Optimization Of Heating Technology For Continuous Casting Billet Of Heavy Rail Steel

In order to solve the problem that the depth of the decarburization layer of the heavy rails goes beyond the specification and improve the percent of pass, taking U75V steel as an example,combining the production of heavy rail steel in heavy section plant of Wuhan Iron and Steel Corporation, the effect of heating temperature and heating time on decarburization depth of rails have been analyzed by observing the changes in the slab's decarburization layer depth during the course of heating.The relationship between the slab's decarburization depth and heating temperature,heating time have been proposed through regression analysis of the experiments'results by heating experiments.The difference of decarburization between slab before and after reheating and heavy rail steel finished product have been contrasted by using pictures.Besides,slab's mathematical model of heat transfer in the reheating course has been set up by analysis of slab's reheating conditions in reheating furnace.The transient temperature field on slab's section has been simulated numerically by FEM,the temperature distribution of slabs in reheating furnace and the transient temperature field on its section has been calculated then. Heating technology of heavy rail steel has been established by analyzing the experimental conclusions and the process of heating the billet cross-section of temperature field simulation results.