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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。
Aiming at the linear defect, the key issue that restricts the surface quality of automotive steel sheets, the SEMEDS analysis of the surface defects of automotive steel hot-rolled and cold-rolled steel sheets was carried out. Study found that mold flux is the main cause of linear defects of the car plate. Increasing the cleanliness of the molten steel can ease the blockage of the nozzle, thereby reducing the involvement of the mold flux and the large-size inclusions in the inner wall. In addition, optimizing the mold flow field can also prevent the occurrence of scum slag. A steel mill through the process optimization, so that molten aluminum before adding aluminum reduced significantly reduced, and effectively reduce the secondary oxidation of molten steel in the continuous casting process to improve the liquid steel cleanliness. In addition, by optimizing the structure of the submerged nozzle, the backflow intensity on the crystallizer is reduced, and the fluctuation of the liquid surface is obviously reduced. Taking the above process optimization, the incidence of linear defects on the surface of rolling plate is significantly reduced.