Description
Factory-Direct S355 Hollow Sections — Every S355 right angle square rectangular tube is rolled on our own production lines in Jinan, eliminating trader markups and ensuring full traceability from billet to finished section.
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 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 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 | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Glass curtain wall structural frameworks, facade support grids, atrium roof trusses |
| Heavy Structural Engineering | Portal frames, column sections, load-bearing bracing in industrial buildings |
| Infrastructure | Highway sound barrier posts, pedestrian bridge handrails, lighting pole bases |
| Outdoor Structural Projects | Solar panel mounting structures, equipment support platforms in corrosive environments |
What Wall-Thickness Tolerance Costs on a S355 Right Angle Square Rectangular Tube Order
A ±1% tolerance on wall thickness is the difference between passing structural inspection and scrapping an entire curtain wall frame batch.
I once watched a Middle East glass curtain wall project stall at acceptance because the supplier let wall thickness drift beyond allowable negative tolerance. The engineer on site pulled a caliper, measured three random pieces, and rejected the lot. That single oversight cost weeks of delay and a full re-shipment. On a S355 right angle square rectangular tube destined for structural frames, even minor thickness deviation changes the load-bearing calculation and weld penetration depth. When your project specifies EN 10219, the tolerance band is not a suggestion — it is the compliance boundary. [NEED_CITE: EN 10219 dimensional tolerance requirements for cold-formed structural hollow sections]
How Sharp-Corner Geometry Meets Curtain Wall Connection Demands
A glass curtain wall transfers wind load and dead load through tube-to-tube connections that must sit flush. The S355 right angle square rectangular tube with precision-formed sharp corners provides flat bearing surfaces that eliminate gap-filling shims at moment connections. Our forming process maintains corner radius within tight limits across all wall thicknesses, so milled end-plates and welded gussets land squarely without secondary grinding. For projects spanning 6 m to 12 m lengths, this consistency holds along the full member — not just at the sample ends.
Structural Compliance and Certification Pathways for EN Standard Hollow Sections
Engineering specifications for curtain wall and heavy structural frames typically reference EN 1993-1-1 for steel design, which assumes material properties conforming to EN 10219 or EN 10210. The S355 right angle square rectangular tube we produce carries CE marking under these standards, meaning the declared mechanical properties and dimensional tolerances have been verified by a notified body. For EU-bound shipments, this CE certificate is not optional — customs authorities in member states require it for structural steel imports. [NEED_CITE: CE marking requirements for structural steel under EN 10210 and EN 10219] Weathering steel grades in our range add atmospheric corrosion resistance for outdoor infrastructure where maintenance access is limited.
Steel Grade Selection and Forming Process Explained
The S-series grading system (S235, S275, S355, S460, S690) indicates minimum yield strength in MPa — S355 delivers higher load capacity than S235 in the same cross-section, allowing designers to reduce member size and save weight. For curtain wall frames where self-weight matters, S355 often hits the optimal balance between strength and formability. Our ERW and hot rolled processes produce the sharp-corner profile through successive forming stands that gradually bend the flat strip into the final shape, minimizing residual stress at the corners. The non-oiled hot rolled surface arrives clean and ready for painting or galvanizing without degreasing. Welding performance across S235 through S460 grades remains predictable with standard MIG/MAG procedures, while S690 HSLA requires pre-heat controls that our technical team documents per heat number. [NEED_CITE: weldability considerations for high-strength structural steel grades S355 to S690]
Hidden Costs of Specifying the Wrong Grade or Accepting Unverified Tolerances
Choosing S235 when the structural engineer calculated for S355 means the member deflects beyond serviceability limits — the fix is not a discount, it is a full replacement. Accepting tubes with unverified negative tolerance shifts the risk to your project: the section modulus drops, the connection bolts bear on thinner material, and the building inspector flags it. Certification gaps create a different cost — a container of S355 right angle square rectangular tube without proper CE documentation sits at EU port until paperwork is resolved, accumulating demurrage daily. Material traceability failures mean you cannot prove which heat produced which member, turning a routine audit into a forensic exercise. [NEED_CITE: consequences of non-compliant structural steel in EU construction projects]
Why Procurement Teams Source S355 Hollow Sections Directly from Our Jinan Mill
We run three production lines simultaneously, giving us the capacity to fulfill bulk orders of S355 right angle square rectangular tube without queuing behind other customers. Our in-house metallurgical lab tests every heat for chemical composition and mechanical properties before the tube leaves the line — the mill test certificate you receive reflects actual data, not typical values. For projects requiring multiple section sizes, we consolidate from our 2,800+ specification inventory into single containers, reducing your per-ton freight cost. Every batch carries CE certification under EN 10210 and EN 10219, and we arrange SGS or BV third-party inspection at our facility before loading, so your surveyor does not need to fly in. Our export team handles the full documentation stack and optimizes container loading plans for 6 m, 6.4 m, and 12 m lengths to maximize payload per shipment.
Documentation & Compliance
- Mill test certificate documenting S355 chemical composition (C, Mn, Si, P, S) and yield/tensile strength per EN 10219, issued per heat number
- CE certificate of conformity confirming EN 10210 hot-finished or EN 10219 cold-formed hollow section compliance for EU customs clearance
- ISO 9001:2015 quality management certificate covering our full production and inspection process
- SGS or BV third-party inspection report available on request, covering dimensional checks, surface quality, and witness testing
- Material traceability sheet linking each bundle to its heat number, production date, and test results
- Complete customs document set: commercial invoice, packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- S355 right angle square rectangular tubes bundled with high-tensile steel strips at intervals preventing bundle separation during crane handling
- Non-oiled hot rolled surface protected by tight bundling and edge guards to prevent corner damage and surface scoring during transit
- Container loading plan optimized for 6 m, 6.4 m, and 12 m lengths to maximize 20ft and 40ft payload, with weight distribution calculated per shipping standard
- Custom cut-to-length service available for 12 m stock, reducing on-site waste and cutting labor for curtain wall frame fabrication
- Each bundle tagged with heat number, steel grade S355, section dimensions, and length for immediate site identification
- FOB, CIF, and DDP terms available with door-to-door coordination for project sites requiring direct delivery
Getting Your S355 Right Angle Square Rectangular Tube Quote Started
Send your section dimensions, wall thickness, steel grade, total tonnage, and destination port — we return a detailed quotation with volume pricing, production lead time, and certification inclusions within hours. If your project requires non-standard sizes or sharp-corner profiles outside typical catalogs, our engineering team reviews the drawing and confirms feasibility before you commit. We provide sample sections and original mill test certificates for your quality verification before contract signing.
Frequently Asked Questions
Q: What is the difference between EN 10219 and EN 10210 for S355 rectangular hollow sections?
A: EN 10219 covers cold-formed welded structural hollow sections produced at ambient temperature, while EN 10210 covers hot-finished welded structural hollow sections formed at elevated temperature. The production method affects residual stress distribution and corner mechanical properties. We produce S355 right angle square rectangular tube to both standards depending on your project specification.
Q: Can you supply S355 right angle square rectangular tube with non-standard dimensions?
A: Yes. Beyond our standard size range, we produce custom rectangular and square sections to your drawing specifications. Minimum order quantities apply for non-standard profiles, and we provide feasibility confirmation with dimensional drawings before production begins.
Q: What certifications do you provide for EU customs clearance?
A: Every S355 right angle square rectangular tube shipment includes CE certification under EN 10210 or EN 10219, mill test certificates per heat number, and ISO 9001:2015 quality system certification. These documents satisfy EU construction product regulation requirements for structural steel imports.
Q: How is invoicing calculated — theoretical weight or actual weight?
A: We invoice by theoretical weight based on the section dimensions, wall thickness, and length specified in your order. The ±1% tolerance applies to actual production dimensions, and our mill test certificate documents the measured values for your records.
Q: What surface treatment options are available for S355 hollow sections?
A: Our standard delivery condition is hot rolled with a smooth, non-oiled surface suitable for immediate painting or further coating. For projects requiring additional corrosion protection, we coordinate galvanizing or custom coating as a secondary processing service.
Secure Your S355 Right Angle Square Rectangular Tube Supply
Submit your specifications, steel grade, and quantity to receive a factory-direct quotation with full certification documentation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
