以CSP工艺生产的Q345热轧钢板为研究对象,采用Gleeble-1500D热模拟实验机进行单、双道次轧制模拟实验,研究了稀土铽(Tb)对Q345B钢再结晶行为的影响。结果表明,稀土铽(Tb)能够明显地推迟Q345B钢的动态再结晶,使对应峰值应力在低温轧制时提高约10%,而对980℃以上时的峰值应力影响不明显;980℃以上轧制时,稀土铽(Tb)能够明显的降低间隔时间1.5 s时的静态软化率,但随间隔时间的增加,稀土铽(Tb)对静态软化率的影响减弱;加入稀土铽能够提高完全再结晶区温度,扩大部分再结晶区。 The Q345 hot rolled steel plate produced by CSP process was taken as the research object. Single and double pass rolling simulation experiments were carried out by Gleeble-1500D thermal simulation machine to study the effect of rare earth terbium (Tb) on the recrystallization behavior of Q345B steel. The results show that rare earth terbium (Tb) can obviously postpone the dynamic recrystallization of Q345B steel, and the corresponding peak stress increases about 10% at low temperature, while it does not affect the peak stress above 980 ℃. (Tb) can significantly reduce the static softening rate at 1.5 s, but with the increase of the interval time, the effect of rare earth terbium (Tb) on the static softening rate is weakened. The addition of rare earth terbium can improve the complete recrystallization Zone temperature, expanding part of the recrystallization zone.