Description
Factory-direct S275JR square steel tube — Vertically integrated steel mill and fabrication facility controlling quality from raw slab to finished EN10210 hollow section under one roof.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S275JR ERW Square Steel Tube |
| Product Type | Square and Rectangular Steel Tube (SHS/RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J2H, S355J0, S355JO, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219 |
| Section Shape | Square / Rectangular |
| Size Range | 10×10mm – 1200×1200mm (Square); 15×15mm – 1000×1000mm / 20×30mm – 600×800mm (Rectangular) |
| Wall Thickness | 0.5mm – 50mm |
| Length | 5.8m – 14m or as per order |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Galvanized / 3PE / Varnish |
| Tolerance | ±1% |
| Ends | Plain / Cut / Threaded / Beveled / Flanged |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Greenhouse / Urban & civil construction / Water and gas pipeline / Low pressure fluid transport |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Construction | Building frames, warehouse columns, logistics center roof trusses |
| Machinery & Equipment | Conveyor structures, crane booms, equipment support frames |
| Scaffolding & Access | Scaffold towers, temporary access platforms, shoring systems |
| Urban Infrastructure | Street light poles, greenhouse frames, low-pressure fluid pipelines |
| EPC Projects | Steel structure modules, pipe rack supports, platform grating frames |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
A S275JR square steel tube that fails dimensional inspection on site means the entire batch gets rejected — regardless of how competitive the price was.
Early in my career, a warehouse project in Dubai received a container of S275JR rectangular tubes where the wall thickness ran consistently below the negative tolerance limit. The third-party inspector flagged every single piece. The cargo sat at Jebel Ali for weeks while the buyer scrambled for replacements. That kind of failure does not come from bad intentions — it comes from fragmented supply chains where the fabricator has no control over the mill that produced the raw material. When you source a S275JR square steel tube from a vertically integrated facility, the same quality system that rolls the steel also verifies every dimensional check before shipment. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How S275JR Square Steel Tube Matches Structural Frame Requirements
Structural frames for industrial buildings and warehouses demand consistent yield strength across every column and beam connection. The S275JR square steel tube delivers the balance between weldability and load-bearing capacity that general contractors specify for medium-rise steel frames. Our ERW process produces sharp, uniform corners that sit flush against gusset plates and moment connections — a detail that matters when your erection team is bolting up hundreds of joints per day. The 2,800+ specification range in our inventory means project managers can source both primary frame members and secondary bracing tubes from a single purchase order, with matching heat numbers across the entire bill of materials.
Engineering Compliance and Certification for International Projects
Structural hollow sections destined for European markets must conform to EN 10210 for hot-finished or EN 10219 for cold-formed processes, with CE marking mandatory for load-bearing applications. The S275JR grade falls within the EN 10025-2 non-alloy structural steel family, and its chemical composition and mechanical properties are verified through EN 10204 3.1 or 3.2 certification depending on the project specification. For projects in the Middle East and Southeast Asia, the same S275JR square steel tube can be supplied with third-party inspection from SGS or BV at any production stage, ensuring that the mill test certificate matches the physical cargo. Surface treatment selection — whether bare with shop primer, hot-dip galvanized, or 3PE coated — is determined by the corrosion environment and the design life specified by the structural engineer. [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 1090]
Steel Grade Selection and ERW Process Fundamentals
The S-series structural grades (S235JR, S275JR, S355JR, S355J2H) follow the European EN 10025 naming convention where the number indicates minimum yield strength in MPa for thicknesses up to 16mm. S275JR sits in the middle of this range — offering higher strength than S235JR for weight optimization, while remaining more economical and easier to weld than S355JR for non-critical applications. The “JR” designation confirms Charpy impact toughness at room temperature (27 Joules at 20°C), making it suitable for indoor and moderate outdoor structural use. Our ERW (Electric Resistance Welded) process forms the tube from hot-rolled coil through continuous forming and high-frequency resistance welding, producing a clean weld seam without filler metal. For wall thicknesses above standard cold-formed limits, hot-rolled ERW achieves up to 50mm walls — covering heavy-load applications in industrial platforms and bridge supports. The ±1% dimensional tolerance applies across the full size range from 10×10mm small sections to 1200×1200mm large-box members. [NEED_CITE: steel grade equivalence between EN 10025 S-series and ASTM A572/A36]
Hidden Costs of Procuring the Wrong Grade or Unverified Material
Ordering S275JR but receiving S235JR material — or accepting tubes with wall thickness below the specified tolerance — creates cascading failures that no price discount can offset. Structural engineers calculate member sizes based on certified yield strength; substituting a lower grade compromises the safety factor and may require complete redesign. Missing or forged mill test certificates trigger customs holds in markets with strict import controls, particularly the EU where EN 1090 compliance is enforced at the border. Rework costs from dimensional non-conformance — re-cutting, re-welding, re-coating — routinely exceed the original material cost by multiples. [NEED_CITE: consequences of non-compliant structural steel in international construction projects]
Why Project Teams Source S275JR Square Steel Tube From Our Facility
Our steel production facility operates three rolling lines with direct control over slab quality, reheating, and finishing — meaning the S275JR square steel tube you receive carries full traceability back to the original heat. The in-house metallurgical laboratory performs chemical analysis and mechanical testing on every heat before release, producing EN 10204 3.1 certificates that travel with the cargo. With over 2,800 specifications maintained in inventory, project teams can consolidate orders across multiple steel grades and section sizes without splitting purchases among several suppliers. Our fabrication division handles CNC cutting, drilling, welding, and surface treatment — so a warehouse frame order arrives on site with connection plates already welded and shop-primed. Every shipment includes a complete documentation package: WPS records, dimensional inspection reports, coating thickness measurements, and packing lists with heat-number traceability. Professional loading teams plan container stowage for oversized sections, minimizing transit damage and reducing the number of shipments needed.
Documentation & Compliance
- Mill Test Certificate documenting S275JR chemical composition (C, Mn, Si, P, S) and mechanical properties (yield strength, tensile strength, elongation) per EN 10025-2 and EN 10219
- CE Certificate confirming EN 10210/EN 10219 compliance for structural hollow sections destined for European Union markets
- ISO 9001 Quality Management System certificate covering the full production process from raw material incoming inspection to final shipment
- SGS / BV / TÜV third-party inspection report available at any production stage — raw material, in-process welding, dimensional check, or pre-shipment
- Material traceability by heat number etched on each tube, cross-referenced to the mill test certificate and packing list
- Customs documentation package including commercial invoice, packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S275JR square steel tubes bundled with galvanized steel strips at intervals matched to section size, with edge protectors preventing coating damage during transit
- Bare tubes oiled with rust-preventive compound; galvanized tubes wrapped with waterproof paper at both ends to preserve zinc coating integrity during ocean freight
- Container loading plans optimized for 5.8m and 12m standard lengths, with nested smaller sections filling void spaces to maximize payload per shipment
- Custom cut-to-length service available for project-specific dimensions within the 5.8m–14m range, with kerf allowance calculated per order
- Heat number and steel grade stenciled on each tube end, with bundle tags showing section size, wall thickness, length, and total piece count
- FOB, CIF, and DDP shipping terms available with door-to-door logistics coordination for project sites across the Middle East, Southeast Asia, Africa, and Europe
How to Request a Quotation for Your Project
Submit your project drawings (PDF or DWG format) along with the required steel grade, section dimensions, wall thickness, total quantity, and destination port. Our engineering team reviews the specification within 24 hours and returns a detailed quotation covering material cost, fabrication scope, surface treatment, packing, and freight — with a production schedule and shop drawing timeline included. For non-standard dimensions or custom connection details, we provide fabrication sequencing advice and material optimization recommendations before the contract is signed.
Get Your S275JR Square Steel Tube Quote With Full Mill Certification
Send your project specifications to receive a detailed quotation and EN 10204 mill test certificate sample 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
Frequently Asked Questions
Q: How does S275JR compare to ASTM A572 Grade 50 or A36 in structural applications?
A: S275JR (EN 10025-2) has a minimum yield strength of 275 MPa for thicknesses up to 16mm, which places it between ASTM A36 (250 MPa yield) and ASTM A572 Grade 50 (345 MPa yield). For European-spec projects, S275JR is the standard choice; for projects requiring ASTM equivalence, our team provides cross-reference documentation and can supply material tested to dual standards where the chemistry and mechanical properties satisfy both specifications.
Q: Can you provide EN 10204 3.2 third-party certificates for European Union projects?
A: Yes. EN 10204 3.2 certification requires independent third-party verification (such as SGS, BV, or TÜV) witnessing the testing and signing the certificate alongside the manufacturer. We arrange third-party inspection at any agreed production stage — from raw material testing through final dimensional and visual inspection — and the 3.2 certificate is issued before shipment.
Q: What is the minimum order quantity for non-standard dimensions outside your regular stock range?
A: The standard MOQ is 1 Ton for stock sizes. For non-standard dimensions requiring custom rolling or forming, the minimum depends on the section size and wall thickness — typically a single production campaign of 5 to 20 tons. We provide exact MOQ confirmation after reviewing the specific dimensions and total project quantity.
Q: When should I specify hot-dip galvanized versus 3PE coating for outdoor structural use?
A: Hot-dip galvanizing provides a zinc-iron alloy layer suitable for atmospheric corrosion protection with a typical design life of 20–50 years depending on the environment category (C3 to C5 per ISO 12944). 3PE (three-layer polyethylene) coating is specified for buried or submerged applications where the tube contacts soil or water directly. For most outdoor structural frames in moderate environments, hot-dip galvanized is the standard choice; for aggressive industrial or marine atmospheres, a duplex system (galvanized plus powder coat) may be recommended.
Q: Do you bill by theoretical weight or actual weighment?
A: For standard EN 10210 and EN 10219 hollow sections, billing is based on theoretical weight calculated from the specified outer dimensions, wall thickness, and length using the standard steel density of 7.85 kg/dm³. The ±1% dimensional tolerance is applied per the standard, and no deduction is made for tolerance within the specified range. For project-specific requirements where actual weighment is preferred, we can arrange weighbridge certification at the loading port.
