Home / Standards / GB/T 21638-2025 GB/T 21638-2025 Active Microbeam analysis—Guidelines for electron beam microanalysis of defects in steel materials 微束分析 钢铁材料缺陷电子束显微分析方法通则 Standard Type GBT ICS 71.040.99 CCS N 53 Status 现行 Issue Date 2025-03-28 Implementation 2025-10-01 Responsible Dept 国家标准委 Drafting Unit N/A