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针对CSP工艺轧制含Nb、V微合金钢时采用的“机架空过”工艺，本文在采用实测轧制数据验证组织演变模型的基础上，模拟了F2和F3机架空过工艺对组织演变和平均流变应力(MFS)的影响。结果表明，对本文模拟的钢种，与常规轧制工艺相比，在不降低道次温度的情况下，采用F2机架空过时，可避免混晶，且各道次平均流变应力波动较小。而采用F3空过时，易产生混晶，平均流变应力波动较大。

After microstructure evolution model was validated by measured rolling data, effect of F2 or F3 “dummy-off “on microstructure evolution and mean flow stress(MFS) of Nb，V bearing steel produced by CSP was simulated in this paper. Simulating results show that the mixed-grain could be avoided by using F2 “dummy-off” in comparison with conventional rolling schedule while the same pass rolling temperature was maintained. Mixed grain may be produced when F3 “dummy-off “ was used, and MFS varied much more than that when F2 “dummy-off “ was used.