Description
Factory-Direct Sharp-Corner SHS/RHS — Three dedicated production lines in Jinan manufacture true 90° corner profiles in S355JR through S355J2H, eliminating the rounded-radius compromise found in conventional ERW catalogs.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR S355J0 S355J2H 90 Degree 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, S355J2, ASTM A53 GR.B, Q460, A36, SS400 |
| Standard | EN10210, EN10219, ASTM A53, ASTM A500 |
| Section Shape | Square / Rectangular |
| Size Range | 15×15mm–1000×1000mm (Square) / 20×30mm–600×800mm (Rectangular) |
| Wall Thickness | 0.5mm–50mm |
| Length | 5.8m–14m or custom |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Galvanized / 3PE / Varnish / Coating |
| Ends | Plain / Cut / Threaded / Beveled / Flanged |
| Tolerance | ±1% |
| Application | Steel structures / Construction frames / Machinery / Scaffolding / Furniture / Greenhouse / Urban & civil construction / Low pressure fluid transport |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors & Steel Structure Fabricators | Moment-resisting frames, exposed architectural columns, bracing members requiring flush corner joints |
| Machinery Manufacturers | Conveyor system frames, automation equipment bases, robotic cell structures needing exact right-angle geometry |
| Construction Companies | High-rise building skeletons, bridge support towers, infrastructure scaffolding with CE-marked structural hollow sections |
| System Integrators | Industrial racking systems, modular cleanroom frames, material handling gantries |
Where 90-Degree Corner Accuracy Decides Site Assembly Costs
A rounded radius masquerading as a sharp corner forces every downstream connection into rework.
On a Jakarta high-rise frame last year, a batch of so-called “sharp-corner” RHS arrived with R-values exceeding 3mm. Welders spent fourteen days grinding and shimming gusset plates that were supposed to sit flush. The S355JR S355J2H 90 Degree Sharp Corner Square and Rectangular Steel Tube eliminates this risk through patented cold-forming technology that achieves true internal and external right angles — not the gradual curve produced by standard ERW dies. When your structural drawings call for 90°, anything less means field-cutting, fit-up delays, and inspector skepticism. [NEED_CITE: EN 10219 cold-formed structural hollow section dimensional tolerance requirements]
Matching Moment-Resisting Frames and Precision Machinery Bases
The S355JR S355J2H 90 Degree Sharp Corner Square and Rectangular Steel Tube delivers the geometric fidelity that moment-resisting connections demand. Gusset plates, end plates, and through-bolts seat against a flat 90° face rather than a curved radius, transferring load without eccentricity. For conveyor fabricators and automation integrators, this means linear modules align on first attempt — no trial-and-error shimming. Our three dedicated sharp-corner production lines hold ±1% dimensional tolerance across wall thicknesses from 0.5mm to 50mm, verified by in-house physical and chemical laboratories before every shipment leaves Jinan.
Structural Code Compliance and Corrosion Environment Selection
Engineering specifications for S355J2H sections must satisfy EN 1993 (Eurocode 3) or AISC 360 depending on destination market. The S355JR S355J2H 90 Degree Sharp Corner Square and Rectangular Steel Tube carries CE marking under EN 10210 and EN 10219, clearing EU port customs without supplementary documentation disputes. For tropical coastal sites or industrial atmospheres, hot-dip galvanizing or 3PE coating extends service life where bare S355JR would corrode within months. Impact-tested S355J2H grades handle sub-zero environments down to −20°C, while S235JR suffices for indoor furniture and greenhouse frames. [NEED_CITE: steel grade selection guidance for structural hollow sections in corrosive environments]
Steel Grade Hierarchy and Sharp-Corner Forming Fundamentals
The EN 10210/10219 S-series progresses from S235JR through S275JR to S355JR, S355J0, and S355J2H — each step delivering higher yield strength and improved low-temperature toughness. S355J2H adds Charpy impact testing at −20°C, making it the default for outdoor structural frames in variable climates. Q460 and ASTM A53 GR.B serve projects specifying Chinese or American standards respectively; cross-reference documentation accompanies every order. The patented sharp-corner forming process differs fundamentally from conventional ERW: instead of passing strip through rounded die radii, the material is cold-formed through a sequence of flat platens that produce true 90° internal and external corners. This geometry matters structurally — load paths follow the corner without stress concentration at a curve — and aesthetically, exposed architectural frames present clean sightlines. Wall thickness up to 50mm covers heavy industrial columns, while 0.5mm–3mm sections serve furniture and light framing. [NEED_CITE: cold-formed sharp-corner rectangular tube forming mechanics]
The Hidden Price of Accepting Rounded Radii as Sharp Corners
Procuring tubes labeled “sharp corner” that actually carry 2–4mm R-radii triggers compounding costs: gusset plates require field-grinding, bolt holes drift from theoretical positions, and structural inspectors reject connections that deviate from approved shop drawings. Missing or incomplete mill test certificates delay customs clearance — particularly for CE-marked EN 10210 sections entering EU ports — forcing air-freight supplements or project standstill. Negative tolerance abuse on wall thickness reduces theoretical weight on paper but compromises load-bearing capacity in practice, creating latent safety liabilities that surface only during structural loading tests. [NEED_CITE: consequences of dimensional non-compliance in structural steel procurement]
Why Engineering Procurement Teams Specify Our Sharp-Corner Lines
We operate three dedicated production lines in Jinan solely for sharp-corner SHS and RHS — no conventional rounded-radius tooling shares the floor. Every heat receives incoming, in-process, and final inspection in our physical and chemical laboratories; original EN 10204 3.1 mill test certificates document chemical composition and mechanical properties per shipment. The sharp-corner rectangular tube technology holds 41 patents, filling specification gaps that standard catalogs cannot cover — including non-standard dimensions outside the 2,800+ regular offerings. CE certification under EN 10210 and EN 10219, Lloyd’s Register EU CE, Singapore FPC, ISO 9001:2015, and SGS/BV third-party verification satisfy the most stringent import compliance regimes across 50+ destination countries. Custom non-standard sizes,定尺 cutting to 5.8m–14m, and professional container loading plans eliminate the fragmented sourcing that forces EPC teams to coordinate pipes, plates, and beams across multiple vendors.
Documentation & Compliance
- Mill test certificate documenting S355JR/S355J2H chemical composition and yield strength per EN 10219, traceable by heat number
- CE certificate under EN 10210 and EN 10219 for EU market customs clearance and structural code compliance
- ISO 9001:2015 quality management system certificate covering sharp-corner forming and welding processes
- SGS or BV third-party inspection report available upon request, covering dimensional, visual, and non-destructive testing
- Material traceability sheet linking each bundle to heat number, steel grade, and production date
- Full customs document package: packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- Sharp-corner SHS/RHS bundled with high-tensile steel strips and edge protectors to preserve 90° corner geometry during ocean transit
- Galvanized or painted surfaces wrapped in waterproof PE sleeves with desiccant packets to prevent white rust or coating adhesion loss
- Container loading plans optimized for 5.8m–14m lengths, maximizing 20ft and 40ft HC payload while preventing corner damage
- Custom cut-to-length service available for 5.8m, 6m, 12m, or project-specific dimensions, with beveled or plain ends per specification
- Each bundle tagged with heat number, steel grade (S355JR/S355J2H), size, and length for site identification and traceability
- FOB Jinan/Qingdao, CIF destination port, or DDP door-to-door delivery with real-time tracking across 50+ countries
Requesting a Sharp-Corner Quotation with Mill Test Documentation
Submit your specification sheet — including section dimensions, wall thickness, steel grade (S355JR/S355J0/S355J2H), quantity, surface treatment, and destination port — and receive a detailed quotation within 12 hours covering unit price, production lead time, payment terms, and applicable certifications. For non-standard dimensions outside the 2,800+ regular catalog, our engineering team provides custom feasibility confirmation and tooling lead time. Confirm CE EN 10210/10219 certification requirements and SGS/BV third-party inspection scheduling before contract signing to align with your project compliance timeline.
Frequently Asked Questions
Q: How do S355JR, S355J0, and S355J2H differ in impact testing requirements?
A: S355JR requires room-temperature impact testing, S355J0 adds 0°C Charpy testing, and S355J2H mandates −20°C impact validation — making S355J2H the standard choice for outdoor structural frames in variable or cold climates.
Q: Can I request SGS or BV third-party inspection before shipment?
A: Yes. Third-party inspection covering dimensional verification, visual examination, and non-destructive testing is available upon request and documented in a separate report alongside the mill test certificate.
Q: What is the minimum order quantity for custom sharp-corner sizes outside the standard catalog?
A: The MOQ is 1 Ton for both standard and custom non-standard dimensions, though custom tooling may require additional lead time depending on section complexity.
Q: Are CE EN 10210/10219 certificates accepted at all European ports?
A: Yes. Our CE marking under EN 10210 and EN 10219, verified by Lloyd’s Register, satisfies EU Construction Products Regulation requirements for structural hollow sections entering any EU member state port.
Q: When should I specify hot-dip galvanized versus painted or 3PE coating?
A: Hot-dip galvanizing suits long-term outdoor exposure in rural or industrial atmospheres; painted systems offer color matching for architectural applications; 3PE coating provides the highest corrosion resistance for buried or submerged structural elements.
Get Your S355JR/S355J2H Sharp-Corner Quotation with Full Mill Test Documentation
Send your specification sheet — dimensions, steel grade, quantity, surface treatment, and destination — to receive pricing, production timeline, and certification confirmation within 12 hours.
Email: admin@sdxjysteel.com | WhatsApp/WeChat: +86 188 5315 7756 | Tel: +86 531 8573 6315
