Description
Factory-direct RHS tubes, no trading middlemen — Every ASTM A500 rectangular hollow section tube rolls from our own steel mill with full heat-number traceability from slab to finished section.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 Rectangular Hollow Section Tube |
| Product Type | Rectangular Steel Tube (Welded) |
| Steel Grade | Gr.B, S235, S275, S355, STK400, Q235B, Q345B |
| 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 (Welded) |
| Surface Treatment | Black Painted / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Construction Structure, Building, Curtain Wall, Support Tubes, Steel Structure, Fertilizer Equipment |
| MOQ | 10 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Building frames, column-beam assemblies, curtain wall support grids |
| Industrial Facilities | Warehouse portal frames, mezzanine platforms, equipment support structures |
| Infrastructure | Bridge handrail posts, signage gantries, conveyor support frames |
| Agricultural & Fertilizer | Fertilizer equipment frames, silo support columns, irrigation gantry structures |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A ±1% tolerance on a 10mm wall RHS means every piece ships within 9.9–10.1mm — not 9.2mm disguised as 10mm.
Procurement teams sourcing an ASTM A500 rectangular hollow section tube from fragmented suppliers often discover the gap between mill certificate claims and actual site measurements only after containers arrive. A third-party inspector measuring 4.2mm on tubes certified as 5mm wall thickness triggers batch rejection, structural recalculation, and crane-schedule delays that no amount of paperwork can recover. The root cause is rarely malice — it is the absence of vertical integration, where the fabricator has no control over the raw material they are welding. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How ERW Rectangular Hollow Sections Match Structural Frame Demands
An ASTM A500 rectangular hollow section tube in S355 or Q345B grade delivers the flat-face geometry that bolted and welded moment connections require — unlike circular sections that need expensive saddle connectors. The 15×20mm to 700×800mm range covers everything from light-gauge purlin supports to heavy column sections in warehouse portal frames. Our own steel mill produces the strip coil, forms it through continuous ERW welding, and shapes it into rectangular sections under one quality system — so the chemical composition on the mill test certificate matches the tube that arrives on your jobsite in Dubai or Ho Chi Minh City.
Engineering Compliance Across ASTM, EN, and GB Frameworks
Projects specifying ASTM A500 Gr.B for North American markets, EN 10219 S355JR for European construction, or GB/T 3091 Q235B for domestic Chinese infrastructure all draw from the same production line — with grade-specific chemistry and mechanical properties verified per standard. Surface treatment selection (hot-dip galvanized for coastal corrosion, black painted for indoor dry environments, bare for field-coated applications) must align with the project’s environmental exposure class. [NEED_CITE: steel grade equivalence mapping between ASTM A500 and EN 10219] Third-party inspection by SGS or BV before shipment provides independent verification for projects requiring EN 10204 3.2 certificates.
Steel Grade Selection and ERW Weld Integrity
The S-series grades (S235, S275, S355) follow European yield strength increments — each step up allows thinner walls for the same load, reducing tonnage and shipping cost. Q-series Chinese grades (Q235B, Q345B) map closely to S235 and S355 respectively, while ASTM A500 Gr.B sits between S275 and S355 in typical project specifications. ERW welding produces a longitudinal seam that undergoes the same NDT inspection as the parent metal — certified WPS and PQR procedures ensure weld integrity matches the base material across the full 1–30mm wall thickness range. Negative tolerance on wall thickness directly affects theoretical weight calculations; a 10mm wall at -5% tolerance reduces section modulus and load capacity, which is why our ±1% tolerance range exists. [NEED_CITE: effect of wall thickness tolerance on structural hollow section load capacity]
The Hidden Cost of Unverified Material Certificates
Accepting a mill test certificate from a trader who sources tubes from multiple unknown mills means you cannot trace the heat number back to the original slab chemistry. When customs authorities in the EU or Middle East demand EN 10204 3.2 certification and the supplier cannot provide it, the shipment sits at port — accruing demurrage while the project waits. Structural engineers rejecting non-conforming material after installation cranes are already on-site create cascading delays that no discount on the original invoice can offset. [NEED_CITE: EN 10204 inspection document types for steel products]
Why Procurement Teams Source ASTM A500 Rectangular Hollow Section Tube From Us
Our vertically integrated operation — own steel mill producing 2,800+ raw material specifications plus a dedicated fabrication workshop — eliminates the traceability gap that causes most overseas procurement failures. Every ASTM A500 rectangular hollow section tube ships with a mill test certificate traceable to heat number, produced under ISO 9001 quality management with certified welding procedures. We supply general contractors and EPC firms across the Middle East, Southeast Asia, and Africa who need one source accountable for both material quality and dimensional accuracy. Custom non-standard sizes, fixed-length cutting, and project-specific surface treatment are handled in-house — not outsourced to unknown subcontractors.
Documentation & Compliance
- Mill test certificate documenting Gr.B / S355 / Q345B chemical composition and mechanical properties per ASTM A500 or EN 10219, traceable by heat number
- CE certificate confirming EN 10219 compliance for rectangular hollow sections exported to European Union markets
- ISO 9001 quality management certificate covering the full production chain from raw steel to finished RHS tube
- SGS or BV third-party inspection report available before shipment for projects requiring independent verification
- Complete customs documentation package: packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- ERW welded rectangular tubes bundled with high-tensile steel strips, separated by rubber pads to prevent surface damage on galvanized or painted finishes
- Galvanized ASTM A500 rectangular hollow section tubes packed with edge protectors and waterproof wrapping to preserve zinc coating during ocean transit
- Container loading plans optimized for 5.8m and 6m lengths in 20ft containers, 11.8m and 12m lengths in 40ft open-top or flat-rack containers for oversized sections up to 700×800mm
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification upon arrival
- FOB, CIF, and DDP shipping terms available with professional oversized cargo lashing and transport planning
How to Request a Quotation With Full Material Traceability
Send your project drawings (PDF or DWG), required steel grade, section dimensions, wall thickness, surface treatment, and destination port — we respond within 24 hours with pricing, shop drawing timeline, and mill test certificate sample. For non-standard sizes outside the 15×20mm to 700×800mm range, our engineering team provides feasibility assessment and production scheduling.
Start Your ASTM A500 Rectangular Hollow Section Tube Inquiry
Submit your specifications and steel grade requirements to receive a detailed quotation with full material certification and production schedule.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
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
