热轧相变过程变形抗力模型研究与开发

Research and development of deformation desistance model for phase transformation process of hot-rolled strips

对精轧阶段存在相变的热轧钢种,因变形抗力随轧制温度的变化规律与常规的奥氏体轧制钢种显著不同,使得传统变形抗力模型的预报误差较大,严重影响这类钢种的轧制稳定性。为此,研发了一种热轧相变过程变形抗力模型,通过在原变形抗力模型基础上添加一个新的相变趋势项,该修正项为轧制温度的二次多项式函数,并根据钢种分类来精细优化适应不同钢种轧制的多项式待定参数。该模型目前已成功应用于涟钢CSP热连轧生产线变形抗力在线计算,实际生产应用表明,新模型上线后,变形抗力与轧制力的预报精度显著提高,轧制力模型预报误差12%以内的比例从83.3%提高到96.7%,满足了热连轧精轧相变带钢的稳定生产要求。

For the hot-rolled strip with phase transformation process existing in finishing rolling stage,its variation laws of deformation resistance with rolling temperature are significantly different from that of conventional austenitic rolled strip,which makes the prediction error by the traditional deformation resistance model relative large and affects the rolling stability seriously. Therefore,a new model of deformation resistance during hot rolling phase transformation process was developed. A new phase transformation trend term that was a quadratic polynomial function of rolling temperature was added on the basis of the original deformation resistance model,and the undetermined parameters of different steel grade are fine optimized according to the steel grade classification. This model is applied to online calculation for the prediction of deformation resistance in Lianyuan steel CSP production line. The practical application shows that the prediction accuracy of deformation resistance and roll force is significantly improved after using the new built model. Then the proportion of predicted roll force within the prediction error of 12% increased from 83.3% to 96.7%,which meet the rolling stability requirements of these hot rolled strips with phase transformation during finishing rolling process.