Home / Standards / GB/T 18257-2021 GB/T 18257-2021 Active Hot-face identification marking of refractory bricks for use in rotary kilns 回转窑用耐火砖热面标记 Standard Type GBT ICS 81.080 CCS Q40 Status 现行 Issue Date 2021-10-11 Implementation 2022-05-01 Responsible Dept 国家标准委 Drafting Unit N/A