16MnNb中厚钢板控轧工艺的试验研究

通过热模拟和轧制试验,测定了16MnNb钢再结晶软化率与道次变形量及间隔时间的关系;确定出16MnNb中厚钢板控轧时的精轧温度区间和道次变形量分配原则;所提控轧工艺对含铌Q345钢同类品种板的生产有参考价值。

Prediction of Deformation-Induced γ→α Transformation of 16MnNb Steel

Based on the nucleation and growth theory together with the influence of deformation on driving force and nucleation site,a numerical model was developed for predicting deformation-induced transformation(DIT).The numerical results of DIT of 16 MnNb steel was presented and compared with the experimental ones.The calculated results are in agood agreement with the experimental ones,and the best calculated result is obtained when the constantα=0.25 for steel 16 MnNb.

16MnNb钢圆坯连铸二冷制度的研究

以某钢厂圆坯连铸机为研究对象,建立了连铸坯凝固传热模型。在不同拉速下对280 mm断面圆坯二次冷却过程进行仿真优化,确定了16MnNb钢合适的二冷制度。根据仿真结果,在最小工作拉速(0.9 m/min)下,矫直点处铸坯内弧表面中心温度为947℃,有效避开了铸坯的二次低延性区。在最大工作拉速(1.2 m/min)下,铸坯出结晶器时,其凝固坯壳厚度为19 mm,二冷初期产生漏钢等质量问题的可能性较小。不同拉速下,横断面温度场分布均匀。经低倍检测发现,铸坯表面及内部质量良好,无裂纹、疏松、缩孔等质量缺陷。