Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2003-02-28
2009-06-02
Kerns, Kevin P (Department: 1793)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S468000, C164S502000, C164S504000
Reexamination Certificate
active
07540317
ABSTRACT:
When a molten steel flow velocity (u) on a bath surface is higher than a mold-powder entrainment critical flow velocity of 0.32 m/sec, the molten steel flow velocity (u) is controlled to a predetermined molten steel flow velocity by applying a shifting magnetic field to impart a braking force to a discharge flow from an immersion nozzle. When the molten steel flow velocity (u) is lower than an inclusion-adherence critical flow velocity of 0.20 m/sec and is higher than or equal to a bath-surface skinning critical flow velocity of 0.10 m/sec, the molten steel flow velocity (u) is controlled to the range of 0.20-0.32 m/sec by applying a shifting magnetic field to rotate the intra-mold molten steel in a horizontal direction. When the molten steel flow velocity (u) is lower than the inclusion-adherence critical flow velocity, the molten steel flow velocity (u) is controlled to the range of 0.20-0.32 m/sec by applying a shifting magnetic field to impart an accelerating force to the discharge flow from the immersion nozzle.
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Kondo Tsuneo
Kubota Jun
Mizuoka Seishi
Frishauf Holtz Goodman & Chick P.C.
JFE Steel Corporation
Kerns Kevin P
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