S355JR Sharp Corner Square Rectangular Steel Tube EN10210 Manufacturer

Description

Factory-Direct Sharp Corner SHS/RHS — Every S355JR sharp corner square rectangular steel tube rolls from our own mill with 2,800+ raw material specs in stock, cutting out trading margins before fabrication begins.

Technical Specifications

Application Suitability

What Wall-Thickness Tolerance Costs on a Structural Frame Order

A ±1% tolerance on a 10mm wall S355JR sharp corner square rectangular steel tube means the difference between passing dimensional inspection and scrapping an entire container at the port.

I once watched a Middle East project reject a full shipment of 100×100 S355J2 tubes because the actual wall measured 3.6mm against a 4mm nominal — the negative tolerance had been pushed so deep that theoretical weight and actual weight diverged by nearly a ton. The buyer paid return freight, waited weeks for replacement, and nearly switched suppliers. On sharp corner SHS/RHS, corner radius consistency and wall uniformity are inseparable from structural load calculations. When fabricators source from third-party mills without integrated QC, material certificates rarely match what arrives on site. [NEED_CITE: EN 10219 tolerance requirements for hot finished structural hollow sections]

Matching Sharp Corner Geometry to Structural Connection Details

Sharp corner 90-degree profiles eliminate the gap problems that rounded RHS creates at moment connections and base plates. On a recent warehouse project in Southeast Asia, the EPC contractor specified S355JR sharp corner square rectangular steel tube for portal frame columns because the flat-to-flat contact surface allowed direct bearing plate welding without filler shims. The hot-rolled welded ERW process maintains corner mechanical properties closer to the parent plate than cold-forming, which matters when the design relies on corner-region load transfer. Our own mill produces the raw strip, forms the section, and welds the seam — so the S355JR chemistry and the corner geometry come from one quality system, not two.

Engineering Compliance Across Markets and Environments

S355JR sharp corner square rectangular steel tube produced under EN10210 meets the structural requirements of Eurocode 3 (EN 1993-1-1) for load-bearing frames in EU markets, while the same profile in ASTM A53 GR.B or A36 clears North American customs under ASTM frameworks. For offshore or high-humidity industrial environments, specifying hot-dip galvanized or 3PE coated S355JR tubes extends service life without field painting delays. Wall thickness up to 50mm covers both light-gauge purlin supports and heavy-duty crane runway beams. CE marking under EN10210/EN10219 is mandatory for construction products entering the EU — missing it means customs holds, not just paperwork. [NEED_CITE: CE marking requirements for structural steel under EN 1090-1]

Steel Grade Selection and Hot-Rolled Welded Process Logic

S235JR, S275JR, and S355JR represent ascending minimum yield strength tiers within the EN10210 framework — choosing S355JR over S235JR for a heavily loaded column reduces section size and self-weight without changing the connection detail. The Q460 grade bridges EN and GB specifications for projects sourcing dual-standard documentation. Hot-rolled welded ERW process produces sharp corner SHS/RHS with corner mechanical properties that remain consistent with the flat surfaces, unlike cold-formed alternatives where corner elongation thins the wall and reduces local buckling resistance. Surface treatment selection follows environment: bare or oiled for indoor structural frames, galvanized for outdoor scaffolding and coastal structures, 3PE for buried or submerged applications. The ±1% wall thickness tolerance, verified by ultrasonic measurement at every corner and flat face, prevents the negative-tolerance drift that inflates theoretical tonnage while weakening actual load capacity. [NEED_CITE: comparison of hot-finished vs cold-formed hollow section mechanical properties]

Hidden Costs of Sourcing Without Integrated Material Control

Ordering S355JR sharp corner square rectangular steel tube from a fabricator who buys raw material from a separate mill creates three failure points: the mill test certificate may not trace back to the actual heat, the corner forming process may thin walls beyond tolerance, and the weld seam may lack the same quality documentation as the parent metal. When customs authorities or third-party inspectors flag material discrepancies, the buyer — not the middleman — absorbs demurrage, re-testing fees, and schedule delays. Engineering codes reference specific steel grades and production standards; substituting without documentation voids structural warranties. [NEED_CITE: material traceability requirements under EN 10204 inspection documents]

Why Sourcing from an Integrated Mill-Fabricator Reduces Risk

Our vertically integrated facility operates three production lines and stocks over 2,800 raw material specifications, meaning the S355JR strip that forms your sharp corner tubes comes from the same heat documented in your mill test certificate. Every S355JR sharp corner square rectangular steel tube passes through our in-house laboratory for chemical composition and mechanical verification before release. We hold CE certification for EN10210 and EN10219, ISO 9001 quality management, and welcome SGS, BV, or TÜV third-party inspection at our facility before shipment. Custom lengths from 5.8m to 14m, end preparations including beveling and flanging, and surface treatments from bare to 3PE are all coordinated from one production schedule — no separate procurement for material, fabrication, and coating. Professional loading plans for oversized sharp corner profiles prevent transit damage and maximize container utilization.

Documentation & Compliance

• Mill test certificate documenting S355JR chemical composition (C, Mn, Si, P, S) and yield strength per EN10210, traceable to heat number
• CE certificate confirming EN10210 and EN10219 compliance for structural hollow sections entering EU construction markets
• ISO 9001 quality management certificate covering the full production chain from raw strip to finished sharp corner SHS/RHS
• SGS or BV third-party inspection report available for wall thickness, corner dimensions, and weld seam quality verification
• Material traceability report linking each bundle to its heat number, chemical analysis, and mechanical test results
• Full customs documentation 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 S355JR SHS/RHS packed with waterproof separators to prevent zinc coating abrasion between nested sections
• Custom-length tubes (5.8m–14m) loaded with optimized stowage plans to maximize 20ft and 40ft container payload for 100×100 to 500×500 sections
• Bare or oiled S355JR tubes marked with heat number, steel grade, and dimensional specs on each piece for site identification and traceability
• FOB, CIF, and DDP shipping terms available with professional lashing for oversized sharp corner profiles exceeding standard container door dimensions

Ready to Verify Material Before You Commit?

Submit your project drawings, steel grade requirement (S355JR, S355J2H, or other EN/ASTM equivalents), section dimensions, and destination port — we respond within 24 hours with a detailed quotation including material cost, fabrication, surface treatment, and shipping, plus a sample mill test certificate from a recent S355JR production run.

Request Your S355JR Sharp Corner SHS/RHS Quotation with Full Material Documentation

Send your specifications to admin@xjystructure.com or contact us via WhatsApp/WeChat at +86 188 5315 7756 for pricing, lead times, and third-party inspection coordination.