Home / Standards / GB/T 4309-2009 GB/T 4309-2009 Active Classification and designation for powder metallurgy materials 粉末冶金材料分类和牌号表示方法 Standard Type GBT ICS 77.160 CCS H70 Status 现行 Issue Date 2009-03-19 Implementation 2010-01-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A