Home / Standards / GB/T 12718-2009 GB/T 12718-2009 Active High-tensile steel chains ( round link ) for mining 矿用高强度圆环链 Standard Type GBT ICS 21.220.30 CCS J81 Status 现行 Issue Date 2009-10-30 Implementation 2010-04-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A