| 摘要 |
PROBLEM TO BE SOLVED: To provide a quantitative analytical method in which the influence of a coexistent element is eliminated and whose accuracy is high when nitrogen in steel is analyzed by an emission spectroanalytical method. SOLUTION: In a quantitiative analytical method, the nitrogen content N0 of a multiple alloy in which one kind or two or more kinds of coexistent elements are contained in an Fe-N binary alloy is found by using the working curve of the Fe-N binary alloy, the nitrogen content NA of the multiple alloy is quantitatively determined by an emission spectroanalytical method using an expression of NA =(N0 -ΣNi )/(1+α)= N0 -Σ(Xi×Li )/(1+α)} on the basis of an influence factorαwhich is found by the relationship between the total sumΣNi of error amounts Ni defined by the product of the content Xi of the coexistent elements multipled by an influence factor Li , the true nitrogen content Nt of the multiple alloy and a nitrogen error amount (N0 -Nt ). In the quantitative analytical method, even when the N content in steel of the multiple alloy is at 0.01 wt.% or lower, nitrogen can be quantitatively analyzed with high accuracy, and the excellent analytical accuracy of the nitrogen is obtained in a range in which the coexistent elements are C<=2 wt.% (including 0%), Si<=2 wt.% (including 0%), P<=0.2 wt.% (including 0%), and Co<=1 wt.% (including 0%).
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