| 摘要 |
PURPOSE:To lower the fraction defective of a composite metallic plate by providing a blowing gas use chamber on the outer wall of a nozzle, also embedding and providing plural pieces of stainless steel thin pipes on the nozzle wall, and discharging an invert gas into a molten metal from this pipe. CONSTITUTION:Plural pieces of SUS pipes 10 for blowing an inert gas 11 are embedded and placed in a molten metal nozzle 5 made of a refractory. A gas chamber 12 for connecting the pipe 10 by the periphery is provided on the outer wall of the nozzle 5, and connected to a hose 13, a flow rate adjusting valve 15, etc. A composite material 8 is attached to the inner wall of a casting mold 2, molten steel 4 of a ladle 7 is brought to casting through a center runner 6 and a runner 3, and the composite material 8 is brought to an internal chill. In this case, the inert gas 10 is blown into the nozzle 5 through the hose 13, the chamber 12 and the pipe 10. By this method, the molten steel 4 is stirred, an inclusion 9 is separated form the interface of the composite material 8 and floats up. Accordingly, the fraction defective of a composite metallic plate which has been rolled is lowered.
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