DIN EN ISO 643:2023-08
钢 - 表观晶粒尺寸的显微测定（ISO/DIS 643:2023）
Steels - Micrographic determination of the apparent grain size (ISO/DIS 643:2023); German and English version prEN ISO 643:2023 / Note: Date of issue 2023-07-07*Intended as replacement for DIN EN ISO 643 (2020-06).