Description
Factory-Direct Pricing, No Middlemen — As a manufacturer with 3 dedicated production lines and in-house physical and chemical laboratories, we cut out trading margins on every Hot Dip Galvanized Square Steel Tube EN 10219 Supplier order.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Hot Dip Galvanized Square Tube EN 10219 |
| Product Type | Galvanized Square Steel Tube |
| Steel Grade | Q195, Q235, Q345, SS400, S355JR, A53 Grade B, A500 Grade A/B/C, STK400, ST42.2 |
| Standard | EN 10219, EN 10210, ASTM A53, ASTM A500, ASTM A36, ASTM A795, BS 1387, ISO 65, ANSI C80, DIN 2440, JIS G3444, JIS G3466, GB/T 3091, GB/T 13793 |
| Section Shape | Square (also available in Round, Rectangular) |
| Size Range | 21.3mm–660mm (1/2″–26″) |
| Wall Thickness | Up to 40mm |
| Length | 5.8m / 6m / 11m or customized |
| Technique | ERW / Welded |
| Surface Treatment | Hot Dip Galvanized (Zinc Coated 40–600g/m²) |
| Tolerance | ±1% |
| Pipe Ends | Plain ends, Beveled ends, Threaded ends, Grooved ends |
| Processing Service | Decoiling, Bending, Cutting, Punching, Welding |
| Invoicing | By Theoretical Weight |
| Packing | Plastic caps on both ends + woven bag wrap + tied in bundle; standard sea-worthy packing or customer-required |
| Application | Steel structures, Agricultural greenhouses, Construction frames, Fluid/gas/water transportation, Machinery, Scaffolding, Power & boiler, Petrochemical, Building industry |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Steel structure frames for industrial plants, solar farm mounting structures, conveyor support systems |
| Construction Companies | High-rise building frames, bridge handrails, scaffolding systems, architectural facades |
| Agricultural Sector | Greenhouse skeletons, irrigation pipeline supports, livestock shelter frames |
| Machinery Manufacturers | Equipment base frames, hydraulic cylinder housings, material handling structures |
| Petrochemical & Power | Pipeline supports, boiler structural members, petrochemical rack frames |
Where EN 10219 Certification Decides Customs Clearance and Site Acceptance
Missing or incomplete EN 10219 documentation is the single most common reason galvanized square tubes get held at EU ports or rejected during structural inspection.
I have seen entire container loads of Hot Dip Galvanized Square Steel Tube EN 10219 Supplier products sit in Rotterdam for weeks because the mill test certificate did not reference the correct steel grade designation or lacked the CE marking required under EN 10210/EN 10219. The tubes themselves were perfectly fine — the zinc coating was uniform, the dimensions were within tolerance — but the paperwork gap turned a routine delivery into a costly delay. [NEED_CITE: EN 10219 cold-formed hollow section technical delivery requirements] For EPC contractors working on EU-funded infrastructure or Middle East mega-projects, this is not a minor inconvenience; it triggers liquidated damages clauses and cascading schedule impacts.
The same problem shows up in reverse when buyers in Southeast Asia or South America receive tubes stamped to ASTM A500 but the local engineer specifies EN 10219. The steel may be mechanically equivalent, but without the correct certification cross-reference, the material cannot be approved for load-bearing use. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards]
How Hot Dip Galvanizing Matches Corrosive Environments in Greenhouse and Solar Structures
Agricultural greenhouses and solar farm mounting structures expose steel to constant humidity, fertilizer vapors, and coastal salt spray — conditions that will strip paint systems within months. Hot dip galvanizing at 40–600g/m² zinc coating creates a metallurgical bond between the zinc and the base steel, providing sacrificial cathodic protection that outlasts any organic coating. For a Hot Dip Galvanized Square Steel Tube EN 10219 Supplier order destined for a greenhouse project in Indonesia or a solar array in the Middle East, specifying the correct zinc thickness class is the difference between a 15-year service life and a replacement cycle that begins in year five. Our in-house laboratory verifies coating weight per shipment using magnetic thickness gauges and chemical dissolution methods, so you receive documented proof — not just a supplier’s word.
Structural Compliance: Load-Bearing Requirements and Certification Pathways
EN 10219 governs cold-formed welded structural hollow sections, and its technical delivery conditions cover dimensional tolerances, mechanical properties, and chemical composition for grades like S355JR and S235JR. [NEED_CITE: EN 10219 dimensional and mechanical tolerance requirements] For projects designed under Eurocode 3 (EN 1993), the Hot Dip Galvanized Square Steel Tube EN 10219 Supplier must provide mill test certificates conforming to EN 10204 Type 3.1 or 3.2, with traceability back to the heat number. In North America, ASTM A500 Grade B/C or A53 Grade B governs the same product category, and our production lines hold CE certification under EN 10210/EN 10219 for EU markets while simultaneously meeting ASTM and JIS requirements for global export. Custom cut-to-length services — bending, punching, grooving — reduce on-site secondary processing, which matters when labor costs at remote project sites run two to three times the material price.
Steel Grade Selection and ERW Welding Process: What the Specification Sheet Does Not Tell You
The Hot Dip Galvanized Square Steel Tube EN 10219 Supplier product line spans non-alloy structural grades (Q195, Q235, S235JR, SS400) through higher-strength options (Q345, S355JR, A500 Grade B/C) and Japanese standard grades (STK400, ST42.2). The jump from S235 to S355 represents roughly a 50% increase in minimum yield strength — significant when structural engineers are optimizing member sizes to reduce dead load on long-span greenhouse frames or elevated conveyor systems. ERW (Electric Resistance Welding) is the dominant forming process for square and rectangular hollow sections in this size range (21.3mm–660mm), offering tighter dimensional control and lower cost compared to seamless alternatives, while remaining fully compatible with hot dip galvanizing because the weld seam is normalized during the galvanizing bath thermal cycle. [NEED_CITE: ERW weld seam behavior during hot dip galvanizing process] Wall thickness up to 40mm covers heavy structural applications, and our proprietary sharp-corner rectangular tube technology — one of 41 patented processes — delivers internal corner radii that match standard square tube connection hardware, eliminating the gap-filling shims that welded built-up sections require.
The Hidden Cost of Buying the Wrong Zinc Class or Unverified Steel Grade
Ordering pre-galvanized tubes when the specification calls for hot dip galvanized is a common procurement error that surfaces only after the material reaches the job site. Pre-galvanized coatings typically run 20–40g/m² — adequate for indoor electrical conduit, but insufficient for outdoor structural exposure where hot dip at 275–600g/m² is the engineering minimum. The cost difference at the purchase order stage is marginal; the cost difference when the structure shows rust staining at year two is the full replacement of affected members, plus crane time, plus project delay penalties. Similarly, accepting a mill test certificate that lists “equivalent grade” rather than the specific designation called out in the contract documents (e.g., S355JR per EN 10219 rather than a generic “high-strength structural steel”) creates liability exposure for the EPC contractor. [NEED_CITE: structural steel grade traceability requirements under EN 10204]
Why Global EPC Contractors and Steel Distributors Source Hot Dip Galvanized Square Steel Tube EN 10219 Supplier Products From Us
We operate three dedicated production lines covering over 2,800 specifications in square, rectangular, and round profiles — meaning a single purchase order for a solar farm project can include 50×50×3mm greenhouse purlins, 100×100×5mm main support columns, and 200×100×8mm racking beams, all shipped in one consolidated container with unified certification. Our in-house physical and chemical laboratory performs incoming raw material inspection, in-process weld seam verification, and final dimensional and coating weight checks before any Hot Dip Galvanized Square Steel Tube EN 10219 Supplier shipment leaves the facility. The 41 invention patents include our proprietary sharp-corner rectangular tube forming process, which fills a gap in the global market for tubes that mate directly with standard square-tube connection fittings without additional machining. We hold CE certification under EN 10210/EN 10219, ISO 9001:2015, Singapore FPC, and accept SGS or BV third-party inspection at the buyer’s request — documentation that has cleared customs in over 50 countries across the EU, North America, Middle East, India, and Southeast Asia. Every order includes professional loading plans optimized for container weight distribution, because I learned early that a 40-foot柜 loaded without proper separation and bracing will arrive with galvanized surfaces scraped bare — and no amount of paperwork fixes physical damage.
Documentation & Compliance
- Mill Test Certificate documenting S355JR chemical composition and yield strength per EN 10219, with heat number traceability
- CE Certificate confirming compliance with EN 10210/EN 10219 for structural hollow sections destined for EU markets
- ISO 9001:2015 Quality Management System certificate covering the full production and inspection process
- SGS or BV Third-Party Inspection Report verifying zinc coating weight (40–600g/m²) and dimensional tolerance before loading
- Material Traceability Report linking each bundle to its heat number, chemical composition, and mechanical test results
- Customs Document Package including packing list, Bill of Lading, and Certificate of Origin for import clearance in destination country
Packaging, Loading & Delivery
- Hot Dip Galvanized Square Steel Tube EN 10219 Supplier products bundled with steel strips and wrapped in woven bags, with plastic end caps to protect tube interiors during ocean transit
- Zinc coating preserved through edge protectors and separation materials between bundles, preventing contact abrasion that would expose bare steel
- Container loading optimized for 5.8m, 6m, and 11m lengths in 20-foot and 40-foot containers, with weight distribution plans that maximize payload while maintaining axle limits at destination port
- Custom cut-to-length service available for orders requiring non-standard lengths, with cut ends deburred and re-galvanized to maintain corrosion protection continuity
- Heat number and steel grade stenciled on each bundle tag, matching the mill test certificate for on-site verification by QA inspectors
- FOB, CIF, and DDP logistics options with door-to-door delivery to project sites in 50+ countries, coordinated by our international trade team with nearly 20 years of export handling experience
How to Initiate Your Procurement Inquiry
Submit your specification sheet — including square tube dimensions, wall thickness, steel grade (S355JR, A500 Grade B, or other), zinc coating class, total tonnage, and destination port — and we respond within 12 hours with a detailed quotation, production lead time, and applicable certification package. For non-standard sizes or custom processing (cutting, bending, punching), our engineering team provides a feasibility assessment and fabrication drawing confirmation before production begins.
Request Your Quotation and Mill Test Certificate Today
Send your Hot Dip Galvanized Square Steel Tube EN 10219 Supplier specifications via email or WhatsApp, and receive a formal quotation with full documentation package within 12 hours.
Contact:
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Website: www.sdxjysteel.com
Frequently Asked Questions
Q: What is the difference between hot dip galvanized and pre-galvanized square tubes, and which does EN 10219 require?
A: Hot dip galvanizing immerses the finished tube in molten zinc at approximately 450°C, creating a metallurgical bond with coating weights from 40g/m² up to 600g/m². Pre-galvanizing applies zinc to the steel strip before tube forming, typically resulting in 20–40g/m² coating. EN 10219 does not mandate a specific galvanizing method, but structural applications in corrosive environments generally specify hot dip at 275g/m² minimum for long-term corrosion protection. Our production covers the full range, and we advise on the appropriate zinc class based on your project’s environmental exposure category.
Q: Can you supply Hot Dip Galvanized Square Steel Tube EN 10219 Supplier products with CE certification for EU projects?
A: Yes. Our factory holds CE certification under EN 10210 and EN 10219 for cold-formed welded structural hollow sections, and every shipment to EU markets includes the Declaration of Performance, CE marking on the product, and mill test certificates conforming to EN 10204 Type 3.1. We have exported to EU member states for years and understand the documentation requirements for customs clearance and structural engineer approval.
Q: What is the MOQ for custom non-standard sizes or special steel grades?
A: Our standard MOQ is 1 Ton for catalog sizes in Q195, Q235, Q345, S355JR, A500 Grade B/C, and other listed grades. For custom non-standard dimensions or special steel grades outside our regular production schedule, MOQ depends on the specific requirement — typically 5 to 10 tons for non-standard wall thickness or unusual side lengths. Contact us with your specification for a precise answer.
Q: How do you ensure zinc coating uniformity on square tubes with sharp internal corners?
A: Our hot dip galvanizing process includes controlled immersion speed, bath temperature monitoring, and nitrogen wiping for internal corners to prevent zinc buildup or bare spots. The proprietary sharp-corner rectangular tube technology we developed ensures that internal corner radii are consistent, allowing zinc to flow evenly during galvanizing. Every shipment includes coating weight test results verified by our in-house laboratory, and third-party inspection by SGS or BV is available upon request.
Q: Can you provide steel grade cross-reference documentation if my project specifies ASTM A500 but the local engineer requires EN 10219 compliance?
A: Yes. We provide grade equivalence documentation mapping ASTM A500 Grade B/C to EN 10219 S235JR/S355JR, along with chemical composition and mechanical property comparisons. While exact equivalence depends on the specific heat analysis, our technical team prepares cross-reference reports that satisfy both the original specification and the local approval authority. This documentation is included in the shipment package at no additional cost.
