The document specifies a method of converting room temperature percentage elongations after fracture obtained on various proportional and non-proportional gauge length to other gauge lengths.
DIN EN ISO 2566-2:1999 history
2022DIN EN ISO 2566-2:2022-10 Steel - Conversion of elongation values - Part 2: Austenitic steels (ISO 2566-2:2021, Corrected version 2022-05); German version EN ISO 2566-2:2021