GB 223.43-1985 Methods for chemical analysis of iron,steel and alloy--The cinchonine gravimetric method for the determination of tungsten content (English Version)
2008GB/T 223.43-2008 Iron,steel and alloy.Determination of tungsten content.Gravimetric method and spectrophotometric method
1994GB/T 223.43-1994 Methods for chemical analysis of iron, steel and alloy. Determination of tungsten content
1985GB 223.43-1985 Methods for chemical analysis of iron,steel and alloy--The cinchonine gravimetric method for the determination of tungsten content
GB 223.43-1985 Methods for chemical analysis of iron,steel and alloy--The cinchonine gravimetric method for the determination of tungsten content was changed to GB/T 223.43-1994 Methods for chemical analysis of iron, steel and alloy. Determination of tungsten content.