Home / Standards / GB/T 397 GB/T 397 Active Technical conditions of coal for coking — 2009 炼焦用煤技术条件 -2009 Standard Type GBT ICS 73.04 CCS D24 Status 现行 Issue Date 2025-05-21 Implementation 2022-10-12 Responsible Dept N/A Drafting Unit N/A