温硫酸法による Cr 鋼中のサンド定量方法に就て

概要

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It has been recognized by Gakushin that non-metallic inclusions in high carbon steel or chromium steel was determined by the hot-H_2SO_4 method. But should quenching be not carried out on these steel, there produced the carbide that will not be decomposed by making use of KMnO_4 oxidizing agent, and no reproducible result would be obtained. The authors have made an investigation on the applicable limit of quenching and samples making on the alloying elements in this kind of steel. The results obtained were as follows. (1) It will generally be desirable to make water quenching for the cutting specimens, though we trially designed the vacuum quenching apparatus for the drilling specimen. (2) It is not necessary to quench when carbon and chromium contents in Cr-steeIs are less than 0.7% and 1% respectively. Quenching is generally required on 13% Cr-steel and 18-8 stainless steel, however, in case Ti is contained in them, TiC will be produced which is not decomposed by KMnO_4 treatment. On the other hand the authors have made an experiment on soIubility of Cr_2O_3 by Hot-H_2SO_4 method, and have found that Cr_2O_3 content in chromium steel is determined by this method. In connection with the above, as a result of quantitative analysis of Cr_2O_3 contained in bearing steel or case-hardened steel, we reached the conclusion that its content is far less than silicate or aluminate inclusions.
社団法人日本鉄鋼協会の論文
1956-02-01