Home / Standards / GB/T 1426-1978 GB/T 1426-1978 Abolished Carbon materials--Classifications 炭素材料分类 Standard Type GBT ICS 91.100.20 CCS Q50 Status 废止 Issue Date 1978-09-29 Implementation 1978-10-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A