| 摘要 |
PURPOSE:To prevent clogging of an immersion nozzle and erosion of inner wall in the nozzle in pouring method for continuously casting a steel and to produce a cast slab having excellent product quality after rolling. CONSTITUTION:In the pouring method for molten steel 6 into a mold 5 from a tundish 2, this is continuous casting method for steel executed by making relation between inert gas flow rate blown from anyone of a stopper 1 in the tundish, upper nozzle 3, plate for sliding nozzle, intermediate nozzle and the immersion nozzle 4 and molten steel pouring flow rate, in the range limited to the some conditional range and containing the fixed C, CaO and ZrO2 components in the part bringing the immersion nozzle into contact with the molten steel. The clogging of immersion nozzle with alumina is prevented and under stable casting condition without eroding the immersion nozzle, the cast slab having a little defect can be produced. |
