| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method that can effectively suppress generation of internal flaws of a cast billet. SOLUTION: In the continuous casting method, molten steel is cast in a bottomlessly-shaped mold 2 comprising a movable and/or a fixed mold, in which a cast billet 7 with only the surface solidified by cooling is pulled out downward from the bottom of the mold, and in which the cast billet is sprayed with water on the side in a secondary cooling zone 10. A tapered cast billet is made to be cast in which at least a pair of oppositely facing inner sides of the mold are separated little by little from each other during the casting, thereby making both sides gradually flared upward. In addition, a passing time of the cast billet through the secondary cooling zone is quickened by increasing the descending speed of the cast billet during the casting, namely, the casting speed, so that a temperature difference between the surface and the center of the cast billet is suppressed to 350°C or below. COPYRIGHT: (C)2004,JPO&NCIPI
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