Description
Full-Range Sharp-Corner Stock — 2,800+ specifications in S235–S690 grades ship from factory inventory with EN 10219 / EN 10210 compliance documentation.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355 Right Angle Square Rectangular Tube |
| Product Type | Square / Rectangular Steel Tube (Sharp-Corner Hollow Section) |
| Steel Grade | S235, S275, S355, S460, S690 (HSLA); Weathering Steel; Mild Steel |
| Standard | EN 10219 / EN 10210 |
| Section Shape | Square, Rectangular |
| Length | 6 m / 6.4 m / 12 m |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Hot Rolled (Smooth, Non-oiled) |
| Tolerance | ±1% |
| Processing Service | Welding, Punching, Cutting, Bending |
| Invoicing | By Theoretical Weight |
| Application | Glass curtain wall structure, architectural facades, heavy-duty structural engineering, outdoor infrastructure, marine/offshore structures |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural Facade & Curtain Wall | Structural framing for glass curtain wall systems, exposed steel mullions, right-angle corner joints in building envelopes |
| Heavy-Duty Structural Engineering | Column and beam connections in high-rise steel frames, load-bearing trusses, transfer girders |
| Outdoor Infrastructure | Bridge handrail posts, lighting pole bases, highway sound barrier frames |
| Marine & Offshore | Platform support structures, corrosion-resistant walkway frames, offshore equipment skids |
Where Rounded Corners Fail on a Glass Curtain Wall
A right angle square rectangular tube for glass curtain wall must deliver true 90° edges — standard hollow sections with R≥2t corners create visible gaps at mullion intersections and compromise facade alignment.
Early in my career I coordinated a glass curtain wall project in Dubai. The rectangular tubes we sourced locally had corner radii that looked acceptable on the mill certificate but, once bolted together on-site, the rounded edges left uneven seams across the entire facade grid. An entire container was rejected and shipped back for rework. That single incident reshaped how I evaluate every tube order — corner geometry is not a cosmetic detail, it is a structural and aesthetic requirement. Procurement teams often discover this only after materials arrive at the job site, when re-cutting or replacing sharp-corner sections triggers delays and cost overruns. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed hollow sections]
Matching Structural Geometry to Facade Engineering
A right angle square rectangular tube for glass curtain wall systems must align precisely with glazing channel depths and mullion connection plates. The sharp-corner forming process produces edges that sit flush against adjacent members without filler shims, reducing on-site adjustment time. For S355 grade sections used in mid- to high-rise curtain wall frames, the combination of true right-angle geometry and ±1% dimensional tolerance ensures that bolt-hole patterns drilled at the fabrication shop match field conditions. Weathering steel variants extend this advantage to exposed exterior structures where corrosion allowance and visual patina matter.
Engineering Compliance and Certification Pathways
Structural hollow sections destined for European markets must conform to EN 10219 (cold-formed) or EN 10210 (hot-formed) requirements, with CE marking validated through factory production control audits. [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 10219] For projects in the Middle East and Southeast Asia, third-party inspection by SGS or BV before shipment resolves customs and consultant approval bottlenecks. The S355 grade specified here meets yield and tensile criteria under EN standards, while equivalent ordering against ASTM A500 Gr. B/C or GB Q355 requires careful cross-referencing to avoid material substitution disputes during inspection. [NEED_CITE: steel grade equivalence mapping between EN S355 and ASTM A500]
Steel Grade Selection and Sharp-Corner Forming Technology
S235 serves light structural and non-load-bearing facade elements where formability takes priority. S355 remains the default for curtain wall main frames and building structural tubes, balancing weldability with higher yield capacity. S460 and S690 HSLA grades address heavy-duty applications — transfer girders, long-span trusses, and offshore support frames — where weight reduction and load capacity are critical. The sharp-corner forming technology behind this right angle square rectangular tube for glass curtain wall uses a patented multi-pass rolling process that achieves true 90° internal corners without cracking or excessive thinning at the bend zone. This process covers wall thicknesses up to 40 mm across 2,800+ section specifications, a range that eliminates the need to source standard tubes from one supplier and specialty sharp-corner sections from another. Hot rolled surface finish delivers a smooth, non-oiled profile suitable for direct painting or powder coating in architectural applications.
Hidden Costs of Incorrect Tube Procurement
Ordering standard rectangular tubes when the design calls for sharp-corner sections leads to facade rework, consultant rejection, and potential structural review delays. Missing or incorrect CE documentation under EN 10219 can hold shipments at EU ports for weeks. [NEED_CITE: customs clearance requirements for structural steel imports into European Union] Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load capacity and triggers failure during third-party inspection. Material substitution without proper grade equivalence documentation creates liability exposure for both the contractor and the building owner.
Why Procurement Teams Consolidate Orders Here
Factory-direct pricing eliminates trading company margins on every ton of S355 right angle square rectangular tube for glass curtain wall projects. An in-house physical and chemical laboratory issues mill test certificates covering chemical composition and mechanical properties per heat number, removing dependence on external testing labs. The patented sharp-corner technology — backed by 41 invention patents — fills a gap that most domestic and international mills cannot address, meaning facade contractors source both standard and specialty sections from a single production base. Full CE certification under EN 10210 and EN 10219, ISO 9001:2015 registration, and Singapore FPC approval clear regulatory requirements across EU, Middle Eastern, and Southeast Asian markets. Custom non-standard sizes and lengths are available with a 5-ton minimum order, accommodating small-batch facade remediation work alongside large structural contracts. Professional container loading plans prevent tube bending and surface damage during ocean transit — a detail that matters when 12-meter S355 sections must arrive straight and scratch-free.
Documentation & Compliance
- Mill test certificate documenting S355 chemical composition and mechanical properties per EN 10219, traceable by heat number
- CE certificate confirming compliance with EN 10219 (cold-formed) and EN 10210 (hot-formed) structural hollow section requirements
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report available upon request for pre-shipment quality verification
- Material traceability records linking each bundle to its heat number, chemical analysis, and test results
- Complete customs documentation set including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot rolled S355 square and rectangular tubes bundled with steel strips, separated by rubber pads to preserve the smooth non-oiled surface during ocean transit
- Sharp-corner sections loaded in dedicated container bays with timber chocking to prevent edge damage and maintain 90° corner geometry
- 6 m and 12 m lengths optimized for 20ft and 40ft open-top container configurations, maximizing payload while protecting tube ends
- Heat number and S355 grade stenciled on each bundle for site identification and inspection traceability
- Pre-shipment loading photographs provided for buyer approval before container sealing
- FOB, CIF, and DDP shipping terms available with full export documentation support
Request a Quotation with Mill Test Documentation
Submit your section dimensions, S355 or alternative grade requirement, tonnage, and destination port to receive a detailed quotation including unit pricing, production lead time, and shipping terms. Mill test certificates and CE documentation are confirmed at the quotation stage so compliance is verified before any deposit is placed.
Get Your S355 Sharp-Corner Tube Quote
Send your specifications to receive pricing and material certification within 12 hours.
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 a sharp-corner rectangular tube and a standard rectangular tube?
A: Standard rectangular tubes produced under conventional forming methods have rounded internal corners with radii typically equal to or greater than twice the wall thickness. Sharp-corner rectangular tubes use a patented multi-pass forming process that produces true 90° internal angles, eliminating visible gaps at connection points and delivering cleaner facade lines for glass curtain wall applications.
Q: How do EN S355 and ASTM A500 grades compare for curtain wall structural use?
A: EN S355 and ASTM A500 Gr. C share similar yield strength ranges, but the chemical composition and testing requirements differ. Orders for European projects should specify EN 10219 or EN 10210 to ensure CE compliance, while North American projects typically require ASTM A500 documentation. Grade equivalence confirmation is provided with the mill test certificate.
Q: Can non-standard sizes be ordered with a low minimum quantity?
A: Custom non-standard section sizes are available with a 5-ton minimum order. The production facility covers over 2,800 specifications with wall thicknesses up to 40 mm, allowing facade contractors to consolidate standard and specialty sections into a single order.
Q: What certification documents are provided for EU customs clearance?
A: Each shipment includes a CE certificate under EN 10219 or EN 10210, mill test certificates with chemical and mechanical data per heat number, and complete customs documentation. Third-party inspection reports from SGS or BV are available upon request for projects requiring independent verification.
Q: How is theoretical weight invoicing calculated?
A: Invoicing by theoretical weight uses the nominal dimensions and standard steel density to calculate the weight per meter. The ±1% dimensional tolerance ensures that actual weight remains close to theoretical calculations, providing cost predictability for project budgeting.
Order S355 Right Angle Square Rectangular Tube for Your Next Curtain Wall Project
Submit your section sizes, grade, and quantity to receive a quotation with mill test certificate confirmation within 12 hours.
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
