Home / Standards / GB/T 31977-2015 GB/T 31977-2015 Active Seamless copper alloy tubes for nuclear power heat-exchanger 核电冷凝器用铜合金无缝管 Standard Type GBT ICS 77.150.30 CCS H62 Status 现行 Issue Date 2015-09-11 Implementation 2016-08-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A