セミキルド鋼について二, 三の研究 (I) : 脱酸度と鋼塊の気泡状況との関係

概要

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A number of test ingots weighing about 4 tons were made of semi-killed steel of C : 0.16∿0.25% and Mn : 0.34∿0.54% by applying widely different degrees of deoxidation. Taking a test-piece from the corner of each of these ingots, an investigation was carried out of the conditions of blow-holes : the relations between the degree of deoxidation and the number, the size, the position and the distribution of blow-holes were tried to be nade clear. Further, a study was made also about the mechanism of blow-hole formation. After studying quantitatively the roles of CO, H_2 and N_2 to be played about formation of blow-holes, it was concluded that in case of semi-killed steel, no small care must be paid not only to the degree of deoxidation, but also to H% in molten steel, inasmuch as that the stronger the degree of deoxidation becomes, the more the CO% in the composition of gas will get decreased, and when the deoxidation is raised so much that almost no blow-holes will come about, the gas composition will be CO : about 30%, H_2 : about 60%, N_2 : about 10%.
社団法人日本鉄鋼協会の論文
1957-10-01