| 摘要 |
PROBLEM TO BE SOLVED: To provide a bottom pouring ingot casting method which suppresses occurrence of coarse inclusions, and can produce an ingot having excellent cleanliness.SOLUTION: When a bottom pouring ingot casting method of charging a molten steel 2 into a mold 5 via a pouring tube 4 is performed, a coating material 10 for coating the molten steel 2 in the mold 5 with a bath face is added, and thereafter, Ca 12 as metal Ca and/or a Ca alloy with the average grain size of ≥200 μm is added thereto. The heat insulating material is added in such a manner that the addition amount of the Ca component in the Ca 12 to the surface area of the bath face reaches a value within the range of 0.35 to <10 kg/m, and further, [%Ca]/([%Al]+3[%FeO]+[%FeO]+2[%SiO]+2[%MnO]+[%S]) showing the relation between the component content of the heat insulating material and the Ca component content in the added Ca 12 reaches a value within the range of 0.08 to <0.25; wherein, [%X] denotes the X content (mol%) in the heat insulating material. |
