Description
EN10219 S355JR square and rectangular steel tube direct mill supply — Full range of cold-formed structural hollow sections from 15×15 mm to 1000×1000 mm available from Shandong ready stock with original mill test certificates.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR / S355J2H Square & Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J0H, S355J2H, ASTM A53 GR.B, A36, SS400, Q460 |
| Standard | EN10219, EN10210 |
| Section Shape | Square / Rectangular |
| Size Range | Square: 15×15 mm – 1000×1000 mm; Rectangular: 20×30 mm – 600×800 mm |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m or as required |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Galvanized / Black (Bare) / Oiled / Painted / 3PE Coating |
| Ends | Plain / Cut / Threaded / Beveled |
| Tolerance | ±1% |
| Application | Steel structures, construction frames, machinery, scaffolding, furniture, greenhouse, low pressure fluid transport, building materials |
| MOQ | 1 Ton |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Fabricators | Structural frames, equipment supports, machinery bases, load-bearing columns |
| Construction Companies | Scaffolding systems, building structures, high-rise frames, infrastructure projects |
| General Engineering | Greenhouse frames, furniture manufacturing, low-pressure fluid conveyance |
| Industrial Manufacturing | Conveyor structures, platform supports, warehouse racking systems |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
Negative tolerance beyond ±1% means rejected inspection and delayed project handover.
When sourcing EN10219 S355JR square and rectangular steel tube for structural applications, buyers frequently encounter wall thickness deviations that exceed allowable limits. A shipment may pass visual inspection at the port, but once the fabricator begins welding connections, actual thickness measurements reveal material below the specified minimum. The result: structural calculations no longer match delivered product, third-party inspectors flag non-conformance, and the entire batch faces rejection or costly renegotiation. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How S355JR Hollow Sections Match Structural Engineering Requirements
The EN10219 S355JR square and rectangular steel tube delivers yield strength suitable for load-bearing frames in commercial buildings and industrial facilities. With wall thickness ranging from 0.5 mm to 50 mm and side dimensions up to 1000×1000 mm, these hollow sections accommodate everything from light-duty furniture frames to heavy equipment supports. The ERW welding process ensures consistent seam quality, while the ±1% dimensional tolerance keeps fabrication predictable. For projects requiring European certification, EN10219 compliance provides clear documentation for customs clearance and structural approval.
Compliance with European Structural Standards and Site Processing
Structural engineers specifying EN 1993 design codes require hollow sections that meet EN10219 cold-formed welded structural hollow sections standards. The S355JR grade delivers minimum 355 MPa yield strength for thickness up to 16 mm, making it suitable for moment-resisting frames and bracing systems. When corrosion protection matters, hot-dip galvanized coating extends service life in outdoor or humid environments, while black or oiled finish works for indoor applications where painting follows. For European market projects, CE marking under EN10210 confirms conformity, and third-party inspection through SGS or BV provides independent verification before shipment. [NEED_CITE: CE marking requirements for structural steel hollow sections exported to EU]
Understanding Steel Grade Selection and ERW Welding Process
The S-series steel grades follow a logical progression: S235JR provides basic structural strength for light frames, S275JR offers moderate increase for medium-duty applications, and S355JR delivers higher yield strength for heavy structural work. The J0H and J2H variants add low-temperature impact testing at 0°C and -20°C respectively, essential for cold-climate installations. ERW welding joins the formed edges through electrical resistance heating, creating a continuous seam without filler material. This process suits medium-wall thickness hollow sections where seamless manufacturing would be cost-prohibitive. For corrosion protection choices, galvanized coating provides sacrificial zinc layer for outdoor exposure, while 3PE coating combines epoxy primer with polyethylene outer layer for buried or submerged applications. The ±1% tolerance standard ensures that theoretical weight calculations match actual delivered material, preventing disputes over invoiced versus received tonnage.
Hidden Costs of Non-Conforming Hollow Section Procurement
Purchasing EN10219 S355JR square and rectangular steel tube without verified mill test certificates creates downstream risk. When chemical composition or mechanical properties fail to match declared grade, structural engineers cannot certify load capacity, forcing redesign or replacement. Missing heat number traceability means inspectors cannot verify material origin, leading to customs holds or project rejection. Negative tolerance exceeding ±1% reduces actual load-bearing capacity below calculated values, creating safety concerns in moment-resisting frames. [NEED_CITE: structural steel procurement quality verification requirements]
Why Procurement Teams Choose Our Mill-Direct Supply
Every EN10219 S355JR square and rectangular steel tube ships with original mill test certificate documenting chemical composition and mechanical properties per heat number. Our Shandong facility maintains ready stock across 2800+ specifications, eliminating waiting periods for common sizes while custom orders roll to your exact length requirements. The in-house metallurgical laboratory tests every batch before release, ensuring S355JR grade meets EN10219 standards for yield strength and impact toughness. For European projects, CE certification under EN10210 and EN10219 provides clear documentation for structural approval and customs clearance. Third-party inspection through SGS or BV confirms dimensional accuracy and surface quality before container loading. Professional heavy cargo logistics team handles flatbed and open-top container loading, preventing damage to galvanized coating during ocean transit.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN10219 for each heat number
- CE certificate confirming EN10210/EN10219 conformity for structural hollow sections exported to European markets
- ISO 9001:2015 quality management certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying dimensional tolerance and surface treatment quality
- Material traceability linking each bundle to heat number, chemical analysis, and mechanical test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S355JR square and rectangular tubes bundled with steel strips and edge protectors to prevent coating damage during transit
- Galvanized finish hollow sections wrapped with waterproof paper and plastic film to preserve zinc layer in humid conditions
- Custom cut-to-length service available for 5.8 m to 14 m requirements, reducing on-site cutting waste
- Container loading optimized for heavy wall thickness sections using open-top or flatbed arrangements to avoid overweight penalties
- Heat number and steel grade marked on each tube end for site identification and inspection traceability
- FOB, CIF, and DDP shipping terms available with professional heavy cargo logistics coordination
Getting Your EN10219 Hollow Section Quote
Submit your specification requirements including steel grade, section dimensions, wall thickness, length, quantity, and destination port to receive detailed quotation with material cost, processing fees, and shipping terms within 12 hours. We provide original mill test certificate for your quality verification before shipment and support third-party inspection if required. For custom cutting or non-standard dimensions, our technical team reviews your drawing and confirms feasibility with production schedule.
Frequently Asked Questions
Q: What is the grade equivalence between EN10219 S355JR, ASTM A500, and GB Q345B?
A: S355JR per EN10219 corresponds to ASTM A572 Grade 50 in the American system and Q355B (formerly Q345B) in the Chinese GB/T 1591 standard. All three grades deliver minimum 355 MPa yield strength for thickness up to 16 mm, though impact testing temperatures and chemical composition limits vary slightly between standards.
Q: Can you provide Mill Test Certificates and support third-party inspection?
A: Every EN10219 S355JR square and rectangular steel tube shipment includes original mill test certificate showing chemical composition, yield strength, tensile strength, and elongation per heat number. We support SGS, BV, or other accredited third-party inspection agencies for independent verification before container loading.
Q: What is the MOQ for custom cut-to-length square and rectangular tubes?
A: The minimum order quantity is 1 ton for standard stock sizes. Custom cut-to-length orders follow the same 1 ton minimum, though specific length requirements may affect production scheduling depending on mill rolling programs.
Q: What are the differences between galvanized, black, and 3PE surface treatments?
A: Hot-dip galvanized coating provides zinc sacrificial protection for outdoor or corrosive environments, typically 60-80 microns thickness. Black or oiled finish suits indoor applications where painting follows installation. 3PE coating combines epoxy primer with polyethylene outer layer for buried or submerged applications requiring maximum corrosion resistance.
Q: How do you handle export documentation and CE marking for European buyers?
A: All EN10219 structural hollow sections carry CE marking per EN10210 for European market compliance. We provide complete export documentation including mill test certificate, packing list, bill of lading, and certificate of origin. For projects requiring Declaration of Performance, we supply the necessary technical documentation for structural approval.
Request Your EN10219 S355JR Hollow Section Quotation
Send your specification requirements to receive pricing with mill test certificate within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjyplate.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
