Description
Full-Range Sharp Corner SHS/RHS Stock — S355JR sharp corner square and rectangular steel tube in 15×15 mm to 1000×1000 mm, wall thickness 0.5–50 mm, shipped with original mill test certificates and EN10219 compliance documentation.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR S355J2H Sharp Corner Square and Rectangular Steel Tube |
| Product Type | Sharp Corner Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J0, S355J2H, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219 |
| Section Shape | Square / Rectangular (90° sharp corners) |
| Size Range | 15×15 mm – 1000×1000 mm (square); 20×30 mm – 600×800 mm (rectangular) |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m (or custom cut-to-length) |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Galvanized / 3PE / Varnish |
| Ends | Plain / Cut / Beveled / Threaded / Flanged |
| Tolerance | ±1% |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Greenhouse / Low pressure fluid transport / Building material |
| MOQ | 1 Ton |
| Origin | China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Structural Steel Fabrication | Column frames, roof trusses, portal frames requiring 90° sharp corner joints |
| Construction & Infrastructure | Scaffolding systems, high-rise building skeletons, bridge support members |
| Machinery & Equipment | Heavy equipment chassis, agricultural machinery frames, industrial work platforms |
| Furniture & Interior | Display racks, shelving systems, modern architectural exposed frames |
| Greenhouse & Agriculture | Structural support frames, gutter support channels |
What Corner Radius Tolerance Costs on a Structural Frame Order
A 3 mm corner radius deviation means field rework on every beam-to-column connection.
When sourcing S355JR sharp corner square and rectangular steel tube, fabricators regularly encounter inconsistent inner radii from different mills. The result: gaps at welded joints that require filler metal compensation, misaligned bolt holes on moment connections, and visible unevenness on architecturally exposed frames. On a recent Manila warehouse project I supervised, a container of rectangular hollow sections arrived with corner radii varying between 2 mm and 8 mm across the same batch — the structural frames failed load testing and the entire shipment sat at port for weeks while replacement material was sourced. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
Beyond fabrication delays, poor corner control creates hidden costs in painting and fireproofing. Irregular surfaces trap moisture at sharp internal transitions, accelerating coating breakdown. Inspectors flag these areas during final acceptance, forcing abrasive blasting and recoating at the contractor’s expense.
How Sharp Corner Geometry Matches Structural Connection Requirements
The 90° sharp corner profile of S355JR sharp corner square and rectangular steel tube directly addresses the fitting precision demanded by modern steel construction. Unlike standard rounded-corner RHS where gusset plates require shimming, sharp corners provide full bearing contact at moment connections and base plate interfaces. Our cold-forming process maintains inner radius control within tight tolerance across the full 15×15 mm to 1000×1000 mm range, ensuring that cut-to-length sections arrive at site ready for direct welding or bolting without secondary machining.
Engineering Compliance and Certification Requirements
Structural hollow sections supplied under EN10219 must meet the dimensional tolerance classes specified for cold-formed welded products, with particular attention to corner radius consistency and flatness of side walls. For projects governed by Eurocode 3 (EN 1993-1-1), the steel grade designation — whether S235JR for light framing or S355J2H for low-temperature structural work — determines the design strength values engineers use in load calculations. CE certification under the Construction Products Regulation is mandatory for structural steel entering EU markets, while projects in North America typically require ASTM A500 or A53 equivalence documentation. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards]
Steel Grade Selection and Forming Process Fundamentals
The S-series structural steels (S235JR through S355J2H) follow a designation system where the number indicates minimum yield strength in MPa, while the suffix denotes impact test temperature requirements — JR for +20°C, J0 for 0°C, J2 for -20°C. This matters for S355JR sharp corner square and rectangular steel tube because the forming process introduces residual stresses at corner zones; specifying the correct sub-grade ensures adequate toughness at the intended service temperature. ERW (Electric Resistance Welded) production creates a longitudinal weld seam with mechanical properties matched to the parent material through post-weld heat treatment, while hot-rolled options eliminate the weld seam entirely for applications requiring uniform properties around the full perimeter. Surface treatment selection — bare with shop primer, hot-dip galvanized, or 3PE coating — depends on the exposure environment: indoor structural frames typically receive bare or painted finish, while outdoor infrastructure and marine-adjacent construction demand galvanized or 3PE protection.
Hidden Costs of Incorrect Material Specification
Ordering S235JR when the structural design calls for S355JR means the sections arrive with lower yield strength than calculated — the engineer’s safety factors cannot compensate for this fundamental mismatch. Similarly, accepting material without verifiable mill test certificates creates traceability gaps that surface during project handover: building inspectors request heat number verification against the original MTC, and missing documentation triggers costly delays or complete material rejection. Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load-bearing capacity while the invoiced weight suggests compliance. [NEED_CITE: consequences of negative tolerance in structural steel hollow sections]
Procurement Advantages at XJY Plate
Every S355JR sharp corner square and rectangular steel tube leaving our facility carries an original mill test certificate documenting chemical composition, mechanical properties, and heat number traceability — not a template document, but the actual test record from the producing mill. Our dedicated plate and coil division maintains ready stock across the full size range from 15×15 mm to 1000×1000 mm, eliminating the minimum order constraints that force smaller fabricators to purchase full-length bundles. Custom cutting to exact project lengths, combined with our flatbed and open-top container loading expertise, ensures that heavy sections arrive without corner damage or transit deformation. ISO 9001:2015 and CE certification, plus SGS/BV third-party inspection availability, provide the documentation chain that satisfies both project engineers and customs authorities.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN10219, with heat number traceability to the original slab
- CE certificate confirming compliance with EN10210 and EN10219 for structural hollow sections entering European markets
- ISO 9001:2015 quality management certificate covering the complete production and inspection process
- SGS or BV third-party inspection report available upon request for projects requiring independent verification
- Material traceability documentation linking each piece to its heat number, chemical analysis, and mechanical test results
- Export customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Sharp corner S355JR sections bundled with steel strips and edge protectors to preserve 90° corner geometry during transit
- Galvanized tubes packaged with separation layers to prevent zinc coating damage from friction between adjacent pieces
- Container loading optimized for 5.8 m and 12 m lengths to maximize payload while respecting road weight limits at destination
- Custom cut-to-length sections individually labeled with heat number, steel grade, and dimensional specifications
- Professional flatbed and open-top container loading for oversized sections exceeding standard container dimensions
- FOB, CIF, and DDP shipping terms available with complete export documentation and tracking until arrival
Requesting a Quotation for Your Project
Submit your specification sheet indicating steel grade (S235JR through S355J2H), section dimensions, wall thickness, total tonnage, and destination port — we respond within 12 hours with a detailed quotation including material cost, any cutting or processing fees, and shipping terms. For non-standard sizes or mixed-container orders combining multiple section dimensions, our technical team provides custom loading plans and confirms availability before you commit. Mill test certificates and CE documentation are confirmed in writing before production begins, ensuring your project compliance requirements are met from the first shipment.
Frequently Asked Questions
Q: What is the difference between S355JR and S355J2H for sharp corner rectangular tubes?
A: Both grades meet the same minimum yield strength requirement under EN10219, but the suffix indicates different impact test temperatures — JR requires testing at +20°C while J2 requires testing at -20°C. For projects in cold climates or outdoor structural applications subject to low temperatures, S355J2H provides verified toughness at sub-zero conditions.
Q: Can you provide ASTM A500 equivalence for EN10219 S355JR sections?
A: We supply S355JR sharp corner square and rectangular steel tube under EN10219 and can provide cross-reference documentation showing equivalence to ASTM A500 Grade B or Grade C upon request. The mill test certificate documents the actual chemical composition and mechanical properties, allowing your engineer to verify compliance with project specifications.
Q: What is the minimum order quantity for custom cut-to-length sections?
A: The minimum order is 1 Ton, and we accommodate mixed-size orders combining different section dimensions and lengths in a single shipment. Custom cutting to your specified lengths is available with dimensional inspection reports provided before dispatch.
Q: How do you ensure corner radius consistency on sharp corner tubes?
A: Our cold-forming process uses precision forming rolls calibrated to maintain 90° corners with tight inner radius control across the full production run. Final inspection includes dimensional verification of corner geometry, flatness, and wall thickness tolerance before sections are approved for shipment.
Q: What surface treatment options are available for outdoor structural applications?
A: For outdoor exposure, we offer hot-dip galvanized coating for corrosion protection, 3PE coating for aggressive environments, or painted finish with shop primer for subsequent top-coating at site. Bare or oiled finish is available for indoor applications or sections that will receive fireproofing.
Get Your S355JR Sharp Corner Tube Quote with Mill Test Certificates
Send your section dimensions, steel grade, quantity, and destination port to receive a detailed quotation and sample mill test certificate within 12 hours.
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
