鋼塊の氣泡發生に及ぼす含有ガスの影響

概要

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The effect of oxygen, hydrogen and nitrogen contents in molten steel on the blowhole formation in ingots was studied. Low carbon steels of various gas contents were melted in the induction furnace. The weight of ingots were about 50kg. Oxygen was controlled by addition of the Si, hydrogen was controlled by the vaccum heating of raw materials and blow of hydrogen gas and nitrogen was controlled by addition of the Mn nitride. Main results are as follows : - Low hydrogen and nitrogen steels were killed by the relatively low Si content, but fully deoxidized steel became unsound according to an increase of their hydrogen or nitrogen contents. Blowhole or segregation of high hydrogen or nitrogen unsound steel ingots were similar to that of imperfectly deoxidized steel ingots. Quantities and position of blowholes of ingots were not only affected by their oxygen contents, that is, their deoxidized condition, but also affected by their hydrogen or nitrogen contents. High hydrogen or nitrogen steel ingots had more blowholes than the low hydrogen and nitrogen steels of the same deoxidized condition. Effect of hydrogen or nitrogen on the blowhole formation varies with degree of deoxidation, that is, rimmed steel was scarcely affected, but semikilled or killed steel, especially semikilled steel was affected strongly by their hydrogen or nitrogen contents.
社団法人日本鉄鋼協会の論文
1953-05-25