鐵鋼中のサンド分析方法に就て

概要

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For the determination of silicate inclusion in steel, Dickenson's nitric-acid process has been hitherto most widely adopted. In this process, however, a considerable time is taken for dissolving samples and the manipulation is comparatively tedions. The present authors have modified Dickenson's method, and after exhaustive research attained to the Hot Nitric-acid process which is a rapid analytical method. The general procedure of this new method is as follows : - The sample pieces weighing about 100_<gms>. are dissolved in HNO_3 (1 : 3) at about 90℃ for 30 to 40_<min>, and the excess acid is neutralized with NH_4OH. The residual silicate inclusion is treated with KMnO_4 solution and H_2O_2 as in the case of Dickenson's process. With this rapid process, one complete analysis can be finished withiu only three days, and the result is sufficiently reliable. The authors have also adopted Sisco's electrolytic analysis for the determination of silicate inciusion in 18/8 steel or other high chromium steels, which are difficulb to be dissolved in HNO_3.
社団法人日本鉄鋼協会の論文
1939-12-25