Home / Standards / GB/T 33949-2017 GB/T 33949-2017 Active Copper alloy ring material for bearing cage 轴承保持架用铜合金环材 Standard Type GBT ICS 77.150.30 CCS H62 Status 现行 Issue Date 2017-07-12 Implementation 2018-02-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A