Home / Standards / GB/T 18931-2002 GB/T 18931-2002 Abolished Classification of basic refractory products containing less than 7% residual carbon 残炭含量小于7%的碱性耐火制品分类 Standard Type GBT ICS 81.080 CCS Q40 Status 废止 Issue Date 2002-12-31 Implementation 2003-06-01 Responsible Dept 国家标准委 Drafting Unit N/A