2018GB/T 223.82-2018 Steel and iron.Determination of hydrogen content.Thermal conductivity/infrared method after fusion under inert gas
2007GB/T 223.82-2007 Steel and iron-Determination of hydrogen content-Inert gas impulse fusion heat conductivity method
1994GB/T 223.22-1994 Methods for chemical analysis of iron ,steel and alloy.The nitroso-R-salt spectrophotometric method for the determination of cobalt content
1982GB 223.22-1982 Chemical analysis of iron,steel and alloy--The determination of cobalt by the nitroso-R salt photometric method
1981GB/T 223.2-1981 Determination of sulfur content in steel and alloy