Patent · US Active

Method and apparatus for controlling the flow of molten steel in a mould

US7975753B2 · kind B2 · utility

2Cited by

1References

18Claims

0Family size

Assignee

ABB AB · SE

Inventors

Anders Lehman · Bromma, SE
Helmut Hackl · Munich, DE
Jan-Erik Eriksson · Visby, SE
Olof Sjödén · Nyköping, SE

Key dates

Filing date	Jan 6, 2009
Grant date	Jul 12, 2011
Priority date	—
Expiry date	Jul 19, 2029

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB22D11/115
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

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. Controlling a molten steel flow velocity on a molten steel bath surface to a predetermined molten steel flow velocity by 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 a mould powder entrainment critical flow velocity. Controlling the molten steel flow velocity on the meniscus to a range of from an inclusion adherence critical flow velocity or more to a mould powder entrainment critical flow velocity or less by applying a shifting magnetic field to increase the molten steel flow when the molten steel flow velocity on the meniscus is lower than the inclusion-adherence critical flow velocity.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.