鋼塊用鑄型における剥離傷の研究 : 特に大型扁平鑄型について

概要

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Ingot moulds are exfoliated locally and flakily at its inner surface in the steel making practice. The author investigated these kinds of defects by means of measuring the heating and cooling temperature of the ingot moulds after pouring of the molten steel, and its microscopic inspection as well as the chemical analysis were examined. From the foundry point of view, no peculiar fact was found by several investigations. It was observed that the exfoliation appeared locally at the bottom side at the earlier stage of its use in the general case, and exfoliated pieces had always a simillar shape and thickness. In comparison with the microscopic structure of the decomposition of pearlite and graphite or decarburization it was proved that these defects were not caused by "crazing" or growth of the cast iron, but saemed to be influenced by each of heating and cooling conditions that is, the temperature up to 850℃, the position and the time approximately 4 hrs. of heating of the ingot mould. At the same time, the chemical composition (especially manganese content) of the ingot seemed to have relation to such exfoliation as aforementioned. This problem will be reported with results of some other experiments in the next occasion when the succeeding study would have been completed.
社団法人日本鉄鋼協会の論文
1954-01-25