METHOD FOR CONTROLLING THE SOLIDIFICATION STRUCTURE OF STEEL USING THE INPUT OF ULTRASONIC

摘要

A lecture coagulating structure control method is provided to increase the quality and to reduce the reduction rate of post-processing by making the coagulating structure of a slab fine. A lecture coagulating structure control method comprises: a first step of arranging a ultrasonic wave confirmation device at one part of a strand positioned in the lower part of a mold(S100); a second step of measuring the impedance change of the ultrasonic wave on a real time basis by monitoring the input current of the ultrasonic wave confirmation device and the phase of the output current(S200); and a third step of authorizing the ultrasonic wave of the ultrasonic wave confirmation device in the task site of the strand, if it is within the preset area satisfying the resonance condition that difference of the input and output current(S300,S400).