Home / Standards / GB/T 28708-2012 GB/T 28708-2012 Active Specification for size selection of seamless and welded steel pipe used in piping engineering 管道工程用无缝及焊接钢管尺寸选用规定 Standard Type GBT ICS 23.040.60 CCS J15 Status 现行 Issue Date 2012-09-03 Implementation 2013-03-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会