TEMPERATURE ESTIMATION METHOD FOR CAST PIECE

PROBLEM TO BE SOLVED: To provide a temperature estimation method for a cast metal in which longer-direction temperature difference of the cast metal and recuperation of the surface of the cast metal are taken into account.SOLUTION: There is provided the temperature estimation method for a cast metal, for deriving a temperature of a cast metal 10 charged into a heating furnace 14 after being cast by a continuous casting, cut into a predetermined dimension, and housed in a thermal insulation cover 13. The temperature estimation method comprises the steps of: obtaining a three-dimensional computational model in which a plurality of calculation grids in a longer direction, a width direction, and a thickness direction on the cast metal 10 are arranged; calculating temperature of each calculation grid based on operation result of the continuous casting; correcting the temperature of each calculation grid based on a correction value obtained by multiplying a temperature difference between a temperature measurement value at a measurement part of the surface of the cast metal 10 when the cast metal 10 is moved to the heating furnace 14 and the temperature of the calculation grid by an adjustment value; obtaining a temperature change of each calculation grid with respect to the cast metal 10 traveling within the heating furnace 14; and estimating a temperature distribution of the whole cast metal 10 when being extracted from the heating furnace 14. The adjustment value becomes large according to the length of time period when the measurement part is housed in the thermal insulation cover 13, and the adjustment value is a value more than 0 and less than 1.