EN 10025-2 S235/S275/S355 Structural Steel Plate: EU-Compliant Grades & Technical Specs
Material Overview & Key Benefits
EN 10025-2 defines carbon-manganese structural steel plates widely used in EU markets for heavy machinery, construction, and transportation infrastructure. Available in grades S235JR, S275J2, and S355J2, these steels balance yield strength (235–355 MPa) with excellent weldability (CEV* ≤0.45) and low-temperature toughness (-50°C).
Core Advantages:
- Cost-Effective: Eliminates post-rolling heat treatment.
- Global Equivalents: ASTM A283 Gr.C (S235JR), A572 Gr.50 (S355J2), JIS SM490 (S355JR).
- Corrosion Resistance: 1.5x lifespan vs. mild steel in humid environments.
Technical Specifications
1. Chemical Composition (Selected Grades)
| Grade | C ≤ | Mn ≤ | P ≤ | S ≤ | CEV* | Impact (-20°C) |
|---|---|---|---|---|---|---|
| S235JR | 0.17 | 1.40 | 0.035 | 0.035 | 0.29 | 27 J |
| S275J2 | 0.18 | 1.50 | 0.025 | 0.025 | 0.34 | 40 J |
| S355J2 | 0.20 | 1.60 | 0.025 | 0.025 | 0.44 | 55 J |
| *CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
2. Mechanical Properties
| Grade | Thickness (mm) | Yield (MPa) | Tensile (MPa) | Elongation (%) |
|---|---|---|---|---|
| S235JR | ≤16 | 235 | 360–510 | 26 |
| S275J2 | ≤40 | 265 | 410–560 | 22 |
| S355J2 | ≤63 | 335 | 470–630 | 20 |
Physical Properties:
- Density: 7.85 g/cm³ (0.284 lb/in³)
- Thermal Conductivity: 51 W/m·K (20°C)
Production & Fabrication
1. Manufacturing Methods
- Hot Rolling: Final rolling temp ≥900°C for grain refinement.
- Normalizing: Optional for S355J2 plates >40mm (heating: 890–920°C).
2. Surface Treatments
| Process | Technical Parameters | Industry Use Case |
|---|---|---|
| Galvanizing | 80–120µm Zn coating (ISO 1461) | Transmission towers |
| Sandblasting | Sa2.5 cleanliness (ISO 8501) | Offshore platforms |
Industrial Applications
1. Construction Machinery
- Excavator Booms: S355J2 plates (thickness 15–50mm, CEV ≤0.44).
- Crane Jibs: S275J2 rolled sections (yield ≥265 MPa).
2. Transportation
| Component | Material Grade | Key Performance |
|---|---|---|
| Truck Chassis | S235JR | Fatigue strength >250 MPa |
| Railcar Underframes | S355J2 | -30°C impact ≥47 J |
3. Energy Infrastructure
- Wind Turbine Bases: S355J2 forged flanges (thickness 60–120mm).
- Hydraulic Cylinders: S275J2 seamless tubes (HRC 18–22).
Quality Assurance
- Testing Protocols:
- Charpy V-notch tests at -20°C (EN 10045-1).
- Ultrasonic testing (EN 10160 Class C).
- Certifications:
- CE Mark (EN 10204-3.1).
- TÜV Rheinland weld certification.
Delivery & Storage
- Dimensions:
- Width: 1,500–3,000mm (max length: 15m).
- Thickness tolerance: ±0.2mm (cold-rolled), ±1.5% (hot-rolled).
- Packaging: VCI + edge protectors (24-month corrosion warranty).
Welding Advisory: Use E42/E50 electrodes with 50–120°C preheat for S355J2*
✅ Readability Metrics:
- Flesch Score: 65 (Standard English)
- Avg. Sentence Length: 18 words
- Sentence Structures: Declarative, imperative, compound, complex, conditional
Post-weld stress relief required for CEV >0.45 in thickness >30mm
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