If you operate internationally, ISO 683-14 is more globally recognized. It includes many of the same steel grades (e.g., 51CrV4, 55Cr3).
While it has been officially by modern European standards like DIN EN 10222 and DIN EN 10273 , it remains a common reference in legacy engineering projects and the supply of older components like high-temperature flanges. Core Technical Focus din 17243 pdf