Description
Full-Range Rectangular ERW Tubes — From 10×30mm to 600×800mm in SS400, Q235, and S355JR, all produced and fabricated under one roof at our own mill in Jinan.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Rectangular ERW Welded Steel Pipe (JIS Standard) |
| Product Type | Rectangular Steel Tube (Hollow Section) |
| Steel Grade | SS330, SS400, SS490, SPCC, SPCD, SPCE, Q195, Q235, Q345, S235JR, S355JR, ST37, ST42, ST52, SPHC, DC01, QSTE, SAPH |
| Standard | JIS G3466, JIS G3468 |
| Section Shape | Rectangular |
| Size Range | 10mm×30mm – 600mm×800mm |
| Wall Thickness | 0.5mm – 20mm |
| Length | 1m – 16m (or customized) |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Bared / Black Painted (varnish coating) / Galvanized / Oiled / Shop Primer and Shot Blasting |
| Tolerance | ±1% |
| Ends | Plain / Beveled (as required) |
| Application | Steel structures / Construction frames / Agricultural machinery / Construction machinery / Electric bicycle frames / Industrial platforms / Scaffolding / Furniture |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, column-beam connections, industrial platforms, scaffolding systems |
| Agricultural Machinery | Chassis frames, implement mounts, loader arms for harvesters and tractors |
| Construction Machinery | Crane boom sections, excavator sub-frames, conveyor support structures |
| Light Structural & Furniture | Display racks, mezzanine flooring, electric bicycle frames, warehouse shelving |
Where Dimensional Tolerance Decides Whether Your Frame Goes Together on Site
A ±1% tolerance on rectangular sections is the difference between bolts sliding into pre-drilled holes and a full day of reaming on a crane platform.
I learned this the hard way on a commercial complex project in Riyadh. The EMT thin-wall tubes we sent were cut to nominal length, but the workshop didn’t account for JIS springback allowance during bending. Port ovality exceeded the clamp connection spec — an entire container was rejected at site inspection. Since then, every first piece off the line gets checked for end ovality and length tolerance before the batch runs. When you source a JIS Standard Rectangular ERW Welded Steel Tube Supplier from a single mill-to-fabrication source, that check happens at the same facility that rolls the coil, eliminating the traceability gap between material cert and finished dimension. [NEED_CITE: JIS G3466 dimensional tolerance requirements for structural hollow sections]
Matching Rectangular Sections to Structural Load Paths and Connection Details
Rectangular hollow sections carry bending loads efficiently on both axes, making them the default choice for portal frames, mezzanine beams, and machinery skids where torsional rigidity matters. Our JIS Standard Rectangular ERW Welded Steel Tube range covers wall thicknesses from 0.5mm for light gauge furniture frames up to 20mm for heavy structural columns, all available in SS400, Q235, or S355JR from the same production line. The ERW weld seam runs along the flat face rather than the corner, which keeps the corner radius tight for flush gusset plate connections — something seamless or SSAW tubes cannot offer at this size range.
Structural Code Compliance and Surface Protection for Field Conditions
Load-bearing frames in commercial construction typically require compliance with EN 1993 or AISC 360, and the steel grade must be backed by traceable mill certificates tied to heat numbers. For outdoor or high-humidity environments, shop primer plus shot blasting provides a baseline corrosion allowance, while hot-dip galvanizing extends service life without ongoing maintenance. If the project spec calls for JIS G3466, our SS400 and SS490 grades meet that standard directly; for European projects, S235JR and S355JR are produced to EN 10219 equivalent chemistry. Third-party inspection by SGS or BV is available before shipment to satisfy consultant requirements on EPC contracts. [NEED_CITE: EN 10219 cold-formed structural hollow section certification requirements]
Understanding ERW Weld Quality and Grade Selection for Rectangular Tubes
The ERW process forms the tube by rolling flat strip into a rectangular profile and fusing the seam through electrical resistance — no filler metal, which keeps the weld zone narrow and the corner geometry sharp. SS400 and Q235 are general structural grades with similar yield levels, suitable for frames, platforms, and machinery supports. S355JR offers higher yield strength for long-span beams or heavily loaded columns where section size is constrained. SPCC and SPCE are low-carbon drawing grades used when the tube will undergo secondary forming like flattening or notching at the fabrication shop. Wall thickness tolerance of ±1% means the actual weight stays close to theoretical calculations, which matters when shipping cost is invoiced per metric ton. [NEED_CITE: ERW weld seam quality comparison with seamless and SSAW for structural applications]
The Hidden Cost of Sourcing Rectangular Tubes Without Verified Mill Documentation
Buying rectangular tubes from a trader who sources from multiple mills means the mill test certificate may not match the heat number stamped on the tube. When the consultant requests a 3.2 inspection certificate under EN 10204, the trader cannot produce it — and the shipment sits at the port. Worse, if the actual chemistry falls outside the JIS G3466 range for SS400, the structural engineer cannot sign off on the frame, triggering re-fabrication at double the original cost. A JIS Standard Rectangular ERW Welded Steel Tube Supplier who owns the mill controls the full chain from slab to finished tube, with every heat number traceable from the rolling log to the shipping document. [NEED_CITE: EN 10204 inspection certificate types 3.1 vs 3.2 for structural steel]
Why Procurement Teams Choose Our Mill for Rectangular ERW Tubes
We operate our own steel production facility with three rolling lines and over 2,800 specifications in stock, which means your SS400 rectangular tubes in 100×200×6mm don’t get sourced from a third-party mill and then resold to you. Our fabrication division handles CNC cutting, bending, punching, and welding to shop drawings — so you receive finished components, not raw lengths that need secondary processing at your yard. Every order ships with a complete documentation package: WPS, PQR, weld maps, dimensional inspection reports, and coating thickness measurements. We have supplied structural steel to EPC firms and general contractors across the Middle East, Southeast Asia, and Africa, where port inspection and consultant sign-off are routine. Our in-house quality lab issues mill test certificates per EN 10204 3.1, and third-party inspection by SGS, BV, or TÜV can be arranged before loading.
Documentation & Compliance
- Mill test certificate documenting SS400 and Q235 chemical composition and mechanical properties per JIS G3466, with heat number traceability from coil to finished tube
- Third-party inspection report from SGS, BV, or TÜV covering dimensional checks, weld seam ultrasonic testing, and coating thickness measurement before shipment
- ISO 9001 certified quality management system covering the full production chain from raw steel coil to fabricated and coated rectangular tubes
- Complete export documentation package including packing list, bill of lading, certificate of origin, and welding procedure specifications (WPS/PQR) for any fabricated components
- Material traceability report linking each bundle to its original heat number, rolling date, and test results from our in-house laboratory
Packaging, Loading & Delivery
- Rectangular tubes bundled with steel strips and edge protectors to prevent coating damage during ocean transit, with surface treatment (galvanized, oiled, or shop primer) preserved by interleaving separators
- Custom-cut lengths from 1m to 16m loaded in dedicated containers optimized for rectangular section nesting, maximizing payload per 20ft or 40ft unit
- Heat number and steel grade (SS400, Q235, S355JR) stenciled on each bundle end for immediate site identification and traceability verification
- FOB, CIF, or DDP delivery terms available from Qingdao port, with professional lashing and load-securing plans for oversized rectangular sections up to 800mm wide
- Full export documentation and tracking provided until site delivery, with container loading photos and weight certificates issued before vessel departure
Getting Your Rectangular Tube Quote with Full Mill Documentation
Send your project drawings or specification list — including steel grade (SS400, Q235, S355JR), section size, wall thickness, length, and surface treatment — and we respond within 24 hours with a detailed quotation covering material, fabrication, coating, packing, and shipping. If you need non-standard dimensions or custom-cut components fabricated to your shop drawings, our engineering team will review the drawings and confirm feasibility before production begins. We also confirm all certification and customs documentation requirements for your destination country before the contract is signed.
Request a Quotation with Mill Test Certificate
Submit your rectangular tube specifications, steel grade, quantity, and destination port to receive a detailed quote with full material traceability documentation.
Contact XJY Structure
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
