| 摘要 |
PURPOSE:To decrease the contents of foreign inclusions in non-steady and steady parts and to obtain clean steel by specifying the immersion distance from the bottom end of a nozzle for charging of molten metal of a ladle down to the melt surface and the time until the bottom end of the nozzle dips in the molten metal. CONSTITUTION:In the steady part in continuous casting for executing consecutive continuous casting, the immersion distance LP (immersion depth) from the bottom end of a nozzle 10 for charging of molten metal of a ladle 22 immersed in the molten metal in a tundish 2 down to the melt surface of the tundish is maintained at >=150mm.. In the non-steady part, the time LT (immersion time) since starting of supplying of the molten metal from the nozzle 10 until immersion of the bottom end of the nozzle 1 in the molten metal in the tundish 2 is maintained at <=(210-30XVC)(sec) (where VC is a casting speed, ton/min). |
