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METHOD FOR PREDICTING OCCURRENCE OF STEEL SHEET DEFECT IN SLAB, METHOD FOR MANUFACTURING SLAB, DEVICE FOR PREDICTING OCCURRENCE OF STEEL SHEET DEFECT IN SLAB, AND CONTINUOUS CASTING MACHINE EQUIPPED WITH DEVICE FOR PREDICTING OCCURENCES OF STEEL SHEET DEFECT IN SLAB
METHOD FOR PREDICTING OCCURRENCE OF STEEL SHEET DEFECT IN SLAB, METHOD FOR MANUFACTURING SLAB, DEVICE FOR PREDICTING OCCURRENCE OF STEEL SHEET DEFECT IN SLAB, AND CONTINUOUS CASTING MACHINE EQUIPPED WITH DEVICE FOR PREDICTING OCCURENCES OF STEEL SHEET DEFECT IN SLAB
Disclosed is a method for predicting the occurrence of a defect caused by alumna inclusion in a slab produced by continuous casting while changing a pouring speed of molten steel in response to detection of a molten steel level in a mold and blowing an inert gas such as argon gas into molten steel from a tundish nozzle 5 mounted on a bottom part of a tundish 3 wherein, an amount of change in increase or decrease of a back pressure of the inert gas is detected, and it is determined whether or not a change in the back pressure follows a change in the pouring speed of molten steel based on whether or not the number of times of cases where the change amount is equal to or more than a preset range is the predetermined number of times or more within a predetermined time. A device for predicting the occurrence of a sliver caused by alumna inclusion in a slab, a method for manufacturing a continuously cast slab using the method, and a continuous casting machine provided with the device are also disclosed.
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