| 摘要 |
PROBLEM TO BE SOLVED: To accurately control to a targeted sol.Al value, when an Al-killed steel cast slab is produced by adding Al into molten steel in a mold while pouring the molten steel in an open molten steel pouring system. SOLUTION: In a method for producing the Al-killed steel cast slab by adding an Al wire 8 into the molten steel in the mold 3 while pouring the molten steel 4 containing no Al with the open molten steel pouring system, the total oxygen quantity in the molten steel before pouring the molten steel in the mold, is measured. The Al wire is added into the molten steel based on the Al charging quantity calculated with (1) equation from the measured total oxygen quantity, the sol.Al targeted value and the casting quantity of the molten steel into the mold. Wherein, in the (1) equation, R: the charging quantity of Al (kg/min), A: the targeted value of sol.Al (mass%), T.O: the total oxygen quantity in the molten steel before pouring the molten steel into the mold (mass%),α: reaction ratio of SiO2-MnO and Q: the casting quantity of the molten steel (kg/min). R=[A+(54/48)×α×(T.O)]×Q/100...(1).
|
