无取向电工钢W800基板在热连轧轧制过程中板面出现凹坑和孔洞质量缺陷,采用化学成分检测和金相微观组织分析法进行了系列分析。结果表明,该类热轧基板的凹坑缺陷是由于板带轧制时撞击和磨擦精轧机组的侧导板,生成了不少外部异物,飞落到板带板面,经后续轧制压入板带表面,然后又脱落形成板面凹坑;由于带钢频繁撞击侧导板,导致板带边部形成裂口,同时侧导板局部断裂成小块,并压入带钢,经后续轧制时,因形变不一致生成了孔洞缺陷。
Dimple and cavity defects will appear on the W800 hot-rolled strips when being rolled of non-oriented electrical steel W800 plate,the causes were analyzed by the metallographic and chemical components analysis.The results show that the dimple defects were generated from the external abnormal substances with the strip impacting and rubbing the side guide plates,a lot of external abnormal substances were produced on the surface of strip,hence the external abnormal substances were rolled into the strip surface and peeled off when coiled.The edge breach defects resulted from the impacts between the strip and the side guide plates and the cavity defects from the external small grain abnormal substances rolled into the strip with inconsistent deformation.
参考文献
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