| 摘要 |
PURPOSE:To prevent the intrusion of the solidified shell of a molten metal formed in the meniscus part into a steel ingot in the stage of producing a thin sheet-like steel ingot from the molten metal by two rotary drums by disposing heatint refractories to the molten metal meniscus part of the rotary drums and applying ultrasonic oscillation to the molten metal between the drums. CONSTITUTION:The molten metal 4 is supplied from a tundish 5 by an immersion nozzle 6 to the space formed of the internally water cooled rotary drums 1, 1' and stationary gates 2, 2' and the thin sheet-like steel ingot 3 is drawn out by rotating the drums 1, 1' backward. The refractories 9 which can be internally heated are disposed to the meniscus part of the molten metal in the above-mentioned space between both drums and the molten metal is stirred by an electromagnetic stirrer 8; at the same time, the ultrasonic oscillation is applied to the molten metal by an ultrasonic oscillator 10. The surface solidified shell is made hardly formable on the molten metal is the meniscus part by the presence of the heated refractories. Even if such shell is formed, the shell connects to the solidified shell formed on the surfaces of the drums 1, 1' and is no intruded into the thin sheet-like steel ingot. The quality of the steel ingot 3 is thus not affected by such solidified shell. |
