EN 10225 — Weldable structural steel for marine structures
Grades
S235G2, S275G2, S355G2, S355G3, S355G4, S355G5, S355G6, S355G7, S355G8, S355G9, S355G10, S355G11, S420G2, S420G3, S460G2, S460G3
Chemical composition and mechanical properties
| Grade | Chemical composition | Mechanical properties |
|---|---|---|
| S235G2 | C≤0.18, Mn≤1.40, Si≤0.40, P≤0.020, S≤0.015, Al≥0.015, Nb≤0.05, V≤0.06, Ti≤0.03, N≤0.010 | Rm 360-490 MPa, Rp0.2 ≥235 MPa, A≥24%, Akv≥50J at -20℃, marine corrosion resistant |
| S275G2 | C≤0.18, Mn≤1.50, Si≤0.40, P≤0.020, S≤0.015, Al≥0.015, Nb≤0.05, V≤0.06, Ti≤0.03, N≤0.010 | Rm 410-540 MPa, Rp0.2 ≥275 MPa, A≥22%, Akv≥50J at -20℃, marine corrosion resistant |
| S355G2 | C≤0.18, Mn≤1.60, Si≤0.50, P≤0.020, S≤0.015, Al≥0.015, Nb≤0.05, V≤0.10, Ti≤0.03, N≤0.010 | Rm 460-580 MPa, Rp0.2 ≥355 MPa, A≥22%, Akv≥50J at -20℃, marine corrosion resistant |
Application scope
EN 10225 specifies weldable structural steel plates for fixed and floating offshore structures. This series also covers sections and bars, with grades including S235, S275, S355, S420, S460, and various delivery quality levels. The standard emphasizes excellent low-temperature impact toughness, weldability, and marine corrosion resistance, specifying composition and mechanical properties. Approved by the relevant system, it is suitable for load-bearing structures in marine engineering.
Typical applications
Widely used in load-bearing components of marine engineering structures such as offshore oil platforms, jacket foundations, offshore wind turbine foundation piles and towers. Grades are classified according to strength and delivery quality, allowing for selection based on stress, plate thickness, and marine environment. With excellent low-temperature toughness, weldability, and resistance to seawater corrosion, it is suitable for fixed and floating marine engineering structures that withstand long-term wind, waves, and low temperatures, and are primarily welded.
