Patent ID: 7975753

Claim:
A method for controlling a flow of molten steel in a mould by applying at least one magnetic field to the molten steel in a continuous slab casting machine, the method comprising the steps of: determining a molten steel flow velocity on the meniscus of the molten steel in the mould; determining whether the determined molten steel flow velocity is higher than a mould powder entrainment critical flow velocity; determining whether the molten steel flow velocity is lower than an inclusion adherence critical flow velocity by comparing the determined molten steel flow velocity with the mould powder entrainment critical flow velocity and the inclusion adherence critical flow velocity; applying a static magnetic field to impart a stabilizing and braking force to a discharge flow from an immersion nozzle when the molten steel flow velocity on the meniscus is higher than the mould powder entrainment critical flow velocity; and applying a shifting magnetic field to the flow from the immersion nozzle to increase the molten steel flow when the molten steel flow velocity on the meniscus is lower than the inclusion adherence critical flow velocity, so that the flow velocity on the meniscus is controlled to a range between the inclusion adherence critical flow velocity and the mould powder entrainment critical flow velocity.