重点对超低碳钢热轧盘条表面产生环形粗晶组织的原因进行了分析.环形粗晶组织的深度达到l 000 μm左右,晶粒尺寸达到60 ～ 80 μm,均匀分布于盘条表层,不存在特定取向晶粒异常长大的特点.通过退火模拟实验分析发现,超低碳钢热轧盘条表面环形粗晶组织具有一定的遗传性,会严重恶化材料的塑性加工性能.经理论分析和工艺试验验证,超低碳钢热轧盘条表面环形粗晶的产生原因主要是预精轧后水冷强度过大,温度没有充分恢复,盘条表面温度低于动态相变温度,在盘条表层的晶粒内部储存有大量的能量,这些能量促进铁素体相变的发生和特定取向的晶粒长大与扩张,最终形成粗晶组织.通过调整预精轧水冷工艺,将超低碳钢热轧盘条进入精轧的温度稳定控制在920℃以上,能够明显降低表面环形粗晶组织的发生.
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