采用S-4800场发射扫描电子显微镜、能谱仪、金相显微镜等仪器对钢板表面线状缺陷的形成原因进行分析与探讨.结果表明:铸坯划伤、夹杂、铸坯裂纹是引起钢板表面线状缺陷的主要原因.铸坯裂纹与铸坯划伤引起的钢板线状缺陷往往在缺陷处可观测到一薄层高温氧化铁,附近分布着大量细小高温氧化圆点,且有脱碳迹象,而夹杂引 起的线状缺陷可在缺陷处检测到保护渣特征元素Na和K.为减少钢板表面线状缺陷,针对相关原因提出了相应的改进措施,对实际生产具有一定的指导意义.
Scanning electron microscopy along with energy dispersive spectroscopy and optical metallographic microscope were employed to analyze the cause of formation of sliver defects on the surface of steel plate.The results show that the main reasons for the sliver defect of steel plate surface are the scratch,inclusion and crack of the slab.A thin layer of high temperature oxidation,a large number of small high temperature oxidation dots and signs of decarburization can be observed at the defects caused by Casting slab crack and scratch,while Na and K elements can be detected in the linear defect caused by inclusion.In order to reduce the linear defect on the surface of the steel plate,the author puts forward the corresponding improvement measures for the relevant reasons,which has certain reference for the practical production.
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