| 摘要 |
PURPOSE:To shallow submergence of discharging flow of molten steel, to reduce inclusion, to clean a steel and to improve the steel by forming the shape of inner hole of a submerging nozzle in the continuous casting device under the specific condition. CONSTITUTION:The nozzle 1 is constituted by giving the following relation among the reverse tapered angle theta at low part 4 of the inner hole of the submerged nozzle 1, length (l) of the reverse tapered part and the diameter (d) of the straight line part at upper part. l.tantheta>=0.08d, l>=2d, theta<60 deg. By such constitution, the submergence of discharging flow of the molten steel for the bottom discharging type submerged nozzle is shallow and the inclusion is reduced and the quality of the steel is improved. |
