Research and Cause Analysis of Surface Defects of Cold Rolled Strip Steel
Macroscopic examination,scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS)were used to observe the macroscopic and microscopic structure morphologies of the defects in cold rolled strip steel,and the composition of the defects was analyzed.The results show that the fracture defect is due to the formation of Si and Al2O3 inclusions,resulting in cracks.Bubbles or inclusions attached to the bubbles can cause peeling defects of cold rolled sheet.Due to the rupture of bubbles on the surface of the billet during rolling,the internal iron matrix is oxidized,and the peeling defect is caused by the deformation of the cold rolling.
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