Description
Direct Mill Supply, No Middlemen — We roll, weld, and ship ASTM A500 and EN 10219 square rectangular hollow section from our own steel mill in Jinan, giving you one source for material, fabrication, and certification.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | ASTM A500 / EN 10219 / EN 10210 / NZS 1163 Square and Rectangular Hollow Section |
| Product Type | Square / Rectangular Steel Tube (Hollow Section) |
| Steel Grade | Gr.B, S235, S275, S355, STK400, Q235B, Q345B |
| Standard | ASTM A500, ASTM A53, EN 10219, EN 10210, NZS 1163, GB/T 3091 |
| Section Shape | Square / Rectangular |
| Size Range | 19mm × 19mm – 800mm × 800mm |
| Wall Thickness | 1 – 30 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | ERW (Welded) / Seamless |
| Surface Treatment | Black Painted / Galvanized / Varnish / Bare |
| Tolerance | ±1% |
| Ends | Plain |
| Application | Steel structures / Construction frames / Building structures / Curtain wall / Support structures / Machinery / Scaffolding |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & General Contractors | Steel frame structures for warehouses, logistics centers, and industrial plants |
| Steel Structure Companies | Column-beam assemblies, trusses, and connection nodes for commercial buildings |
| Infrastructure Developers | Support structures for solar mounting systems, conveyor frames, and bridge railings |
| Machinery & Equipment Builders | Machine bases, equipment frames, and hydraulic support structures |
| Architecture & Engineering Firms | Curtain wall sub-frames, decorative structural elements, and stairway stringers |
Where Negative Tolerance on Wall Thickness Triggers Customs Rejection
A 0.3mm wall deviation on an ASTM A500 Gr.B tube can void an entire container at destination port inspection.
When buyers source square rectangular hollow section from fragmented traders who resell mill overruns, wall thickness often drifts below the ±1% tolerance band. I once watched a shipment of SHS 200×200 get held at Apapa port because the third-party inspector found wall readings consistently 8% under nominal — the trader had blended off-spec batches from three different mills. The re-sorting cost more than the freight. With vertically integrated production from our own steel mill, every heat number on the mill test certificate traces back to a single rolling campaign, so tolerance stays within the ASTM A500 and EN 10219 envelope from first tube to last. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed hollow sections]
How Section Geometry Meets Structural Load Paths
Square and rectangular hollow sections from 19×19mm up to 800×800mm cover everything from light-gauge purlin framing to heavy column sections in multi-storey buildings. The closed section provides torsional rigidity that open profiles cannot match, making this square rectangular hollow section the preferred choice for moment-resisting frames and bracing members in seismic zones. Our ERW welded process produces consistent corner radii that fit flush against gusset plates and base plates, reducing fit-up time on site. For projects requiring higher load capacity in corrosive environments, galvanized finish extends service life without sacrificing dimensional accuracy.
Engineering Compliance Across Multiple Standard Frameworks
Structural engineers specifying EN 10219 for European projects or ASTM A500 for North American exports need more than a product — they need traceable certification that survives customs and site inspection. Our square rectangular hollow section conforms to EN 10219, EN 10210, ASTM A500, ASTM A53, and NZS 1163 from a single production line, meaning the same S355 grade can ship to Lagos, Rotterdam, or Auckland with the correct standard designation on the mill test certificate. CE marking under EN 10210 clears EU customs without additional testing, while ASTM A500 Gr.B documentation satisfies AISC fabrication requirements. [NEED_CITE: CE marking requirements for structural hollow sections under EN 10210]
Steel Grade Selection and Welding Process Fundamentals
The jump from S235 to S355 delivers higher yield strength for reduced section sizes in heavily loaded columns, while Q345B serves as the Chinese domestic equivalent for projects blending international and local specifications. Our ERW welded tubes use high-frequency induction welding that produces a weld seam with mechanical properties matching the parent metal — critical when the square rectangular hollow section will undergo subsequent bending or drilling at fabrication shops. Seamless options eliminate the weld line entirely for applications where internal corrosion or high-pressure service demands homogeneous wall integrity. Surface treatment choice — black painted for indoor structural frames, hot-dip galvanized for outdoor scaffolding and coastal infrastructure — directly affects both long-term maintenance cost and initial procurement budget. [NEED_CITE: steel grade equivalence between EN S355 and ASTM A500 Gr.B]
The Hidden Cost of Unverified Material Certificates
Purchasing square rectangular hollow section from traders who cannot provide heat-level traceability creates three failure modes: customs rejection due to missing CE or ASTM documentation, structural inspection failure when actual chemistry diverges from the certificate, and welding procedure disqualification when the mill test certificate does not match the delivered heat number. Each failure triggers re-inspection, re-certification, or complete replacement — costs that dwarf the original price difference between a verified mill source and an unverified reseller. [NEED_CITE: material traceability requirements under EN 10219 and ASTM A500]
Why Integrated Mill-to-Fabrication Sourcing Eliminates Procurement Risk
Our own steel mill in Jinan operates three production lines covering 2,800+ specifications of raw material, so every square rectangular hollow section we ship starts from steel we melted and rolled — not purchased from third-party mills with blended certificates. The in-house理化实验室 issues mill test certificates documenting chemical composition and mechanical properties for every heat, and we hold CE certification under EN 10210/EN 10219, ISO 9001, and accept SGS or BV third-party inspection at buyer’s request. For projects requiring custom lengths beyond standard 6m and 12m, or non-standard dimensions outside the 19×19mm to 800×800mm range, our fabrication workshop handles CNC cutting, drilling, and welding per approved WPS procedures. Professional container loading plans maximize payload for 20ft and 40ft shipments, and we provide complete export documentation including packing list, bill of lading, and certificate of origin.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN 10219, with heat number traceability to our own steel mill
- CE certificate covering EN 10210 and EN 10219 structural hollow sections for EU market access and customs clearance
- ISO 9001 quality management certificate covering the full production chain from raw steel rolling to finished tube inspection
- SGS or BV third-party inspection report available upon request for independent verification of dimensional tolerance and surface quality
- Material traceability by heat number linking each ASTM A500 Gr.B or S355 tube to its original melt chemistry and rolling record
- Complete customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- Galvanized square rectangular hollow section bundled with steel strips and edge protectors to preserve zinc coating integrity during ocean transit
- Black painted tubes wrapped in waterproof cloth with wooden dunnage separation to prevent surface scratching across 6m and 12m lengths
- Container loading optimization for mixed-size shipments combining small-section SHS 50×50 with large-section RHS 400×200 to maximize 40ft high-cube payload
- Custom cut-to-length service available for 5.8m and 11.8m requirements matching specific project module dimensions
- Heat number and steel grade stenciled on each tube end for on-site identification and inspection traceability
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door delivery with full export documentation support
How to Initiate a Project Inquiry for Structural Hollow Sections
Submit your project drawings in PDF or DWG format along with required steel grades, section dimensions, total tonnage, and destination port — we respond within 24 hours with a detailed quotation covering material, fabrication, coating, and shipping costs. For projects requiring EN 10219 or ASTM A500 compliance, confirm your certification and third-party inspection requirements upfront so we can include mill test certificate and SGS/BV inspection fees in the initial quote. Our engineering team will review shop drawings and provide material optimization recommendations before production begins, ensuring the square rectangular hollow section specification matches both structural design intent and fabrication efficiency.
Frequently Asked Questions
Q: Can S355JR per EN 10219 substitute for ASTM A500 Gr.B on the same project?
A: S355JR and ASTM A500 Gr.B have different chemical composition and mechanical property requirements under their respective standards. We produce both grades from our own mill and issue separate mill test certificates for each — substitution requires engineer approval based on project-specific load calculations and local code acceptance.
Q: What documentation do you provide for EU customs clearance?
A: Every shipment of EN 10219 or EN 10210 square rectangular hollow section includes CE certification, mill test certificate with heat number traceability, packing list, bill of lading, and certificate of origin. Third-party inspection reports from SGS or BV are available upon request for additional compliance verification.
Q: Do you accept orders below 5 tons for non-standard dimensions?
A: Our standard MOQ is 5 tons, but for custom non-standard sizes outside the 19×19mm to 800×800mm range, we can accommodate smaller quantities through our fabrication workshop. Lead times and pricing depend on the specific dimension and steel grade required.
Q: How do you handle wall thickness tolerance for ASTM A500 orders?
A: All ASTM A500 square rectangular hollow section maintains ±1% wall thickness tolerance verified by ultrasonic measurement at multiple points along each tube. Every heat number is documented on the mill test certificate, and third-party inspection can verify tolerance compliance before shipment.
Q: What is the difference between ERW welded and seamless hollow sections for structural use?
A: ERW welded tubes use high-frequency induction welding suitable for most structural framing applications where the weld seam meets the same mechanical standards as the parent metal. Seamless tubes eliminate the weld line entirely, preferred for applications involving internal corrosion exposure or where homogeneous wall integrity is critical.
Get Your ASTM A500 / EN 10219 Square Rectangular Hollow Section Quote Today
Send your project specifications, steel grade requirements, and destination port to receive a detailed quotation with mill test certificate documentation within 24 hours.
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
