China National Standards

China Ferrotungsten—Determination GB Standards List

  •  China "Ferrotungsten—Determination" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 7731.5-2021 Ferrotungsten—Determination of silicon content—Silicomolybdenum blue spectrophotometric method
    钨铁 硅含量的测定 硅钼蓝分光光度法    		 China National Standards
    Ferrotungsten—Determination
    English PDF
    GB/T 7731.4-2021 Ferrotungsten—Determination of phosphorus content—Phosphorus molybdenum blue spectrophotometric method
    钨铁 磷含量的测定 磷钼蓝分光光度法    		 China National Standards
    Ferrotungsten—Determination
    English PDF
    GB/T 7731.1-2021 Ferrotungsten—Determination of tungsten content—Cinchonine gravimetric method and ammonium nitrate gravimetric method
    钨铁 钨含量的测定 辛可宁重量法和硝酸铵重量法    		 China National Standards
    Ferrotungsten—Determination
    English PDF
    GB/T 7731.10-2021 Ferrotungsten—Determination of carbon content—Infrared absorption method
    钨铁 碳含量的测定 红外线吸收法    		 China National Standards
    Ferrotungsten—Determination
    English PDF

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