The investigations conducted on the effect of molybdenum (Mo) on the precipitation behavior of FB780 steel with the high hole-expanding ratio at different coiling temperatures have been limited. In the present study, base steel without the addition of Mo (Nb–Ti steel) and Nb–Ti–Mo steel with the addition of 0.191% (wt.%) Mo was prepared. Different coiling temperatures were selected on the basis of the process used in industrial production. The results indicated that Mo promoted precipitation at low coiling temperatures, while the volume fraction and size of the precipitates were increased and decreased, respectively, exerting a precipitation strengthening effect. The addition of Mo lowered the optimal coiling temperature, which would be beneficial in terms of energy saving. In addition, Mo reduced the row width of the interphase precipitation and improved the performance stability of the FB780 steel with high hole-expanding ratio.

在不同的卷取温度下，关于扩孔率高的FB780钢对钼（Mo）的析出行为的影响的研究是有限的。在本研究中，制备了不添加Mo的基础钢（Nb-Ti钢）和添加了0.191％（wt。％）Mo的Nb-Ti-Mo钢。根据工业生产中使用的工艺选择不同的卷取温度。结果表明，Mo促进了低卷取温度下的析出，而析出物的体积分数和大小分别增加和减小，发挥了析出强化作用。Mo的添加降低了最佳卷取温度，这在节能方面将是有益的。此外，