Home / Standards / GB/T 39974-2021 GB/T 39974-2021 Active Magnesium partially stabilized zirconia ceramic element for oxygen measurement in molten steel 钢水测氧用镁稳定氧化锆陶瓷元件 Standard Type GBT ICS 81.060.30 CCS Q32 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A