Home / Standards / GB/T 39638-2020 GB/T 39638-2020 Active X-ray digital radiographic testing for casting 铸件X射线数字成像检测 Standard Type GBT ICS 77.040.20 CCS J31 Status 现行 Issue Date 2020-12-14 Implementation 2021-07-01 Responsible Dept 国家标准委 Drafting Unit N/A