Home / Standards / GB/T 12770-2012 GB/T 12770-2012 Abolished Welded stainless steel tubes for mechanical structures 机械结构用不锈钢焊接钢管 Standard Type GBT ICS 77.140.75 CCS H48 Status 废止 Issue Date 2012-11-05 Implementation 2013-05-01 Responsible Dept 中国钢铁工业协会 Drafting Unit 中国钢铁工业协会