S355J2 Structural Steel: High-Strength European Grade
EN 10025-2:2019 · Updated: 2026-05-23
S355J2 is the most specified high-strength carbon structural steel in European construction, with 355 MPa minimum yield strength and guaranteed Charpy V-notch impact toughness of 27 Joules at -20°C. The J2 designation ensures reliable performance in cold climates without brittle fracture risk. Used extensively in bridges (including the Øresund Bridge), offshore wind turbine foundations, high-rise building frames, and heavy machinery. It welds with matching-strength electrodes (E7018 or equivalent) and requires preheat only above 30 mm thickness.
Quick Facts
| Category | Carbon Steel |
| Standard | EN 10025-2:2019 |
| Density | 7.85 g/cm³ |
| Yield Strength | 355 MPa (51 ksi) |
| Tensile Strength | 470-630 MPa (68-91 ksi) |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| ASTM A572 Gr50 | Compare |
| Q355D | Compare |
| SM490 | Compare |
| St52-3 | Compare |
| E355 | Compare |
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Frequently Asked Questions
How does S355 compare to S275 for cost-effectiveness?
S355 is approximately 8-12% more expensive per ton than S275 but delivers 29% higher yield strength. For strength-governed designs, S355 typically reduces total structural weight by 15-25%, resulting in net cost savings. For stiffness-governed designs (deflection limits), S275 may be more economical since both grades have identical elastic modulus (210 GPa).