汽车钢板表面线状缺陷控制技术  

Control technology of surface sliver defects for automobile steel sheets

作　　者：苑鹏[1,2] 李海波 陈斌[1,2] 朱克然 裴兴伟[3] 姜仁波 YUAN Peng LI Hai-bo CHEN Bin ZHU Ke-ran PEI Xing-wei JIANG Ren-bo(Sheet Metal Research Institute, Shougang Research Institute of Technology, Beijing 100043, China Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043 Shougang Qian＇an Steel Company, Qian＇an 064404, Hebei, China)

机构地区：[1]首钢集团总公司技术研究院薄板研究所,北京100043 [2]绿色可循环钢铁流程北京市重点实验室,北京100043 [3]首钢股份公司迁安钢铁公司,河北迁安064404

出　　处：《钢铁研究学报》2017年第10期800-806,共7页Journal of Iron and Steel Research

摘　　要：针对线状缺陷是制约汽车钢板表面品质的关键问题,对汽车钢种热轧板和冷轧板的表面缺陷进行SEMEDS分析。研究发现保护渣是引起汽车板线状缺陷的主要原因。提高钢液洁净度可以缓解水口堵塞,进而减少保护渣卷入与内壁大尺寸夹杂物脱落,此外优化结晶器流场也可以防止卷渣的发生。某钢厂通过工艺优化,使加铝前钢液溶解氧降低明显,并有效减少连铸过程钢液的二次氧化,提高了钢液洁净度。此外还通过对浸入式水口结构进行优化,降低了结晶器上回流强度,使液面波动明显减小。采取上述工艺优化,轧板表面线状缺陷的发生率显著降低。For challenge of sliver defects restricting surface quality of automobile steel sheets,the surface defects on hot rolled sheets and cold rolled sheets of automobile steel were analyzed by SEM-EDS.The results show that mold fluxes are the main causes of sliver defects of automobile steel sheets.Improving the cleanliness of molten steel can alleviate nozzle clogging,thereby the entrapped slags in the mold and the large size inclusions which dropped from inner will decrease.In addition,slag entrapment in the mold would also be prevented by optimizing the flow field.By the optimized process in a steel mill,dissolved oxygen content in molten steel before aluminum addition obviously decreases and reoxidation of molten steel during casting process significantly reduces,and the cleanliness of molten steel is improved.In addition,through the optimization of submerged nozzle structure,intensity of up flow in the mold declines and level fluctuation of liquid obviously decreases.Through the above optimized processes,surface sliver defects on rolled sheets significantly declines.

关 键 词：超低碳钢 线状缺陷 洁净度 结晶器流场 

分 类 号：TF76[冶金工程—钢铁冶金] TG335.5[金属学及工艺—金属压力加工]