Home / Standards / GB/T 21931.1-2025 GB/T 21931.1-2025 Active Ferronickel—Determination of carbon content—Infrared absorption method after induction furnace combustion 镍铁 碳含量的测定 感应炉燃烧红外线吸收法 Standard Type GBT ICS 77.100 CCS H11 Status 现行 Issue Date 2025-08-29 Implementation 2026-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A