Description
Factory-direct pricing, zero middlemen markup — every S355 right angle square rectangular tube rolls off our own EN-compliant production lines, shipped with full mill documentation straight to your project site.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355 Right Angle Square Rectangular Tube |
| Product Type | Square / Rectangular Steel Tube (Hollow Section) |
| Steel Grade | S235, S275, S355, S460, S690 (HSLA); Weathering Steel |
| Standard | EN 10210 / 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, Heavy-Duty Structural Engineering, Outdoor Infrastructure |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Glass curtain wall structural frames, facade mullion systems |
| Construction | Steel building frames, industrial platform supports |
| Infrastructure | Bridge railings, highway sound barrier structures |
| Machinery | Conveyor system frames, heavy equipment bases |
What Sharp-Corner Tolerance Costs on a Curtain Wall Frame Order
A 0.5 mm deviation in corner radius means entire facade panels must be re-fabricated on site.
I learned this the hard way on a Middle East glass curtain wall project years ago — we shipped standard R-radius tubes against a drawing that explicitly called for sharp-corner geometry. The龙骨 joints didn’t align, and the entire container went back for rework. Since then, every right angle square rectangular tube leaving our facility is checked corner by corner. For EPC contractors sourcing a S355 right angle square rectangular tube supplier, the real risk isn’t just dimensional inaccuracy — it’s missing CE documentation that holds cargo at EU ports, or inconsistent wall thickness that fails ultrasonic inspection upon arrival. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Precision Geometry for Curtain Wall Structural Joints
The right angle profile eliminates gaps at mullion-to-transom connections, allowing flush welding and clean silicone sealing without filler plates. Our sharp-corner forming technology holds uniform wall thickness through the corner zone — a common failure point in conventional roll-forming where thinning compromises load transfer. When facade engineers specify a S355 right angle square rectangular tube supplier, they need corners that stay at 90° within ±1% tolerance across 12-meter lengths, not just sample pieces.
Structural Compliance and Corrosion Considerations
EN 10219 governs cold-formed welded structural hollow sections, and CE marking under this standard is mandatory for load-bearing applications in EU member states. [NEED_CITE: CE marking requirements for structural steel under EU Construction Products Regulation] For outdoor infrastructure exposed to industrial or marine atmospheres, weathering steel grades within the S355 family develop a stable rust patina that eliminates painting cycles. Hot-rolled surface finish provides better coating adhesion if post-treatment is specified, while the non-oiled condition avoids contamination during on-site welding.
Steel Grade Selection and Forming Process
S355 delivers higher yield strength than S235 or S275, making it the default choice for curtain wall frames where self-weight and wind load demand stiffer sections without increasing wall thickness. The HSLA range extends to S460 and S690 for heavy-duty industrial platforms where weight reduction matters. ERW welding produces a clean longitudinal seam with consistent mechanical properties, while hot-rolled processing ensures smooth surface quality suitable for exposed architectural applications. The ±1% dimensional tolerance across all sections means theoretical weight invoicing remains predictable — no surprise cost overruns from overweight deliveries. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards]
Hidden Costs of Unverified Procurement
Ordering from traders without mill test certificates means discovering material non-conformance only after cutting begins — wrong chemistry fails welding procedure qualification, and missing CE marks trigger customs holds that delay project timelines by weeks. Negative tolerance abuse inflates theoretical weight invoices while delivering under-spec walls that fail structural verification. [NEED_CITE: consequences of missing mill test certificates in international steel procurement]
Why Engineers Specify Our Hollow Sections
Our in-house physical and chemical laboratory tests every heat before release, issuing EN 10204 3.1 certificates with full traceability. The sharp-corner rectangular tube technology — holding 41 patents — solves the exact geometry problem that causes curtain wall misalignment. With 2,800+ specifications across square, rectangular, and round sections, we consolidate fragmented procurement into single-source delivery. Lloyd’s Register EU CE certification under EN 10210/10219 clears customs without documentation disputes, while SGS and BV third-party inspections provide independent verification before shipment. Professional loading plans optimize container utilization for 6-meter and 12-meter lengths, reducing freight cost per ton.
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 10210 and EN 10219 for structural hollow sections
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report available upon request before container sealing
- Material traceability documentation linking each bundle to specific heat numbers and production batches
- Complete customs package including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot-rolled S355 tubes bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Non-oiled surface condition requires moisture barrier wrapping for extended sea freight to prevent flash rust
- 6-meter and 12-meter lengths optimized for 20ft and 40ft open-top container loading plans
- Heat number stenciled on each tube end for on-site material verification and traceability
- FOB, CIF, and DDP shipping terms available with real-time tracking to 50+ countries
- Custom cutting to project-specific lengths available before shipment to reduce on-site waste
Ready to Verify Specifications and Pricing
Submit your drawing specifications with section dimensions, steel grade requirements, quantity, and destination port. We return detailed quotations including unit pricing, production timelines, and applicable certification documentation within 12 hours. Request non-standard sharp-corner dimensions or custom lengths — our technical team confirms feasibility and tooling requirements before contract finalization.
Frequently Asked Questions
Q: How does S355 compare to ASTM A500 Grade C or Q345B?
A: S355 under EN 10219 provides equivalent or higher yield strength than ASTM A500 Grade C and Chinese Q345B. We supply mill test certificates showing actual chemistry and mechanical properties for direct comparison.
Q: What certifications accompany shipments to EU countries?
A: Every shipment includes CE marking documentation per EN 10210/10219, EN 10204 3.1 mill test certificates, and complete customs documentation. Lloyd’s Register certification ensures acceptance by EU inspectors.
Q: Can you produce non-standard sharp-corner dimensions below typical MOQ?
A: Yes. Our 2,800+ specification range includes custom non-standard sizes. For specialized sharp-corner profiles, we evaluate tooling requirements and confirm feasibility with reduced MOQ options for project-specific orders.
Q: How is invoicing calculated — theoretical or actual weight?
A: We invoice by theoretical weight based on EN standard density calculations with ±1% dimensional tolerance. Mill test certificates confirm actual measurements fall within tolerance range.
Q: What production lead time applies and which shipping terms are available?
A: Standard production timelines apply once deposit is received. We offer FOB, CIF, and DDP terms with professional loading optimization and real-time shipment tracking to major ports worldwide.
Secure Your S355 Right Angle Square Rectangular Tube Supply
Send specifications via email or WhatsApp for immediate quotation with full certification package.
Mobile/WhatsApp: +86 188 5315 7756 | Email: admin@sdxjysteel.com
