S355J2 (EN 10025) looks similar to S355G10 (EN 10225-1). However, EN 10025 steel lacks the mandatory fracture toughness in the through-thickness direction. Using EN 10025 on a crane pedestal in the North Sea will result in catastrophic lamellar tearing.
Offshore structures often use heavy plates where stress is applied perpendicular to the surface. This can lead to lamellar tearing. The standard defines requirements for "Z-quality" (Z25, Z35), ensuring the steel has high ductility through its thickness, preventing catastrophic failure in critical nodes and joints. en 10225-1 pdf
Materials must maintain impact properties at temperatures as low as -40 °C , making them suitable for harsh climates . S355J2 (EN 10025) looks similar to S355G10 (EN 10225-1)