Description
Factory-direct S275JR ERW square steel tube supply — We produce and stock EN10210/EN10219 structural hollow sections in-house, eliminating trading margins while maintaining full mill test certificate traceability from steelmaking to container loading.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S275JR ERW Square Steel Tube |
| Product Type | Square and Rectangular Steel Tube (Hollow Section) |
| Steel Grade | S235JR, S275JR, S355JR, S355J2H, S355J0H, ASTM A53 GR.B, A36, SS400, Q460 |
| Standard | EN10210, EN10219 |
| Section Shape | Square / Rectangular |
| Size Range | 10×10 mm – 1200×1200 mm (Square); 15×15 mm – 1000×1000 mm / 20×30 mm – 600×800 mm (Rectangular) |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m or as required |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Varnish / Galvanized / 3PE / Coating |
| Tolerance | ±1% |
| Ends | Plain ends / Cutting / Threading / Beveled / Flange |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Urban and civil construction / Greenhouse / Low pressure fluid transport |
| MOQ | 1 Ton |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Fabricators | Structural frames for warehouses, heavy equipment bases, and load-bearing columns |
| Construction Companies | Building frames, scaffolding systems, and civil infrastructure supports |
| Machinery Manufacturing | Equipment frames, conveyor structures, and agricultural machinery chassis |
| Urban Construction | Greenhouse frameworks, street furniture, and low-pressure fluid transport lines |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A 0.3 mm deviation in wall thickness can shift an entire batch from code-compliant to rejected at site inspection.
When sourcing EN-standard structural hollow sections, buyers frequently encounter inconsistent grade equivalence between EN, ASTM, and GB systems, leading to wrong material selection for load-bearing applications. Missing or unverifiable mill test certificates make it impossible to confirm heat numbers, chemical composition, or mechanical properties before fabrication begins. And hidden negative tolerance practices — where actual wall thickness falls below the specified minimum — create structural safety risks that only surface during third-party inspection or, worse, after installation. These issues compound when orders are split across multiple suppliers, each with different quality control standards and documentation practices [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements].
How S275JR ERW Square Steel Tube Matches Structural Engineering Demands
S275JR ERW square steel tube delivers the yield strength and weldability required for structural frames in warehouses, commercial buildings, and industrial facilities. The ERW welding process produces a continuous longitudinal seam with consistent mechanical properties across the entire cross-section, while the ±1% tolerance control ensures that specified wall thickness translates directly to calculated load-bearing capacity. For projects requiring marine-grade or high-stress environments, upgrading to S355J2H provides enhanced impact resistance at sub-zero temperatures, and galvanized or 3PE surface treatment extends service life in corrosive atmospheres without compromising dimensional accuracy.
Engineering Compliance and Certification Requirements
Structural hollow sections must conform to EN 1993 (Eurocode 3) or AISC specifications depending on the project region, with material certification verifying that steel grade meets the required yield strength and chemical composition limits. For European markets, CE marking under EN10210/EN10219 is mandatory for structural applications, while North American projects typically require ASTM A500 or A53 compliance with corresponding mill test documentation. Surface treatment selection — bare, oiled, galvanized, or 3PE coated — must align with the project’s corrosion environment and design service life, and custom cutting to specific lengths reduces on-site waste and secondary processing costs [NEED_CITE: steel grade equivalence between EN S275JR and ASTM A53 standards].
Steel Grade Selection and ERW Process Fundamentals
The S-series steel grades (S235JR, S275JR, S355JR) follow the European EN standard system, where the number indicates minimum yield strength in MPa — S275JR delivers 275 MPa yield, making it suitable for general structural frames, while S355JR provides higher load capacity for heavy-duty applications. The J2H and J0H suffixes denote improved impact toughness at -20°C and 0°C respectively, critical for outdoor structures in cold climates. ERW (Electric Resistance Welded) production involves forming steel strip into square or rectangular profile and welding the seam through electrical resistance heating, producing a cost-effective alternative to seamless tube for structural applications where internal pressure is not a primary concern. The hot-rolled process used for thicker wall sections (above 10 mm) ensures uniform grain structure and eliminates residual stresses that can occur in cold-formed sections. Surface treatment options range from bare or oiled finish for indoor applications to hot-dip galvanized coating for outdoor exposure, with 3PE polyethylene coating providing maximum corrosion protection for buried or marine environments.
The Hidden Costs of Incorrect Grade Specification
Ordering S275JR but receiving S235JR due to grade confusion between standards can result in structural members that fail to meet design load requirements, triggering costly re-engineering or complete replacement. Missing mill test certificates prevent verification of chemical composition and mechanical properties, leaving buyers unable to prove compliance during project handover or insurance audits. Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load-bearing capacity and may violate building codes, creating liability exposure for both the buyer and the structural engineer. These issues rarely surface until third-party inspection or site testing, by which point the material is already fabricated, installed, or shipped overseas, making remediation exponentially more expensive than proper upfront verification [NEED_CITE: structural steel procurement quality control and traceability requirements].
Why Procure S275JR ERW Square Steel Tube from XJY Plate
We maintain dedicated production lines for EN10210/EN10219 structural hollow sections, allowing us to supply S275JR ERW square steel tube in sizes from 10×10 mm to 1200×1200 mm with wall thickness up to 50 mm — all from a single source with consistent quality control. Every batch is accompanied by original mill test certificates documenting heat number, chemical composition, and mechanical properties, with full traceability from steelmaking to final inspection. Our in-house理化实验室 verifies dimensional accuracy, weld seam integrity, and surface treatment quality before shipment, while ISO 9001:2015 certification and CE marking ensure compliance with international quality management and European structural standards. For projects requiring third-party verification, we coordinate SGS or BV inspection at our facility, providing independent confirmation of material specifications before container loading. Custom cutting to specific lengths, beveled or threaded ends, and non-standard sizes are available with MOQ as low as 1 Ton, eliminating the need to purchase full-length stock when project designs require precise dimensions. Our logistics team specializes in heavy cargo shipping, with experience in flatbed transport, open-top container loading, and break-bulk arrangements for oversized structural sections, ensuring that S275JR ERW square steel tube arrives at project sites without damage or delay.
Documentation & Compliance
- Mill test certificate documenting S275JR chemical composition, yield strength, and tensile properties per EN10219, with heat number traceability
- CE certificate confirming EN10210/EN10219 compliance for structural hollow sections in European markets
- ISO 9001:2015 quality management system certificate covering production, inspection, and documentation processes
- SGS or BV third-party inspection report available upon request, verifying dimensional accuracy, surface treatment quality, and mechanical properties
- Material traceability documentation linking each batch to specific heat numbers, production dates, and test results
- Export customs documents including packing list, bill of lading, and certificate of origin for international shipment clearance
Packaging, Loading & Delivery
- S275JR ERW square steel tube bundled with steel strips and edge protectors to prevent surface damage during transit, with bundle weight optimized for container or flatbed loading
- Bare or oiled finish tubes wrapped in waterproof paper or plastic film to prevent corrosion during ocean freight, while galvanized tubes receive additional protective wrapping to preserve zinc coating integrity
- Custom cutting to 5.8 m – 14 m lengths reduces on-site waste and allows precise container loading optimization, maximizing payload per shipment
- Heat number and steel grade clearly marked on each tube end with stenciled identification, enabling rapid verification at site inspection
- Professional heavy cargo logistics including flatbed transport for oversized sections (above 600×600 mm), open-top container loading for long lengths, and break-bulk shipping for project quantities
- FOB, CIF, and DDP shipping terms available, with door-to-door delivery coordination to project sites or fabrication workshops worldwide
How to Request a Quotation for S275JR ERW Square Steel Tube
Submit your project specifications including steel grade (S235JR/S275JR/S355JR), section dimensions, wall thickness, length requirements, and total quantity to receive a detailed quotation with material cost, processing fees, and shipping terms within 12 hours. For custom cutting, non-standard sizes, or specific surface treatment requirements, include these details in your inquiry to receive a tailored proposal. We will provide original mill test certificates and CE documentation for your review before contract signing, and coordinate third-party inspection if required for project compliance.
Frequently Asked Questions
Q: What is the difference between S275JR and S355JR steel grades for structural applications?
A: S275JR provides 275 MPa minimum yield strength, suitable for general structural frames and moderate load-bearing applications, while S355JR delivers 355 MPa yield strength for heavy-duty structures requiring higher load capacity. Both grades follow the EN standard system and are produced to EN10210/EN10219 specifications, with S355JR typically selected for larger sections or applications with higher stress requirements.
Q: Can you provide mill test certificates for S275JR ERW square steel tube?
A: Yes, every batch of S275JR ERW square steel tube is supplied with original mill test certificates documenting chemical composition, mechanical properties (yield strength, tensile strength, elongation), and heat number traceability. These certificates conform to EN10219 requirements and are provided before or with shipment for your quality verification and project documentation.
Q: What surface treatment options are available for outdoor structural applications?
A: For outdoor or corrosive environments, we offer hot-dip galvanized coating providing long-term corrosion protection, 3PE polyethylene coating for maximum durability in buried or marine applications, and painted or varnished finish for aesthetic requirements with moderate corrosion protection. Bare or oiled finish is suitable for indoor applications or projects where surface treatment will be applied on-site after fabrication.
Q: What is the minimum order quantity for custom-cut S275JR square steel tube?
A: The minimum order quantity is 1 Ton, whether you require standard stock sizes or custom cutting to specific lengths. We maintain large ready stock in common specifications (10×10 mm to 400×400 mm, wall thickness 1.5 mm – 20 mm) for rapid delivery, while non-standard sizes and large sections (up to 1200×1200 mm, 50 mm wall thickness) are produced to order with typical production lead times.
Q: How do you handle international shipping for heavy structural steel sections?
A: Our logistics team specializes in heavy cargo shipping with experience in flatbed transport for oversized sections, open-top container loading for long lengths (up to 14 m), and break-bulk shipping for large project quantities. We coordinate FOB, CIF, or DDP shipping terms and provide complete export documentation including packing list, bill of lading, and certificate of origin for customs clearance at destination port.
Request S275JR ERW Square Steel Tube Quotation with Mill Test Certificate
Send your specifications including steel grade, section size, wall thickness, length, quantity, and destination port to receive a detailed quotation and original 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
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
