Research on the influence of uneven cooling after rolling on plate shape
At present,the 2050 hot rolling line of Tangshan Iron and Steel Company has encountered plate shape problems such as curling and double-sided waves at the head of the strip during the production of thin specification dual phase steel substrates,which affects subsequent production.Due to the high qualification rate of the exit plate shape of the rolling mill,the research focus will be on post rolling cooling.By comparing the transverse tempera-tures of FDT and CT strips,the influence of laminar cooling has been basically eliminated.A finite element model was established using ABAQUS software to simulate the variation of residual stress in the temperature field,phase transformation field,and stress field coupling process of strip steel in the coiling area.The accuracy of the model was verified through microstructure analysis,and the mechanism of residual stress caused by uneven phase transfor-mation of strip steel under the interference of coiling cooling water was attempted to analyze.And a process plan was proposed to optimize the traditional spray timing of coiling cooling water,which reduced some residual stresses and improved the distribution uniformity of residual stresses.This significantly reduced the degree of strip head ben-ding and double-sided waves,and improved the downstream coldrolling production efficiency and yield.
ladle bendingtake-upcooling after rollingphase transformationfinite element
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