论文部分内容阅读
针对唐钢FTSC薄板坯连铸连轧线生产SS400热板卷的轧制孔洞缺陷,对连铸坯的低倍组织、铸坯温度分布和动态软压下工艺进行了研究。结果表明:铸坯存在内部横裂纹和疏松缺陷,内部裂纹产生在0扇形段,裂纹处硫元素呈正偏析;铸坯内部裂纹和疏松缺陷在后续轧制中不能够焊合,是导致轧制孔洞缺陷的直接原因。通过优化动态软压下参数,将压下终点向前提和减小0扇形段的压下量;增加二次冷却强度,提高冷却均匀性;提高钢水质量、加强设备精度管理和推进恒拉速操作,可以完全避免中碳钢SS400热轧板卷轧制孔洞缺陷的产生。
Aiming at the defects of the rolling holes of SS400 hot coil produced by FTSC thin slab continuous casting and rolling line in Tangshan Iron and Steel Co., Ltd., The research on the microstructure, temperature distribution and dynamic soft reduction of slab was carried out. The results show that there are internal transverse cracks and loose defects in the slab. The internal cracks occur in 0 sectors and the elemental sulfur in the cracks is positively segregated. The internal cracks and loose defects in the slab can not be welded during subsequent rolling. The direct cause of the defect. By optimizing the parameters of dynamic soft pressure, the end point of reduction is advanced and reduced by the reduction of 0 sector, the secondary cooling intensity is increased, the cooling uniformity is improved, the quality of molten steel is enhanced, the precision management of equipment and the promotion of constant pulling speed operation , Can completely avoid the carbon steel SS400 hot rolled coil hole defects.