EN 10225 — Weldable structural steel for marine structures (pipeline accessories)
Grades
S235G2, S275G2, S355G2, S355G3, S355G6, S355G8, S355G10, S420G2, S460G2
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 is a European standard for weldable structural steel for fixed and floating offshore structures, covering steel plates, sections, and bars, with grades designated as strength levels such as S355G2. The standard emphasizes low-temperature impact toughness, weldability, and properties in the thickness direction, and requires marine corrosion resistance, making it suitable for load-bearing structures such as offshore platforms, pipeline supports, and wind turbine foundations.
Typical applications
Primarily used in load-bearing components of offshore oil platforms, pipeline support structures, offshore wind turbine foundation piles, and jacket structures, where they are subjected to low temperatures and seawater corrosion. Grades are classified by strength, and various plates and sections of steel can be combined to form platform frames. With excellent low-temperature toughness, weldability, and marine corrosion resistance, it is suitable for marine engineering structures requiring high safety standards and resistance to low-temperature brittle fracture and corrosion.
