Home / Standards / GB/T 223.40-2007 GB/T 223.40-2007 Active Iron, steel and alloy - Determination of niobium content - The sulphochlorophenol S spectrophotometric method 钢铁及合金 铌含量的测定 氯磺酚S分光光度法 Standard Type GBT ICS 77.040.30 CCS H11 Status 现行 Issue Date 2007-03-09 Implementation 2007-10-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A