| 摘要 |
PURPOSE:To produce a continuous casting product without any defect by inserting a nozzle resistant body having smaller diameter than diameter of inner hole in the inner hole at the position corresponding to the under part of molten metal surface in the submerged nozzle. CONSTITUTION:The molten metal is poured into the under part of the molten metal surface 10 in a mold from a tundish with the submerged nozzle 3 for continuous casting. This nozzle 3 is cylindrical shape having bottom and has hollow inner hole 3a and plural discharging holes 7 at side wall of lower part. The nozzle resistant body 11 having smaller inner diameter D1 in the cross section than the inner diameter D0 of the inner hole 3a is arranged in a part or over the whole of the inner hole 3a at the position corresponding to the under part of the molten metal surface 10 in the mold of the submerged nozzle 3. The ratio D1/D0 of the inner diameter D1 of the nozzle resistant body and the inner diameter D0 of the inner hole is to be in the range of 0.6<=D1/D0<=0.93. By this method, the continuous casting product without any defect can be produced. |
