S355JR Sharp Corner Square Rectangular Steel Tube EN10219/EN10210 Manufacturer

Description

Full-Range Sharp Corner Stock — 2,800+ specifications of EN10219/EN10210 square and rectangular tubes held in our own warehouse, shipped directly from the mill that produces the raw strip.

Technical Specifications

Application Suitability

Where Material Traceability Breaks Down on a Sharp Corner Order

A sharp corner S355J2H tube is only as reliable as the heat number printed on its wall.

When overseas buyers source EN-standard rectangular hollow sections through trading intermediaries, the steel strip often changes hands two or three times before forming. By the time the tube reaches the job site, the mill test certificate references a heat number that cannot be traced back to the original slab chemistry. I have seen third-party inspectors at Jebel Ali reject entire container loads because the Charpy impact values on the delivered certificate did not match the actual test reports from the rolling mill — the gap was not in the steel itself, but in the broken chain of custody between the strip producer and the tube fabricator. For projects governed by EN 1090-2 execution classes, this documentation gap is not a paperwork inconvenience; it is a structural compliance failure. [NEED_CITE: EN 1090-2 execution class documentation requirements for structural hollow sections]

Matching Sharp Corner Geometry to Structural Connection Details

The 90° sharp corner profile of this S355JR EN10219/EN10210 square and rectangular steel tube series allows full-face bearing contact against gusset plates and moment connection flanges — something that rounded-corner cold-formed sections cannot achieve without additional machining. On warehouse portal frames and machinery support structures, this means bolted connections can be drilled and torqued directly to the flat face of the tube wall, eliminating the need for cast steel nodes or welded transition plates. Our hot-rolled ERW forming process holds the ±1% dimensional tolerance across the full 15×15 mm to 1000×1000 mm range, so connection details designed to EN 1993-1-8 can be executed without field rework.

Engineering Compliance Across Corrosive and Load-Bearing Environments

Structural frames in coastal industrial zones or chemical processing facilities demand surface treatment selection that matches the corrosion category defined in EN ISO 12944. The S355JR sharp corner square and rectangular steel tube range is available with hot-dip galvanized coating for C3–C4 environments, 3PE coating for buried or splash-zone applications, or painted systems for controlled indoor conditions. For projects requiring CE marking under the Construction Products Regulation, our EN10210-1 and EN10219-1 certified production lines carry Factory Production Control audits that satisfy EU customs and notified body requirements. [NEED_CITE: CE marking requirements for structural steel hollow sections under CPR Regulation 305/2011] Wall thickness selection from 0.5 mm to 50 mm covers everything from light gauge greenhouse purlins to heavy-duty crane runway beams, with cut-to-length service available for 5.8 m to 14 m定尺 requirements.

Understanding the Steel Grade Ladder and Forming Process

The EN 10219 and EN 10210 standards define a clear progression in yield strength and impact toughness across the S235JR, S275JR, S355JR, S355J0H, and S355J2H grades. The JR suffix indicates room-temperature impact testing at 20°C, while J0 and J2H extend Charpy verification to 0°C and -20°C respectively — critical for structures in cold climates or dynamic loading applications. The hot-rolled ERW process used for these sharp corner sections involves forming pre-heated strip through a series of contoured rolls into a closed section, followed by high-frequency electric resistance welding of the longitudinal seam. This method produces a consistent wall thickness around the sharp 90° corner — unlike cold-formed sections where the corner radius thins the outer fiber. Surface treatment choices depend on the service environment: galvanized coating provides sacrificial zinc protection for outdoor exposure, 3PE combines epoxy primer with polyethylene wrap for mechanical damage resistance, and bare or oiled finishes suit indoor fabrication where the buyer will apply their own coating system after assembly.

The Hidden Cost of Unverified Negative Tolerance

Ordering structural hollow sections at the lowest price per ton often means accepting the maximum permitted negative tolerance on wall thickness. When a 10 mm specified wall arrives at 8.8 mm actual — still within some mill tolerances — the section modulus drops, the buckling resistance decreases, and the structural engineer’s original calculation no longer holds. On EN 1090-2 certified projects, the responsible fabricator must verify as-built dimensions against the design assumptions; if the tube fails, the cost is not a replacement shipment but a halted erection, redesigned connections, and delayed handover. [NEED_CITE: structural consequences of negative tolerance on hollow section load capacity] Material certificates that cannot be traced to a specific heat number compound this risk, because there is no way to confirm whether the delivered chemistry matches the grade stamped on the tube.

Why Direct Mill Supply Closes the Compliance Gap

Our production model eliminates the intermediary layer between raw steel and finished tube. The strip that forms these S355JR sharp corner square and rectangular steel tubes is rolled in our own mill, where chemical composition and mechanical properties are verified at every heat before the material ever reaches the forming line. This vertical integration means the mill test certificate you receive references the same heat number laser-marked on every tube in the bundle — no third-party sourcing gaps, no certificate swapping. Our in-house理化实验室 tests every batch for tensile strength, yield point, elongation, and Charpy impact (for J0 and J2H grades) before release. With 2,800+ specifications held in stock across the full EN10219/EN10210 range, we can consolidate mixed-size orders into single shipments, and our CE-certified Factory Production Control system generates the complete documentation package — including WPS, PQR, weld maps, and coating reports — required for EU and international project handover. Professional loading plans optimize container utilization for oversized sections up to 1000×1000 mm, and third-party inspection by SGS, BV, or TÜV is arranged at our facility before dispatch.

Documentation & Compliance

• Mill Test Certificate EN 10204 3.1/3.2 documenting S355JR chemical composition, yield strength, and Charpy impact values per heat number
• CE Certificate of Conformity confirming EN10210-1 and EN10219-1 compliance for structural hollow sections under CPR Regulation 305/2011
• ISO 9001:2015 quality management system certificate covering the full production chain from strip rolling to finished tube dispatch
• SGS / BV / TÜV third-party inspection reports for dimensional verification, visual weld inspection, and coating thickness measurement
• Heat number traceability matrix linking each bundle to its original slab chemistry and mechanical test results
• Export documentation package including commercial invoice, packing list, bill of lading, and certificate of origin for customs clearance

Packaging, Loading & Delivery

• Sharp corner square and rectangular tubes bundled with high-tensile steel strips and edge protectors to preserve the 90° corner geometry and any galvanized or painted surface finish during ocean transit
• Galvanized sections wrapped in waterproof paper with desiccant inserts to prevent white rust formation in humid container environments
• Mixed-size container loading plans optimized for 20ft and 40ft open-top or flat-rack containers when section dimensions exceed standard door openings
• Cut-to-length service available for 5.8 m to 14 m standard lengths, with beveled or threaded ends prepared per project drawing specifications
• Each bundle labeled with heat number, steel grade (e.g., S355J2H), section dimensions, wall thickness, and production date for site identification
• FOB, CIF, and DDP shipping terms available with door-to-door logistics coordination for project sites in the Middle East, Southeast Asia, Africa, and South America

Getting Your Sharp Corner Order Quoted Correctly

To receive an accurate quotation with mill test certificate preview and production lead time, submit your project drawing or bill of materials specifying section dimensions, wall thickness, steel grade, surface treatment, total tonnage, and destination port. Our engineering team will review the shop drawings, confirm EN10219/EN10210 compliance, and provide a consolidated offer within 24 hours — including any non-standard size or custom length requirements outside the 2,800+ stock range.

Request Your S355JR Sharp Corner Tube Quotation

Send your specifications, steel grade, and quantity to receive a detailed offer with full mill test documentation.

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