S355JR Sharp Corner Square Rectangular Steel Tube EN10210 Factory Direct Supplier

Description

Factory-Direct Sharp Corner SHS/RHS — 3 production lines running EN10210/EN10219 sharp corner square and rectangular tubes with S235JR through S355J2H grades, shipped with original mill test certificates to 50+ countries.

Technical Specifications

Application Suitability

Where 90-Degree Corner Tolerance Decides Site Assembly Fit

Sharp corner square and rectangular tubes that miss ±1% side-length tolerance force welders to grind, re-fit, or scrap entire joints on site.

I have seen containers of sharp corner tubes arrive at a Middle East job site where the R-angle on the corner was anything but sharp — the forming die wore out halfway through the run, and what should have been a clean 90-degree internal corner came out rounded. The fabricator could not get the gusset plates to sit flush. Two weeks of rework, argon gas wasted, and the project engineer pointing at the mill test certificate asking why nobody caught it during production. When you source a S355JR sharp corner square steel tube supplier without in-house dimensional inspection at every stage, that corner tolerance drifts silently into your container. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]

Matching Sharp Corner SHS/RHS to Structural Frame Connections

The 90-degree sharp corner on these EN10219 tubes exists for one reason: to eliminate gaps at welded or bolted joints. When an EPC contractor frames a portal structure using S355JR sharp corner square steel tube sections, the beam-to-column connection plate bears directly against a flat, true-angle surface — no filler welding to close a rounded corner gap. Our forming process holds the internal R-radius tight enough that gusset plates and end-plates seat without grinding, which matters when you are running 500 tonnes through a steel structure yard on a fixed erection schedule. The same sharp corner geometry serves machinery OEMs building conveyor bases where equipment mounting rails must align within millimeter tolerances across multiple tube joints.

Engineering Compliance and Certification Pathways

Structural engineers specifying EN 10219 cold-formed hollow sections expect full traceability from heat number to finished tube. The S355JR and S355J2H grades in this product line carry CE marking under EN10210 and EN10219, which is the compliance gateway for European market projects and for any destination that recognizes CE as proof of conformity. For buyers in regions that follow ASTM or local equivalents, the same production line can supply A53 GR.B, A36, or Q460 grades — but the certification package must match the specified standard, not the shipped standard. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards] Surface treatment selection also ties to engineering specs: bare or oiled tubes suit indoor structural frames where painting follows on site, while galvanized or 3PE-coated sharp corner tubes go directly into greenhouse structures or coastal infrastructure where corrosion protection cannot wait for a secondary coating step.

Steel Grade Selection and Forming Process Fundamentals

The S-series grades — S235JR, S275JR, S355JR, S355J2H, S355J0H — represent incrementally higher minimum yield strength under the EN standard system, meaning a structural designer can reduce wall thickness and weight by stepping from S235JR to S355JR while maintaining the same load-bearing capacity. The J2H suffix adds Charpy impact testing at lower temperatures, which matters for structures in cold climates or dynamic loading environments. Our ERW process forms the sharp corner by passing pre-cut strip through a series of forming rolls that progressively bend the material into a true 90-degree angle before the high-frequency welding seam closes on the flat face — this keeps the weld away from the high-stress corner zone. Hot-rolled variants serve thicker wall requirements above the practical forming limit of cold-rolled strip. Surface treatment choice follows the service environment: galvanized coating protects outdoor scaffolding and greenhouse frames, while painted or varnished finishes suit indoor architectural applications where appearance matters alongside corrosion resistance. [NEED_CITE: cold forming process effect on corner mechanical properties in EN 10219]

Hidden Costs When Corner Tolerance and Certification Fail

A S355JR sharp corner square steel tube supplier who lets wall thickness drift into negative tolerance beyond the EN 10219 allowance saves steel cost at the mill but transfers the loss to your project. The structural engineer calculates load capacity based on nominal dimensions — when actual wall thickness falls below the tolerance floor, the tube fails the验收 test and the entire batch gets rejected. Missing or incomplete mill test certificates trigger customs holds at destination ports, and without CE documentation under EN10210/EN10219, European projects cannot pass the conformity inspection. The real cost is not the tube price difference — it is the crane standing idle, the welders sent home, and the re-procurement lead time that pushes the project past its deadline. [NEED_CITE: EN 10219 tolerance class requirements for structural hollow sections]

Why Project Buyers Source Sharp Corner SHS/RHS Through Xin Jiyuan

We run three production lines simultaneously in Jinan, producing over 20,000 tons monthly across square, rectangular, and round sections — which means your S355JR sharp corner square steel tube order does not wait behind someone else’s queue. Every heat of steel entering our line gets tested in our in-house laboratory before forming begins, and every finished batch ships with an original mill test certificate showing chemical composition and mechanical properties against EN10219 requirements. Our inventory covers 2,800+ specifications in standard sizes for immediate dispatch, while custom sharp corner dimensions and non-standard lengths run through dedicated forming setups with typical production lead times. Third-party inspection through SGS or BV is available on request for buyers who need independent verification before container sealing. We handle the full export documentation package — commercial invoice, packing list, bill of lading, certificate of origin — and our loading team optimizes container stowage to maximize weight utilization for heavy-wall sharp corner tubes.

Documentation & Compliance

• Mill test certificate documenting S355JR / S355J2H chemical composition and mechanical properties per EN10219, issued per heat number
• CE certificate covering EN10210 hot-finished and EN10219 cold-formed structural hollow sections for European market compliance
• ISO 9001:2015 quality management system certificate covering full production and inspection process
• SGS or BV third-party inspection report available upon request, covering dimensional check, visual inspection, and witness testing
• Material traceability from heat number through forming, welding, and final inspection for each shipped bundle
• Full customs document package including packing list, bill of lading, and certificate of origin for destination clearance

Packaging, Loading & Delivery

• S355JR sharp corner tubes bundled with high-tensile steel strips and edge protectors to preserve the 90-degree corner geometry during ocean transit
• Galvanized sharp corner SHS/RHS packed with waterproof wrapping and separated by rubber spacers to prevent zinc coating damage from friction
• Bare or oiled tubes bundled in seaworthy packages with clear heat number and steel grade markings stenciled on each bundle for site identification
• Container loading optimized for 5.8m and 12m lengths with wooden cradles at bearing points to prevent sharp corner deformation under stacking weight
• Custom cut lengths bundled separately with marked tags indicating exact piece length and end treatment (plain, beveled, or threaded)
• FOB Jinan/Qingdao port or CIF destination port arrangements with real-time tracking and full export documentation support

Getting Your Sharp Corner SHS/RHS Quote Started

Send your specification sheet covering section size, wall thickness, steel grade, total tonnage, and destination port — we return a detailed quotation with volume-based pricing, production timeline, and certification package details within 12 hours. For non-standard sharp corner dimensions or custom lengths outside the 5.8m–14m range, share your drawing and we confirm forming feasibility and tooling requirements. If your project requires SGS/BV third-party inspection or specific CE documentation for European customs, flag it at inquiry stage so we include it in the contract.

Frequently Asked Questions

Q: What is the difference between EN10210 and EN10219 for sharp corner square tubes?

A: EN10210 covers hot-finished welded structural hollow sections formed at high temperature, while EN10219 covers cold-formed welded structural hollow sections formed at ambient temperature through roll forming. Both standards apply to sharp corner SHS/RHS, but the forming method affects corner mechanical properties and tolerance classes — cold-formed tubes under EN10219 typically offer tighter dimensional tolerance on corner angles.

Q: Can you provide mill test certificates and third-party inspection for customs clearance?

A: Yes. Every batch of S355JR sharp corner square steel tube ships with an original mill test certificate per EN 10204 3.1, documenting chemical composition and mechanical properties by heat number. SGS or BV third-party inspection is available on request for pre-shipment dimensional verification, visual inspection, and witness testing — the inspection report is accepted by customs authorities in most destination countries.

Q: What is the MOQ for non-standard sharp corner sizes and custom lengths?

A: The minimum order quantity is 1 ton, which applies to both standard catalog sizes and custom sharp corner dimensions. For non-standard section sizes outside our regular forming range, we evaluate the drawing and confirm whether existing tooling can accommodate the request or whether a dedicated forming setup is required.

Q: How do you ensure 90-degree sharp corner accuracy and dimensional tolerance?

A: Our three-stage inspection process checks dimensions at raw material stage, during forming, and after welding. The sharp corner forming dies are inspected and replaced on a scheduled cycle to prevent R-angle drift. Final dimensional check verifies side length, wall thickness, and corner angle against EN10219 tolerance requirements before the bundle receives its heat number marking.

Q: What surface treatment options are available for outdoor versus indoor applications?

A: For outdoor and corrosive environments — coastal construction, greenhouse structures, infrastructure projects — we supply hot-dip galvanized sharp corner tubes with full zinc coating coverage. For indoor structural frames, machinery bases, and furniture applications, bare, oiled, painted, or varnished finishes are available. 3PE coating serves buried or highly aggressive soil conditions.

Request Your S355JR Sharp Corner SHS/RHS Quotation

Submit your section size, wall thickness, steel grade, quantity, and destination port to receive factory-direct pricing with mill test certificate and CE documentation included.

Shandong Xin Jiyuan Special Steel Tube Co., Ltd

Website: www.sdxinjiyuan.com

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