82B小方坯凝固组织和偏析预测模型开发及应用

Development and application of prediction model for solidification structure and segregation of 82B billet

基于国内某厂82B小方坯连铸生产过程,使用ProCAST软件建立82B小方坯铸坯横断面宏观偏析模型,从温度场、坯壳厚度和凝固组织3个方面验证该模型的正确性,通过该模型研究连铸参数(拉速、比水量和过热度)对铸坯横断面宏观偏析的影响。模拟结果表明,82B连铸坯中心偏析随拉速和过热度的增加而增大,而比水量对中心偏析的影响较小。减轻铸坯中心偏析的关键在于控制铸坯拉速和过热度,因此为了保证铸坯中心碳偏析不高于1.10,应控制铸坯拉速低于2.64 m/min,过热度不高于10℃。

Based on a domestic factory 82 B small billet continuous casting production process,the ProCAST software was used to build 82 B small billet slab macrosegregation in cross-section model,the temperature field,shell thickness and solidification organization three aspects to verify the correctness of the model,through the model the continuous casting parameters(casting speed,cooling water flows and superheat)on the cross-section of slab macrosegregation.The simulation results show that the center segregation of 82 B continuous casting billet increases with the increase of casting speed and superheat,but the cooling water flows amount has little effect on the center segregation.The key to reduce the carbon segregation in the center of the billet is to control the casting speed and superheat.Therefore,in order to ensure that the carbon segregation in the center of the billet is not more than 1.10,the casting speed should be controlled below 2.64 m/min and the superheat should not be more than 10℃.