This is enough to understand if the standard applies to you.
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It is important to understand that (Weldable structural steels for fixed offshore structures) is a copyrighted technical standard. Obtaining a "free download" of the full PDF through unofficial sites often carries risks, including malware or receiving outdated, incomplete versions of the document. en 10225-1 pdf free download
Specific requirements for S355, S420, S460, etc., tailored for offshore use.
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The 2019 edition significantly increased the maximum allowable thicknesses compared to the 2009 version. Steel Grade Category Delivery Condition Max Thickness (mm) Normalized (N) Up to 200 mm S355–S500MLO Thermomechanical Rolled (M) Up to 120 mm S420–S690QLO Quenched & Tempered (Q) Up to 150 mm Data source: ArcelorMittal Projects . Key Requirements for Compliance
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EN 10225:2001 (old version) sometimes circulates legally as an “historical standard.” It lacks CTOD and some S460 grades but covers basics.