The 2019 edition updated steel names to align with EN 10027-1 . Normalized or normalized rolled. S420MLO, S460MLO, S500MLO: Thermomechanically rolled (+M). S420QLO to S690QLO: Quenched and tempered (+Q). Thickness Limitations
is the definitive European standard specifying the technical delivery conditions for weldable structural steel plates used in the fabrication of fixed offshore structures . Primarily tailored for the North Sea environment, this standard ensures that materials can withstand extreme mechanical stress and corrosive marine conditions. en 10225-1 pdf
: Material grades with yield strengths up to 690 MPa . 🏗️ Key Steel Grades and Designations The 2019 edition updated steel names to align
Fixed offshore structures—platforms, jackets, and subsea templates—are among the most demanding environments for steel. EN 10225-1:2019 provides the rigorous framework necessary to ensure these structures survive decades of corrosive salt spray and extreme mechanical stress. ⚓ Core Scope and Applicability S420QLO to S690QLO: Quenched and tempered (+Q)
: The standard is now split into 4 parts (Plates, Sections, Hot Finished Hollow Sections, and Cold Formed Hollow Sections).
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.