鋼中ホウ素の状態別分析法の研究(<特集>鉄鋼分析)

概要

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An attempt has been made to establish a method for phase analysis of boron in steels which contributes to investigation of hardenability. The experimental results obtained were as follows ; (1) Extraction of boron compounds from steel was confirmed to qe favorably carried out by either the I_2-CH_3OH (14%) method or the electrolytic method. (2) It was also found that fine particles of boron compounds are apt to be dissolved by H_2SO_4 (1+6) at 60℃ and a part of them passes through the filter paper containing a litile amount of filter pulp. (3) The strong phosphoric acid decomposition of sample is most suitable for determination of total boron in steel. (4) The effective boron is calculated by subtraction of the I_2-CH_3OH insoluble boron fraction from the total boron amount determined by the strong phosphoric acid method. (5) The effect of boron on hardenability of steel is observed to correspond evidently with the effective boron content. (6) The investigation on boron distribution by means of the α-track technique suggested the relation between concentration of boron on pre-austenitic grain boundaries and the effective boron content.
社団法人日本鉄鋼協会の論文
1974-11-01