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1.前言在冷轧板带生产中,由传统的罩式炉退火工艺改为连续退火工艺以后,对某些钢种(如SPCC、SPCD)的冷轧坯料,要求其热轧时的卷取温度,由原来的≤650℃提高至≥750℃。但由此将会使热轧钢板表面的铁素体晶粒比钢板中心部位粗大,而造成晶粒异常不均现象。这种晶粒的异常不均不仅影响到下部工序的进一步加工,而且会使冷轧后轧件的深冲等机械性能恶化。因此,对低碳钢SPCC、SPCD热连轧板表面铁素体晶粒异常粗化的生产工艺进行了模拟试验,以期
1. Introduction In the cold-rolled strip production, from the traditional bell furnace annealing process to a continuous annealing process, some of the steel grades (such as SPCC, SPCD) of the cold-rolled blank, requiring hot-rolling Temperature, from the original ≤ 650 ℃ increased to ≥ 750 ℃. However, the ferrite grains on the surface of the hot-rolled steel sheet will be coarsened more than the central part of the steel sheet, thereby causing anomalous grain anomalies. Such irregularities in the crystal grains not only affect further processing of the lower process, but also deteriorate the mechanical properties such as deep drawing of the rolled product after cold rolling. Therefore, the production process of abnormal ferrite grain coarsening on the surface of mild steel SPCC and SPCD hot strip has been simulated,