Home / Standards / GB/T 31936-2015 GB/T 31936-2015 Active Rolls for welding steel pipe 焊接钢管轧辊 Standard Type GBT ICS 77.180 CCS H94 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