The document defines image quality values for ferrous metals for wire type IQI according to EN 462-1 and for step/hole IQI according to EN 462-2 in order to ensure a uniform radiographic quality.
EN 462-3:1996 history
1996EN 462-3:1996 Non-Destructive Testing - Image Quality of Radiographs - Part 3: Image Quality Classes for Ferrous Metals