合金化热镀锌IF钢板表面短白条缺陷产生原因及演变机理研究  

Research on the cause and evolution mechanism of short white stripe defect on the surface of alloyed hot-dip galvanized IF steel sheet

作　　者：吕利达 陈广兴 刘少先 LYU Lida;CHEN Guangxing;LIU Shaoxian(Baosteel Zhanjiang Iron&Steel Co.,Ltd.,Zhanjiang 524000,Guangdong,China)

机构地区：[1]宝钢湛江钢铁有限公司,广东湛江524000

出　　处：《宝钢技术》2024年第5期41-46,共6页Baosteel Technology

摘　　要：使用扫描电子显微镜、能谱仪等设备,分析了一种合金化热镀锌IF钢GA外板表面短白条缺陷的产生原因,同时对热卷表面的黑线缺陷、板坯表面的渣孔缺陷进行了分析。结果表明:短白条缺陷形成的直接原因与Al_(2)O_(3)夹杂有关,根本原因为板坯表面的渣孔缺陷。由于炼钢吹氩气泡大,且镇静时间较短,部分携带有Al_(2)O_(3)夹杂的氩气泡来不及上浮至表面,停留在钢中未被去除,在经过轧制延伸并镀锌后,在钢板表面形成短白条缺陷。讨论了该缺陷的演变机理,提出通过改善吹氩方式,采用更多尺寸较小的氩气泡,能更好地去除微小夹杂物,同时降低板坯渣孔的发生率。By using a scanning electron microscope,an energy spectrometer and other analytical equipment,the causes of short white strip defect on the surface of GA outer plate of an alloyed hot-dip galvanized IF steel were analyzed.At the same time,the black line defect on the hot coil surface and the slag hole defect on the slab surface were also analyzed.The results indicate that the direct cause of these defects is associated with the aluminum oxide inclusions,while the root cause stems from the slag hole defect on the slab surface.The evolution mechanism of this defect is discussed.Due to the large size of argon bubbles in steelmaking and the short holding time,some argon bubbles carrying aluminum oxide inclusions do not have enough time to rise to the surface and therefore remain in the steel without being removed.After rolling,stretching and galvanizing,the short white strip defect forms on the surface of the galvanized sheet.Furthermore,it is proposed that by improving the argon blowing method and adopting more argon bubbles with smaller size,the removal of tiny inclusions can be better,and the occurrence rate of slag holes can be reduced.

关 键 词：锌铁合金镀层钢板 Al_(2)O_(3)夹杂 氩气泡 短白条缺陷 

分 类 号：TG115[金属学及工艺—物理冶金]