In-Plant Demonstration of High-Temperature EMAT System on Continuous Caster Strand.

摘要

The Pacific Northwest Laboratory (PNL) has been working with the Office of Industrial Programs of DOE and the American Iron and Steel Institute (AISI) since 1983 to develop a sensor that can determine the internal temperature of hot steel bodies. Research projects utilizing the relationship between acoustic velocity and temperature have been the primary technique investigated. The techniques most recently used have been laser-generated stress waves and EMAT systems. Development of an ultrasonic sensor that can measure the acoustic velocity at high temperatures has been the major effort over the past few years. The internal temperature of steel bodies can be determined by measuring the time-of-flight through a known distance to calculate the velocity, and from the relationship between temperature and velocity, the average internal temperature can be determined. A non contact sensor system for measuring the time-of-flight of longitudinal acoustic waves of hot steel objects has been developed. Working with Magnasonics, Inc., the high-temperature capabilities of the pulsed EMAT receiver and EM pulser were developed. The sensors were laboratory tested on hot steel surfaces up to 2300/degree/F. This paper will review the high-temperature EM pulser/pulsed EMAT receiver equipment and the results of the in-plant test performed at the continuous caster at the Baltimore Specialty Steel Corporation, Baltimore, Maryland. 7 refs., 8 figs. (ERA citation 14:022501)