Q345R厚板坯连铸凝固过程数值模拟  

Numerical simulation of solidification process for Q345R thick slab continuous casting

作　　者：郑鑫钰 孙彦辉 丰琦 高擎 杨文志[2] 杨建 Zheng Xinyu;Sun Yanhui;Feng Qi;Gao Qing;Yang Wenzhi;Yang Jian(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;Xiangtan Iron&Steel Co.,Ltd.,Hunan Valin,Xiangtan411101,Hunan,China)

机构地区：[1]北京科技大学,钢铁共性技术协同创新中心,北京100083 [2]湖南华菱湘潭钢铁有限公司,湖南湘潭411101

出　　处：《钢铁钒钛》2024年第5期139-146,共8页Iron Steel Vanadium Titanium

摘　　要：为改善湘钢Q345R厚板坯铸坯质量,建立了凝固传热模型,采用射钉试验对模型进行验证和修正。通过数值模拟的方法,对现有的生产工艺进行了评价,并分别研究了拉速、比水量、过热度以及铸坯厚度和宽度对压下位置和压下区间的影响规律,同时研究了其对铸坯角部温度的影响规律。对模拟结果进行分析,理论上得到生产该钢种时合理的连铸工艺参数及铸坯规格,其工艺参数为:断面为450 mm×2270 mm,拉速为0.55 m/min,过热度为15~25℃,二冷比水量为0.26 L/kg。矫直区为Seg.8~9,轻压下区为Seg.13~15。In order to improve the quality of Xianggang Q345R thick slab casting billet,a solidification heat transfer model was established and was verified and corrected by nail shooting experiment.Through numerical simulation,the existing production process was evaluated,and the influence of casting speed,cooling water,superheat,thickness and width of casting billet on the pressing position and pressing interval were studied respectively,and their influence on the corner temperature of the casting billet was studied.The simulation results are analyzed,and the reasonable continuous casting process parameters and billet specifications during the production of the steel grade are obtained as follows:the cross-section is 450 mm×2270 mm,the tensile speed is 0.55 m/min,the superheat is 15~25℃,and the specific water volume of secondary cooling is 0.26 L/kg,the straightening zone is Seg.8~9,and the light pressure area is Seg.13~15.With these casting parameters applied,the center segregation of the slab and the crack defects in the corners can be effectively controlled.

关 键 词：连铸 压力容器钢 厚板坯 射钉试验 数值模拟 轻压下 中心偏析 边角部裂纹 

分 类 号：TF76[冶金工程—钢铁冶金]