GB 223.43-1985Iron, steel and alloy -- Determination of tungsten content -- Gravimetric method and spectrophotometric method (English PDF)

Foreword

GB/T in this part 223 instead of the GB/T 223.43-1994 "steel and alloy chemical analysis method for determining the amount of tungsten." this portion of the GB/T 223.43-1994 compared primarily with the following modifications.

--- Name to "Determination of tungsten steel and alloy content gravimetric method and spectrophotometry";

--- Increased water analysis reagents and instructions to modify the content and concentration of representation;

--- Modified Weigh Sample volume represented;

--- Modify the results of the formula in the amount of representation;

--- Change the specification for precision functional description.

Appendix A of this section is informative appendix.

This part is proposed by the China Iron and Steel Association.

This part of the National Steel Standardization Technical Committee.

This section drafted by. Institute of Metal Research, Daye steel mills.

1 Scope

This section GB/T 223 requirements using cinchonine gravimetric and tetrakis phenylarsonic - thiocyanate - chloroform extraction photometric measurements Set tungsten content.

This section cinchonine gravimetric method is suitable for steel, high temperature alloys and precision alloys mass fraction of 1.00% - 22.00% of the amount of tungsten Determination.

This section tetrakis phenylarsonic - thiocyanate - chloroform extraction spectrophotometric method for carbon steel, alloy steel and high temperature alloys mass fraction to determine the number of 0.050% to 1.50% tungsten content.

2 Normative references

The following documents contain provisions which, through reference GB/T 223 of this text, constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 223.12 Methods for chemical analysis of iron, steel and alloys of sodium carbonate separation - diphenyl hydrazine spectrophotometric determination of chromium content GB/T 223.14 Methods for chemical analysis of iron, steel and alloys, tantalum reagent extraction and spectrophotometric determination of vanadium content Spectrophotometric determination of molybdenum content GB/T 223.26 Methods for chemical analysis of iron, steel and alloy The thiocyanate direct GB/T 6379.1 measurement methods and results of Accuracy (trueness and precision) - Part 1. General principles and definitions GB/T 6379.2 measurement methods and results of Accuracy (trueness and precision) - Part 2. Determine the weight of a standard measurement method the basic method of refolding and reproducibility GB/T 20066 Steel and iron - Sampling and determination of the chemical composition of the sample with a sample preparation method 3 a method cinchonine gravimetric method