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结合某钢厂FTSR薄板坯连铸连轧生产线轧制X46含Nb钢的工艺参数,在Gleeble-2000热/力模拟实验机上模拟了粗轧阶段该钢的组织演变,并研究了Nb含量对未再结晶温度的影响。研究结果表明:①粗轧阶段,粗大的铸态组织发生了充分的动态再结晶,有效地细化了奥氏体晶粒。②随着钢中Nb含量的增加,未再结晶温度逐渐升高,该生产线可有效进行控制轧制,避免轧制含Nb钢时混晶现象的发生。
Combined with the technological parameters of X46 Nb-containing steel rolled by FTSR thin slab continuous casting and rolling production line in a steel mill, the microstructure evolution of the steel during rough rolling was simulated on Gleeble-2000 thermal / The effect of recrystallization temperature. The results show that: (1) In the rough rolling stage, the coarse as-cast microstructure undergoes sufficient dynamic recrystallization to refine the austenite grains effectively. ② With the increase of Nb content in steel, the non-recrystallization temperature gradually increases. The production line can effectively control the rolling and prevent the occurrence of mixed grain during the rolling of Nb-containing steel.