Home / Standards / GB/T 4139 GB/T 4139 Active Ferrovanadium 钒铁 Standard Type GBT ICS 77.100 CCS H42 Status 现行 Issue Date 2012-12-31 Implementation 2013-10-01 Responsible Dept 中国钢铁工业协会 Drafting Unit 中国钢铁工业协会