倒角大方坯连铸过程的温度场模拟分析

Simulation Analysis of Temperature Field in Chamfer Bloom Continuous Casting Process

采用有限元分析软件建立了82B大方钢坯凝固传热分析有限元模型,建立了满足现场工艺和设备条件下的凝固传热数学模型,分析了直角坯与倒角坯在凝固过程中的温度场分布情况。结果表明,采用倒角结晶器生产的大方坯,其角部温度在出结晶器后比直角坯高62℃,出二冷区后比直角坯高35℃,空冷结束后比直角坯高43℃,较高的角部温度避开了钢材的第Ⅲ脆性区间,使铸坯在矫直段角部裂纹的发生率降低,且对后续的轧制过程同样有利。在生产中,倒角坯最佳的倒角形状是倒角为35°,倒角面长度为50mm。

The finite element model of solidification heat transfer analysis of 82Bbloom was established by using finite element analysis software.The temperature field distribution of right-angle bloom and chamfer bloom during solidification process was calculated,and the solidification heat transfer mathematical model was established under the conditions of field technology and equipment.The results show that the angle temperature of the bloom produced by the chamfer mold is 62℃ higher than that of the right-angle bloom after exiting the mold,35℃ higher than that of the right-angle bloom after exiting the secondary cooling zone,43℃ higher than that of the right-angle bloom after air cooling.In addition,the higher angle temperature can avoid the third brittle zone (700~900℃)of the steel,thus reducing the occurrence rate of corner cracks of the bloom in the straightening section and being also beneficial to the subsequent rolling process.In production,the desirable chamfer shape of chamfer bloom is chamfer angle of 35°and chamfer surface length of 50mm.