: Through-thickness testing is now mandatory for materials starting at 15 mm (previously 25 mm).
| | Meaning & Example | | :--- | :--- | | Prefix (S) | Structural steel | | Yield Strength | Minimum yield strength in MPa (e.g., 355 in S355MLO, 420 in S420MLO) | | Delivery Condition | N : Normalized rolled; M : Thermomechanically rolled; Q : Quenched and tempered | | Offshore Use (O) | Indicates the steel is specifically intended for offshore applications | | Low Temperature (L) | Confirmed low-temperature properties |
When selecting steel for a project, the grade must be carefully chosen based on the specific requirements of the application: en 10225-1 pdf
Default thickness limits have increased in the 2019 version: Steel Grade Type Maximum Thickness (mm) MLO Grades (S355–S500) QLO Grades (S420–S690) Key Changes in the 2019 Edition
The Essential Guide to EN 10225-1: Technical Requirements for Weldable Structural Steels in Offshore Structures : Through-thickness testing is now mandatory for materials
This standard focuses on high-strength steel grades designed to withstand the harsh conditions of the offshore sector, primarily the North Sea.
One of the defining features of EN 10225-1 is mandatory CTOD testing for specific high-criticality grades and thicknesses. CTOD testing measures the resistance of the steel and its heat-affected zone (HAZ) to fracture propagation in the presence of a preexisting crack. This simulates real-world fatigue and stress conditions on an offshore rig. 4. Through-Thickness Tensile Testing (Z-Testing) CTOD testing measures the resistance of the steel
If you are searching the internet for a , you have likely hit a wall. Unlike general consumer standards, EN 10225-1 is a copyrighted document managed by national standards bodies like BSI (British Standards Institution), DIN (Germany), or AFNOR (France).
Building structures that can survive the brutal conditions of the open ocean—pounding waves, corrosive saltwater, and freezing temperatures—requires more than just standard steel. For engineers and fabricators in the offshore sector, is the definitive standard for the weldable structural steel plates used to build fixed offshore structures like oil platforms and wind farm foundations . What is EN 10225-1?
The steel is heated to a specific temperature and cooled in still air to refine the grain structure.
Inspection teams use the document to verify Mill Test Certificates (MTCs) against the standard's rigorous chemical and mechanical thresholds. How to Access the Standard Legally