Home / Standards / GB/T 223.12-91 GB/T 223.12-91 Steel and alloy—Determination of chromium content by sodium carbonate separation—Diphenylcarbazide photometric method 钢铁及合金化学分析方法碳酸 钠分离-二苯碳酞二肼光度法测定铬量 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A