鋳鋼品ガス欠陥の基礎的研究

概要

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An investigation was made about the causes of pinholes and blow-holes in small doughnut-shaped castings. The steel grades included SC37 (cast type 1010), SCS1 (cast type 410) and SCS13 (cast type 304). The holes caused by oxygen, hydrogen and nitrogen in molten steel were classified into three types, according to the gamma ray photographed shape. A drip-shaped, a stringy and a spherical type were named X, Y and Z type, respectively. CO gas presumably causes X type of blow-holes because this type appears when Sol. Al level is low in SC37. Y type is observed in all steel grades when hydrogen in molten steel is high enough. Z type appears when the nitrogen content exceeds a certain level in SC37. Some consideration about the blow-hole formation is given on referring to the test result and the solubility change of gaseous elements during solidification.
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