大方坯轴承钢GCr15凝固传热数值模拟  

Numerical simulation of solidification and heat transfer in bloom bearing steel GCr15

作　　者：叶玉奎 姚骋 刘宇 王敏 王向红 包燕平 YE Yu-kui;YAO Cheng;LIU Yu;WANG Min;WANG Xiang-hong;BAO Yan-ping(Zenith Iron and Steel Group,Changzhou 213000,Jiangsu,China;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中天钢铁集团公司,江苏常州213000 [2]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《连铸》2020年第6期15-20,共6页Continuous Casting

基　　金：国家自然科学基金资助项目(51774031)。

摘　　要：以某钢厂断面尺寸为280mm×320mm大方坯轴承钢GCr15为研究对象,借助ProCAST软件,建立了二维大方坯凝固传热模型,研究了拉速、比水量、过热度等工艺参数对铸坯凝固过程的影响,同时通过对铸坯中心固相率的研究,确定了与末端电磁搅拌位置、轻压下区间相匹配的最优拉速。结果表明,拉速的变化对铸坯中心固相率、凝固终点位置的影响最大,比水量的影响较大,过热度的影响最小;拉速每增加0.1m/min,凝固终点平均增加1.97m,二冷比水量每增加0.1L/Kg,凝固终点平均减小0.82m,过热度每增加10℃,凝固终点平均增加0.27m。最佳拉速为0.85m/min,此拉速下末端电磁搅拌位置和轻压下区间与铸坯合理的中心固相率相匹配。Taking a slab section was 280 mm×320 mm bloom bearing steel GCr15 as the research object,two-dimensional generous slab solidification heat transfer model was established by using ProCAST software.The paper studied the casting speed,cooling water and degree of superheat on the solidification process of slab,and through the influence on the central solid rate,determined the position of final electromagnetic stirring and the interval of soft reduction under the optimal matching the casting speed.The results show that the change of casting speed has agreat influence on the central solid rate and the position of solidification end point,the influence of cooling water is greater,and the influence of degree of superheat is the least.The solidification end point increases by 1.97 mfor every 0.1 m/min of casting speed,and decreases by 0.82 mfor every 0.1 L/kg of secondary cooling water,and increases by 0.27 mfor every 10℃of degree of superheat.The optimum casting speed is 0.85 m/min.The position of final electromagnetic stirring and the interval of soft reduction match with the reasonable central solid ratio under this casting speed.

关 键 词：轴承钢GCr15 数值模拟 拉速 中心固相率 铸坯凝固 

分 类 号：TF777[冶金工程—钢铁冶金]