連鋳々片における CO 気孔の生成と抑制

概要

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The key factor in continuous casting of rimmed or semi-killed steels is the suppression of CO blowholes on the slab surface. This report deals with the critical condition of blowhole formation in slabs cast by the bow type machine and the suppression of blowholes. (1) The critical free oxygen concentration for blowhole formation for hot rolled plate grade of C__-≥0.08% is approximately 55 ppm whereas that for cold rolled sheet of C__-≤0.06% increases with decreases in C concentration. (2) Blowholes can be successfully suppressed by causing the molten steel to flow at the vicinity of meniscus at the required flow corresponding to the composition of steel. (3) The critical values of enriched solute elements and the partial pressure of CO, P_<CO> at the solid-liquid interface of solidifying steel for blowhole formation are estimated by introducing the mutual reaction model in the multiple components system. The shapes of blowholes estimated from the model agree well with the measured ones.
社団法人日本鉄鋼協会の論文
1983-10-01