| 摘要 |
PURPOSE:To continuously cast a cast slab without any surface defect by forming metal in a mold or at position containing the continued position with the mold into a holding range to the molten state and a solidified range and making a thermal conductivities of lining materials and ratios of thicknesses respectively at the two ranges, the specific values. CONSTITUTION:As the continuous casting mold for metal, the water cooled, copper mold 3 lining the copper as main material having cooling mechanism is used. At the time of pouring the molten steel from the pouring nozzle 6, the holding range 1 to the molten state of molten steel and the solidified starting range 2 are developed in the mold 3 and at position containing the continued position with the mold 3. These two ranges 3, 2 have no difference or the range 2 is made to smaller than the range 1 to the inner diameters. At the time of using A1, A2 (cal/cm.sec.K) for the thermal conductivities and t1, t2 (cm) for the thickness of the molten state holding range 1 and the solidified starting range 2 respectively, the conditions of A1/t1<=(A2/t2)/3 and A2/t2>=0.01 have to be satisfied. In this way, the cast slab without any surface defect is obtd. and the product yield is improved. |
