Description
One-Stop Sharp-Corner Tube Sourcing — 2,800+ specification coverage including S355J2H sharp corner rectangular steel tube with full EN10210/EN10219 certification.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JR S355J2H Sharp Corner Square and Rectangular Steel Tube |
| Product Type | Sharp Corner Square and Rectangular Steel Tube |
| Steel Grade | S235JR, S275JR, S355JR, S355J0, S355J2H, 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 as required |
| Technique | ERW (Hot Rolled Carbon Steel Welded) |
| Surface Treatment | Bare / Oiled / Painted / Galvanized / 3PE / Coating |
| Ends | Plain / Cut / Threaded / Beveled / Flanged |
| Tolerance | ±1% |
| Application | Steel structures / Urban and civil construction / Machinery structures / Scaffolding / Greenhouse / Furniture / Low pressure fluid transport / Building materials |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural Facades | Glass curtain wall framing, exposed structural columns, building envelope supports |
| Steel Structure Fabrication | Industrial warehouse frames, bridge node connections, heavy-load beam assemblies |
| Machinery Manufacturing | Equipment base frames, conveyor support structures, hydraulic press columns |
| Infrastructure Construction | Scaffolding systems, solar mounting structures, utility pole frameworks |
| Commercial Construction | Furniture frames, greenhouse skeletons, interior decorative structural elements |
Where Rounded Corners Fail on Facade Projects
True 90-degree sharp corners eliminate visible gaps at node connections that standard R≥2t rectangular tubes create.
I once watched a facade crew in Ho Chi Minh City spend three days grinding down rounded corners on standard rectangular tubes — still couldn’t get the glass curtain wall mullions to sit flush. The entire batch was rejected because the rounded profiles left shadow lines visible through the glazing system. Sourcing a genuine S355J2H sharp corner rectangular steel tube supplier who holds patent-level corner-forming capability remains a persistent gap for EPC contractors working on architectural envelope projects [NEED_CITE: sharp corner rectangular tube dimensional tolerance requirements for curtain wall systems]. Beyond aesthetics, rounded corners reduce the effective bearing surface at welded or bolted connections, compromising structural rigidity in moment-resisting frames. Many mills claim “rectangular tube” on their certificates but deliver product with corner radii that fail architectural inspection on site.
Matching Sharp-Corner Geometry to Structural Connection Demands
The S355J2H sharp corner rectangular steel tube delivers flat-to-flat contact at welded and bolted joints, which is critical when curtain wall mullions must transfer lateral wind loads directly into the primary frame without rotational play. Wall thickness options from 0.5mm to 50mm cover everything from lightweight interior furniture frames to heavy structural columns in industrial buildings. The ERW hot-rolled welded process maintains ±1% dimensional tolerance across the full 15×15mm to 1000×1000mm size range, ensuring that site fabricators receive consistent section properties for load calculations. Our patented corner-forming technology produces true right angles across all 2,800+ specifications we manufacture, giving facade contractors the crisp profile lines that glass curtain wall systems demand.
Engineering Compliance and Certification Pathways
Structural engineers specifying S355J2H under EN10219 need documentation that confirms both chemical composition and impact toughness at sub-zero temperatures — the J2H designation specifically requires Charpy testing at -20°C [NEED_CITE: EN 10219 cold-formed structural hollow section material requirements]. For projects entering the EU market, CE certification under EN10210/EN10219 is non-negotiable for customs clearance and site inspection approval. Surface treatment selection depends on the service environment: hot-dip galvanized coating suits outdoor infrastructure exposed to atmospheric corrosion, while 3PE coating provides mechanical damage resistance for buried or abrasion-prone installations. Custom non-standard dimensions are available with low MOQ, allowing project-specific orders without the volume commitments that traditional mills require.
Steel Grade Selection and ERW Welding Process Fundamentals
The S-series structural grades follow a yield strength hierarchy: S235JR provides baseline strength for non-critical framing, S275JR steps up for moderate load paths, and S355JR/S355J2H deliver higher yield capacity for primary structural members where weight optimization matters. The J0 and J2H suffixes indicate increasing impact energy requirements — J2H guarantees toughness at -20°C, making it suitable for cold-climate installations and dynamically loaded structures. ASTM A53 GR.B and A500 grades serve North American projects where local code compliance is mandatory, while Q460 addresses Chinese-standard specifications for domestic infrastructure. The ERW hot-rolled welded process forms the tube from coil stock through progressive roll-forming and high-frequency electric resistance welding, producing a continuous longitudinal weld seam with heat-affected zone properties that meet EN10219 requirements. Wall thickness tolerance of ±1% ensures that theoretical weight calculations align with actual delivered mass, preventing cost overruns on tonnage-based procurement.
Hidden Costs of Compromised Tube Procurement
Ordering rectangular tubes without verified sharp-corner geometry leads to on-site rework when facade panels fail to align — grinding, filling, and repainting rounded corners adds labor costs that exceed the original material savings. Material substitution without proper certification creates customs clearance failures: EU port authorities reject shipments lacking CE-marked EN10219 documentation, triggering demurrage charges and project delays [NEED_CITE: CE marking requirements for structural steel imports into European Union]. Negative tolerance abuse — where actual wall thickness falls below the specified minimum — reduces load-bearing capacity and voids structural engineer approvals, forcing complete batch replacement. Sourcing from an unverified S355J2H sharp corner rectangular steel tube supplier risks receiving product with inconsistent corner radii, weld seam defects, or grade misidentification that only surfaces during third-party inspection or structural testing.
Why Project Procurement Teams Source From Us
We manufacture the S355J2H sharp corner rectangular steel tube using our patented 90-degree corner-forming technology — 41 invention patents that originated China’s first true sharp-corner rectangular tube production. Our in-house physical and chemical laboratory performs full mill test certification on every heat, providing EN10204 3.1/3.2 documentation with verified chemical composition and mechanical properties. The 2,800+ specification range covers wall thicknesses up to 50mm, allowing single-source procurement for projects requiring both light architectural sections and heavy structural members. Full international certification portfolio includes ISO 9001:2015, Lloyd’s CE marking under EN10210/EN10219, Singapore FPC, and third-party verification through SGS and BV. Professional container loading with anti-damage measures prevents the bending and surface scratching that commonly occurs during ocean transit of long-length tubes.
Documentation & Compliance
- Mill test certificate documenting S355J2H chemical composition and Charpy impact energy at -20°C per EN10219 requirements
- CE certificate confirming EN10210/EN10219 compliance for structural hollow sections entering EU markets
- ISO 9001:2015 quality management system certificate covering manufacturing and testing processes
- SGS or BV third-party inspection report verifying dimensional accuracy and surface treatment thickness
- Material traceability documentation linking each tube to heat number and production batch records
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Sharp corner rectangular tubes bundled with steel strips and edge protectors to preserve 90-degree corner geometry during transit
- Galvanized S355J2H tubes wrapped with moisture-resistant barriers to prevent white rust formation during ocean shipping
- Container loading optimization for 5.8m–14m lengths maximizes payload while preventing bundle shift and surface damage
- Custom cutting to project-specific lengths reduces on-site waste and eliminates field cutting of galvanized coatings
- Heat number and steel grade markings stenciled on each tube for site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional loading supervision and door-to-door logistics coordination
Initiating Your Sharp-Corner Tube Procurement
Submit your specification sheet detailing section dimensions, wall thickness, steel grade, surface treatment, quantity, and destination port to receive a detailed quotation within 12 hours. We provide mill test certificates, third-party inspection coordination, and custom non-standard dimension pricing for project-specific requirements. Our engineering team reviews your drawings to confirm sharp-corner feasibility and suggests optimal specifications for your structural application.
Request Your S355J2H Sharp Corner Rectangular Steel Tube Quotation
Send your project specifications to receive pricing, lead times, and certification documentation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
Frequently Asked Questions
Q: What is the difference between S355JR and S355J2H for sharp corner rectangular tube applications?
A: S355JR requires impact testing at room temperature (20°C), while S355J2H mandates Charpy impact testing at -20°C, making J2H suitable for cold-climate installations and dynamically loaded structures where low-temperature toughness is critical.
Q: Can you produce non-standard dimensions outside the listed size range?
A: Yes, we manufacture custom non-standard sharp corner rectangular tubes beyond the 15×15mm to 1000×1000mm range with low MOQ of 1 Ton, provided the dimensions are technically feasible for our patented corner-forming process.
Q: How do you verify sharp corner quality on EN10219 products?
A: Our in-house laboratory performs dimensional inspection on corner radii, flat-to-flat measurements, and weld seam integrity. Third-party inspection through SGS or BV is available to independently verify corner geometry and material properties before shipment.
Q: What surface treatment is recommended for outdoor architectural facade applications?
A: Hot-dip galvanized coating provides long-term atmospheric corrosion protection for exposed facade elements, while painted or 3PE coating offers additional aesthetic customization and mechanical damage resistance for high-traffic or abrasion-prone installations.
Q: Do your CE certificates cover all steel grades in the S355 series?
A: Yes, our CE certification under EN10210/EN10219 covers the full S235JR through S355J2H range, ensuring compliance for EU market entry regardless of which grade your structural engineer specifies.
