Description
Factory-Direct Galvanized Hollow Sections — Vertically integrated from raw steel production to finished galvanized square and rectangular steel tube, eliminating the gap between material supplier and fabricator.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (Hollow Section) |
| Steel Grade | Q235, Q345, S235JR, S275JR, STK400, STK500, SGCC, CGCC, DX51D |
| Standard | GB/T 3091, BS1387, EN39, EN1139, ASTM A53, JIS G3444 |
| Section Shape | Square / Rectangular |
| Size Range | 21.3–3048 mm (side length); 1/8–36 inch (10.3–914.4 mm) |
| Wall Thickness | 0.8–50 mm |
| Length | 2000–12000 mm (Random / Fixed / SRL / DRL / Customized) |
| Technique | Hot Rolled Based / ERW |
| Surface Treatment | Electroplated galvanized (zinc 10–50 g/m²), Pre-painted galvanized (zinc 60–120 g/m²), Hot-dipped galvanized (zinc 120–500 g/m²) |
| Ends | Plain end / Beveled end / Threaded end |
| Application | Steel structure projects / Low-pressure liquid delivery / Construction frames / Scaffolding / Machinery |
| MOQ | 5 tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Structure & EPC | Building frames, column-beam assemblies, truss systems for industrial warehouses and commercial facilities |
| Construction & Scaffolding | Scaffold uprights, ledger braces, support towers, temporary formwork frames |
| Infrastructure | Low-pressure water and gas distribution pipelines, drainage structures, utility support frames |
| Machinery & Industrial | Conveyor structures, equipment support platforms, machine base frames |
Where Coating Weight Selection Determines Service Life on Galvanized Square and Rectangular Steel Tube Projects
Electroplated, pre-painted, and hot-dipped galvanized tubes serve fundamentally different corrosion environments — specifying the wrong zinc layer wastes budget or compromises durability.
When sourcing galvanized square and rectangular steel tube for outdoor structural frames in coastal or industrial zones, buyers often receive electroplated sections (10–50 g/m² zinc) quoted as “galvanized” without distinguishing the process. That coating may survive indoor storage racks but will show white rust within months in a humid port-side warehouse project. Meanwhile, a hot-dipped specification (120–500 g/m²) on an interior mezzanine frame adds cost that the environment never demands. [NEED_CITE: zinc coating weight selection for galvanized steel in different corrosion categories]
Fragmented procurement compounds this: the material supplier ships one coating class, the fabricator assumes another, and the gap surfaces only at site inspection. With vertically integrated production controlling both base steel and galvanizing line, coating weight stays consistent from mill test certificate to final bundle.
Matching Wall Thickness and Section Geometry to Structural Load Paths
A galvanized square and rectangular steel tube selection for warehouse portal frames must balance bending resistance against self-weight, particularly when long spans (6–12 m members) are involved. Rectangular sections offer higher moment of inertia about the strong axis, making them efficient for beam applications, while square sections distribute load evenly across biaxial bending in column roles. The 0.8–50 mm wall thickness range covers everything from light-duty scaffolding uprights to heavy-load industrial platform columns. Our engineering team reviews shop drawings to confirm section suitability before fabrication, reducing the risk of on-site reinforcement rework that delays EPC schedules.
Engineering Compliance Across EN, ASTM, and JIS Frameworks
International steel structure projects require material certification aligned with the design code specified by the structural engineer — EN 10219 for European cold-formed hollow sections, ASTM A53 / A500 for North American frameworks, or JIS G3444 for Japanese-standard structural tubes. A single galvanized square and rectangular steel tube order shipped to the Middle East may need EN 10204/3.1B mill test certificates, CE marking for EU-bound components, and SGS third-party inspection for client-mandated quality verification. Multi-standard compliance across GB/T 3091, BS1387, EN39, EN1139, ASTM A53, and JIS G3444 allows procurement consolidation from one source rather than splitting orders across regional suppliers. [NEED_CITE: steel grade equivalence between EN and ASTM standards for hollow sections]
Steel Grade Selection and Galvanizing Process Fundamentals
The Q-series (Q235, Q345) dominates Chinese domestic projects and Belt & Road infrastructure where GB/T 3091 governs, offering adequate yield strength for general structural use at competitive cost. The S-series (S235JR, S275JR) aligns with European EN standards and provides guaranteed impact toughness at sub-zero temperatures — critical for projects in Northern Europe or high-altitude regions. STK400 and STK500 serve Japanese-spec structural applications with tighter carbon equivalents for weldability. SGCC, CGCC, and DX51D are cold-forming grades typically used as the base steel for galvanizing, where formability matters more than structural load-bearing.
Hot-dip galvanizing (120–500 g/m²) metallurgically bonds zinc to the steel substrate, providing sacrificial cathodic protection that continues even if the coating is scratched. Pre-painted galvanized (60–120 g/m²) adds an organic top layer for aesthetic or moderate chemical resistance requirements. Electroplated galvanized (10–50 g/m²) produces a thinner, more uniform coating suited to indoor or dry environments where appearance and dimensional precision outweigh corrosion demands. [NEED_CITE: hot-dip vs electroplated galvanized coating performance comparison]
Hidden Costs When Galvanized Square and Rectangular Steel Tube Specifications Drift
Ordering Q345 but receiving Q235 with a forged mill test certificate creates structural safety liability that only emerges during load testing or inspector audit. Specifying hot-dip galvanized (275 g/m² minimum) but accepting electroplated stock leads to premature coating failure, forcing full re-galvanization at destination — a cost that typically exceeds the original material price difference by several multiples. Missing EN 10204/3.1B documentation triggers customs holds at EU ports, where type 3.1 certificates are mandatory for structural steel under the Construction Products Regulation. [NEED_CITE: EN 10204 inspection document types for steel products]
Why Project Procurement Teams Source Galvanized Square and Rectangular Steel Tube From XJY Structure
Our own steel mill with three production lines and over 2,800 raw material specifications means the base steel for every galvanized square and rectangular steel tube is produced, tested, and certified in-house — no third-party coil sourcing that breaks the material traceability chain. The in-house laboratory performs coating thickness measurement, adhesion testing, and dimensional inspection on every production batch, with results documented in EN 10204/3.1B mill test certificates referencing heat numbers. CE certification under EN 10210/EN 10219, ISO 9001 quality management, and accepted SGS/BV third-party inspection protocols satisfy the compliance requirements of EU, Middle Eastern, and African project owners. Custom length cutting to 2000–12000 mm reduces on-site waste, while plain, beveled, or threaded end finishing matches project connection details. Professional container loading plans — developed from years of handling oversized hollow section shipments to Latin America, Southeast Asia, and Africa — protect the galvanized coating during ocean transit through proper timber separation and edge protection.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345/S235JR/S275JR chemical composition and mechanical properties per EN 10204/3.1B, with heat number traceability
- CE certificate confirming compliance with EN 10210 (hot-finished) or EN 10219 (cold-formed) hollow section standards for EU market access
- ISO 9001 quality management system certificate covering the full production process from raw steel to galvanized finished tube
- SGS or BV third-party inspection report available upon client request, covering dimensional tolerance, coating thickness, and surface quality
- Material traceability report linking each bundle to its heat number, galvanizing batch, and coating weight measurement
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Hot-dipped galvanized square and rectangular steel tube bundled with steel strips and separated by timber spacers to prevent zinc coating abrasion during ocean transit
- Electroplated and pre-painted galvanized sections wrapped with waterproof cloth and edge protectors to preserve surface finish and prevent white rust formation
- Container loading plans optimized for 20ft and 40ft open-top or flat-rack containers based on tube length (up to 12000 mm) and section dimensions, maximizing payload while maintaining coating integrity
- Custom length cutting available within the 2000–12000 mm range to match project-specific member lengths, reducing on-site cutting waste and galvanized edge exposure
- Each bundle marked with heat number, steel grade (Q235/Q345/S235JR etc.), section size, wall thickness, and coating weight class for site identification
- Delivery terms FOB, CIF, and DDP available with professional export packing and full tracking through to destination port or project site
Initiating Your Galvanized Square and Rectangular Steel Tube Inquiry
Submit your project drawings (PDF/DWG), steel grade requirements, section dimensions, coating specification, and destination port to receive a detailed quotation including material, fabrication, coating, packing, and shipping costs within 24 hours. Our engineering team will review shop drawings, confirm standard compliance (EN/ASTM/JIS), and provide a production schedule with mill test certificate documentation before contract signing.
Request Your Galvanized Square and Rectangular Steel Tube Quotation
Share your specifications, steel grades, and quantity to receive pricing with EN 10204/3.1B mill test certificates and a detailed production timeline.
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: What is the difference between hot-dipped, pre-galvanized, and electroplated galvanized tubes — which suits my project environment?
A: Hot-dipped galvanized tubes (zinc 120–500 g/m²) provide the highest corrosion resistance through metallurgical zinc-iron bonding, suitable for outdoor, coastal, or industrial environments. Pre-painted galvanized tubes (zinc 60–120 g/m²) combine moderate corrosion protection with an organic coating for aesthetic or chemical resistance needs. Electroplated galvanized tubes (zinc 10–50 g/m²) offer a thin, uniform coating best suited for indoor or dry environments where appearance and dimensional accuracy are priorities.
Q: Can you provide mill test certificates and accept third-party inspection before shipment?
A: Yes. Every galvanized square and rectangular steel tube order is accompanied by an EN 10204/3.1B mill test certificate documenting chemical composition, mechanical properties, and coating weight, with full heat number traceability. Third-party inspection by SGS or BV is available upon client request, covering dimensional checks, coating thickness measurement, and surface quality verification before container loading.
Q: What standards do your galvanized hollow sections comply with?
A: Our galvanized square and rectangular steel tube production complies with GB/T 3091, BS1387, EN39, EN1139, ASTM A53, and JIS G3444, covering European, British, American, Japanese, and Chinese project requirements. Steel grades include Q235, Q345, S235JR, S275JR, STK400, STK500, SGCC, CGCC, and DX51D to match the structural design code specified by your engineer.
Q: What is the MOQ for custom sizes and lengths, and what is the typical production lead time?
A: The minimum order quantity is 5 tons. Custom lengths within the 2000–12000 mm range are available, and typical production lead times depend on order volume, coating specification, and current mill schedule — confirmed upon receipt of your inquiry with full specifications.
Q: How do you handle packing and loading for galvanized tubes to prevent coating damage during transit?
A: Hot-dipped galvanized bundles are separated with timber spacers and secured with steel strips to prevent metal-to-metal contact and zinc abrasion during ocean transit. Electroplated and pre-painted sections receive additional waterproof wrapping and edge protection. Container loading plans are developed based on tube dimensions and length to maximize payload while maintaining coating integrity, drawing on extensive experience shipping galvanized hollow sections to Latin America, Southeast Asia, the Middle East, and Africa.
