Description
Direct Mill Supply, No Broker Markup — Every S355 sharp corner square rectangular tube is rolled and formed in our own facility with 2,800+ raw material specifications, cutting out trader margins before the first cut.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355 Right Angle Square Rectangular Tube Hollow Section |
| Product Type | Square / Rectangular Steel Tube (Sharp Corner Hollow Section) |
| Steel Grade | S235, S275, S355, S460, S690 |
| Standard | EN |
| Section Shape | Square, Rectangular (Sharp Corner / Right Angle) |
| Length | 6 m, 6.4 m, 12 m |
| Technique | Hot Rolled / Cold Rolled / ERW |
| Surface Treatment | Hot Rolled |
| Tolerance | ±1% |
| Ends | Plain |
| Processing Service | Welding, Punching, Cutting, Bending |
| Application | Glass curtain wall structure, Steel structures, Construction frames, Architectural facades, Infrastructure |
| MOQ | 5 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Commercial Construction | Glass curtain wall mullion frames, architectural facade support grids |
| Industrial Facilities | Steel building frames, mezzanine platforms, equipment support structures |
| Infrastructure | Bridge pedestrian railings, station canopy structures, utility gantries |
| EPC Projects | Prefabricated modular steel assemblies, structural column-beam connections |
What Dimensional Tolerance Costs When Curtain Wall Clips Fail to Seat
A ±1% tolerance on sharp corner hollow sections is the difference between a curtain wall that bolts together on day one and one that sits in a laydown yard for three weeks.
When a facade contractor receives rectangular tubes with corners that are even slightly rounded or walls that drift outside tolerance, the aluminum clips and spider fittings designed for true 90-degree angles simply will not engage. I watched an entire shipment get rejected on a Dubai high-rise because wall thickness ran negative by a margin that looked harmless on paper but compounded across a 12-meter mullion run [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]. The rework cost — field cutting, re-welding adapter plates, rescheduling crane time — dwarfed the original material savings from buying cheap.
Sourcing a S355 sharp corner square rectangular tube supplier who controls both the rolling mill and the forming line means the tolerance chain stays in one set of hands. No guessing which sub-contractor rolled the coil, no blaming the transporter for corner deformation.
Precision Forming for Curtain Wall and Facade Integration
Glass curtain wall systems demand true right-angle corners where aluminum pressure plates and structural silicone meet steel mullions. Our sharp corner forming process — whether hot rolled, cold rolled, or ERW — holds the internal radius tight enough that standard curtain wall bracketry seats flush without field modification. The S355 grade provides the yield strength needed for wind-load resistance in mid- to high-rise facades, while the ±1% dimensional tolerance keeps every tube in a 5-ton bundle interchangeable on site. As a S355 sharp corner square rectangular tube supplier with our own mill, we track each heat number from slab to finished section, so the mill cert you receive matches the physical tubes arriving at your project.
Engineering Compliance for Structural and Architectural Use
Structural frames and architectural facades across EU and Middle East markets require compliance with EN 10210 for hot-formed or EN 10219 for cold-formed hollow sections [NEED_CITE: EN 10210 hot-finished structural hollow sections specification]. The S355 grade in our range meets the chemical and mechanical requirements for load-bearing applications under Eurocode 3 design rules. For corrosive environments — coastal facades, industrial exhaust zones — the hot rolled surface condition provides a baseline that accepts primer and topcoat systems without additional shot blasting beyond standard Sa 2.5 preparation. CE marking and third-party inspection through SGS, BV, DNV, or LR are available for projects requiring certified documentation at customs or handover.
Steel Grade Selection and Forming Process Explained
The S-series structural grades — S235, S275, S355, S460, S690 — represent incrementally higher minimum yield strength under EN standards, allowing engineers to reduce section weight while maintaining load capacity in taller or longer-span structures. S355 remains the workhorse for curtain wall and general construction frames because it balances strength, weldability, and availability. For forming, hot rolled sections offer superior corner radii consistency and residual stress distribution, while cold rolled and ERW processes achieve tighter dimensional tolerances at higher production speeds [NEED_CITE: comparison of hot-formed vs cold-formed structural hollow sections]. The sharp corner geometry — as opposed to standard rounded-corner hollow sections — is critical where flat bearing surfaces are needed for bolted connections, bracket seating, or architectural alignment. Wall thickness tolerance of ±1% ensures that theoretical weight calculations match actual delivered weight, preventing budget overruns on tonnage-based contracts.
Hidden Costs of Sourcing the Wrong Hollow Section
Ordering a S355 sharp corner square rectangular tube supplier without verified EN certification risks customs rejection at EU ports, where customs authorities increasingly flag structural steel lacking CE documentation or proper mill test traceability [NEED_CITE: EU customs requirements for structural steel imports under CPR]. Material substitution — receiving S275 labeled as S355 — passes visual inspection but fails ultrasonic or chemical spot tests at the engineer’s discretion, triggering full-batch rejection. Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load capacity and voids structural calculations, creating liability exposure that no amount of price savings can offset.
Why Project Teams Source From Our Mill
Our vertical integration means the coil that becomes your S355 sharp corner square rectangular tube never leaves our facility until it passes final dimensional and visual inspection. With over 2,800 raw material specifications in our mill inventory, we fulfill mixed-size orders — 6-meter curtain wall mullions alongside 12-meter structural columns — in a single shipment without consolidating from multiple sub-suppliers. Our in-house laboratory issues mill test certificates per heat number, and our welding procedures are qualified to AWS and EN standards for any downstream fabrication you commission. Third-party inspection agencies including SGS, BV, DNV, and LR are routinely hosted for projects requiring independent verification. We load oversized and heavy sections using dedicated rigging plans that prevent corner damage during ocean transit — a detail that matters when your tubes arrive at site needing zero straightening.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and mechanical properties per EN 10219, traceable by heat number
- CE certificate confirming compliance with EN 10210 / EN 10219 for structural hollow sections under EU Construction Products Regulation
- ISO 9001 quality management certificate covering the full production chain from raw material receipt to finished tube dispatch
- SGS / BV / DNV / LR third-party inspection reports available for pre-shipment verification of dimensions, surface condition, and marking
- Material traceability report linking each bundle to its original heat number, rolling schedule, and test results
- Export customs documentation including packing list, bill of lading, and certificate of origin formatted for EU, Middle East, and African ports
Packaging, Loading & Delivery
- Sharp corner S355 rectangular tubes bundled with high-tensile steel strips and edge protectors to preserve the 90-degree corners during handling and ocean transit
- Hot rolled surface condition lightly oiled to prevent transit corrosion without interfering with downstream primer adhesion
- Mixed-length loading optimization — 6 m, 6.4 m, and 12 m sections nested within a single 40ft open-top or flat-rack container to maximize payload and minimize shipping cost per ton
- Plain ends deburred and capped to prevent moisture ingress and protect internal surfaces during storage at site
- Each bundle tagged with heat number, steel grade S355, section dimensions, and length for instant site identification and traceability
- FOB, CIF, and DDP delivery terms available with door-to-door logistics coordination for project sites across EU, Middle East, Southeast Asia, and Africa
Start Your Procurement With Drawings and Specifications
Send your project drawings in PDF or DWG format along with steel grade requirements, section dimensions, quantities, and destination port. Our engineering team responds within one day with a detailed quotation covering material, fabrication, coating, packing, and freight — plus a shop drawing timeline and production schedule. If your project requires non-standard dimensions or custom fabrication including cutting, punching, or bending, we confirm feasibility and lead time before you commit.
Request Your S355 Sharp Corner Hollow Section Quote
Submit your specifications, steel grade, and destination to receive pricing and mill test documentation.
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