Home / Standards / GB/T 21638-2008 GB/T 21638-2008 Abolished Guide for electron beam microananlysis of defect in steel materials 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 N53 Status 废止 Issue Date 2008-04-11 Implementation 2008-10-01 Responsible Dept 国家标准委 Drafting Unit N/A