PURPOSE: To eliminate inclusions and subsurface flaws and make surface characteristic aesthetic by subjecting the specific molten steel to electromagnetic induction stirring by the magnetic field induced by the AC of specific frequencies and magnetic flux in a mold.
CONSTITUTION: The molten steel contg. ≤0.25% C is beforehand prepared in a converter or ladle, and this molten steel is subjected to cleaning treatment, thence it is supplied together with flux into a mold for casting. At the time of performing non-oxidative casting in the mold, the molten steel is subjected to electromagnetic induction stirring by the magnetic field induced by applying the AC of frequency f=1.5W10.0Hz and G(gauss) defined by 195×e-0.18f≤G≤1790×e-0.20f to the electromagnetic device provided to the inside surface of the mold. It is successively drawn out continuously in the downward direction of the mold, and in the state of reduced inclusion. It is solidified, whereby the low-carbon killed steel of good quality is obtained.
HANAZONO TAKESHI
TAKAGI WATARU
SAITOU TADASHI
OONISHI TOSHIYASU
