Continuous steel casting process

摘要

A continuous steel casting process adapted to produce steel castings of satisfactory quality with less center segregations is described. A molten steel is electromagnetically stirred in at least two of three locations, viz., a casting mold and intermediate and final solidifying zones of a continuously cast strand. In the casting mold, is applied a magnetic field induced by alternate current of a frequency f=1.5 DIFFERENCE 10 Hz and having G in the range of 195xe-0.18f DIFFERENCE 1790xe-0.2f at the inner surface of the casting mold. The intermediate solidifying zone employs a magnetic field induced by alternate current of a frequency f=1.5 DIFFERENCE 10 Hz and having a magnetic flux density G in the range of 195xe-0.18f DIFFERENCE 1790xe-0.2f at the surface of the strand or a magnetic field induced by alternate current of a frequency f=50 DIFFERENCE 60 Hz and having a magnetic flux density G in the range of 0.6x106/(D-107)2 DIFFERENCE 1.8x106/(D-100)2 (in which D=the thickness of a solidified shell layer of the strand) at the surface of the strand. For electromagnetic stirring in the final solidifying zone, a magnetic field induced by alternate current of a frequency f=1.5 DIFFERENCE 10 Hz and having a magnetic flux density in the range of 895xe-0.2f DIFFERENCE 2137xe-0.2f is applied.