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This article serves as a comprehensive guide to everything you need to know about EN 10225-1:2019, including its scope, the key steel grades it defines, its critical mechanical property requirements, and where to legally obtain the latest official PDF version.
Disclaimer: This article is for informational purposes. Always refer to the official EN 10225-1:2019 document for legal and engineering compliance.
The Definitive Guide to EN 10225-1: Welded Structural Steels for Fixed Offshore Structures
Unlike standard structural steels, EN 10225-1 often mandates CTOD testing on the heat-affected zone (HAZ) of welds to simulate real-world structural fatigue and crack propagation resistance. 3. Through-Thickness Properties (Z-Testing) en 10225-1 pdf
Measures the steel's toughness and resistance to brittle fracture. For offshore applications, these tests are frequently conducted at extreme temperatures, such as -40°C or -50°C.
Whether you are building a transition piece for a wind turbine or a jacket for an oil platform, the is your bible for metallic materials. Purchase it, study it, and weld by it.
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| | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Energy @ -20°C (J) | | :--- | :--- | :--- | :--- | :--- | | S355G2+N | ≥ 355 | 470–630 | ≥ 22 | ≥ 40 | | S355G3+N | ≥ 355 | 470–630 | ≥ 22 | ≥ 40 | | S355G5+M | ≥ 355 | 470–610 | ≥ 22 | ≥ 40 | | S355G8+M | ≥ 355 | 470–610 | ≥ 22 | ≥ 40 |
| Steel Grade Group | Delivery Condition (Symbol) | Maximum Thickness (mm) | | :--- | :--- | :--- | | S355NLO | Normalized rolled (N) | | | S355MLO, S420MLO, S460MLO, S500MLO | Thermomechanical rolled (M) | 120 mm | | S420QLO, S460QLO, S500QLO, S550QLO, S620QLO, S690QLO | Quenched and tempered (Q) | 150 mm |
EN 10225-1:2019 defines technical delivery conditions for weldable structural steel plates used in fixed offshore structures, covering grades from normalized S355NLO to quenched & tempered S690QLO. The 2019 revision introduces stricter requirements, including higher strength grades and specific guidance for Arctic service, with mandatory EN 10204 3.1 certification. View technical data sheets and summaries at ArcelorMittal Projects EVS-EN 10225-1:2019 - EVS standard evs.ee | en The Definitive Guide to EN 10225-1: Welded Structural
The steel is heated to a specific temperature to refine its grain structure, improving toughness.
The standard covers weldable structural steels in the form of up to 150 mm thick (though greater thicknesses can be agreed upon). It is specifically designed for:
Guidelines on permissible deviations in thickness, flatness, and length are outlined to ensure precision during heavy fabrication.