INVESTIGATION ON MOULD HEAT TRANSFER IN CONTINUOUS CASTING OF ROUND BILLET

摘要

On the basis of measured temperature, the heat flux field was calculated by means of the inverse heat conduction model. The calculated distribution of longitudinal and circumferential heat flux, as well as solidified shell thickness, indicated that both heat transfer and solidification were non-uniform in round billet mould. The formula for calculating shell thickness at the mould outlet, which was as a function of height-averaged heat flux and casting speeds, was obtained by fitting the results of heat flux and shell thickness with inverse heat conduction model. The relationship of calculated circumferential heat flux and shell thickness at different mould heights was also analyzed in detail taking into account various casting speeds and different mould installations. Both the fields of heat flux and shell thickness can reflect the non-uniform characteristics of heat transfer in round billet mould, which could provide a valuable tool for predicting heat flux and strand shell thickness and optimizing round billet quality in the continuous casting process.