Description
Precision-Formed Sharp Corner Sections — S355 rectangular hollow sections engineered to EN 10219 tolerances for glass curtain wall frameworks, backed by original mill test certificates and CE marking.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355 Right Angle Square Rectangular Tube Hollow Section |
| Product Type | Sharp Corner Square / Rectangular Hollow Section |
| Steel Grade | S235, S275, S355, S460, S690 |
| Standard | EN 10219 |
| Section Shape | Square, Rectangular |
| Length | 6 m, 6.4 m, 12 m |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Hot Rolled (Smooth surface, Non-oiled) |
| Tolerance | ±1% |
| Processing Service | Welding, Punching, Cutting, Bending |
| Invoicing | By Theoretical Weight |
| Packing | Standard Seaworthy Packing |
| Application | Glass Curtain Wall Structure / Steel Structures / Construction Frames / Heavy-Duty Structural Engineering / Outdoor Infrastructure |
| MOQ | 5 Tons |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Facade Engineering | Glass curtain wall mullions, transoms, and perimeter framing systems |
| Commercial Construction | Steel building frames, mezzanine structures, column supports |
| Infrastructure | Bridge walkway railings, highway sound barrier frameworks |
| Heavy-Duty Structural | Industrial platform grids, crane runway beams, equipment support frames |
| Outdoor Infrastructure | Lighting pole bases, signage gantries, solar mounting structures |
What Wall-Thickness Tolerance Costs on a Curtain Wall Frame Order
A 0.4 mm deviation in wall thickness can shift corner joint alignment enough to reject an entire facade bay.
Structural steel buyers sourcing S355 sharp corner square rectangular tube supplier products for curtain wall systems routinely encounter thickness inconsistencies that cascade into fabrication rework. When negative tolerance practices go unchecked, mullion-to-transom connections fail to seat properly, bolt holes misalign, and on-site crews spend hours grinding or re-drilling before glass panels can be installed. Missing or unverifiable mill test certificates compound the problem—without heat number traceability, project engineers cannot confirm whether the delivered material actually meets EN 10219 mechanical requirements, leaving structural liability unresolved. [NEED_CITE: EN 10219 cold-formed hollow section requirements]
How Sharp Corner Geometry Matches Curtain Wall Connection Details
Glass curtain wall systems demand right-angle external corners that align flush with architectural sightlines. Cold-formed sharp corner rectangular hollow sections produced under EN 10219 maintain tight external corner radii, allowing direct bolted or welded connections to cast aluminum brackets without filler plates. The S355 sharp corner square rectangular tube supplier inventory we hold in 6 m and 12 m lengths matches standard curtain wall bay heights, reducing on-site cutting waste. Each batch undergoes dimensional inspection before dispatch, with corner radius and flatness verified against drawing tolerances.
Structural Compliance and Certification Pathways
Curtain wall framing in European markets must conform to EN 1993-1-1 design rules, which reference EN 10219 for cold-formed welded hollow sections. The S355 grade delivers the yield strength class required for mid-rise facade loading while remaining weldable without preheat under typical site conditions. For projects targeting CE marking under the Construction Products Regulation, documentation must demonstrate conformity to EN 10219-1 technical delivery conditions and EN 10219-2 dimensional tolerances. [NEED_CITE: CE marking requirements for structural steel hollow sections] Steel grade equivalence between EN 10219 S355 and ASTM A500 Grade C often arises in mixed-standard projects—chemical composition and mechanical property comparisons must be documented before substitution is approved by the structural engineer.
Steel Grade Selection and Forming Process Fundamentals
The S-series steel grades (S235 through S690) follow EN 10025 designation logic, where the number indicates minimum yield strength in MPa for thickness ≤ 16 mm. S355 remains the default choice for curtain wall structures because it balances load capacity with formability—higher grades like S460 and S690 serve heavy-duty industrial frames where weight reduction matters. The ERW (Electric Resistance Welding) process used for these hollow sections produces a longitudinal seam with heat-affected zone properties controlled to match the parent metal, ensuring uniform behavior under bending loads. Sharp corner forming requires specialized roll passes that compress the outer radius to near-zero while maintaining wall thickness at the corner—this is where ±1% tolerance control separates reliable suppliers from those producing oval or bulging corners. Hot-rolled surface finish without oiling provides a clean base for direct painting or powder coating, avoiding the adhesion failures that occur when residual rolling oil contaminates the surface.
Hidden Costs of Unverified Material Procurement
Procuring sharp corner hollow sections without certified traceability exposes projects to rejection at structural inspection, customs holds due to missing CE documentation, and costly teardown when as-built dimensions deviate from engineered connections. Material substitution—receiving S275 labeled as S355—reduces load capacity below design assumptions, creating latent safety risk that only surfaces under extreme loading or during forensic audit. Negative tolerance abuse inflates theoretical weight invoicing while delivering under-spec material, shifting cost to the buyer who pays for steel that was never delivered. [NEED_CITE: consequences of negative tolerance abuse in structural steel supply]
Why Project Teams Source S355 Sharp Corner Sections Through XJY Plate
Our plate and coil division operates within Shandong Xin Jiyuan Special Steel Tube Co., Ltd, which maintains dedicated sharp corner forming lines producing rectangular hollow sections to EN 10219 dimensional tolerances. Every heat is tested in our in-house laboratory, and original mill test certificates documenting chemical composition and mechanical properties travel with each shipment. We stock S235 through S690 grades across common curtain wall section sizes, enabling single-source procurement that eliminates multi-supplier coordination delays. Custom cutting to project-specific lengths—6 m, 6.4 m, or 12 m—reduces on-site waste and accelerates installation sequences. CE certification under EN 10210 and EN 10219, ISO 9001:2015 quality management, and availability of SGS or BV third-party inspection satisfy European and Middle Eastern procurement compliance requirements. Professional heavy-cargo loading using flatbed trailers and open-top containers prevents transit damage to sharp corner geometry, with loading plans optimized for 20-foot and 40-foot container weight limits.
Documentation & Compliance
- Mill test certificate documenting S355 chemical composition (C, Mn, Si, P, S) and yield strength per EN 10219-1 for each heat number
- CE certificate confirming EN 10219 conformity for structural hollow sections destined for European Economic Area construction projects
- ISO 9001:2015 quality management system certificate covering cold-formed welded hollow section production
- SGS or BV third-party inspection report available upon request for pre-shipment dimensional and visual verification
- Full material traceability linking each bundle to its heat number, rolling date, and test certificate
- Export customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S355 sharp corner rectangular tubes bundled with high-tensile steel strips at intervals preventing bundle shift during ocean transit
- Hot-rolled non-oiled surface protected by edge guards and waterproof wrapping to prevent corner damage and moisture staining
- 6 m and 12 m lengths loaded into open-top containers or flatbed trailers using overhead cranes to avoid scraping sharp corners
- Custom cut-to-length service available for 6.4 m curtain wall bay heights, eliminating on-site cutting and reducing scrap
- Each bundle labeled with heat number, steel grade (S355), section dimensions, and bundle weight for site identification
- FOB, CIF, and DDP shipping terms available with professional heavy-cargo logistics coordination to port or project site
How to Initiate Procurement for Your Curtain Wall Project
Submit your section dimensions, steel grade requirement (S235 through S690), total tonnage, and destination port to receive a detailed quotation including material cost, processing fees, and shipping terms within 12 hours. We will provide the original mill test certificate for your quality verification before shipment and coordinate third-party inspection if your project specification requires it.
Request Your S355 Sharp Corner Section Quotation
Send your specification sheet to admin@xjyplate.com or contact us via WhatsApp at +86 188 5315 7756 to confirm availability, pricing, and delivery timeline for your glass curtain wall structure project.
