EN 10225 is the definitive European standard for weldable structural steels in fixed offshore applications. Its four-part structure ensures that every form of steel—from heavy plates to complex sections and hollow sections—meets the demanding requirements of the marine environment. Understanding its grade designations, thickness limits, and mechanical properties is essential for engineers, fabricators, and procurement specialists.
Fixed offshore structures (not suitable for subsea pipelines or risers).
The governing body that creates the standard.
Could you clarify if you are looking for the or the environmental cooperation report ? ETSI TR 102 251 V1.1.1 (2003-10)
Dedicated to Cold-formed hollow sections . Core Technical Specifications & Grade Designations en 102251 pdf
Unauthorised free PDFs of EN 10225‑1 found on file‑sharing sites or non‑official document repositories are:
To summarize, if you are involved in offshore wind, oil and gas platforms, or marine structural engineering, your search should be for – not "en 102251 pdf." The typo is common, but the consequences of using the wrong standard can be catastrophic.
The 2019 version introduced several significant updates to accommodate deeper waters and harsher environments, including higher-strength grades and increased thickness limits. Steel Grade Series Maximum Standard Thickness Delivery Condition Up to 200 mm Normalized (+N) S355/420/460/500MLO Up to 120 mm Thermomechanically Rolled (+M) S420 to S690QLO Up to 150 mm Quenched and Tempered (+Q)
EN 10225‑1:2019 - Weldable structural steels for fixed offshore structures — Technical delivery conditions — Part 1: Plates EN 10225 is the definitive European standard for
EN 10225-1:2019 is a European Standard that outlines the technical delivery conditions for flat products made of steels for shipbuilding and other structural applications. The standard covers a range of steel grades, including those with improved weldability, high strength, and toughness. This paper provides an overview of the standard, its scope, and the technical requirements for the production and delivery of flat products made of steels for shipbuilding and other structural applications.
To ensure excellent weldability (low carbon equivalent), the standard places strict limitations on carbon (C), manganese (Mn), silicon (Si), and trace elements like phosphorus (P) and sulfur (S).
The standard provides detailed requirements for:
Yes. Part 1 includes providing informative guidance on prequalification of steels for fixed offshore structures operating in arctic areas. For temperatures below –40 °C, additional testing and specification may be required . Fixed offshore structures (not suitable for subsea pipelines
Offshore structures experience low ambient temperatures. EN 10225-1 requires mandatory Charpy V-notch impact testing at low temperatures, often at -20°C or -40°C, to ensure the steel remains ductile and does not crack under sudden impact or stress. 4. Through-Thickness Ductility (Z-Ordering)
| Steel Grade | Steel Name Explanation | Maximum Thickness | Delivery Condition | | :--- | :--- | :--- | :--- | | | S = Structural steel, 355 = Min. yield strength (MPa), N = Normalized, L = Low temperature, O = Offshore | 200 mm | Normalized | | S355MLO | M = Thermomechanically rolled | 120 mm | Thermomechanical | | S420MLO | 420 = Min. yield strength (MPa) | 120 mm | Thermomechanical | | S460MLO | 460 = Min. yield strength (MPa) | 120 mm | Thermomechanical | | S500MLO | 500 = Min. yield strength (MPa) | 120 mm | Thermomechanical | | S420QLO | Q = Quenched and tempered | 150 mm | Quenched & Tempered | | S460QLO | ... | 150 mm | Quenched & Tempered | | S500QLO | ... | 150 mm | Quenched & Tempered | | S550QLO | ... | 150 mm | Quenched & Tempered | | S620QLO | ... | 150 mm | Quenched & Tempered | | S690QLO | ... | 150 mm | Quenched & Tempered |
Identify the design temperature (e.g., -10°C for Southern North Sea vs. -30°C for Norwegian Sea). Choose G8, G10, or G12 accordingly.
The 2019 revision brought significant updates to the offshore industry. The primary upgrades to check when downloading an EN 10225-1 PDF include: BS EN 10225:2001 Incorporating - Corrigendum No. 1