Home / Standards / GB/T 31315-2014 GB/T 31315-2014 Active Cold drawn or cold rolled precision weld steel tubes for mechanical structures 机械结构用冷拔或冷轧精密焊接钢管 Standard Type GBT ICS 77.140.75 CCS H48 Status 现行 Issue Date 2014-12-05 Implementation 2015-09-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A