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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。
Non-oriented electrical steel W800 substrate plate in the hot rolling process pits and holes quality defects, using chemical composition detection and metallographic microstructure analysis of a series of analysis. The results show that the defects of this type of hot-rolled substrate are due to the impact and friction of the side guides of the finish rolling mill during the strip rolling, resulting in a lot of external foreign bodies that fly to the plate surface and are pressed Plate surface, and then fall off to form a plate surface pits; as the strip frequently hit the side guide, leading to the formation of the edge of the strip gap, while the side guide plate partially broken into small pieces, and pressed into the strip, after rolling, Hole defects were generated due to inconsistent deformation.