S355J2+N is the normalized version of S355J2, the most widely specified structural steel grade in the European EN 10025 family and increasingly adopted in international projects outside Europe. The plus N suffix indicates normalizing heat treatment, which refines grain structure, improves through-thickness toughness, and guarantees mechanical properties uniformly across the full plate thickness. At Huaxia Steel, we stock and produce S355J2+N plates from 5 mm to 200 mm thickness in widths up to 4000 mm, with mill-direct pricing, EN 10204 3.1 certification, and comprehensive processing services.
Product Overview
S355J2+N plate is specified for bridges, buildings, offshore structures, pressure vessels, and heavy machinery where the combination of high yield strength, good weldability, and guaranteed low-temperature toughness is essential. The J2 designation guarantees minimum 27 Joules Charpy V-notch impact energy at minus 20 degrees Celsius, making this grade suitable for outdoor and unheated structures in temperate and cold climates where brittle fracture must be prevented.
Our plates are produced by thermo-mechanical controlled rolling or normalizing from continuous cast slabs. Normalizing is performed in walking-beam furnaces with automatic temperature profiling and controlled air cooling. All plates are roller leveled, edge trimmed, and ultrasonically tested to EN 10160 for internal soundness.
Specifications and Dimensions
| Parameter | Specification |
|---|---|
| Material Standard | EN 10025-2 |
| Steel Grade | S355J2+N (material number 1.0577+N) |
| Thickness Range | 5 mm to 200 mm |
| Width Range | 1500 mm, 2000 mm, 2500 mm, 3000 mm, 4000 mm |
| Length Range | 3000 mm to 18000 mm; cut-to-length available |
| Edge Condition | Mill edge, sheared edge, gas-cut edge |
| Surface Finish | As-rolled, shot-blasted, primed with epoxy or zinc-rich primer |
| Flatness Tolerance | EN 10029 Class N (normal) or Class S (special) |
Mechanical and Chemical Properties
| Property | Value (t less than or equal to 40 mm) | Value (40 mm less than t less than or equal to 400 mm) |
|---|---|---|
| Yield Strength (minimum) | 355 MPa | 345-275 MPa (decreasing with thickness) |
| Tensile Strength | 470-630 MPa | 470-630 MPa |
| Elongation (minimum) | 22% | 20% |
| Charpy V-notch (minimum) | 27 J at minus 20 degrees C | 27 J at minus 20 degrees C |
| Carbon (maximum) | 0.22% | 0.22% |
| Manganese (maximum) | 1.60% | 1.60% |
| Silicon (maximum) | 0.55% | 0.55% |
| Phosphorus (maximum) | 0.025% | 0.025% |
| Sulfur (maximum) | 0.025% | 0.025% |
Manufacturing and Quality Control
Our S355J2+N plates are manufactured at ISO 9001 and ISO 14001-certified mills with comprehensive process controls at every stage:
- Continuous casting — Slabs are cast with electromagnetic stirring and dynamic soft reduction to minimize center segregation and internal porosity.
- Controlled rolling — Thermo-mechanical rolling in the austenite recrystallization and controlled cooling zones develops fine ferrite grain structure for optimal toughness.
- Normalizing — Reheating to 890-940 degrees Celsius followed by controlled air cooling to achieve uniform ferrite-pearlite microstructure through the full cross-section.
- Ultrasonic testing — One hundred percent lamination scanning per EN 10160 Class S1/E1 for plates 10 mm and thicker.
- Mechanical testing — Tensile test, Charpy V-notch impact test in longitudinal and transverse directions, and through-thickness Z-direction test where specified.
- Dimensional inspection — Automated thickness gauge mapping, width and length verification, edge squareness measurement, and flatness checking.
Supplemental requirements available on request include through-thickness property testing at Z15, Z25, or Z35 levels; enhanced ultrasonic inspection to EN 10160 Class S2/E2; Charpy impact testing at minus 30 degrees Celsius or minus 40 degrees Celsius for arctic service; and carbon equivalent restriction for improved weldability in field fabrication.
Applications
- Bridge decks, main girders, cross-girders, and bearing plates
- Building columns, beams, moment connection plates, and base plates
- Offshore platform jacket legs, braces, and deck module framing
- Wind turbine tower sections, transition pieces, and foundation rings
- Pressure vessels, storage tanks, and spherical tanks
- Earthmoving equipment, mining machinery, and quarry plant
- Crane booms, jibs, and crawler undercarriages
- Railway rolling stock, wagons, and bridge bearings
Processing Services
In addition to as-rolled plate delivery, we offer comprehensive value-added processing:
- Flame and plasma cutting — Complex shapes, bevels, cut-outs, and bolt holes to your CAD drawing or DXF file
- CNC machining — Milling, drilling, tapping, and countersinking of connection plates and weldments
- Shot blasting and priming — SA 2.5 surface preparation with epoxy primer or zinc-rich primer for corrosion protection during construction
- Roller leveling and stress relieving — Precision leveling and post-weld heat treatment for distortion-sensitive fabricated components
- Plate rolling and forming — Cylindrical shells, cones, and curved sections for vessel and duct fabrication
Packaging and Shipping
Plates are stacked on timber bearers, secured with multiple steel banding straps, and protected by waterproof cover sheets and edge protectors. Each bundle is clearly marked with heat number, grade designation, dimensions, net weight, and applicable standard. Maximum bundle weight is 10 tons for safe lifting with standard harbor cranes. We ship FOB Chinese port, CIF, DAP, or DDP with complete export documentation including Mill Test Certificate, mill certificate of compliance, and third-party inspection reports where applicable.
Request your S355J2+N plate quotation — specify thickness, width, length, quantity, and any processing or supplemental testing requirements. Our technical sales team will confirm mill rolling schedule, normalizing availability, and delivery timing within 24 hours. Get a quote now.
Welding and Fabrication Guidelines
S355J2+N is weldable with conventional processes. Typical preheat requirements:
| Thickness (mm) | Preheat at 0C ambient | Preheat below 0C ambient |
|---|---|---|
| Up to 20 | None | 20C |
| 20-40 | None | 50C |
| 40-60 | 50C | 75C |
| Over 60 | 75C | 100C |
Recommended filler metals: GMAW — ER70S-6; SMAW — E7018; SAW — EM12K + neutral flux. For thick sections and high restraint, low-hydrogen electrodes and controlled interpass temperatures are essential.
Why Buy from Huaxia Steel?
We stock over 15,000 tons of S355J2+N plate in standard sizes for immediate shipment. For non-standard dimensions, our mill partnerships offer rolling schedules as short as 3 weeks. Our in-house processing center can cut, drill, mill, blast, and prime your plates before delivery, reducing your fabrication time and handling cost.
Quality Assurance and Testing
Quality is not an afterthought at Huaxia Steel — it is embedded in every stage of production from raw material selection to final inspection. Our quality management system is certified to ISO 9001:2015 and audited annually by accredited certification bodies.
Key quality control steps include incoming material verification, in-process dimensional checks, non-destructive testing at critical stages, final inspection against customer specifications, and pre-shipment review of documentation completeness. Test equipment is calibrated to national standards with full traceability.
Customization and Special Requirements
Beyond standard specifications, we accommodate special requirements that make your project successful:
- Custom lengths, tolerances, and surface finishes
- Special marking, color coding, and bar coding
- Additional testing beyond standard requirements
- Third-party witness and certification
- Consolidated shipping with other materials
- Warehousing and call-off delivery programs
Our engineering team reviews every special requirement for manufacturability and provides feedback on lead time and cost impact before order confirmation.
Global Delivery and Logistics
We ship to over 60 countries across six continents. Our logistics team coordinates with major shipping lines to secure competitive freight rates and reliable vessel schedules. Container loading is supervised by our staff to ensure proper stowage, lashing, and damage prevention.
Standard delivery terms include FOB Chinese main port, CIF destination port, DAP named place, and DDP delivered duty paid. We handle all export documentation including commercial invoice, packing list, bill of lading, certificate of origin, and Mill Test Certificate. For countries requiring pre-shipment inspection, we coordinate with SGS, Intertek, or Bureau Veritas at the loading port.
Contact us today for your specific requirements. Our technical sales team is ready to assist with specification review, material selection, and project pricing. Request a quotation.
Technical Support and Engineering Services
Our technical team includes metallurgists, welding engineers, and structural specialists who support customers throughout the project lifecycle. Services include material selection guidance, weld procedure development, corrosion assessment, failure analysis, and specification review.
For large projects, we assign a dedicated project manager who coordinates production scheduling, quality planning, inspection booking, and logistics. This single point of contact simplifies communication and ensures nothing falls through the cracks.
Compliance and Certification
Our manufacturing facilities hold multiple certifications to meet global market requirements:
- ISO 9001:2015 Quality Management System
- ISO 14001:2015 Environmental Management System
- ISO 45001:2018 Occupational Health and Safety
- API Q1 Quality Management System for Oil and Gas
- CE Marking per EN 1090 for structural steel
- ASME U and U2 Stamp for pressure equipment
We maintain comprehensive product liability insurance and professional indemnity coverage. Our quality records are retained for 15 years, ensuring full traceability for the service life of your project.
Customer Success Stories
Over the past decade, we have supplied carbon steel products to major projects across five continents. Recent highlights include a 5,000-ton bridge project in Africa, a petrochemical expansion in the Middle East, a renewable energy framework in Latin America, and multiple infrastructure projects in Southeast Asia.
Our customers consistently cite three reasons for choosing Huaxia Steel: competitive mill-direct pricing that reduces material costs by 10-20%, reliable on-time delivery that keeps construction schedules on track, and responsive technical support that solves problems before they become crises.
We measure success not by tons shipped, but by projects completed successfully and relationships built for the long term. Every order, regardless of size, receives our full attention and commitment to excellence.
How to Order
Getting started is simple. Send us your technical specification or bill of materials, including grade, dimensions, quantities, standards, and delivery requirements. Our team will review for completeness, suggest alternatives if beneficial, and provide a detailed quotation within 24 hours.
For first-time customers, we offer trial orders at competitive minimum quantities to establish quality confidence before larger commitments. We accept payment by wire transfer, letter of credit, and documentary collection depending on order value and customer preference.
Contact us today to discuss your project requirements and discover why buyers worldwide trust Huaxia Steel as their carbon steel supplier. Request a quotation.
