Home / Standards / GB/T 6480-2015 GB/T 6480-2015 Active Carbide detachable bit for rock drilling 凿岩用硬质合金钎头 Standard Type GBT ICS 77.140.60 CCS H44 Status 现行 Issue Date 2015-09-11 Implementation 2016-06-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A