Automatic Casting Method of Twin Belt Type Thin Slab Caster

Abstract

For the stabilization of operation and improvement of quality in twin belt type continuous casting process adopting overflow type pouring method, an automatic casting start method and a pool level control method have been developed on the following procedure.
(1) In the casting start stage, the flow rate of molten steel poured from large tundish into small tundish is estimated based on the measured change of small tundish weight. Required opening degree of sliding gate, casting speed and change timing of casting speed are calculated by using the above mentioned molten steel flow rate. Casting start is operated automatically by this method.
(2) After the automatic casting start, pool level in the caster is controlled by the change of casting speed, and at the same time the deviation of casting speed is reduced by the operation of opening degree of sliding gate of large tundish. Pool level control is operated automatically by this method.
The automatic casting method is being put into practice, and brings the smooth casting start and improvement of control accuracy of pool level.