| 摘要 |
PURPOSE:To prevent nozzle clogging and surface defect by blowing gas having high dissolving speed into the molten steel as single or mixed gas in the case of blowing the gas into an immersion nozzle. CONSTITUTION:The gas is blown into the immersion nozzle 3 at interval between a tundish 1 and a mold 5 for continuous casting to prevent the nozzle 3 clogging. In this case, the gas, e.g. H2 gas, having high dissolving speed into the molten steel 2 is used as the used gas. By this method, the quantity of the gas bubbling floating up on the molten steel surface is drastically reduced, and only few quantity is floated up and the other large quantity of the gas is dissolved and absorbed into the molten steel 2 during flowing down in the nozzle or during floating up in the molten steel by flowing into the mold 5 from the nozzle 3. By this method, the clogging of the immersion nozzle 3 is prevented and also the surface defect of the product can de prevented. |
