Description
Factory-Direct ERW RHS Supply — Shandong Xin Jiyuan Special Steel Tube Co., Ltd manufactures and exports ASTM A500 rectangular hollow sections directly, eliminating trading margins on structural tube orders.
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, Q235, Q345 |
| 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 Structures, Machinery |
| MOQ | 10 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| High-Rise Construction | Building frames, curtain wall support grids, column-to-beam connections |
| Industrial Fabrication | Machinery bases, conveyor structures, equipment support frames |
| Infrastructure | Bridge handrail posts, highway sign gantries, utility support towers |
| Steel Structure Workshops | Portal frame purlins, crane runway beams, mezzanine flooring supports |
What Wall-Thickness Deviation Costs on a High-Rise Frame Order
A ±1% tolerance control on ERW welded RHS prevents structural rejections at site inspection.
When rectangular hollow sections arrive at a Jakarta high-rise site with wall thickness falling outside the specified tolerance, the structural engineer has only one option — reject the entire batch. I watched a container of RHS get turned away because the caliper readings did not match the mill cert. The replacement tubes had to be air-freighted, turning a routine procurement into a five-figure loss. Beyond the financial hit, grade confusion between ASTM A500, EN 10219, and GB/T 6728 compounds the problem — buyers specify one standard and receive tubes stamped to another, creating traceability gaps that fail third-party inspection. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How ERW Welded RHS Matches Structural Frame Requirements
An ASTM A500 Rectangular Hollow Section Tube in S355 or Gr.B delivers the flat bearing surfaces that bolted and welded connections demand on high-rise frames. The rectangular profile provides two-axis bending resistance, making it suitable for both column and beam roles in portal frame structures. ERW welding produces a consistent longitudinal seam that maintains dimensional accuracy across the 15mm×20mm to 700mm×800mm size range, while the ±1% wall thickness tolerance ensures that connection plates and gussets fit without on-site grinding. Our supply chain covers the full spectrum from small-section curtain wall supports to large-format column tubes for industrial workshops.
Engineering Compliance and Certification Pathways
Structural engineers designing to EN 1993 or AISC specifications require documented proof that the hollow sections meet the referenced material standard. For European projects, S235/S275/S355 grades must conform to EN 10219 dimensional and mechanical requirements; for North American exports, ASTM A500 Gr.B certification satisfies AISC loading calculations. Surface treatment selection — black painted for indoor frames, hot-dip galvanized for outdoor infrastructure, or bare for welded connections — must align with the project’s corrosion environment specification. Third-party inspection by SGS or BV before shipment provides the independent verification that customs authorities and site inspectors require. [NEED_CITE: ASTM A500 structural tubing certification for AISC compliance]
Steel Grade Selection and ERW Process Fundamentals
The S-series grades (S235, S275, S355) follow the European EN system where the number indicates minimum yield strength in MPa — S355 delivers higher load-bearing capacity than S235, allowing designers to reduce section size for the same structural demand. The ASTM A500 Gr.B grade serves the same function in the North American specification system, while Q235 and Q345 cover the Chinese GB/T standard range. Cross-standard equivalence between these systems is not automatic — S355JR does not perfectly match Gr.B in chemical composition limits, and procurement teams must verify equivalence tables rather than assume interchangeability. ERW welding forms the rectangular section from coiled strip, passing it through forming rolls and welding the longitudinal seam — this process produces tighter dimensional tolerances than SSAW and lower cost than seamless, making it the standard choice for structural applications below 30mm wall thickness. Surface treatment options address different exposure conditions: hot-dip galvanizing provides sacrificial zinc protection for outdoor infrastructure, while black painted or varnish coatings suit indoor structural frames where welding will follow installation.
Hidden Costs of Unverified RHS Procurement
Purchasing ASTM A500 Rectangular Hollow Section Tube without verified mill test certificates creates downstream risk at every project stage. Tubes with undocumented chemical composition fail third-party inspection, triggering shipment holds and demurrage charges. Negative tolerance beyond the ±1% specification reduces actual load capacity below design assumptions — a risk that only surfaces during structural testing or, worse, under service loads. Grade substitution without notification means the delivered tubes may carry a different designation than specified, voiding engineering approvals and requiring costly re-certification or replacement. [NEED_CITE: consequences of missing mill test certificates in structural steel procurement]
Why Procurement Teams Source RHS from Xin Jiyuan
Shandong Xin Jiyuan Special Steel Tube Co., Ltd operates dedicated ERW production lines for rectangular hollow sections, supplying directly to projects without trading intermediaries. Our in-house testing laboratory issues original mill test certificates for every heat, documenting chemical composition and mechanical properties with full traceability from coil to finished tube. The inventory spans over 2,800 specification combinations across the 15mm×20mm to 700mm×800mm range, allowing single-source procurement for projects requiring multiple section sizes. Custom cutting to length, plasma preparation for welded connections, and end-facing services eliminate secondary processing at the fabrication shop. Professional heavy-cargo loading using flatbed and open-top containers prevents transit damage to galvanized coatings and maintains dimensional integrity. ISO 9001:2015 certification and Lloyd’s CE marking satisfy international quality and compliance requirements, while SGS/BV third-party inspection is available for projects demanding independent verification.
Documentation & Compliance
- Mill test certificate documenting ASTM A500 Gr.B or S355 chemical composition and yield strength per the referenced standard
- CE certificate confirming EN 10219 compliance for rectangular hollow sections exported to European markets
- ISO 9001:2015 quality management certificate covering the full ERW welded RHS production process
- SGS or BV third-party inspection report verifying dimensional accuracy and surface treatment thickness before shipment
- Material traceability linking each tube to its heat number, coil origin, and production date
- Complete customs documentation including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- ERW welded rectangular tubes bundled with steel strips and edge protectors to preserve galvanized coating integrity during ocean transit
- Black painted or varnished RHS separated by protective interleaving to prevent surface damage from friction during transport
- Container loading optimized for the 5.8m and 11.8m standard lengths to maximize payload within weight restrictions for heavy-wall sections
- Custom cut-to-length tubes packed in dedicated crates with heat number and steel grade markings visible for site identification
- FOB, CIF, and DDP shipping terms available with professional flatbed and open-top container loading for oversized RHS sections
- Full export documentation and real-time tracking provided from mill dispatch through to port arrival
Initiate Your RHS Procurement with Verified Specifications
Submit your ASTM A500 Rectangular Hollow Section Tube requirements — including steel grade, section dimensions, wall thickness, quantity, and destination port — to receive a detailed quotation with original mill test certificate preview and shipping terms. Our technical team confirms standard equivalence, custom cutting feasibility, and third-party inspection availability within 12 hours of inquiry.
Request Quotation and Mill Test Certificate
Send your ASTM A500 rectangular hollow section specifications to admin@xjyplate.com or contact via WhatsApp at +86 188 5315 7756 for pricing, MTC review, and delivery scheduling.
