Home / Standards / GB/T 28300-2012 GB/T 28300-2012 Abolished Surface quality classes for hot-rolled bars and rods technical delivery conditions 热轧棒材和盘条表面质量等级交货技术条件 Standard Type GBT ICS 77.140.60 CCS H40 Status 废止 Issue Date 2012-05-11 Implementation 2013-02-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A