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Abstract：
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For surface color difference defects on cold-rolled TRIP980 steel,the causes of defects were analyzed through SEM and XRD methods. The results show that the area with color difference defects show the surface broken topography after continuous annealing. Through energy spectrum analysis, compared with normal position, an obvious O element peak is found and there is significant enrichment of Si and O elements in defect position, which is consistent with the analysis result of cold-rolled plate. Through XRD analysis, it is showed that the reason for red scales on the surface of hot coil is that the olivine cannot be removed effectively, resulting in the formation of Fe2O3 in subsequent rolling process. Broken topography on surface is formed after cold rolling because the red scale defect is difficult to be wiped off by pickling.After continuous annealing, the color contrast in the defect and normal areas increase to result in color difference defects finally because the reducing atmosphere and high temperature lead the enrichment of Si and Mn. Thus color difference defects after continuous annealing are the results of several processes, such as hot rolling and acid rolling.Based on the analysis of color difference defects, by optimizing the heating process of slab and enhancing the descaling effect and pickling ability, the color difference defect is controlled effectively.
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Funds：
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AuthorIntro：
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关晓光（1981-），男，硕士，副教授，E-mail：gxg_623@163.com；通讯作者：刘丽萍（1981-），女，硕士，高级工程师，E-mail：liulp2007@126.com
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Reference：
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