GB 223.3-1988 Methods for chemical analysis of iron, steel and alloys-Diantipyrine methane phosphomolybdic acid gravimetric method for determination of phosphorus content (English Version)
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GB 223.3-1988
GB 223.3-1988 history
1988GB/T 223.3-1988 Methods for chemical analysis of iron, steel and alloy--The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
1981GB/T 223.3-1981 Determination of phosphorus content in steel and alloy