Description
Factory-Direct Pricing, Zero Middlemen — Every Pre Galvanized Welded Rectangular Steel Tube ships from our Jinan mill at bulk volume rates, with original mill test certificates attached to each heat number.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Pre Galvanized Welded Rectangular Steel Tube |
| Product Type | Welded Rectangular Steel Tube / RHS |
| Steel Grade | Gr.B, S235, S275, S355, STK400, Q195–Q690 |
| Standard | ASTM A500, ASTM A53, GB/T 3091 |
| Section Shape | Rectangular |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1–30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Pre-Galvanized / Black Painting / Varnish / Bare |
| Tolerance | ±10% |
| Ends | Plain End |
| Processing Service | Bending, Cutting, Welding |
| Application | Steel structures / Construction frames / Curtain wall / Support tubes / Building structures / Machinery frames |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames for commercial buildings, curtain wall support systems, building columns and bracing members |
| Industrial & Machinery | Equipment base frames, conveyor support structures, machinery guarding frameworks |
| Commercial Buildings | Scaffolding systems, perimeter fencing, furniture structural frameworks |
| Steel Fabrication | Portal frame components, mezzanine floor supports, roof purlin systems |
What Certification Gaps Cost You at Customs and on Site
Missing mill certificates or non-compliant surface treatment documentation can halt an entire container at the port — or fail a structural inspection months after installation.
When buyers source Pre Galvanized Welded Rectangular Steel Tube from fragmented suppliers, the zinc coating thickness often arrives without verifiable test data. Customs authorities in the EU and Middle East increasingly demand CE marking per EN 10210/10219 alongside original mill test certificates — and shipments without them get held, tested at the buyer’s cost, or rejected outright. [NEED_CITE: CE marking requirements for structural hollow sections under EN 10210] Beyond customs, project engineers need traceable heat numbers to verify that S355 grade steel actually meets the yield strength specified in the structural drawings. A single batch of non-conforming material can force demolition and re-fabrication of an entire frame section.
How Pre-Galvanized RHS Matches Structural and Corrosion Requirements
Pre-galvanized ERW rectangular tubes deliver a zinc coating applied before fabrication, providing uniform corrosion protection across the full surface — including the weld seam — making them suitable for indoor structural frames, curtain wall supports, and machinery bases where moderate atmospheric exposure is expected. The Pre Galvanized Welded Rectangular Steel Tube in S235 and S355 grades covers the majority of load-bearing applications in commercial construction, while Gr.B and STK400 serve lighter structural and non-critical framing needs. Our 15×20mm to 700×800mm size range with wall thickness up to 30mm means a single sourcing partner can supply everything from small furniture frameworks to heavy portal frame columns — eliminating the coordination overhead of splitting orders across multiple mills.
Engineering Compliance: Load, Corrosion, and Certification Alignment
Structural engineers designing to EN 1993 or AISC specifications require hollow sections that conform to recognized manufacturing standards — our Pre Galvanized Welded Rectangular Steel Tube meets ASTM A500 for North American projects and EN 10219 for European market compliance, with CE certification ensuring legal placement in EU member states. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections requirements] The pre-galvanized surface treatment provides corrosion resistance appropriate for interior environments and sheltered exterior applications; for aggressive industrial or coastal atmospheres, buyers should evaluate whether hot-dip galvanizing after fabrication offers superior long-term protection. Steel grade selection directly affects load capacity — S355 delivers higher yield strength than S235, allowing thinner wall sections for equivalent structural performance, which reduces both material weight and shipping cost per meter. [NEED_CITE: steel grade equivalence between ASTM A500 and EN 10219 standards] Fixed lengths of 5.8m, 6m, 11.8m, and 12m minimize on-site cutting waste, while our in-house bending, cutting, and welding services allow delivery of fabrication-ready components.
Steel Grade Selection and ERW Welding Process Explained
The S-series grades (S235, S275, S355) follow the European EN standard system where the number indicates minimum yield strength in MPa — S355 provides substantially higher load-bearing capacity than S235, making it the default choice for primary structural members in commercial and industrial buildings. Gr.B aligns with ASTM A500 Grade B for the North American market, while STK400 serves JIS G3466 specifications common in Asian projects. Our Q195–Q690 range covers the full Chinese GB standard spectrum, allowing direct material substitution when project specifications reference multiple standard systems. The ERW (Electric Resistance Welded) process forms the rectangular profile from steel coil and welds the seam through electrical resistance heating — this method delivers tight dimensional tolerance (±10%), consistent wall thickness, and cost efficiency for high-volume structural applications. Pre-galvanizing applies the zinc coating to the formed and welded tube, ensuring the coating covers the entire exterior surface including the weld zone, providing corrosion protection without the distortion risks associated with hot-dip galvanizing thin-walled sections.
The Hidden Costs of Procuring Without Verified Material Traceability
Ordering Pre Galvanized Welded Rectangular Steel Tube based on price alone — without verified mill test certificates, independent third-party inspection, or confirmed steel grade equivalence — exposes projects to material substitution risk, where delivered steel falls below the specified grade. [NEED_CITE: consequences of non-conforming structural steel in construction projects] The consequences compound: customs rejection at destination port, failed structural load testing, mandatory removal and replacement of installed members, and project timeline delays that trigger liquidated damages clauses. Zinc coating thickness below specification accelerates corrosion, compromising both structural integrity and aesthetic appearance — problems that may not surface until years after installation, long after the supplier has disappeared.
Why Engineering Buyers Source Pre Galvanized RHS From Xin Jiyuan
Our Jinan factory operates three simultaneous production lines with monthly capacity exceeding 20,000 tons, delivering factory-direct pricing without trading company markups — volume discount programs reward long-term procurement partnerships. Every heat of Pre Galvanized Welded Rectangular Steel Tube ships with original mill test certificates documenting chemical composition and mechanical properties, and we arrange SGS or BV third-party inspection on request for buyers who require independent verification. Our inventory covers 2,800+ specifications across square tubes, rectangular tubes, round pipes, plates, and section steel — enabling consolidated container loading that reduces per-unit freight cost and simplifies project procurement. We hold ISO 9001:2015 certification and CE marking per EN 10210/10219, ensuring compliance for European market entry, while our professional export team handles documentation, customs clearance coordination, and container loading optimization to maximize payload within shipping weight limits. Flexible MOQ starting from 1 ton accommodates both trial orders and full-container bulk procurement, with typical production lead times of 15–25 days for custom specifications outside our ready-stock range.
Documentation & Compliance
- Mill test certificate documenting S235/S355/Gr.B chemical composition and mechanical properties per ASTM A500 or EN 10219 for each production heat
- CE certificate confirming compliance with EN 10210 (hot-finished) and EN 10219 (cold-formed) structural hollow section requirements for European market placement
- ISO 9001:2015 quality management system certificate covering the full production process from raw material incoming inspection to finished product testing
- SGS or BV third-party inspection report available upon request, verifying dimensional accuracy, zinc coating thickness, and surface quality before shipment
- Full material traceability by heat number linking each bundle to its corresponding mill test certificate and production batch record
- Complete customs documentation package including packing list, bill of lading, and certificate of origin formatted to destination country requirements
Packaging, Loading & Delivery
- Pre-galvanized rectangular tubes bundled with steel strips and edge protectors to preserve the zinc coating surface during handling and ocean transit
- Seaworthy packaging with waterproof wrapping available for pre-galvanized and black painted finishes to prevent moisture damage during container shipping
- Container loading optimization for 15×20mm through 700×800mm sections across 5.8m, 6m, 11.8m, and 12m lengths to maximize payload within 20ft and 40ft container weight limits
- Heat number and steel grade markings stenciled on each bundle for on-site identification and traceability verification during installation
- FOB, CIF, and DDP shipping terms available with professional export documentation handling and real-time shipment tracking
- In-house cutting and bending services allow delivery of fabrication-ready lengths, reducing on-site waste and labor cost at the project location
Ready to Verify Material Compliance and Lock Factory-Direct Pricing
Submit your specification sheet — including rectangular dimensions, wall thickness, steel grade (S235/S355/Gr.B/STK400), total quantity, surface treatment preference, and destination port — and receive a detailed quotation with volume pricing, mill test certificate confirmation, and production lead time within 12 hours. We will confirm available stock for standard sizes or provide a custom production schedule for non-standard dimensions, along with documentation required for your destination market’s customs clearance.
Request Your Quotation and Mill Test Certificate Today
Send your Pre Galvanized Welded Rectangular Steel Tube requirements via email or WhatsApp to receive factory-direct pricing, material certification details, and container loading optimization for your next project shipment.
Contact: admin@sdxinjiyuan.com | WhatsApp: +86 188 5315 7756 | Tel: +86 531 8573 6315
