Abstract: Heat transfer and distortion of mould plates have a great impact on surface defects and cracks. Based on the measured data of online monitoring system for wide and thick continuous casting mould, the inverse mathematical model for mould heat transfer is built, in which the distribution of heat flux and temperature of mould plates is calculated from the measured temperatures. Through applying the inverse simulation results on the thermo-elastic-plastic model, the thermal behavior and distortion of mould plates are further investigated. The results indicate the distribution of mould temperature takes on a notably non-uniform characteristic and has an inherited tendency along the casting direction. Maximal distortion appears at the center area in wide faces, and decreases gradually towards slab corners. Along the width direction, plate distortion has the same trend with the profiles and fluctuations of mould temperatures. The analysis methods through combination of online measurement data with numerical simulation can reflect the non-uniform characteristics of mould process, and provide reliable basis for prediction of surface defects and process optimization.

Key words: distortion, heat transfer, mould, non-uniformity, wide and thick slab