Description
Vertically Integrated Sharp Corner Tube Mill — Own steel production and fabrication under one roof eliminates material sourcing gaps for S355J2H sharp corner square and rectangular welded steel tubes.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355J2H Sharp Corner Square and Rectangular Welded Steel Tube |
| Product Type | Sharp Corner Square and Rectangular Welded Steel Tube (SHS / RHS) |
| Steel Grade | S235JR, S275JR, S355JR, S355J2H, S355J0, ASTM A53 GR.B, A36, SS400, Q460 |
| Standard | EN10210, EN10219, ASTM A53, ASTM A500, JIS G3466, GB/T 6728 |
| Section Shape | Square / Rectangular (Sharp Corner 90°) |
| Size Range | 15×15 mm – 1000×1000 mm (Square) / 20×30 mm – 600×800 mm (Rectangular) |
| Wall Thickness | 0.5 mm – 50 mm |
| Length | 5.8 m – 14 m (or custom cut-to-length) |
| Technique | ERW (Electric Resistance Welded) / Hot Rolled |
| Surface Treatment | Bare / Oiled / Painted / Galvanized / 3PE / Varnish |
| Ends | Plain / Beveled / Threaded / Flanged |
| Tolerance | ±1% (dimensional) |
| Application | Steel structures / Construction frames / Machinery structures / Scaffolding / Greenhouse structures / Furniture / Urban & civil construction / Low-pressure fluid transport / Agricultural equipment |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC / General Contractors | Structural steel frames for commercial buildings, industrial warehouses, and logistics centers |
| Steel Structure Companies | Scaffolding systems, column-beam assemblies, and connection nodes for mid-rise construction |
| Industrial Project Developers | Machinery support frames, equipment platforms, and conveyor structures in manufacturing plants |
| Agricultural Equipment Manufacturers | Greenhouse skeleton frames, irrigation support structures, and equipment shelters |
| Urban & Civil Construction | Bridge railings, sound barrier supports, and municipal infrastructure frameworks |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
Tolerance drift on sharp corner square and rectangular steel tubes compounds into structural rework and customs delays.
When procurement teams source S355J2H sharp corner square and rectangular welded steel tubes from fragmented suppliers, the corner radius inconsistency from cold-forming processes creates gaps at welded connections — forcing site crews to grind and re-fit before bolts can be torqued. Material traceability breaks down when fabricators source raw steel from unverified third parties, leaving buyers unable to produce EN 10204 3.1 certificates during third-party audits. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements] The result is a shipment that looks correct on paper but fails inspection at the port or on-site, triggering weeks of delay on time-critical infrastructure projects.
How Sharp Corner Geometry Matches Structural Connection Requirements
True 90-degree sharp corners on S355J2H sharp corner square and rectangular welded steel tubes allow flush contact at gusset plates and moment connections, eliminating the filler shimming that rounded cold-formed corners demand. The hot-rolled ERW process produces corners with uniform wall thickness — no thinning at the bend radius that compromises load transfer in braced frames. For EPC projects across the Middle East and Southeast Asia, this dimensional consistency means shop drawings translate directly to fabrication without on-site modification, and the vertically integrated supply chain ensures every heat of steel carries full mill certification from raw slab to finished tube.
Structural Code Compliance and Surface Protection Selection
Engineering specifications for S355J2H sharp corner square and rectangular welded steel tubes typically reference EN 1993-1-1 for limit state design, requiring verified yield strength and impact toughness at sub-zero temperatures — the J2H designation confirms Charpy V-notch testing at -20°C. [NEED_CITE: steel grade equivalence between EN 10210 and ASTM A500 standards] For outdoor or coastal installations, surface treatment selection becomes critical: hot-dip galvanizing provides sacrificial zinc protection for scaffolding and bridge components, while 3PE coating suits buried or splash-zone structural supports. CE marking per EN10210-1 is mandatory for European market projects, and third-party inspection by SGS or BV validates both dimensional accuracy and coating thickness before container loading. Custom cut-to-length between 5.8 m and 14 m reduces on-site welding and secondary cutting waste.
Steel Grade Selection and Hot-Rolled ERW Process Fundamentals
The S-series structural grades — S235JR, S275JR, S355JR, S355J0, and S355J2H — represent incrementally higher minimum yield strength, with the J2H suffix specifying impact energy verification at -20°C for cold-climate or dynamic-load applications. ASTM A53 GR.B and A36 serve North American projects where imperial standards govern, while SS400 and Q460 address Japanese and Chinese domestic specifications respectively. The hot-rolled ERW technique for S355J2H sharp corner square and rectangular welded steel tubes differs fundamentally from cold-forming: the steel strip is heated, formed into shape, and welded while still at elevated temperature, producing sharp 90-degree corners without the micro-cracking and wall thinning that cold-bending introduces at the radius. This process also allows wall thicknesses from 0.5 mm to 50 mm across the full size range, accommodating both light-gauge greenhouse frames and heavy industrial column sections.
The Hidden Cost of Tolerance Deviation and Missing Certification
Procuring S355J2H sharp corner square and rectangular welded steel tubes without verified mill test certificates creates a cascade of downstream failures: customs authorities in EU member states reject shipments lacking CE documentation per EN10210-1, third-party inspectors halt acceptance when heat numbers cannot be traced to chemical composition reports, and structural engineers cannot sign off on load calculations without confirmed mechanical properties. [NEED_CITE: EN 10204 inspection document types for steel products] Negative tolerance abuse — where wall thickness consistently drifts below the nominal minus allowance — reduces actual load-bearing capacity while theoretical weight pricing masks the material shortfall, leaving buyers paying for steel they did not receive.
Why Procurement Teams Consolidate Sharp Corner Tube Orders Here
The vertically integrated operation controls the entire chain from raw steel production through finished S355J2H sharp corner square and rectangular welded steel tubes, meaning material certificates originate from the same facility that rolls and welds the product — no gaps in the traceability chain. An in-house理化 laboratory performs chemical composition analysis and mechanical testing on every heat, producing EN 10204 3.1 mill test certificates before shipment. The inventory spans over 2,800 specifications in steel grades from S235JR to S355J2H, enabling single-source procurement for projects requiring mixed sizes and grades in a single shipment. Certified welding procedures per AWS and EN standards, combined with CE marking for EN10210 and EN10219 compliance, satisfy both European and international project requirements. Professional loading teams plan container stowage for tubes up to 14 m length, maximizing payload while protecting sharp corner geometry and surface coatings during ocean transit.
Documentation & Compliance
- Mill test certificate documenting S355J2H chemical composition, yield strength, and Charpy V-notch impact energy at -20°C per EN10219
- CE certificate confirming EN10210-1 and EN10219-1 compliance for structural hollow sections entering European Union markets
- ISO 9001 quality management system certificate covering the full production process from raw material inspection to finished tube dispatch
- SGS or BV third-party inspection report verifying dimensional tolerance, coating thickness, and weld seam integrity at buyer’s request
- Full material traceability linking each tube bundle to its heat number, chemical analysis report, and mechanical test results
- Export documentation package including packing list, bill of lading, and certificate of origin for customs clearance at destination port
Packaging, Loading & Delivery
- S355J2H sharp corner square and rectangular welded steel tubes bundled with high-tensile steel strips and edge protectors to preserve 90-degree corner geometry during handling
- Galvanized surface tubes wrapped with waterproof paper and plastic film to prevent white rust formation during ocean transit
- Custom cut-to-length tubes between 5.8 m and 14 m loaded with optimized container stowage plans maximizing payload for 20ft and 40ft open-top containers
- Each bundle tagged with heat number, steel grade S355J2H, size specification, and length for on-site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with professional lashing and securing for breakbulk and container shipments to port destinations worldwide
How to Initiate a Sharp Corner Tube Inquiry
Submit project drawings or specification sheets indicating steel grade, section dimensions, wall thickness, length requirements, surface treatment preference, and destination port to receive a detailed quotation including material cost, fabrication charges, coating fees, and shipping estimates. The engineering team reviews shop drawings within 24 hours and confirms production scheduling, mill test certificate availability, and third-party inspection coordination before contract execution.
Request Your S355J2H Sharp Corner Tube Quotation
Share your project specifications, steel grade requirements, and destination port to receive a detailed quotation with mill test certificates and production lead times.
Contact:
Company: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
