Description
Factory-direct pricing with no middlemen — every S355J2H seamless square and rectangular steel tube rolls from our own production lines, backed by original mill test certificates and CE/EN compliance documentation.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S355JRH/J0H/J2H/K2H/NH Seamless Square and Rectangular Steel Tube |
| Product Type | Seamless Square and Rectangular Steel Tube / Hollow Section (SHS/RHS) |
| Steel Grade | S355JRH, S355J0H, S355J2H, S355K2H, S355NH, S460, S690 |
| Standard | EN10210, EN10219 |
| Section Shape | Square / Rectangular |
| Technique | Seamless Manufacturing Process |
| Surface Treatment | Hot Rolled |
| Tolerance | ±1% |
| Special Pipe | Thick Wall Pipe |
| Surface | Smooth |
| Oiled or Non-oiled | Non-oiled |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Invoicing | By Theoretical Weight |
| Packing | Standard Seaworthy Packing |
| Application | Steel structures, Heavy-duty engineering, Extreme construction environments, Outdoor infrastructure projects, Bridge/Highway/Port/Stadium construction, Glass curtain wall framing and facade system, High-rise building and steel frame structure, Prefabricated building and modular structure, Industrial framing and support |
| MOQ | 10 Tons |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Heavy Infrastructure | Bridge trusses, highway gantry frames, port crane booms, stadium roof support systems |
| High-Rise Construction | Steel frame columns, glass curtain wall mullions, facade anchoring structures |
| Modular & Prefabricated Buildings | Prefab column-beam joints, modular unit framing, transportable structure skeletons |
| Industrial Engineering | Heavy machinery frames, conveyor support structures, industrial platform framing |
| Outdoor Infrastructure | Transmission tower bases, lighting pole foundations, noise barrier support frames |
What Dimensional Tolerance Costs on a Structural Frame Order
±1% tolerance on seamless S355J2H tubes eliminates on-site rework and connection failures.
When structural hollow sections arrive with wall thickness variation beyond acceptable limits, bolt holes misalign, weld joints crack under load, and entire frame sections need replacement. I have seen project teams lose weeks waiting for replacement tubes because the original batch failed dimensional checks at the erection stage. Sourcing an EN10210 S355J2H seamless square and rectangular steel tube supplier who controls tolerance at the rolling stage — not just at final inspection — prevents these cascading delays. [NEED_CITE: EN 10210 dimensional tolerance requirements for hot-finished structural hollow sections]
Matching Heavy-Duty Structural Demands in Extreme Environments
Seamless S355J2H hollow sections deliver uniform wall thickness and consistent mechanical properties across the full cross-section, making them suitable for load-bearing frames in bridges, ports, and stadiums where impact resistance and structural stability matter. The seamless manufacturing process eliminates weld seam weaknesses that can propagate under cyclic loading or low-temperature conditions. Our production lines run S355JRH through S355NH sub-grades plus HSLA options like S460 and S690, covering everything from standard building frames to extreme-environment infrastructure. Each EN10210 S355J2H seamless square and rectangular steel tube supplier order ships with heat-number traceability so engineers can verify material origin before erection begins.
Engineering Compliance and Certification Requirements
Structural hollow sections for European market projects must conform to EN 10210 for hot-finished seamless products, with CE marking and Factory Production Control certification required for customs clearance and site acceptance. [NEED_CITE: CE marking requirements for structural steel products under EN 10210] Steel grade selection directly affects design load calculations — S355J2H provides guaranteed impact toughness at -20°C, while S355NH offers normalized condition for improved weldability in thick-wall applications. Third-party inspection through SGS or BV confirms chemical composition and mechanical properties before shipment, preventing compliance failures at destination ports. Custom cut-to-length and pre-drilling services reduce on-site secondary processing, keeping projects on schedule.
Steel Grade Selection and Seamless Manufacturing Advantages
The S355 grade family covers multiple sub-grades — JRH for ambient conditions, J0H for -20°C impact requirements, J2H for -20°C with higher toughness, K2H for -20°C with enhanced impact energy, and NH for normalized delivery with improved weldability. Choosing the correct sub-grade matters: specifying J2H instead of JRH for a cold-climate bridge project prevents brittle fracture risk under winter loading conditions. [NEED_CITE: steel grade selection criteria for low-temperature structural applications] Seamless manufacturing produces tubes with uniform grain structure around the full circumference, delivering better fatigue resistance and pressure containment than welded alternatives. Hot-rolled surface finish provides clean weld prep without oil contamination, while ±1% dimensional tolerance ensures consistent fit-up for bolted and welded connections.
Hidden Costs of Incorrect Material Sourcing
Ordering structural tubes without verified mill test certificates risks customs seizure, project rejection, or structural failure under load. Material substitution — receiving S275 instead of S355, or ERW instead of seamless — may pass visual inspection but fails under engineering scrutiny when traceability documents do not match purchase specifications. Negative tolerance abuse reduces actual wall thickness below design minimums, compromising load capacity while invoicing by theoretical weight masks the material shortfall. [NEED_CITE: consequences of negative tolerance abuse in structural steel procurement] An EN10210 S355J2H seamless square and rectangular steel tube supplier providing original MTC with heat-number traceability eliminates these risks before steel reaches the job site.
Why Project Buyers Source Direct from Our Mills
We manufacture EN10210 S355J2H seamless square and rectangular steel tube products on three dedicated production lines with monthly capacity exceeding 20,000 tons, eliminating broker markups and enabling volume-based pricing for repeat buyers. Our in-house metallurgical lab conducts three-stage inspection — incoming raw material, in-process dimensional checks, and final mechanical testing — before any batch receives our mill test certificate. With 2,800+ specifications in ready stock, standard sizes ship within days while custom dimensions and non-standard lengths complete production within typical lead times. Every EN10210 S355J2H seamless square and rectangular steel tube supplier order includes CE certification per EN10210/EN10219, ISO 9001:2015 quality management, and FPC factory production control documentation required for European market compliance. Third-party inspection through SGS, BV, or Lloyd’s registers available on request provides independent verification for projects requiring external quality confirmation.
Documentation & Compliance
- Mill test certificate documenting S355J2H chemical composition and mechanical properties per EN10210, traceable to original heat number
- CE certificate confirming EN10210/EN10219 compliance for hot-finished seamless structural hollow sections
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying dimensional accuracy and material properties before shipment
- Material traceability documentation linking each tube to specific heat number and production batch
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Seamless S355J2H thick-wall tubes bundled with steel strips and edge protectors to prevent surface damage during ocean transit
- Hot-rolled smooth surface tubes shipped non-oiled with moisture protection wrapping to maintain clean weld prep condition
- Container loading optimized for square and rectangular section nesting, maximizing weight utilization for heavy-wall specifications
- Cut-to-length service available for custom sizes, with bundled packaging matching project delivery sequence requirements
- Heat number and steel grade markings stenciled on each tube end for on-site identification and traceability verification
- FOB, CIF, and DDP shipping options with professional export documentation handling for destination country customs clearance
Starting Your S355J2H Procurement
Submit your project specifications — section dimensions, wall thickness, steel grade sub-type, quantity, and destination port — to receive competitive factory-direct pricing with volume discounts and delivery schedule confirmation. Our engineering team reviews requirements within hours and provides mill test certificate samples plus CE/EN compliance documentation for your project approval process.
Request Factory-Direct Pricing with Full Compliance Documentation
Email your inquiry to admin@sdxinjiyuan.com or contact via WhatsApp at +86 188 5315 7756 with specifications and quantity for immediate quotation.
Frequently Asked Questions
Q: How do S355J2H (EN) and ASTM A500 Grade C compare for structural applications?
A: S355J2H per EN10210 and ASTM A500 Grade C serve similar structural purposes but differ in testing requirements and certification. S355J2H mandates Charpy impact testing at -20°C, while ASTM A500 Grade C focuses on room-temperature mechanical properties. Substitution requires engineering approval confirming both chemical composition and mechanical property compatibility for your specific design conditions.
Q: What mill test certificates accompany each shipment?
A: Every batch ships with original mill test certificates documenting chemical composition, yield strength, tensile strength, elongation, and impact test results per EN10210 requirements. Certificates include heat number traceability linking each tube to its production batch. Third-party inspection through SGS or BV available upon request provides independent verification.
Q: What is the minimum order quantity for custom dimensions?
A: Standard specifications ship from ready stock with 10-ton minimum order quantity. Custom non-standard dimensions and special lengths require production scheduling with typical lead times depending on specification complexity. Contact our team with your exact requirements for specific MOQ and delivery timeline confirmation.
Q: How does theoretical weight invoicing work with tolerance specifications?
A: Invoicing by theoretical weight calculates based on nominal dimensions and standard steel density per EN10210 formulas. Our ±1% dimensional tolerance ensures actual weight stays within acceptable range of theoretical calculation. Mill test certificates document actual measured dimensions for verification against purchase specifications.
Q: Can you provide surface treatment options beyond hot-rolled finish?
A: Hot-rolled smooth non-oiled surface is standard for S355J2H seamless tubes, providing clean weld prep condition. Galvanized coating and other surface treatments available for outdoor infrastructure applications requiring corrosion protection. Specify your environmental conditions and service life requirements for appropriate surface treatment recommendation.
