| 摘要 |
PURPOSE:To reform slag with high efficiency without increasing a process by blowing a slag reducing agent to the slag under discharge from the top end of a stopper charged preliminarily into a vessel at the end period of tapping a molten steel from the vessel. CONSTITUTION:A slag reforming material such as Al is discharged from a powder discharge hole 6' after the discharge of slag 3 before reforming from a tap hole 2 is confirmed at the end period of tapping from a vessel for a molten steel, for example, a converter 1. A stopper body 5 is immersed into the slag 3 before reforming at the same instant and powder is injected toward the center of the hole 2. A specified amt. of slag 13 is assured in a ladle 11, then a stopper driver is actuated so that the hole 2 is closed by a stopper head 4. The slag is reformed with high efficiency without increasing the treating process and the acceptance rate for absence of sliver flaws of a cold rolled steel sheet is increased by the above-mentioned method. |
