffolding, infrastructure projects, prefab buildings |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & EPC | Building frames, column supports, truss systems for commercial and industrial structures |
| Architectural Facade | Glass curtain wall framing, exterior cladding sub-structures, decorative facade elements |
| Infrastructure | Bridge railings, highway sign gantries, sound barrier supports, utility pole bases |
| Machinery Manufacturing | Conveyor frames, equipment bases, crane boom sections, hydraulic support structures |
| Prefab & Modular | Prefabricated warehouse skeletons, modular housing frames, container building structures |
What Galvanized Coating Thickness Costs on a Structural Frame Inspection
A zinc layer below specification triggers third-party rejection at the destination port — and the entire shipment goes back.
I have seen containers of galvanized square and rectangular steel tube arrive in the Middle East only to fail SGS coating-thickness testing on the dock. The contract called for a minimum galvanizing layer, yet the mill output fell short by a significant margin. The buyer faced full return freight, project delay penalties, and weeks of sourcing replacement material while the steel frame erection stood still. [NEED_CITE: hot-dip galvanized coating thickness requirements for structural steel] Beyond coating weight, buyers also encounter specification gaps — non-standard outer dimensions or heavy-wall sections that most mills simply do not roll — and certification mismatches where the mill test certificate references the wrong EN sub-clause, blocking EU customs clearance entirely.
Matching Galvanized Hollow Sections to Corrosive Outdoor Environments
Galvanized square and rectangular steel tube performs where bare welded sections would corrode within a single rainy season. The zinc layer acts as a sacrificial barrier, protecting both the outer face and — to a measurable degree — the inner cavity against atmospheric moisture, coastal salt spray, and industrial pollutants. For glass curtain wall framing and architectural facade sub-structures, the galvanized finish also eliminates the need for on-site painting, cutting both labor cost and VOC emissions at the installation stage. Our production lines cover the full 12×12 mm to 800×800 mm range with wall thickness up to 40 mm, meaning heavy-load columns and light gauge purlins can be sourced from a single supplier with consistent coating quality across every piece.
Structural Compliance and Certification Pathways by Market
Engineering designers specifying galvanized square and rectangular steel tube typically reference EN 1993-1-1 for European projects or AISC 360 for North American work, and the hollow section must carry matching dimensional and material documentation. [NEED_CITE: EN 10219 cold-formed hollow section requirements] For EU-bound orders, CE marking under EN 10210 or EN 10219 is mandatory — without the correct Declaration of Performance, the cargo cannot clear customs regardless of physical quality. ASTM A500 Gr.B/C shipments to North America require matching chemical and tensile reports tied to heat numbers. Our in-house physical and chemical laboratory tests every production batch for dimensional accuracy, mechanical properties, and coating adhesion before release, and third-party inspection through SGS or BV can be arranged at the buyer’s request.
Steel Grade Selection and Galvanizing Process Fundamentals
The steel grade chosen for galvanized square and rectangular steel tube directly determines load-bearing capacity and weldability on site. S235JR suits general structural framing where moderate yield strength is sufficient, while S355J2 delivers higher yield for long-span beams and heavily loaded columns — the jump from S-series to Q-series (Q355, Q460, Q690) follows the same principle with even greater strength for heavy industrial structures. [NEED_CITE: steel grade equivalence between EN and ASTM standards] The hot-dip galvanizing process immerses the formed and welded tube in a molten zinc bath, producing a metallurgically bonded coating that typically ranges from 45 μm to 85 μm depending on immersion time and steel chemistry. Silicon content in the steel affects coating thickness — higher silicon grades can produce thicker but more brittle zinc-iron alloy layers, so grade selection must balance structural demand with coating quality. Wall thickness tolerance under EN 10219 permits controlled variation, but excessive negative tolerance reduces both the theoretical weight per meter and the actual load capacity — a discrepancy that only surfaces during structural calculation or on-site weighing.
Hidden Costs When Galvanized Tube Specifications Are Not Verified
Ordering galvanized square and rectangular steel tube based on price alone, without verifying coating weight, dimensional tolerance, and material certification, creates costs that far exceed the initial savings. Coating below minimum specification leads to premature rust breakthrough and failed project handover inspections. Dimensional tolerance exceeding the standard causes welding misalignment and forces on-site re-cutting, adding labor days to the erection schedule. Missing or incorrect CE documentation holds cargo at port while demurrage charges accumulate. [NEED_CITE: structural hollow section tolerance standards and acceptance criteria] Material substitution — receiving a lower steel grade than specified — compromises structural safety and exposes the contractor to liability if the building authority requests traceability records during final inspection.
Procurement Confidence Built on Factory-Direct Control
As the original inventor of sharp-corner rectangular tube technology in China with 41 patents, we produce galvanized square and rectangular steel tube across 3 dedicated production lines covering over 2,800 specifications — from 12×12 mm micro-sections to 800 mm heavy-wall profiles with thickness up to 40 mm. Every order is tested in our own physical and chemical laboratory, and full mill test certificates are issued before shipment. We hold Lloyd’s CE certification for EN 10210 and EN 10219, ISO 9001:2015 registration, Singapore FPC approval, and verified reports from SGS and BV — covering exports to more than 50 countries across the EU, North America, Middle East, and Southeast Asia. Custom non-standard sizes, cut-to-length service, and professional container loading with anti-damage measures are standard, not exceptions. Our designated supplier status for major state-owned enterprises and listed companies reflects consistent quality under audit conditions.
Documentation & Compliance
- Mill test certificate documenting Q355B or S355JR chemical composition, yield strength, and tensile properties per EN 10219 or GB/T 6728
- CE certificate covering EN 10210 and EN 10219 for galvanized square and rectangular steel tube exported to EU member states
- ISO 9001:2015 quality management system certificate covering the full production and galvanizing process
- SGS or BV third-party inspection report verifying coating thickness, dimensional tolerance, and surface quality before loading
- Heat number traceability linking each galvanized square and rectangular steel tube bundle to its original melt and test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Galvanized square and rectangular steel tube bundled with high-tensile steel strips and fitted with edge protectors to preserve the zinc coating during ocean transit
- Anti-rust oil applied to cut ends and welded seams where the galvanized layer is interrupted, preventing localized corrosion during storage and shipping
- Container loading optimized by nesting smaller-section tubes inside larger rectangular profiles, maximizing payload per 20ft or 40ft container for sizes from 12×12 mm to 400×400 mm
- Cut-to-length service available for 1–12 m pieces, with each bundle labeled by steel grade, heat number, and dimensional specification
- Professional lashing and bracing using timber dunnage and wire ropes to prevent bundle shifting and tube-end damage during vessel rolling
- FOB, CIF, and DDP shipping terms supported with full export documentation and real-time tracking until port arrival
Securing Your Galvanized Tube Quotation with Full Certification
Submit your required section dimensions, steel grade, surface treatment preference, total tonnage, and destination port to receive a detailed quotation including unit price, production lead time, and applicable shipping terms. Our engineering team will confirm dimensional feasibility against the 2,800+ specification range and advise on CE or ASTM documentation requirements for your target market. Mill test certificates and third-party inspection arrangements are confirmed at the contract stage, ensuring full traceability from melt to delivery.
Frequently Asked Questions
Q: What steel grades are available for galvanized square and rectangular steel tube?
A: We supply Q195 through Q690, S235JR through S355J2, ASTM A500 Gr.A/B/C/D, JIS G3466 STKR400/490, and AS1163 C350/C350L0, with equivalent grade guidance across EN, ASTM, GB, and JIS systems.
Q: Can you produce non-standard dimensions outside the regular size range?
A: Yes, custom non-standard sizes are available alongside our standard range of 2,800+ specifications, with low minimum order quantities to support project-specific requirements.
Q: What certifications accompany galvanized square and rectangular steel tube for EU import?
A: Each shipment carries CE marking under EN 10210 or EN 10219, supported by Lloyd’s certification, ISO 9001:2015 registration, and mill test certificates with full chemical and mechanical data.
Q: How is the galvanized coating thickness verified before shipment?
A: Our in-house laboratory performs coating thickness testing on every production batch, and SGS or BV third-party inspection can be arranged at the buyer’s request for independent verification.
Q: What is the minimum order quantity for galvanized square and rectangular steel tube?
A: The minimum order quantity is 1 ton, with standard sizes available from stock and custom sizes entering production within typical lead times.
Request Your Galvanized Square and Rectangular Steel Tube Quotation Today
Send your specification sheet — including section size, wall thickness, steel grade, quantity, and destination port — to receive a complete quotation with mill test certificate commitment and shipping terms within 12 hours.
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
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
