China 'GB/T 223.37-2020
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 223.37-2020
Iron, steel and alloy—Determination of nitrogen content—Indophenol blue spectrophotometric method after distillation separation 钢铁及合金 氮含量的测定 蒸馏分离靛酚蓝分光光度法
Issued Date:2020-06-02
Implemented Date:2021-12-01
Issued by:
The Standardization Administration of the People's Republic of China