40Cr大方坯凝固传热行为研究  

Solidification and heat transfer behaviors of 40Cr steel bloom

作　　者：程常桂[1] 齐士兵[1] 陈雄[1] 金焱[1] 钟保军 蔡士中[2] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]邢台钢铁有限责任公司技术中心,河北邢台054027

出　　处：《武汉科技大学学报》2013年第4期241-245,共5页Journal of Wuhan University of Science and Technology

摘　　要：针对某钢厂40Cr大方坯连铸工艺生产条件,建立二维非稳态传热模型,利用射钉实验结果修正传热模型。传热模型计算分析结果表明,工况配水方案下,二冷一区、二冷二区回热速率偏高,铸坯出结晶器坯壳厚度较厚,结晶器冷却强度有降低空间;随距铸坯表面中心距离的增大,铸坯内温度梯度逐渐减小,到铸坯中心区域,温度梯度差异很小;随距弯月面距离的增大,铸坯表面到中心连线上某一相同位置的温度梯度先逐渐减小,后逐渐增大;随冷却强度增大,铸坯柱状晶向等轴晶转变区域温度梯度增大,但单纯增大二冷五区冷却强度,温度梯度增大效果不明显。In light of continuous casting technological conditions for producing 40Cr steel bloom, two- dimensional unsteady heat transfer model had been established, and this model had been corrected by the pin-shooting experimental data. The results show that the regenerative rate on bloom surface in the first and second partition of secondary cooling zone is higher under the actual water distribution. The bloom shell at the outlet of mould is thicker, and the intensity of cooling for the mould can be further reduced. The temperature gradients in the bloom are reduced gradually with distance from the center of bloom surface, and the temperature gradients in the central areas of bloom vary little. The temperature gradient at the same distance from bloom surface decreases first and then increases gradually with distance from the meniscus area. With the increase of cooling intensity, the temperature gradients in columnar-to-equiaxed transition of bloom increase. The increase of temperature gradients is not obvious by only increasing the cooling intensity in the fifth partition of secondary cooling zone.

关 键 词：连铸 40Cr 大方坯 凝固 传热行为 

分 类 号：TF777.2[冶金工程—钢铁冶金]