Study and Application of Advanced Secondary Control Model for Continuous Casting at Baosteel

A dynamic secondary cooling control model was developed to improve the quality of slab casting by combining the thermal transition computation method and proportional integral derivative (PID) controlling technology in continuous casting. The calculation principles, characteristics, and controlling parameters of the dynamic secondary cooling control model are described. The model automatically adjusts the secondary cooling flow according to slab casting parameters and maintains the slab surface temperature close to the target value. The reliability and usefulness of the secondary cooling control system are improved by quickly adjusting and stabilizing the secondary cooling flow. Online monitoring of temperature shows that the model is precise, and the surface cracks and central segregation were found to improve in the slabs. The model has been successfully applied to several continuous casters at Baosteel.