| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas blowing nozzle in which even if a metallic case surrounding an outer peripheral surface of a nozzle body deforms, gas leak hardly occurs, and which makes it possible to blow gas uniformly from whole in a height direction of a nozzle inner hole. <P>SOLUTION: The gas blowing nozzle 2 has a nozzle inner hole 2b through which a molten metal passes, and blows gas from a surface of the nozzle inner hole 2b, wherein a second permeability refractory 2a-2 is arranged to an outer peripheral side of a first permeability refractory 2a-1 which has the nozzle inner hole 2b, a gas supply pipe 4 is connected to the second permeability refractory 2a-2, an average pore diameter of the first permeability refractory 2a-1 is less than 50 μm, and an average pore diameter of the second permeability refractory 2a-2 is at least 70 μm. <P>COPYRIGHT: (C)2012,JPO&INPIT |
