| 摘要 |
PROBLEM TO BE SOLVED: To obtain a stable action in the suppression of the sticking of alumina during casting.SOLUTION: In a porous refractory for gas blowing and a gas blowing tundish upper nozzle using the porous refractory, the average pore diameter is 5 to 20 μm, also the number of the maximum values in a pore diameter distribution is two or more, and at least one of the respective maximum values is 20 to 50 μm. |
