Crater End Detection in Continuous Casting by Longitudinal and Shear Wave Hybrid Technique with High Sensitivity EMAT

Abstract

The final solidification position in continuous casting is a very important index for productivity and product quality, and continuous measurement is required. An apparatus to measure solidification completion position by electromagnetic ultrasonic method was developed. High sensitivity electromagnetic ultrasonic sensor using digital signal processing and Halbach array, and calibration method using longitudinal and transverse waves of ultrasonic wave enabled high sensitivity and continuous measurement of final solidification position. As a result of the application to the operation improvement, the following effects were obtained: productivity improvement by the improvement of casting speed, and improvement of center segregation in the steel plate for pipeline.