| 摘要 |
PURPOSE:To make thickness of a cast slab thin and to reduce working ratio of hot rolling process by having gap, which is possible to insert a casting nozzle in horizontal sectional shape, at upper end of a mold and forming slender horizontal sectional shape corresponding to the thickness of the cast slab at lower part of the mold. CONSTITUTION:In the mold 31, distance L arranged to insert the pouring nozzle at the upper end, becomes to distance (l) corresponding to the thickness of the cast slab 32 at the lower end of the mold. That is, the solidified shell to become main part in the cast slab 32 surface descends inner space of the mold 31 along inclined surfaces S1, S2. Then, the inclined surfaces S1, S2. Then, the inclined surfaces S1, S2 contact with the solidified shell 33, so as to cancel out shrinkage of the solidified shell 33. Therefore, by cooling mechanism 30 built in the mold 31, the molten steel 35 and the solidified shell 33 are cooled under good efficiency along the whole length toward vertical direction of the mold.
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