Home / Standards / GB/T 30757-2014 GB/T 30757-2014 Abolished Classification of basic dense shaped refractory products containing from 7% to 50% residual carbon 残碳量7％～50％的碱性致密定形耐火制品分类 Standard Type GBT ICS 81.080 CCS Q40 Status 废止 Issue Date 2014-03-27 Implementation 2014-12-01 Responsible Dept 国家标准委 Drafting Unit N/A