GB/T 223.66-1989 Methods for chemical analysis of iron,steel and alloy--The thiocyanate-chlorpromazine hydrochloride-chloroform extraction photometric method for the determination of tungsten content (English Version)
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GB/T 223.66-1989
Scope
This standard specifies the thiocyanate-chlorpromazine hydrochloride-chloroform extraction photometric method for the determination of tungsten content. This standard applies to the determination of tungsten content in carbon steel, medium and low alloy steel. The measurement range is 0.0020% to 0.100%.
GB/T 223.66-1989 history
1989GB/T 223.66-1989 Methods for chemical analysis of iron,steel and alloy--The thiocyanate-chlorpromazine hydrochloride-chloroform extraction photometric method for the determination of tungsten content