Quality of steel material evaluation method and quality evaluation device

摘要

Quality evaluation device by the frame steel, toward the scanning surface S2 facing the black leather surface S1 of the steel material 1 comprising a surface layer portion by scanning an ultrasonic signal, from steel 1 that occur due to the scanning of the ultrasonic signal a flaw detector controller 11 which receives the echo signal, and calculates a propagation path length of the echo signal from a black skin surface S1 with the waveform data of the echo signal, mill scale from the calculated propagation path length in the scanning direction of the ultrasonic signal black leather surface shape profile calculating unit 14 for calculating the shape profile of the surface S1, the detection range of the echo signal resulting from defects in the steel material 1 on the basis of the shape profile of the black skin surface S1 is set as a flaw detection gate, set and a generates a mapping defect indication image the maximum value of the echo signal in the flaw detection gate, a defect indication imaging unit 15 and defect instruction output unit 16 outputs, to.