Method for controlling early casting stage in continuous...

B - Operations – Transporting – 22 – D

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B22D 11/08 (2006.01) B22D 11/16 (2006.01) B22D 11/18 (2006.01)

Patent

CA 1272366

METHOD FOR CONTROLLING EARLY CASTING STAGE IN CONTINUOUS CASTING PROCESS ABSTRACT OF THE DISCLOSURE A method for controlling an early stage casting in a continuous casting process comprising the steps of commencing to pour molten steel into a mold provided with a dummy bar head through an immersion nozzle provided with a flow rate control device, detecting that a steel level in the mold has reached a predetermined drawing commencement level and commencing drawing of the dummy bar head. A holding time for molten steel in the mold is predetermined, from the commencement of pouring molten steel into the mold to a commencement of the drawing of the dummy bar head, through a solidified shell formation velocity under prevailing operating conditions, and a prediction is made of whether or not, when the steel level has reached the predetermined level, a molten metal holding time substantially equal to the predetermined molten metal holding time can be obtained, and the flow rate of the molten steel is controlled in accordance with the result of the prediction.

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