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A Study on Demagnetization Technique of a Steel Tube using an Anhysteretic Magnetization  

Kim, Young-Hak (Pukyong National University)
Yang, Chang-Seob (Agency for Defense Development)
Shin, Kwang-Ho (Kyungsung University)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.12, no.1, 2009 , pp. 24-28 More about this Journal
Abstract
In this study, we investigated whether the anhysteretic demagnetization process would be applicable to remove a complicated magnetization of a steel tube as a part of the experimental earlier study for a deperming of naval vessel. The magnetic tube used in this study was a 10cm-long and 1cm-diameter steel tube, and magnetized with a E-shape ferrite core to form a nonuniform magnetization in it. In the anhysteretic demagnetization process, a dc magnetic field applied along the longitudinal direction of the tube decreased from ${\pm}$3kA/m to zero-field with the step of ${\pm}$300A/m. At the same time, an ac bias magnetic field with the frequency of 60Hz and the field intensity of 300A/m was excited along the circumstantial direction of the tube. It was found that the anhysteretic process was useful to demagnetize a small-object like a steel tube from the experimental results showing the residual magnetization reduced over 90%.
Keywords
Deperming; Anhysteretic Demagntization; Residual Magnetization;
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