METHOD FOR DETECTING SOLIDIFICATION COMPLETION POSITION OF CONTINUOUSLY CAST SLAB, AND METHOD FOR PRODUCING CONTINUOUSLY CAST SLAB

摘要

PROBLEM TO BE SOLVED: To provide a method for detecting the solidification completion position of a slab in continuous casting using a water jet coupling method.;SOLUTION: The method for detecting the solidification completion position includes: sending ultrasonic waves sent from an immersion probe 15 disposed between rolls of slab support rolls 7 of a continuous casting machine 1 to a slab 11 during casting by way of a water column formed between the immersion probe and the surface of the slab; receiving the ultrasonic waves reflected on the surface of the slab by the immersion probe by way of the water column; and measuring the distance between the immersion probe 15 and the surface of the slab based on the period of time from the sending to the receiving of the ultrasonic waves, wherein when there is a term during which the absolute value of a changing rate with time of the measured distance satisfies ≥30 mm/s, it is determined that there is a non-solidified layer 13 in the inside of the slab at a portion where the distance is measured by the immersion probe.;COPYRIGHT: (C)2013,JPO&INPIT