Home / Standards / GB/T 7731.10-2021 GB/T 7731.10-2021 Active Ferrotungsten—Determination of carbon content—Infrared absorption method 钨铁 碳含量的测定 红外线吸收法 Standard Type GBT ICS 77.100 CCS H11 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A