Home / Standards / GB/T 28909-2012 GB/T 28909-2012 Active Extra-high strength structural steel plates in the heat-treatment condition 超高强度结构用热处理钢板 Standard Type GBT ICS 77.140.50 CCS H46 Status 现行 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