Home / Standards / GB/T 8731-2008 GB/T 8731-2008 Abolished Free-cutting structural steel 易切削结构钢 Standard Type GBT ICS 77.140.01 CCS H40 Status 废止 Issue Date 2008-09-11 Implementation 2009-05-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A