在板坯轧制过程中，由于某些因素的影响，使板坯在粗轧阶段的工艺参数发生变化，如冷却不均匀，使板坯两侧存在温度差、板坯具有楔形及在咬入过程中偏离轧辊中心线等，都会使板坯产生侧弯现象。
In bar rolling process, the technical conditions of roughing may change and make camber occurred, for example, different temperature at both bar side, bar wedge and off-center in biting.
薄板坯连铸连轧粗轧阶段的动态软化率接近于1。
Dynamic recrystallization fraction is close to 1 during rough rolling;
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