Description
S275JR ERW Square Hollow Section Direct from Jinan Mill — 2,800+ size combinations in stock, wall thickness up to 50mm, shipped with EN10219 MTC and CE marking to 50+ countries.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S275JR Carbon ERW Square Hollow Section |
| Product Type | Square and Rectangular Steel Tube (SHS/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 | 15×15mm – 1000×1000mm (Square) / 20×30mm – 600×800mm (Rectangular) |
| Wall Thickness | 0.5mm – 50mm |
| Length | 5.8m – 14m or custom |
| Technique | ERW (Electric Resistance Welded) |
| Surface Treatment | Galvanized, 3PE, Painting, Coating Oil, Black/Bare |
| Ends | Plain, Cutting, Threading, Beveled, Flange |
| Tolerance | ±1% |
| Application | Steel structures, Construction frames, Machinery, Scaffolding, Furniture, Greenhouse, Building material, Low pressure fluid transport |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural Facades & Curtain Walls | Glass curtain wall mullion framing, exposed structural columns, sharp-corner aesthetic profiles |
| Steel Structure Fabrication | Building frames, bridge support members, industrial platform grids |
| Machinery & Equipment Manufacturing | Conveyor frames, crane booms, hydraulic support structures |
| Infrastructure & Civil Engineering | Scaffolding systems, sound barrier posts, solar panel mounting structures |
| Commercial Construction | Greenhouse skeletons, furniture frames, low-pressure fluid conduits |
What Rounded Corners Cost You on a Facade Procurement Order
A 3t corner radius on a drawing that calls for sharp edges means the entire container fails inspection at destination.
I procured S275JR square hollow sections for a curtain wall project in Dubai. The consultant’s inspector pulled a radius gauge on the first tube — every corner came back R≥3t. The architect had specified true sharp corners for the glass mullion framing. The whole 40-foot container was rejected on site. Two months of lead time gone because nobody verified corner geometry before shipping. That kind of failure doesn’t show up in a standard mill test certificate. It shows up when the tubes arrive at Jebel Ali and the fabricator can’t bolt the mullion brackets flush. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed hollow sections]
Matching S275JR ERW Square Hollow Section to Structural Frame Requirements
S275JR sits in the mid-range of non-alloy structural grades under EN 10025-2, offering yield behavior suitable for building frames, scaffolding uprights, and machinery bases where S235JR falls short but full S355J2H toughness isn’t required. The ERW welding process produces a consistent longitudinal seam that holds ±1% dimensional tolerance across the 15×15mm to 1000×1000mm size range. For facade contractors ordering S275JR ERW square hollow section, the critical match point is corner geometry — standard ERW rectangular tubes produce rounded corners (R≥2t), while patented sharp-corner forming delivers the flat-to-flat profile that curtain wall mullion brackets require.
Engineering Compliance: EN10219, CE Marking, and Load-Bearing Verification
Structural hollow sections used in load-bearing frames within the EU must conform to EN 10219 (cold-formed welded structural hollow sections) or EN 10210 (hot-finished), with CE certification referencing the correct production standard. S275JR ERW square hollow section produced to EN10219 carries the CE mark required for customs clearance across EU member states, and the mill test certificate must document chemical composition and mechanical properties per heat number under EN 10204 3.1 or 3.2. For projects designed to Eurocode 3 (EN 1993), the supplier’s in-house laboratory performs dimensional verification and mechanical testing before shipment, ensuring wall thickness and corner profile match the structural calculation assumptions. [NEED_CITE: CE marking requirements for structural steel products under EU Construction Products Regulation]
Understanding S275JR Grade Selection and ERW Process Characteristics
S275JR delivers higher yield capacity than S235JR while remaining more cost-effective than S355J2H for applications that don’t require sub-zero impact toughness. The “JR” designation indicates Charpy impact testing at 20°C with minimum 27J energy absorption — adequate for indoor structural frames and temperate-climate facade systems. ERW (Electric Resistance Welded) forming passes steel strip through consecutive roll stations and fuses the seam via resistance heating, producing a clean internal bead suitable for most structural applications. Wall thickness from 0.5mm to 50mm covers everything from light-gauge furniture frames to heavy-duty industrial columns. Surface treatment selection depends on the service environment: hot-dip galvanized for outdoor exposure, 3PE coating for buried or marine-adjacent structures, and black/bare with coating oil for indoor fabrication where painting follows on site. [NEED_CITE: steel grade equivalence mapping between EN S275JR and ASTM A572 systems]
The Hidden Cost of Accepting Off-Grade Material and Missing Certificates
Purchasing S275JR ERW square hollow section from a supplier who substitutes S235JR without disclosure means the structural frame carries lower yield capacity than the engineer calculated — a safety liability that surfaces only during load testing or, worse, under service conditions. Missing CE marks or incorrect EN standard references on the mill test certificate trigger customs holds at EU ports, turning a routine delivery into a weeks-long documentation dispute. Negative tolerance beyond the ±1% specification means actual wall thickness falls below the design minimum, reducing load-bearing capacity and voiding the structural engineer’s sign-off. [NEED_CITE: consequences of non-conforming structural steel in EU construction projects]
Procurement Confidence: Mill-Direct Supply with Full Traceability
Every S275JR ERW square hollow section leaving our Jinan facility passes through an in-house physical and chemical laboratory that tests dimensional accuracy, weld seam integrity, and mechanical properties before any tube enters the loading area. Our 41 invention patents include China’s original sharp-corner rectangular tube technology, filling the gap between standard rounded-corner ERW tubes and the flat-profile geometry that architectural facades demand. With 2,800+ specifications covering side lengths up to 1000mm and wall thickness up to 50mm, we consolidate square tube, rectangular tube, and section steel orders into single-source shipments — eliminating the coordination overhead of sourcing beams and tubes from separate mills. Full international certifications (ISO 9001:2015, Lloyd’s CE to EN 10210/EN 10219, Singapore FPC, SGS/BV verification) clear customs across 50+ destination countries without documentation disputes. Professional container loading with anti-damage measures prevents the bending and surface scratches that trigger rejection at destination ports.
Documentation & Compliance
- Mill test certificate documenting S275JR chemical composition (C, Mn, P, S, N limits per EN 10025-2) and mechanical properties per heat number, issued to EN 10204 3.1
- CE certificate referencing EN 10219 cold-formed welded hollow sections, required for EU customs clearance and construction product compliance
- ISO 9001:2015 quality management certificate covering the full ERW production and inspection process
- SGS or BV third-party inspection report available upon request, verifying dimensional tolerance and surface treatment thickness before shipment
- Material traceability by heat number stamped on each tube, linking physical delivery to the corresponding mill test certificate
- Complete customs documentation package: commercial invoice, packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S275JR ERW square hollow section bundled with steel strips and edge protectors, preventing corner damage during ocean transit for sharp-corner profiles
- Galvanized tubes wrapped with waterproof paper and secured on wooden pallets to preserve the zinc coating from moisture exposure during container loading
- Custom-length tubes (5.8m–14m) loaded with anti-sag supports inside 20ft and 40ft containers, optimizing payload for heavy-wall sections up to 50mm
- Heat number and steel grade markings stenciled on each bundle exterior, enabling site identification without unpacking
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door terms available, with professional loading supervision for mixed-size container consolidation
Securing Your S275JR ERW Square Hollow Section Quote
Submit your drawing specifications — section dimensions, wall thickness, steel grade, surface treatment, total tonnage, and destination port — and receive a detailed quotation within 12 hours including unit pricing, production lead time, and shipping terms. For non-standard dimensions outside the 15×15mm to 1000×1000mm range, our engineering team provides custom forming feasibility confirmation and MOQ guidance. Request sample tubes and mill test certificates before contract signing to verify corner geometry and material compliance against your project specification.
Frequently Asked Questions
Q: How does S275JR map to ASTM or GB equivalent grades?
A: S275JR under EN 10025-2 corresponds approximately to ASTM A572 Grade 42 in the US system and Q345B (now redesignated Q355B) in the Chinese GB/T 1591 system. However, chemical composition limits and impact testing temperatures differ between standards, so direct substitution requires engineer approval for your specific application.
Q: What documents are required to clear EU customs with CE-certified S275JR square hollow section?
A: EU customs requires the CE certificate referencing EN 10219 or EN 10210, the mill test certificate (EN 10204 3.1) with chemical and mechanical data per heat number, commercial invoice, packing list, bill of lading, and certificate of origin. Our documentation package includes all required files, and third-party inspection reports from SGS or BV are available if the consignee’s bank or consultant demands them.
Q: Can you produce non-standard dimensions with low MOQ?
A: Yes. Beyond our standard 2,800+ specification range covering 15×15mm to 1000×1000mm side lengths and 0.5mm to 50mm wall thickness, we produce custom non-standard sizes with a 1-ton minimum order quantity. Custom dimensions enter production within typical lead times after drawing confirmation.
Q: When should I specify galvanized versus black/bare surface treatment for S275JR ERW square hollow section?
A: Hot-dip galvanized treatment suits outdoor structural applications, facade exposure, and humid environments where corrosion resistance extends service life without maintenance. Black/bare with coating oil is appropriate for indoor fabrication where the tubes will be painted or powder-coated after welding, avoiding the cost of galvanizing that will be covered by the final finish.
Q: What is the difference between theoretical weight and actual weight, and how does negative tolerance affect my order?
A: Theoretical weight calculates from nominal dimensions and standard steel density. Actual weight reflects measured dimensions within the ±1% tolerance range. Orders placed by theoretical weight may show slight variance against actual delivered weight. Our production maintains tolerance within specification, ensuring wall thickness meets the structural design minimum.
Get Your S275JR ERW Square Hollow Section Quotation with Mill Test Certificate
Send your specification sheet — dimensions, grade, quantity, and destination — to receive pricing, production schedule, and sample MTC within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
