Home / Standards / GB/T 28413-2012 GB/T 28413-2012 Active Welded carbon steel tubes for boilers and heat exchangers 锅炉和热交换器用焊接钢管 Standard Type GBT ICS 77.140.75 CCS H48 Status 现行 Issue Date 2012-06-29 Implementation 2013-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit 中国钢铁工业协会