Description
Full-Range Sharp-Corner Tube Supply — 2,800+ specifications covering S355JR sharp corner square steel tube side lengths from 15×15 mm to 1000×1000 mm with wall thickness up to 50 mm, all from a single certified source.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR / S355J2H / S355J0 Square and Rectangular Steel Tube |
| Product Type | Square and Rectangular Steel Tube (Sharp-Corner / 90 Degree) |
| Steel Grade | S235JR, S275JR, S355JR, S355J0, S355J2H, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219 |
| 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 custom |
| Technique | Hot Rolled Carbon Steel Welded (ERW) |
| Surface Treatment | Galvanized, 3PE, Painting, Coating Oil, Bare, Steel Stamp |
| Ends | Plain, Cutting, Threading, Beveled, Flange |
| Tolerance | ±1% |
| Corner Feature | Sharp corner 90 degree |
| Application | Steel structures, urban/civil construction, machine structure, agriculture equipment, water and gas pipeline, greenhouse, scaffolding, building material, furniture, low pressure fluid transport |
| MOQ | 1 Ton |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural Facade & Curtain Wall | Glass curtain wall framing, building exterior steel skeleton, decorative structural columns |
| Steel Structure Fabrication | Building frames, bridge support members, industrial platform structures |
| Machinery Manufacturing | Equipment base frames, conveyor structures, hydraulic support columns |
| Infrastructure & Civil Engineering | Scaffolding systems, pipeline support racks, water and gas transmission structures |
| Agriculture & Greenhouse | Greenhouse skeleton framing, irrigation support structures |
Why Standard Rectangular Tubes Fail on Facade Projects
Rounded corners (R≥2t) on conventional tubes create visible gaps at junction points, forcing fabricators to fill, grind, and repaint — adding cost and delaying handover.
When specifying a S355JR sharp corner square steel tube for architectural curtain wall systems, the corner radius directly affects how cleanly two members meet at a joint. Standard cold-formed rectangular tubes produced under generic processes leave a visible radiused corner that cannot sit flush against a flat plate or adjacent member. The result is an aesthetic defect on exposed facades and a structural gap that requires filler welding or machining to close. Sourcing true 90-degree sharp-corner tubes with valid EN10219 certification from a single qualified supplier eliminates both the visual defect and the documentation gap that blocks EU customs clearance. [NEED_CITE: EN 10219 cold-formed welded structural hollow sections dimensional tolerance requirements]
Matching Sharp-Corner Geometry to Structural Connection Requirements
A S355JR sharp corner square steel tube with true 90-degree corners allows direct bearing contact between intersecting members without additional gusset plates or filler material. For curtain wall framing and exposed architectural steelwork, this means clean sightlines and reduced welding time at joints. Our patented sharp-corner forming process produces right-angle corners across the full range from 15×15 mm to 1000×1000 mm, covering over 2,800 size combinations — so non-standard facade dimensions do not require switching suppliers or accepting rounded-corner compromises.
Engineering Compliance and Certification Pathway
Structural hollow sections used in load-bearing frames must conform to dimensional and mechanical requirements under EN 10219 for cold-formed welded tubes or EN 10210 for hot-finished profiles. When shipping S355JR sharp corner square steel tube to EU markets, the CE mark referencing EN 10210 or EN 10219 is mandatory for customs clearance — generic mill certificates without the correct standard reference will be rejected at the port. For projects in North America, ASTM A500 Grade B/C equivalence must be documented separately. Our in-house physical and chemical laboratory tests every heat for dimensional accuracy, yield behavior, and chemical composition before release, and third-party inspection through SGS or BV is arranged on request. [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 10219]
Steel Grade Selection and Corner Forming Technology
S355JR provides a minimum yield strength level suited to general structural framing and architectural applications in moderate climate zones, while S355J2H extends impact toughness to sub-zero conditions for cold-region projects. The ERW welding process used for these tubes offers cost efficiency at medium wall thicknesses while maintaining dimensional consistency across long production runs. The sharp-corner forming technology — holding 41 invention patents — displaces the conventional rounded-corner die method, producing true right angles that meet both aesthetic requirements for facades and tight-tolerance needs for machinery frames. Surface treatment selection depends on the service environment: galvanized coating for outdoor exposure, 3PE for buried or submerged conditions, and painted or oiled finishes for indoor or temporary protection. Wall thickness tolerance of ±1% ensures that theoretical weight calculations align with delivered mass, avoiding unexpected shortfalls on tonnage-based contracts. [NEED_CITE: steel grade equivalence between EN S355 series and ASTM A500 grades]
Hidden Costs of Incorrect Grade or Certification on Structural Orders
Ordering S355JR sharp corner square steel tube without verifying the EN10219 certificate reference may seem like a documentation formality — until the shipment reaches EU customs and gets held for missing or incorrect CE marking. Material substitution — receiving S235JR when S355JR was specified — passes visual inspection but fails structural load verification on site, triggering rework, replacement shipments, and project delays. Negative tolerance abuse on wall thickness reduces actual load capacity below design calculations, creating safety liability that surfaces only during final engineering inspection. [NEED_CITE: consequences of non-conforming structural steel in construction projects]
Procurement Confidence Through Verified Capability
Every S355JR sharp corner square steel tube order ships from our own three production lines in Jinan, covering 2,800+ specifications with wall thickness up to 50 mm — no trading company markup or specification handoff. Our in-house laboratory issues mill test certificates documenting chemical composition and mechanical properties per heat number, backed by Lloyd’s CE certification under EN 10210/EN 10219, ISO 9001:2015 registration, and Singapore FPC approval. The patented sharp-corner technology fills a market gap that standard tube mills cannot address, giving facade contractors and steel structure fabricators access to true 90-degree corners in non-standard sizes with low minimum order quantities. Professional container loading with anti-damage bracing prevents the bending and surface scoring that cause rejection at destination — a lesson learned from early export shipments where improper stowage led to full container claims. Exports to 50+ countries confirm that our documentation package clears customs consistently across EU, Middle East, Southeast Asian, and American ports.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and mechanical properties per EN10219, traceable by heat number
- CE certificate issued under EN10210 / EN10219 for structural hollow sections, required for EU market import
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report available upon request before shipment release
- Material traceability sheet linking each bundle to heat number, test results, and dimensional records
- Full customs documentation package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S355JR sharp corner square steel tubes bundled with high-tensile steel strips and edge protectors to preserve corner geometry during transit
- Galvanized finish tubes wrapped with waterproof paper and plastic film to prevent white rust formation during ocean shipping
- Container loading optimized by length grouping (5.8 m or 14 m) to maximize payload and prevent shifting during sea freight
- Custom cutting to project-specific lengths available, with cut ends deburred and marked with heat number and steel grade
- Each bundle labeled with steel grade S355JR, size specification, heat number, and purchase order reference for site identification
- Shipping terms available as FOB, CIF, or DDP with professional tube loading plans to prevent bending damage at destination
Start Your Procurement With Verified Specifications
Submit your required dimensions, steel grade, surface treatment preference, quantity, and destination port to receive a detailed quotation with unit pricing, production lead time, and applicable shipping terms within 12 hours. Mill test certificates and product samples are available for quality confirmation before contract signing, and third-party inspection can be arranged at our facility.
Request Your S355JR Sharp Corner Square Steel Tube Quotation
Send your specifications to receive pricing, mill test certificates, and delivery terms.
Company: 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
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: What is the difference between S355JR and S355J2H for sharp corner square steel tube applications?
A: S355JR is specified for general structural use at ambient temperatures with impact testing at 20°C, while S355J2H extends impact toughness to -20°C, making it suitable for cold climate projects. Both grades are available in our sharp-corner forming process across the full size range.
Q: Can non-standard sizes be produced for sharp corner rectangular tubes?
A: Yes. Our production lines cover over 2,800 specifications from 15×15 mm to 1000×1000 mm square and 20×30 mm to 600×800 mm rectangular, with wall thickness from 0.5 mm to 50 mm. Custom non-standard sizes are available with low MOQ requirements.
Q: What certifications are provided for EU market import?
A: We supply CE certification under EN10210 and EN10219, ISO 9001:2015 quality certificate, Singapore FPC approval, and mill test certificates per heat number. Third-party inspection through SGS or BV is available before shipment.
Q: How are sharp corner tubes packed to prevent damage during shipping?
A: Tubes are bundled with steel strips and edge protectors to maintain corner geometry. Galvanized tubes receive additional waterproof wrapping. Professional container loading plans with anti-damage bracing are standard for all export orders.
Q: What surface treatment options are available?
A: Options include galvanized coating for outdoor corrosion protection, 3PE for buried or submerged service, painting for specific color requirements, coating oil for temporary protection, and bare or steel stamp finish for indoor applications.
Request Your S355JR Sharp Corner Square Steel Tube Quotation Today
Submit your project specifications including dimensions, steel grade, surface treatment, and destination port to receive a detailed quotation with mill test certificates and delivery terms.
Company: 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
