Home / Standards / GB/T 3639-2009 GB/T 3639-2009 Abolished Seamless cold-drawn or cold-rolled steel tubes for precision applications 冷拔或冷轧精密无缝钢管 Standard Type GBT ICS 77.140.75 CCS H48 Status 废止 Issue Date 2009-10-30 Implementation 2010-05-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A