Mechanism analysis and research measures of residual stress-related plate shape defects in hot rolled strip
ZAN Xian-liang1,2, WANG Feng-qin1, LIU Zi-ying1, LI Fei1, GUO Wei1, MIAO Cheng-liang3
1. Metallurgical Process Research Institute, Research Institute of Technology of Shougang Group Co., Ltd., Beijing 100043, China; 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China; 3. Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China
Abstract：The residual stress-related plate shape defects are summarized and classified into two categories: buckling and warping according to the production mechanism, camber and C warp were typical representative defects of buckling and warping. It was found that the wave and the camber had a corresponding relationship. By analyzing the current situation of the visible wave shape and the invisible wave shape, it was found that there was a manual modification of the target crown setting value. A three-dimensional finite element model of the temper mill was established, and the stress distribution of the different strip crowns after rolling was compared and analyzed. By adopting the "small crown + non-rolling through the temper" measure, the average value of the camber defects was reduced from 15.2 to 4.97 mm. Due to the lower support roller transmission, the presence of the rolling zone in the strip deformation zone leaded to different stresses in the upper and lower surface of the strip, which caused the occurrence of C warp defects. This phenomenon was further verified by dynamic explicit finite element analysis. The process parameters were compared and analyzed, and the Design of Experiment (DOE) was carried out to further optimize the process parameters, and the mean value of the warping defect was reduced from 27.6 to 10.5 mm.
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2020, Vol. 30 
