板坯连铸结晶器凝固前沿钢液速度、温度和硫含量变化规律  

Change rule of velocity,temperature and sulfur content of molten steel at solidification front in slab continuous casting mold

作　　者：胡增 罗志国 邹宗树 HU Zeng;LUO Zhiguo;ZOU Zongshu(Key Laboratory of Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]东北大学冶金学院多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819

出　　处：《钢铁研究学报》2024年第3期340-347,共8页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(20220358)。

摘　　要：板坯连铸结晶器凝固前沿钢液存在较大的速度梯度、温度梯度及硫浓度梯度,对凝固坯壳捕获气泡及夹杂物有很大影响。采用ANSYS Fluent对板坯连铸结晶器内不同高度处窄面凝固前沿的钢液速度、温度及硫含量分布进行研究。距结晶器自由液面0.1、0.3、0.6 m的截面上平行于X方向位于结晶器中心处的3条截线分别代表结晶器窄面凝固前沿的上部区域、冲击区域和下部区域,对每条线上距凝固前沿3 mm处钢液X方向的速度梯度、温度梯度及硫含量梯度进行计算分析。结果表明:下部区域钢液的速度梯度最大(14.5 s^(-1)),略大于上部区域(14.1 s^(-1)),冲击区域则最小(0.4 s^(-1));下部区域钢液的温度梯度最大(902.3 K/m),约为上部区域的2.0倍,冲击区域的2.4倍;上部区域硫含量梯度最大(0.42%/m),下部区域次之(0.04%/m),冲击区域最小(0.02%/m)。在3个区域中,随着与凝固前沿距离的增大,钢液中的硫含量分布存在2种变化形式:先增大后减小至初始含量值;先减小再增大最后减小至初始含量值。There are significant velocity gradients,temperature gradients,and sulfur concentration gradients in the molten steel at the solidification front of the slab continuous casting mold,which have a significant impact on the capture of bubbles and inclusions in the solidified shell.The velocity,temperature,and sulfur content distribution of molten steel at narrow solidification front at different heights in slab continuous casting mold using ANSYS Fluent was studied.Three cross-sections parallel to the X-direction located at the center of the crystallizer at a distance of 0.1,0.3,and 0.6 meters from the free liquid surface of the mold represent the upper,impact,and lower regions of the narrow solidification front of the mold.The velocity gradient,temperature gradient,and sulfur content gradient of the steel in the X-direction at a distance of 3 mm from the solidification front on each line were calculated and analyzed.The results show that the velocity gradient of molten steel in the lower region is the highest(14.5 s^(-1)),slightly higher than that in the upper region(14.1 s^(-1)),while that in the impact region is the smallest(0.4 s^(-1));the temperature gradient of the molten steel in the lower region is the highest(902.3 K/m),which is about 2.0 times than that of the upper region and 2.4 times than that of the impact region.The sulfur content gradient in the upper region is the highest(0.42%/m),followed by the lower region(0.04%/m),and the sulfur content gradient in the impact region is the smallest(0.02%/m).The distribution of sulfur content in the molten steel has two forms of variation with increasing distance from the solidification front in the three regions:first increase and then decrease to the initial content value,and first decrease,then increase,and finally decrease to the initial content value.

关 键 词：连铸结晶器 凝固前沿 温度场 硫含量分布 

分 类 号：TF777.1[冶金工程—钢铁冶金]