Home / Standards / GB/T 40304-2021 GB/T 40304-2021 Active Determination of content of nonmetallic inclusions in steel—Billet full section method 钢中非金属夹杂物含量的测定 钢坯全截面法 Standard Type GBT ICS 77.040.99 CCS H24 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