Description
Factory-direct sharp corner SHS/RHS — every S355JR sharp corner square steel tube rolls from our own ERW line with original MTC heat numbers, cutting out trader markups on structural sections.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR / S235JR / S275JR / S355J2 Sharp Corner Square & Rectangular Steel Tube |
| Product Type | Sharp Corner Square and Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J2, S355J2H, S355J0H, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219 |
| Section Shape | Square / Rectangular (Right Angle 90° Sharp Corner) |
| Size Range | Square 15×15 mm – 1000×1000 mm; Rectangular 20×30 mm – 600×800 mm |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m (or cut to order) |
| Technique | Hot Rolled Carbon Steel Welded (ERW) |
| Surface Treatment | Bare / Oiled / Painted / Varnish / Galvanized / 3PE / Coating |
| Ends | Plain ends / Cutting / Threading / Beveled / Flange |
| Tolerance | ±1% |
| Application | Urban and civil construction structures, machine structure frames, agricultural equipment, water and gas pipelines, greenhouse frames, scaffolding, building material tubes, furniture frames, low-pressure fluid transport, oil pipelines |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Fabricators | Structural frames for warehouses, heavy equipment skids, conveyor supports |
| Construction Companies | High-rise building columns, bridge handrails, infrastructure support frames |
| Scaffolding & Greenhouse | Scaffolding uprights, greenhouse arch frames, agricultural equipment structures |
| Machinery & Equipment | Machine base frames, crane booms, hydraulic support structures |
What Rounded Radii Cost on a Structural Frame Order
A true 90° sharp corner eliminates gap-filling, re-welding, and fitting delays on site.
Fabricators ordering S355JR sharp corner square steel tube often receive sections with oversized corner radii marketed as “sharp corner” — the result is visible gaps at moment connections, extra welding filler, and hours of grinding to achieve flush joints. When wall thickness also runs negative tolerance, the as-built section modulus drops below design assumptions, forcing engineers to either accept reduced load capacity or scrap entire batches. [NEED_CITE: EN 10219 cold-formed hollow section corner radius requirements]
Matching Sharp Corner Geometry to Structural Connections
The 90° right-angle profile of S355JR sharp corner square steel tube allows moment connections and base plates to sit flush without shimming, which matters when a high-rise core frame has hundreds of beam-to-column joints. For greenhouse and scaffolding applications, the consistent external dimensions mean clamp-type connections grip uniformly — no loose fittings from oversized corner bulges. Our ERW forming process holds corner radii within EN10210 limits across the full 15×15 mm to 1000×1000 mm range, so fabricators get repeatable fit-up from the first tube to the last.
Engineering Compliance and Certification Path
Structural frames designed to EN 1993 require hollow sections certified to EN10210 or EN10219, with mill test certificates showing heat-level chemical composition and mechanical properties. For projects entering the EU market, CE marking under EN10210 is mandatory for load-bearing sections — customs will hold shipments without it. [NEED_CITE: CE marking requirements for structural steel hollow sections under EN 10210] The S355JR and S355J2 grades we supply meet the impact testing requirements at +20°C and -20°C respectively, giving engineers clear selection criteria for heated versus unheated structures. Cut-to-length service means site crews receive exact member lengths, reducing field cutting and preserving the sharp corner geometry at connection points.
Steel Grade Selection and ERW Weld Integrity
S235JR, S275JR, and S355JR represent increasing yield strength tiers in the EN standard system — choosing S355JR over S235JR allows smaller section sizes for the same load, reducing tonnage and shipping cost. The Q series (Q460) and ASTM A36/A53 grades serve different regional specification systems, and we provide equivalence documentation to prevent substitution errors. [NEED_CITE: steel grade equivalence between EN 10219 and ASTM A500 standards] Our hot-rolled ERW process includes hydrostatic testing and nondestructive seam inspection, ensuring the weld line matches base metal integrity — critical when sharp corner tubes undergo cold bending or punching on site. Wall thickness tolerance of ±1% prevents the hidden negative-tolerance practice where actual weight falls short of theoretical calculations, protecting both structural capacity and your budget accuracy.
Hidden Costs of Wrong Grade or Missing Certification
Ordering S355J2 for a -20°C environment but receiving S355JR without impact test data risks brittle fracture under dynamic loading — the failure shows up only after cracks propagate. [NEED_CITE: Charpy impact testing requirements for structural steel at sub-zero temperatures] Missing heat numbers on mill test certificates mean customs authorities in destination countries can reject the entire container, or engineers can refuse to sign off on structural inspections. Negative-tolerance walls that pass visual inspection but fail ultrasonic thickness measurement force complete dismantling of erected frames — the rework cost dwarfs any initial price saving from unverified suppliers.
Why Fabricators Source S355JR Sharp Corner Tube From Us
We run our own ERW forming lines in Jinan, so every S355JR sharp corner square steel tube ships with factory-direct pricing — no trading company margin on structural sections. Our in-house理化实验室 issues original mill test certificates with heat-level chemistry and mechanical data, not third-party reprints. The sharp corner forming technology holds 41 patents for right-angle geometry control across wall thicknesses up to 50 mm. We stock over 2800 cross-section combinations, so non-standard rectangular sizes like 600×800 mm don’t require minimum rolling quantities. Every shipment carries CE certification for EN10210/EN10219 compliance, and we arrange SGS or BV third-party inspection at our facility before container sealing. Professional flatbed and open-top container loading handles the 5.8 m to 14 m lengths without corner damage.
Documentation & Compliance
- Mill test certificate documenting S355JR chemical composition and yield strength per EN10219, with heat number traceability
- CE certificate confirming EN10210 compliance for structural hollow sections entering EU markets
- ISO 9001:2015 quality management certificate covering the full ERW production and inspection process
- SGS or BV third-party inspection report verifying dimensional tolerance and surface quality before shipment
- Material traceability report linking each bundle to its heat number, chemical composition, and mechanical test results
- Export customs documents 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° corner geometry during ocean transit
- Bare or oiled surfaces wrapped in waterproof paper; galvanized tubes receive additional plastic sleeve protection to prevent zinc coating damage
- Open-top container or flatbed loading optimized for 5.8 m and 12 m lengths, maximizing payload while preventing bundle shift
- Cut-to-order lengths marked with heat number and steel grade stenciled on each piece for site identification
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door delivery with full export documentation
Getting Your Sharp Corner Tube Quote
Send us your section dimensions (square or rectangular), steel grade requirement, wall thickness, total tonnage, and destination port — we respond within 12 hours with pricing, mill test certificate sample, and production lead time. For non-standard sizes outside the 15×15 mm to 1000×1000 mm range, we provide custom forming feasibility confirmation within 24 hours.
Request S355JR Sharp Corner Square Steel Tube Pricing
Submit your specifications and destination to receive a detailed quotation with original mill test certificate documentation.
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