Theoretical prediction and experimental verification of hardened layer depth of Cr3 steel backup roll for heavy plate mill
Differential heat treatment is a key process that determines the microstructure,stress distribution and service performance of the backup roll working layer.In order to accurately control the hardened layer depth on the backup roll body of Cr3 steel used in the heavy plate mill and further improve its service performance within its life cycle,the temperature field distribution of the backup roll during differential heat treatment was calculated using ABAQUS finite element simulation software.The temperature and microstructure evolution at different depths from the backup roll surface were analyzed,and the hardened layer depth on the backup roll body during differential heat treatment was predicted.The results show that when the heating temperature reaches 840 ℃ or above,Cr3 steel can obtain non-pearlite structure with better wear resistance.The hardened layer depth of the Cr3 steel backup roll experimental piece reaches 110 mm,the surface hardness reaches 55 HSD or above,and the hardness reduction at the depth of 110 mm from the surface is not greater than 4 HSD.The theoretical prediction results of the hardened layer depth are in good agreement with the measured results,which can achieve precise control of the hardened layer depth of the backup roll and guide the formulation of the differential heat treatment process for the Cr3 steel backup roll.
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