ELECTROMAGNETIC STIRRING IN CONTINUOUS METAL CASTING

摘要

A method is disclosed of electromagnetically stirring molten metal in an unsolidified portion of a continuously cast strand by means of a magnetic field formed by applying alternating current to at least one set of exciting coils. One of the exciting coils is supplied with a first alternating current of a frequency in the range of from 1 to 60 Hz. Another of the exciting coils is supplied with a second alternating current at a frequency which differs from the frequency of the first alternating current by a frequency difference in the range of from 0.03 to 0.25 Hz. A varying composite magnetic field is thereby formed which induces stirred movement of varying direction and intensity in the molten metal.