Research on the effect of U-shaped cooling in hot rolling on the structure and properties of strip steel
410LA is a widely used automotive structural component.During the initial production of 410LA,there was a significant difference in performance between the head,middle,and tail.The mechanical properties of the steel coil were unevenly distributed along the length direction,and there was a large deviation in strength between the head and tail.The intermediate strength was relatively stable.Through comprehensive research and analysis,it was found that the different effects of dislocation strengthening,fine-grained strengthening,and precipitation strengthening at the head,middle,and tail have led to significant differences in strengthening at different parts of the steel coil.This article focuses on the development and application of the hot rolled U-shaped coiling process to a-chieve differentiated control of the coiling temperature of strip steel.The experimental results show that the com-pensation of 50～100 ℃ for the temperature of the 50 meter coil at the head and tail of the hot-rolled strip reduces the performance difference between the head,middle,and tail,and significantly improves the uniformity of the steel coil performance.The yield strength fluctuation value is reduced from 120 MPa to 30 MPa,and the tensile strength fluctuation value is reduced from 70 MPa to 20 MPa.The use of hot-rolled U-shaped cooling technology also solves the problems of large fluctuations in acid rolling thickness and poor head and tail plate shape caused by large fluctua-tions in the strength of the head and tail of 410LA,improving the stability of the cold rolling process production and use.
U-shaped coolingcoiling temperature410LAmicrostructure and properties
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