| 摘要 |
PURPOSE:To suppress formation of a pipe in the terminal part of a billet and to cast the billet having high quality with high productivity by interrupting pouring to a casting mold in the end period of continuous casting and inserting a holding plate into the casting mold then pouring additionally the remaining molten steel in a tundish to the mold. CONSTITUTION:Pouring to a casting mold 5 is interrupted in the end period of casting and a holding plate 8 provided with a hook 9 and consisting preferably of an exothermic heat insulating material is inserted into the mold 5 then the remaining molten steel 6 in a tundish 2 is additionally poured to an unsolidified part 6b while formation of a solidified shell 7 is suppressed in continuous casting consisting in supplying the molten steel 6 from the tundish 2 via an immersion nozzle 4 in a bottom part 3 to the inside of the mold 5, cooling the molten steel to form successively a solidified shell 7 and drawing continuously a billet 1 while feeding the molten steel 6 to the unsolidified part 6a formed in the lower part. The pipe to be formed in the terminal part of the billet is thus thoroughly suppressed and the floating of the inclusions in the molten steel 6 is accelerated. The billet 1 having no surface defects, etc. is obtd. at a high yield with high productivity. |
