汽车钢板表面线状缺陷控制技术

发布时间：2018-04-21 06:32

  本文选题：超低碳钢 + 线状缺陷　； 参考：《钢铁研究学报》2017年10期

【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。
[Abstract]:The surface defects of hot rolled and cold rolled automobile steel plates are analyzed by SEMEDS in view of that linear defects are the key problems that restrict the surface quality of automobile steel plates. It is found that mould powder is the main cause of linear defect of automobile plate. Improving the cleanliness of molten steel can alleviate the clogging of the nozzle and reduce the involvement of the mold powder and the falling off of the large size inclusions in the inner wall. In addition, optimizing the flow field of the mold can also prevent the occurrence of the slag entrainment. By optimizing the process, the dissolved oxygen of molten steel can be reduced obviously, and the secondary oxidation of liquid steel can be reduced effectively during continuous casting, and the cleanliness of liquid steel will be improved. In addition, by optimizing the structure of submerged nozzle, the reflux intensity on the mold is reduced, and the fluctuation of liquid surface is obviously reduced. By using the above process optimization, the incidence of linear defects on the surface of the rolling plate is significantly reduced.
【作者单位】： 首钢集团总公司技术研究院薄板研究所;绿色可循环钢铁流程北京市重点实验室;首钢股份公司迁安钢铁公司;
【分类号】：TF76;TG335.5
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本文编号：1781313