Home / Standards / GB/T 31309-2014 GB/T 31309-2014 Abolished Calculation of electoron vacancy number in nickel-base superalloys 镍基高温合金电子空位数计算方法 Standard Type GBT ICS 77.040.99 CCS H24 Status 废止 Issue Date 2014-12-05 Implementation 2015-09-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A