| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method capable of manufacturing a cast bloom having an excellent internal quality by stabilizing the internal segregation state of a cast bloom by improving control accuracy of a casting speed. SOLUTION: When casting the cast bloom, which has a cross-sectional area of 1,200-1,600 cm<SP>2</SP>, at a casting speed of 0.55-0.85 m/min with a specific water quantity of a secondary cooling water of 0.15-0.70 L/kg-steel, the casting speed of the cast bloom during casting is controlled to a target casting speed, by measuring the casting speed of the bloom by analyzing the image of the bloom photographed with a CCD camera set in a continuous casting machine and calculating the deviation between the casting speed and a target casting speed. In the above method, the surface temperature of the cast bloom at the photographing position of the camera is preferably made 900-1,100°C, and the camera is preferably set at the position where secondary cooling is completed and a center solid-phase ratio of the bloom is 0.05-0.50. COPYRIGHT: (C)2009,JPO&INPIT
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