Description
Certified EN 10219 Hollow Sections — S355JR and S275J0 grades with full mill test certificates and CE marking for European structural projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Galvanized Square Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | A53 Grade B / A500 Grade A / Grade B / Grade C / STK400 / SS400 / ST42.2 / S355JR |
| Standard | ASTM A53 / A500 / A36 / A795; BS1387; EN10255; ISO65; ANSI C80; DIN2440; JIS G3444; GB/T3091; GB/T13793 |
| Section Shape | Square / Rectangular |
| Size Range | 21.3mm–660mm (1/2″–26″) |
| Wall Thickness | 6mm (customizable) |
| Length | 5.8m / 6m / 11m / 12m (or as customer needs) |
| Technique | Hot-dip Galvanized |
| Surface Treatment | Galvanized (Hot-dip / Pre-galvanized) |
| Tolerance | ±1% / ±5% |
| Ends | Plain / Beveled / Threaded / Grooved |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Fluid transportation (water & gas) / Municipal infrastructure |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Municipal Infrastructure | Water transmission pipelines, gas distribution networks, drainage systems |
| Commercial Construction | Building frames, column supports, mezzanine structures |
| Industrial Facilities | Machinery frames, conveyor supports, platform structures |
| Scaffolding Systems | Load-bearing vertical standards, horizontal ledgers, diagonal braces |
Where Coating Thickness Decides Project Acceptance
Galvanized layer uniformity directly determines whether your shipment passes port inspection or gets rejected at site.
I’ve seen too many projects stall because buyers trusted supplier claims without verification. A Middle East municipal water project once received rectangular tubes specified at 65μm coating, only to find 38μm at port inspection — the entire batch failed acceptance, and air-freighting replacements wiped out the margin. Hot-dip galvanizing for structural hollow sections requires consistent zinc adhesion across all surfaces, including internal corners of square sections. [NEED_CITE: hot-dip galvanized coating thickness requirements for structural steel]
When sourcing a Galvanized Square Steel Tube supplier, the gap between promised and delivered coating thickness often traces back to fragmented procurement — where the fabricator sources black tubes from one mill and galvanizing from another, with no single point of accountability for the final product.
Matching Municipal Pipeline Requirements
Hot-dip galvanized SHS and RHS sections meet the corrosion resistance demands of buried water and gas transmission systems. The zinc coating provides sacrificial protection at cut edges and weld points, while the steel core maintains structural integrity under soil loading. For municipal projects specifying EN 10219 or ASTM A500 compliance, our vertically integrated production ensures material traceability from steelmaking through final galvanizing — one heat number, one quality system, one certificate package.
Structural Compliance and Certification Path
Load-bearing frames for commercial buildings and industrial facilities require documented compliance with EN 10219 cold-formed hollow section requirements or ASTM A500 specifications. [NEED_CITE: EN 10219 cold-formed hollow section requirements] The steel grade selection — whether S355JR for higher yield strength or A500 Grade B for North American projects — determines both structural capacity and customs clearance documentation. CE marking under EN 10210/EN 10219 is mandatory for structural components entering EU markets, while ASTM certifications govern North American procurement.
Understanding Steel Grade Selection
The S-series (S235, S275, S355JR) follows European EN standards with yield strength designations, while ASTM A500 Grades A/B/C and A53 Grade B represent the North American system. Japanese STK400 and SS400 grades serve Pacific Rim projects. Hot-dip galvanizing adds corrosion protection without altering the base steel’s mechanical properties, though the process temperature and immersion time affect coating thickness uniformity. Wall thickness tolerance of ±1% to ±5% impacts both theoretical weight calculations and actual load-bearing capacity — negative tolerance beyond specification reduces structural safety margins while inflating per-ton pricing.
Hidden Costs of Unverified Procurement
Material substitution without documentation creates cascading failures: customs holds due to missing CE certificates, site rejections from coating thickness below specification, structural recalculations when actual yield strength differs from mill certificates. [NEED_CITE: steel grade equivalence between EN and ASTM standards] A Galvanized Square Steel Tube supplier without integrated production cannot guarantee traceability between the black tube origin and the final galvanized product, leaving buyers exposed to certification gaps that delay project handover.
Why Integrated Production Matters
Our steel mill produces the raw material across 2,800+ specifications, then fabricates and galvanizes in-house — eliminating the certification chain breaks that occur when black tubes, fabrication, and coating come from separate vendors. Every Galvanized Square Steel Tube ships with complete documentation: WPS/PQR for welded connections, dimensional inspection reports, coating thickness measurements, and material traceability by heat number. Third-party inspection through SGS or BV verifies quantity and quality before shipment, while our professional loading team handles oversized components and custom packing for ocean transit.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN 10219, with heat number traceability
- CE certificate confirming EN 10210/EN 10219 compliance for structural hollow sections entering European markets
- ISO 9001 quality management certificate covering the integrated steelmaking-to-galvanizing process
- SGS or BV third-party inspection report verifying coating thickness, dimensional accuracy, and surface quality
- Material traceability documentation linking each tube to its original heat number and production batch
- Complete customs package including packing list, bill of lading, and certificate of origin for destination clearance
Packaging, Loading & Delivery
- Hot-dip galvanized tubes bundled with steel strips and edge protectors to preserve zinc coating during ocean transit
- Surface protection maintained through proper stacking separation, preventing coating damage from tube-to-tube contact
- Container loading optimized for 6m and 12m lengths, maximizing payload while protecting galvanized surfaces
- Custom cutting to project-specific lengths available, reducing on-site waste and handling
- Heat number and steel grade markings clearly stenciled on each bundle for site identification
- FOB, CIF, and DDP shipping terms available with door-to-door logistics for project sites
Requesting Your Project Quote
Submit your project drawings, steel grade requirements, coating specifications, and destination port to receive a detailed quotation including material costs, galvanizing treatment, packing, and shipping. Our engineering team reviews shop drawings within 24 hours, confirming dimensional compliance and suggesting material optimizations for your Galvanized Square Steel Tube requirements.
Frequently Asked Questions
Q: What is the difference between hot-dip galvanized and pre-galvanized square tubes?
A: Hot-dip galvanizing immerses the finished tube in molten zinc, creating a metallurgical bond with thicker coating (typically 45-85μm) suitable for outdoor and buried applications. Pre-galvanized tubes are made from already-coated steel coil, offering thinner protection (15-25μm) for indoor or non-corrosive environments.
Q: Can you provide material certificates for European project compliance?
A: Yes, all Galvanized Square Steel Tube products ship with EN 10219 or EN 10210 compliance documentation, CE marking certificates, and mill test certificates showing chemical composition and mechanical properties per your specified steel grade.
Q: What is the minimum order quantity for custom dimensions?
A: Our MOQ is 1 Ton, with customizable wall thickness, lengths up to 12m, and end processing including plain, beveled, threaded, or grooved options to match your project specifications.
Q: Do you offer third-party inspection before shipment?
A: We welcome SGS, BV, or other independent inspection agencies to verify coating thickness, dimensional accuracy, and surface quality at our facility before container loading.
Q: How do you ensure coating thickness consistency across the order?
A: Each tube undergoes membrane thickness gauge measurement before leaving the galvanizing line, with results documented in the quality certificate package. Our integrated production allows full traceability from steel grade to final coating.
Get Your Galvanized Square Steel Tube Quote Today
Send your project specifications, steel grade requirements, and destination details to receive pricing with complete mill test certificates and compliance documentation.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Website: www.xjystructure.com
