Research and Development > Technical Report > No.10 Special Issue on High Strength Steel Sheets >Quality Measurement Techniques for Hot-rolling Rolls

No.10 Special Issue on High Strength Steel Sheets [General Issues]

Quality Measurement Techniques for Hot-rolling Rolls

TAKADA Hajime     YAMAMOTO Katsushi     HIRAOKA Hisashi

Abstract

This paper describes state-of-the-art nondestructive testing techniques developed at JFE steel for the hotrolling of steel sheets. The following are reported: (1) A technique for high-resolution ultrasonic detection of internal flaws in deep positions through a combination of focused beam testing and a synthetic aperture method; (2) A technique for detecting surface flaws with a high signal-to-noise ratio using a newly developed broad-bandwidth surface wave probe; (3) An intelligible display technique for mapping the flaws detected in the surface testing. The development of these techniques has made it possible to thoroughly evaluate the soundness of work-rolls. The techniques are now being applied to actual production processes to maintain a high surface quality for sheet steel and to prevent work-roll troubles caused by internal flaws and surface flaws.

Full Pages