论文部分内容阅读
本研究证明了连铸板坯皮下小气泡的成因,并通过水模型模拟试验,研究了结晶器内弯液面下钢流对气泡残留分布的影响。结论概述如下。1)气泡的气体成份有:N_2、Ar、H_2以及 CH_4。各种气体成份分别来源于渗漏进去的空气,从滑动水口吹入的 Ar 气,弥散于钢水中的氢气,含于滑动水口耐火材料中的焦油。2)铸造时间越长,从水口渗漏进去的空气越多,漏进去的空气量为10～550Ncm~3/S。3)含 N_2气的气泡比含 Ar 的气泡小,这主要在板坯宽幅方向的中心部位发现。4)在板坯宽幅方向的气泡分布状态取决于气泡的尺寸和弯液面之下钢水的流动。S)使用气密式滑动水口可减少板坯宽幅方向中心表皮之下气泡的数量。
The research proves the cause of sub-bubbles in the continuous casting slab and studies the influence of the steel flow under the meniscus in the mold on the bubble residual distribution through the water model simulation test. The summary is as follows. 1) The gas composition of the bubble: N_2, Ar, H_2 and CH_4. The gas components come from air leaking in, Ar gas blown from the sliding nozzle, hydrogen diffused in the molten steel, and tar contained in the sliding nozzle refractory. 2) The longer casting time, the more air leaked in from the nozzle, the amount of air leaked in is 10-550Ncm-3 / S. 3) Bubbles containing N 2 gas are smaller than Ar-containing bubbles, which are mainly found in the center of the slab in the direction of width. 4) The bubble distribution in the direction of the slab width depends on the size of the bubble and the flow of molten steel below the meniscus. S) The use of air-tight sliding nozzles reduces the amount of air bubbles beneath the center skin in the direction of the slab width.