| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method of steel which provides a high quality slab hardly causing defect due to entrainment of minute air bubble or mold flux when casting a slab having a wide casting width with high through-put by the method of continuously casting steel while controlling molten steel flow in a casing mold by using electromagnetic force.SOLUTION: When continuously casting molten steel in such high efficiency conditions that a molten steel through-put Q is 6.0 to 7.5 ton/min, and a casting width is 1850 mm or more, a molten steel ejection angle of an immersion nozzle and an immersion depth and, further, the strength of vertical DC magnetic field and the strength of upper AC moving magnetic field are caused to fall into an optimal range and, moreover, the ratio R/Q of inactive gas blowing amount R from the immersion nozzle to molten steel through-put Q is satisfied by the relations:(15-Q)/3.75≤R/Q≤(16.5-Q)/3.75. |
