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| Origin analysis and improvement measures for striped color defects of 780 MPa grade dualphase steel |
| ZHANG Liang-liang1,2，LI Yan1,2，YU Yang1,2，GAO Xiao-li1,2，SUN Chao-fan1,2，QI Da3 |
（1. Thin Strip Department， Shougang Research Institute of Technology， Beijing 100043， China
2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology， Beijing 100043， China
3. Department of Cold Rolling Operation， Shougang Jingtang Iron and Steel Company，Tangshan 063200， Hebei， China） |
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Abstract The microscopic characteristics of serious color defects on the surface of 780 MPa grade dual-phase steel strip were systematically investigated. The surface condition of defects were studied through SEM and EPMA analysis methods. The results show that the area with color defect was rough and the surface shows the broken topography and there was a positive correlation between the broken intensity and the severity of the color defects. EDS and EPMA proved the existence of slightly oxidization at the broken area. The surface enrichment of the defects was analyzed through GDOES analysis， and the severity of striped color defect was closely related to the depth of enrichment（mainly Si and Mn） peak from the surface. Combined with hot-rolled section analysis， the enrichment has already existed in the form of olivine and its macroscopic state was the red scale defect. The red scale defect was difficult to be wiped off after pickling， the broken intensity and the enrichment depth showed many differences on the surface in different areas after cold-rolling， which finally formed the striped color defects on the surface of annealing plate. Based on the origin analysis， the measurements for hot and cold rolling production have been proposed， which ultimately reduced or eliminated the formation of striped color defects.
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Received: 16 May 2016
Published: 13 January 2017
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2017, Vol. 52 
