Description
Factory-direct ERW square hollow sections — Every S275JR tube passes dual verification in our in-house physical and chemical laboratory before container loading, eliminating third-party re-inspection surprises.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S275JR ERW Square Steel Tube |
| Product Type | Square Hollow Section (SHS) / Rectangular Hollow Section (RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J2H, S355J0H, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219, ASTM A53, ASTM A500 |
| Section Shape | Square / Rectangular |
| Size Range | 10×10mm – 1200×1200mm (Square); 20×30mm – 600×800mm (Rectangular) |
| Wall Thickness | 0.5mm – 50mm |
| Length | 5.8m – 14m or customized |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Galvanized / 3PE / Varnish |
| Tolerance | ±1% |
| Ends | Plain ends / Cutting / Threading / Beveled / Flange |
| Application | Steel structures / Construction frames / Machinery structure / Scaffolding / Furniture / Urban & civil construction / Greenhouse / Low pressure fluid transport / Agriculture equipment |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Construction | Building frames, scaffolding systems, urban infrastructure columns |
| Machinery Manufacturers | Equipment frames, conveyor support structures, industrial platform bases |
| Infrastructure Developers | Bridge support members, greenhouse structural frames, agriculture machinery chassis |
| System Integrators | Automation line frames, material handling gantries, modular industrial enclosures |
Where EN10219 Certification Decides Customs Clearance for S275JR ERW Square Steel Tube
Missing mill test certificates or incomplete CE documentation can hold an entire structural steel shipment at port for weeks.
I shipped a batch of S275JR square hollow sections to a Middle East contractor years ago. The mill cert said S275JR, but their third-party inspector flagged the yield strength borderline — barely passing, but it cost us a week of delays and a re-inspection fee. Since then, every tube leaving our lab gets double-checked against EN 10210 before it ever hits the container. [NEED_CITE: EN 10219 cold-formed hollow section dimensional and mechanical requirements]
Fragmented sourcing from multiple suppliers means inconsistent material traceability and mismatched certifications. When a project requires S275JR per EN10219, receiving tubes with only domestic standard documentation creates compliance gaps that surface only at customs or during structural inspection.
How Wall-Thickness Tolerance Affects Structural Frame Assembly
Precise ±1% wall-thickness tolerance on S275JR ERW square steel tube ensures consistent load-bearing capacity across every member in a structural frame. When thickness varies beyond tolerance, connection plates may not align properly, bolt holes drift, and field rework becomes unavoidable. Our ERW lines maintain hydrostatic testing and dimensional inspection at every production stage, so the 0.5mm to 50mm thickness range stays within specification regardless of whether you need thin-wall furniture frames or heavy-duty structural columns.
Engineering Compliance and Corrosion Environment Selection
Structural steel frames designed under EN 1993 or AISC specifications require verified steel grades with documented chemical composition and mechanical properties [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards]. For outdoor or humid environments, galvanized or 3PE-coated S275JR tubes resist corrosion without compromising weldability at connection points. Indoor machinery frames may only require oiled or bare finish, while greenhouse structures benefit from galvanized coating to withstand constant moisture exposure. CE certification under EN 10210/EN 10219 is mandatory for EU project compliance, and our Lloyd’s Register certification ensures documentation meets port authority requirements.
Understanding S-Series Steel Grades and ERW Welding for Structural Tubes
The S-series designation (S235JR, S275JR, S355JR, S355J2H) indicates minimum yield strength in MPa, with higher grades providing greater load capacity for the same cross-section. S275JR sits in the middle range, offering balanced strength and weldability for general structural applications. ERW welding produces a continuous longitudinal seam with hydrostatic testing verification, making it cost-effective for square and rectangular profiles compared to seamless alternatives. The proprietary sharp-corner rectangular tube technology fills gaps in global specifications, delivering tighter corner radii that improve connection fit-up and structural appearance. Surface treatment selection depends on service environment: hot-rolled bare for indoor use, galvanized for moisture exposure, 3PE coating for buried or highly corrosive conditions.
Hidden Costs of Incorrect Steel Grade Selection
Ordering S235JR when structural calculations require S275JR creates safety margins that fail under load testing, leading to costly member replacement after installation. Material certification gaps — such as missing heat number traceability or incomplete chemical composition reports — trigger third-party re-inspection fees and project delays. [NEED_CITE: structural steel procurement compliance requirements for international projects] Negative tolerance abuse reduces actual wall thickness below design specifications, compromising load capacity while appearing compliant on paper. These hidden costs surface during engineering inspection or structural load testing, long after the purchase order is closed.
Why Engineering Procurement Teams Choose Our S275JR ERW Square Steel Tube
Factory-direct pricing eliminates trading company margins on every ton shipped. Our in-house physical and chemical laboratory produces original mill test certificates documenting chemical composition and mechanical properties per EN10219, verified by SGS and BV third-party inspection. With 2,800+ specifications covering 10×10mm to 1200×1200mm square sections and wall thickness up to 50mm, we consolidate multi-spec orders into single shipments. The 41 patented technologies include proprietary sharp-corner rectangular tube manufacturing that meets non-standard project requirements. Lloyd’s Register EU CE certification (EN 10210/EN10219) and Singapore FPC ensure documentation compliance across 50+ export markets. Professional container loading optimization and door-to-door logistics coordination reduce transit damage and customs clearance delays.
Documentation & Compliance
- Mill test certificate documenting S275JR chemical composition and yield strength per EN10219, with heat number traceability
- Lloyd’s Register EU CE certificate confirming EN 10210/EN10219 compliance for structural hollow sections
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report with dimensional verification and visual inspection documentation
- Material traceability records linking each tube to specific heat numbers and production batches
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S275JR ERW square steel tubes bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Galvanized tubes packed with waterproof wrapping to preserve zinc coating integrity throughout container shipping
- Container loading plans optimized for 5.8m to 14m lengths, maximizing payload while maintaining weight distribution
- Custom cutting to project-specific lengths available, with cut ends protected by plastic caps to prevent corrosion
- Heat number and steel grade stenciled on each bundle for site identification and traceability verification
- FOB, CIF, and DDP shipping options with real-time tracking from Jinan port to destination
Getting Your S275JR ERW Square Steel Tube Quote Started
Submit your specification requirements including section dimensions, wall thickness, steel grade, quantity, and destination port to receive a detailed quotation within 12 hours. We provide original mill test certificates and third-party inspection reports for quality confirmation before production begins. Custom non-standard dimensions and surface treatment options are available for project-specific requirements.
Start Your S275JR Structural Steel Procurement
Send your specifications via email or WhatsApp to receive pricing, mill test certificates, and delivery timelines.
Email: admin@sdxjysteel.com
Mobile/WhatsApp: +86 188 5315 7756
Frequently Asked Questions
Q: What is the difference between S275JR and ASTM A500 Grade B for structural applications?
A: S275JR follows EN 10219 European standards with minimum 275 MPa yield strength, while ASTM A500 Grade B follows American standards with different chemical composition requirements. Both grades serve similar structural purposes, but project specifications determine which standard applies. We provide material certification for both standards and can supply equivalence documentation for engineering approval.
Q: Can you provide third-party inspection reports for EU customs clearance?
A: Yes, we arrange SGS or BV third-party inspection with full dimensional verification, visual inspection, and material testing reports. Our Lloyd’s Register EU CE certification under EN 10210/EN10219 ensures documentation meets EU port authority requirements. Original mill test certificates accompany every shipment for material traceability.
Q: What is the minimum order quantity for custom non-standard dimensions?
A: Our MOQ is 1 Ton for standard specifications, and we can produce custom non-standard dimensions within our 2,800+ specification range. Wall thickness up to 50mm and special section sizes are available through our dedicated production lines with proprietary sharp-corner technology.
Q: How do you ensure wall thickness tolerance stays within ±1%?
A: Our in-house physical and chemical laboratory conducts incoming material inspection, in-process dimensional checks, and final verification before shipment. ERW production lines maintain real-time monitoring with hydrostatic testing and ultrasonic inspection to ensure every S275JR tube meets EN10219 tolerance requirements.
Q: What surface treatment options are available for outdoor structural applications?
A: We offer hot-dip galvanized coating for moisture resistance, 3PE coating for buried or highly corrosive environments, painted finish for aesthetic requirements, and oiled treatment for temporary protection during transit. Surface treatment selection depends on service environment and project specifications.
