鹽素法に依る鋼中の非金屬介在物の定量法に就て (III)

概要

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In determining the non-metallic inclusions in ferro-chromium by the chlorine method, the warm sulphuric acid method, the hydrochloric acid method and the vacuum melting method, the following result was obtained : - In the chlorine method the tomperature of the hydrochloric acid treatment should be raised to 700℃ in order perfectly to sublimate the dissolved chromium. At this temperature the chromium oxide in silica and silicate may be perfectly determined, but the chromium oxide in the free state and alumina are entirely attacked and impossible to determine. In the warm sulphuric acid method, the free chromium oxide is not attacked and may be determined, while the silica content is revealed in a comparatively lower value. In determining the alumina the hydrochloric acid method is most suitable. For determining the total oxygen the vacuum melting method is the most accurate.
社団法人日本鉄鋼協会の論文
1944-03-25