Abstract
In the foregoing papers it was reported that, with addition of ferro-chromium in the last period of refining, how the non-metallic inclusion in molten steel varied, when chromium steel was melted in a basic arc furnace, basic and acid open-hearth furnaces. (Tetsu-to-Hagane, Vol. 36, 1950, No. 11, p. 15; Vol. 37, 1951, No. 3, p. 19) Further, the effect of chromium contained in the charging materials upon the non-metallic inclusion was investigated.Summarizing the relation between chromium and non-metallic inclusion, the following table was obtained.Namely, the effect of chromium on the non-metallic inclusion in every case had a quite similar tendency at the same furnace, but, comparing the case of basic arc furnace with that of acid open-bearth furnace, an entirely opposite phenomenon was observed. In the case of basic openhearth furnace an intermediate effect of the above two was shown.
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