Home / Standards / GB/T 38770-2020 GB/T 38770-2020 Active Spheroidite examination and grading for low and medium carbon steels 低、中碳钢球化组织检验及评级 Standard Type GBT ICS 25.200 CCS J36 Status 现行 Issue Date 2020-04-28 Implementation 2020-11-01 Responsible Dept 国家标准委 Drafting Unit N/A