Description
Factory-Direct ERW Rectangular Tubes — 2,800+ specifications in stock with wall thickness up to 30mm, shipped directly from our Jinan production lines to your project site.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Welded Rectangular Steel Tube |
| Product Type | Welded Square and Rectangular Steel Tube |
| Steel Grade | Gr.B, S235, S275, S355, STK400, A53(A.B) |
| 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 | Welded (ERW) |
| Surface Treatment | Black Painting / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Curtain wall / Support tubes / Building structures |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, column supports, bridge railings, scaffolding structures |
| Architectural Facades | Glass curtain wall framing, decorative facade systems, sharp-corner exposed structures |
| Industrial & Machinery | Conveyor supports, equipment bases, machine guards, industrial platform frames |
| Steel Structure Fabrication | Primary and secondary structural members, purlins, truss components |
Where Dimensional Tolerance Decides Site Assembly Speed
±1% tolerance on every ASTM A500 welded rectangular steel tube we ship.
I’ve seen project timelines slip by weeks because rectangular tubes arrived with corner radii that didn’t match the connection plates fabricated back home. Standard ERW tubes often come off the line with R≥2t corners — fine for hidden structural work, but a liability when they’re exposed in a curtain wall system or bolted into a precision-machined bracket. The ASTM A500 welded rectangular steel tube supplier you choose needs to hold dimensional consistency across the full 15×20mm to 700×800mm range, or your fitters will spend days grinding and re-drilling on site. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Matching Structural Load Paths in Curtain Wall and Frame Systems
When an ASTM A500 welded rectangular steel tube goes into a glass curtain wall grid, the sharp-corner profile matters as much as the steel grade. Our patented right-angle technology produces corners that sit flush against mullion brackets — no gaps, no shimming, no visual inconsistency across a 40-story facade. For primary building frames, the 1–30mm wall thickness range covers everything from lightweight purlin supports to heavy-load transfer beams, and the ±1% tolerance means your structural engineer’s calculations hold true from first tube to last.
Engineering Compliance Across ASTM, EN, and GB Frameworks
Structural designers specifying ASTM A500 Gr.B for North American projects or S355 for European tenders need certainty that the mill test certificates will pass third-party scrutiny. Our ASTM A500 welded rectangular steel tubes ship with full chemical and mechanical documentation traceable by heat number, and our Lloyd’s CE certification under EN 10210/10219 clears customs in EU markets without re-inspection delays. For projects in Southeast Asia and the Middle East, we provide Singapore FPC documentation alongside SGS or BV pre-shipment verification — because a missing stamp at the port can hold a container for weeks. [NEED_CITE: steel grade equivalence mapping between ASTM A500 and EN 10219 standards]
Understanding ERW Weld Quality and Surface Treatment Selection
The ERW welding process we use for these rectangular tubes produces a consistent longitudinal weld seam that meets ASTM A500 requirements for structural applications. Unlike seamless alternatives, ERW offers cost efficiency across the 15×20mm to 700×800mm size range without sacrificing the dimensional accuracy your project demands. Surface treatment choice depends on your installation environment: black painted tubes work for interior structural frames where aesthetics are secondary; hot-dip galvanized finishes protect outdoor facade members and industrial supports from corrosion; bare or varnished tubes suit projects where the fabricator will apply custom coatings on site. Wall thickness tolerance at ±1% ensures that theoretical weight calculations match actual delivered weight — critical when your procurement budget is tied to tonnage.
The Hidden Cost of Incorrect Grade Documentation
Ordering S355 tubes that arrive with Gr.B certificates — or vice versa — doesn’t just create paperwork headaches. Structural engineers sign off on load calculations based on specific yield strength grades, and material substitution without approval can trigger full re-engineering, project stoppage, or worse, structural failure under load. [NEED_CITE: consequences of steel grade misidentification in structural construction] An ASTM A500 welded rectangular steel tube supplier who cannot provide heat-number traceability and third-party verification is gambling with your project timeline and your liability exposure.
Why Project Procurement Teams Specify SD XJY Pipe
Our Jinan facility operates three dedicated ERW lines covering 2,800+ specifications — meaning your 700×800×30mm heavy-wall order and your 15×20×1.5mm light-gauge batch come from the same supply chain with the same quality controls. We hold 41 invention patents including China’s original sharp-corner rectangular tube technology, so when your architectural facade demands true 90-degree corners rather than the rounded profiles typical mills produce, we deliver. Every shipment includes mill test certificates from our in-house physical and chemical laboratory, and we arrange SGS or BV inspection before loading — not after a problem surfaces at destination. Our professional container loading team understands how rectangular tubes shift during ocean transit, and our anti-damage protocols have eliminated the bending rejections that plague less experienced exporters. Full ISO 9001:2015, Lloyd’s CE, and Singapore FPC certifications travel with every container, clearing customs in 50+ countries without documentation disputes.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Gr.B or S355 chemical composition and mechanical properties per heat number
- Lloyd’s CE certificate confirming compliance with EN 10210/EN 10219 for European market clearance
- ISO 9001:2015 quality management system certificate covering full production traceability
- SGS or BV third-party inspection report available upon request before container sealing
- Material traceability documentation linking each tube to specific heat number and production batch
- Complete customs package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- ASTM A500 welded rectangular steel tubes bundled with steel strips and edge protectors to prevent corner damage during transit
- Galvanized rectangular tubes wrapped with moisture-resistant barriers to preserve zinc coating integrity during ocean shipment
- Container loading optimized for 6m and 12m lengths with anti-shift bracing to eliminate bending on long-voyage routes
- Custom cutting available to project-specific lengths within the 5.8m–12m range, reducing on-site waste and handling
- Heat number and steel grade stenciled on each tube end for immediate site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with full export documentation and real-time container tracking
Getting Your ASTM A500 Rectangular Tube Quote Ready for Approval
Send us your size range, wall thickness, steel grade, surface treatment preference, and destination port — we’ll respond within 12 hours with pricing, lead time, and mill test certificate samples. For non-standard dimensions outside the 15×20mm to 700×800mm catalog range, our engineering team will confirm feasibility and tooling requirements. If your project requires SGS or BV pre-shipment inspection, we’ll coordinate the schedule directly with your nominated surveyor.
Frequently Asked Questions
Q: Can you supply ASTM A500 Gr.B and EN S355JR from the same production line?
A: Yes. Our ERW lines produce multiple steel grades including Gr.B, S235, S275, S355, and STK400. Each heat is tested separately, and mill test certificates clearly identify the grade, chemical composition, and mechanical properties for full traceability.
Q: What is the minimum order quantity for custom non-standard rectangular tube sizes?
A: Our MOQ is 5 tons. For non-standard dimensions outside the 15×20mm to 700×800mm range, we evaluate tooling requirements and confirm production feasibility before quoting.
Q: Do you arrange third-party inspection before shipment?
A: Yes. We coordinate SGS or BV inspection at our facility before container loading. The inspection covers dimensional verification, visual surface check, and witness testing. Full reports are provided to you before the container is sealed.
Q: How do you prevent rectangular tube corner damage during ocean freight?
A: We use steel strip bundling with edge protectors on all sharp-corner profiles, anti-shift bracing inside containers, and moisture barriers for galvanized finishes. Our loading team has specific protocols for rectangular and square tubes that eliminate the bending and corner deformation common in poorly loaded shipments.
Q: Can you provide mill test certificates for ASTM A500 and EN 10219 on the same order?
A: Yes. If your order includes mixed grades or standards for different project zones, we issue separate mill test certificates for each standard, with heat-number traceability linking every tube to its specific test results.
Request Your ASTM A500 Welded Rectangular Steel Tube Quotation
Submit your specifications — size, wall thickness, grade, surface treatment, quantity, and destination — and receive pricing with mill test certificate samples within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
