The filling and solidification processes of a 25t steel ingot from a special steel plant were simulated by CAE software

and the numerical simulation results were compared with measured data from the practical production

and the feasibility of the model was verified.Solidification process of large steel ingot and the distribution of temperature field were analyzed.And the potential defects locations were forecast in the ingot.The results reveal that the larger riser size is helpful for the feeding

and macroshrinkage cavity is absent

however

shrinkage porosities along the axial can be observed.Through decreasing riser size and using stirring process in the subsequent process

central segregation can be eliminated to improve the quality of steel ingot.Based on the solidification time from simulation

the molddrawing time can be set 6.4 hours in advance after pouring steel ingot.