Description
Factory Direct Rectangular Hollow Section — Vertically integrated from our own steel mill to finished S355J0H RHS tubes, eliminating third-party sourcing gaps and ensuring full material traceability under one quality system.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355J0H Rectangular Hollow Section Tube |
| Product Type | Rectangular Hollow Section (RHS) / Welded Steel Tube |
| Steel Grade | S355J0H, S235, S355, GrB, STK400, S275 |
| Standard | ASTM A500, ASTM A53, GB/T 3091, ISO 10799-1 |
| Section Shape | Rectangular / Square |
| Size Range | 15mm×20mm – 700mm×800mm |
| Wall Thickness | 1 – 50 mm |
| Length | 5.8m / 6m / 11.8m / 12m / Random Length |
| Technique | Welded (ERW) / Seamless |
| Surface Treatment | Galvanized / Black Painting / Bare |
| Tolerance | ±10% |
| Ends | Plain End with Plastic Cap & Iron Protector |
| Application | Steel structures / Construction frames / Curtain walls / Support tubes / Building structures |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC & Industrial Projects | Factory frame columns, warehouse portal frames, platform support structures |
| Commercial Construction | Building structural columns, beam systems, curtain wall support frames |
| Infrastructure | Bridge support members, transport structure frameworks |
| Agricultural & Storage | Cold storage facility frames, grain silo support structures |
What Wall-Thickness Tolerance Costs on a S355J0H Rectangular Hollow Section Tube Order
A ±10% tolerance deviation on a 700×800mm RHS column can mean the difference between passing structural inspection and full-batch rejection at site.
When overseas buyers source structural hollow sections from fragmented suppliers, the material traceability chain breaks down. Steel purchased from third-party traders carries no direct link to the original heat number, making mill test certificates unreliable. Welding procedures compiled against assumed mechanical properties fail during on-site NDT testing. Dimensional inaccuracies in wall thickness force contractors to redesign connection details, delaying project schedules by weeks. For EPC firms managing multi-country procurement, these gaps compound across shipments — one inconsistent batch can hold up an entire structural steel package. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How S355J0H RHS Matches Structural Frame Engineering Demands
S355J0H rectangular hollow section tubes deliver the yield strength class required for medium-to-large structural frames across industrial and commercial projects. The rectangular cross-section provides superior load-bearing efficiency compared to circular sections when bending occurs in a single plane — making these tubes the preferred choice for building columns, portal frame rafters, and curtain wall support systems. Our vertically integrated production line covers the full range from 15mm×20mm to 700mm×800mm with wall thickness up to 50mm, allowing project-specific section optimization without splitting orders across multiple suppliers. The S355J0H grade specifically addresses the 0°C impact toughness requirement common in temperate and cold-climate construction markets across the Middle East and Eastern Europe.
Structural Compliance and Surface Protection for Overseas Projects
Engineering codes such as EN 1993 and AISC 360 require verified material properties for structural hollow sections used in load-bearing applications. The S355J0H grade conforms to EN 10210 for hot-finished and EN 10219 for cold-formed hollow sections, providing the chemical composition and mechanical property documentation that European and Middle Eastern inspectors demand at customs and on site. For projects in coastal or industrial corrosion environments, hot-dip galvanized surface treatment extends service life significantly compared to black painting or bare finish. Our fabrication workshop offers CNC cutting, drilling, and welding per approved WPS procedures before shipment — reducing on-site rework and ensuring connection accuracy matches shop drawing coordinates. [NEED_CITE: steel grade equivalence mapping between EN 10210 S355J0H and ASTM A500 Grade C]
Understanding S355J0H Grade Selection and ERW Welding Process
The S-series steel grade system (S235, S275, S355) designates minimum yield strength in MPa for structural applications — S355J0H provides higher load capacity than S235 while maintaining weldability and formability for structural fabrication. The “J0” designation specifies Charpy impact testing at 0°C, distinguishing this grade from S355JR (tested at +20°C) for projects in colder climates. ERW (Electric Resistance Welded) production offers cost efficiency for standard wall thickness ranges up to 20mm, while seamless manufacturing covers the heavier wall thickness requirements for high-load structural nodes. Hot-dip galvanizing provides metallurgical zinc-iron bond layers that resist mechanical damage during transport and installation — critical for rectangular sections where corner edges are vulnerable to coating breakdown. Wall thickness tolerance of ±10% aligns with EN 10210 standards, though buyers should specify whether theoretical or actual weight calculation applies to their contract.
Hidden Costs of Sourcing S355J0H Rectangular Hollow Section Tubes Without Verified Documentation
Purchasing structural hollow sections without EN 10204 3.1 mill test certificates exposes projects to material rejection during third-party inspection — a common occurrence when steel grade markings do not match chemical analysis results. Negative tolerance exploitation beyond standard limits reduces actual load-bearing capacity below design calculations, creating structural safety risks that only surface during final engineering audits. Missing heat number traceability prevents proper welding procedure qualification, forcing costly re-welding of structural connections. For shipments to EU markets, lacking CE marking under EN 10210 or EN 10219 triggers customs holds that delay project timelines and incur storage demurrage charges. [NEED_CITE: structural steel procurement compliance requirements for international construction projects]
Why Project Procurement Teams Source S355J0H RHS From Our Integrated Facility
Our own steel mill with three production lines manufactures the raw material, then our dedicated fabrication division processes it into finished rectangular hollow section tubes — this vertical integration eliminates the material sourcing gap that plagues trading-company quotations. With 2,800+ specifications maintained in inventory, project teams can consolidate orders across multiple size ranges without splitting procurement between suppliers. Every shipment carries complete quality documentation: WPS, PQR, weld maps, dimensional inspection reports, and coating thickness measurements — prepared under one quality management system rather than assembled from disconnected sources. Our certified welding procedures and AWS/EN qualified welders handle custom fabrication including CNC cutting, drilling, bending, and assembly per engineering drawings. Professional loading plans for oversized rectangular sections prevent the transit damage that plagued my early career shipments to South American mining projects — we design lashing and blocking specific to RHS geometry and wall thickness. Third-party inspection through SGS or BV is available before shipment for buyers requiring independent verification.
Documentation & Compliance
- Mill Test Certificate (EN 10204 3.1) documenting S355J0H chemical composition including carbon, manganese, sulfur, phosphorus content and mechanical properties per EN 10210
- CE Certificate confirming compliance with EN 10210 for hot-finished structural hollow sections or EN 10219 for cold-formed sections, required for European market customs clearance
- ISO 9001 Quality Management System certificate covering the integrated production from raw steel manufacturing through fabrication and surface treatment
- SGS or BV Third-Party Inspection Report verifying dimensional accuracy, wall thickness measurement, and surface coating thickness before container sealing
- Material Traceability Documentation linking each S355J0H rectangular hollow section tube to its original heat number from our own steel mill production records
- Complete Export Documentation Package including packing list, bill of lading, certificate of origin, and fumigation certificate for destination country customs requirements
Packaging, Loading & Delivery
- S355J0H rectangular hollow section tubes bundled with galvanized steel strips at intervals calculated for the specific section dimensions and wall thickness, preventing bundle separation during crane handling
- Hot-dip galvanized RHS tubes packed with edge protectors and waterproof wrapping to preserve zinc coating integrity at corner edges during ocean transit to humid climate destinations
- Container loading plans optimized for 6m and 12m random length RHS sections, maximizing payload per 40ft container while maintaining weight distribution suitable for port handling equipment
- Custom cut-to-length service available for 11.8m and 12m sections to match specific project requirements, with cut ends protected by plastic caps and iron protectors against corrosion and mechanical damage
- Each bundle marked with heat number, steel grade S355J0H, section dimensions, and wall thickness for immediate site identification and traceability verification during installation
- Delivery terms available including FOB, CIF, and DDP to major ports across the Middle East, Southeast Asia, Africa, and Latin America with complete tracking documentation
Initiating Your S355J0H Rectangular Hollow Section Tube Inquiry
Submit your project drawings in PDF or DWG format along with required section dimensions, wall thickness, steel grade specification, and quantity to receive a detailed quotation within 24 hours. Our engineering team will review shop drawing requirements, confirm material availability from our 2,800+ specification inventory, and provide a production schedule including fabrication and surface treatment timelines. For projects requiring EN 1090 or ASTM compliance verification, specify the destination market and applicable standards in your inquiry to ensure documentation packages meet local inspection requirements.
Frequently Asked Questions
Q: What is the steel grade equivalence between S355J0H and ASTM A500?
A: S355J0H per EN 10210/EN 10219 corresponds approximately to ASTM A500 Grade C in terms of minimum yield strength, though chemical composition ranges differ between the European and American standards. Our mill test certificates provide full chemical and mechanical property data for cross-reference verification by your engineering team.
Q: Can you provide third-party inspection before shipment for S355J0H rectangular hollow section tubes?
A: Yes, SGS and BV third-party inspection services are available upon request. The inspection covers dimensional verification, wall thickness measurement, surface coating assessment, and visual weld quality examination. Inspection reports are issued before container sealing and included in the export documentation package.
Q: What surface treatment options are available for S355J0H RHS tubes?
A: Three surface treatment options are available: hot-dip galvanized for maximum corrosion protection in outdoor and coastal environments, black painting for indoor or temporary protection applications, and bare (uncoated) finish for projects where surface treatment will be applied locally after fabrication. Coating thickness inspection reports accompany galvanized and painted shipments.
Q: What is the minimum order quantity for custom non-standard S355J0H rectangular hollow section sizes?
A: Standard sizes from our 2,800+ specification inventory have no minimum order quantity restrictions. For custom non-standard dimensions or special length requirements, minimum order quantities apply based on production line setup considerations. Submit your specific requirements for quotation.
Q: How do you ensure material traceability for S355J0H tubes?
A: As a vertically integrated manufacturer with our own steel mill, every S355J0H rectangular hollow section tube is traceable from final product back to the original heat number through our complete production records. Mill test certificates reference specific heat numbers, and bundle markings include this traceability information for site verification.
Start Your S355J0H Rectangular Hollow Section Tube Procurement
Send your project specifications, section dimensions, and quantity requirements to receive a detailed quotation with mill test certificate samples and production timeline.
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
