| 摘要 |
<p>A nozzle system for continuous casting of an aluminum killed steel wherein 50 % or more of the total area of inner surfaces of all the nozzles for continuous casting being used for injecting a molten steel from a tundish to a mold is formed by a refractory containing CaO in an amount of 20 mass % or more. In the application of a material containing CaO to a nozzle for casting an aluminum killed steel, the amount of alumina inclusions of a large size formed in a cast piece has been found to correlate well with the total area of the inner surface of nozzles used and the CaO content of the refractory applied to the surface, and the above nozzle system allows the reduction of the amount of alumina inclusions of a large size contained in a cast piece, in any type (single type or dividable type) of nozzle.</p> |
