US 6,598,662 B2 · Molten steel supplying apparatus for continuous casting and continuous casting method therewith

Abstract

An apparatus for supplying molten steel and a continuous casting method therewith are described. The apparatus is equipped with a tundish 1 having an upper nozzle 2 at the bottom, a flow control mechanism 3 disposed below the upper nozzle 2, an immersion nozzle 4 formed by a refractory material having a good electrical conductivity, one electrode 5 disposed in the inner space of the tundish 1, the other electrode 6 disposed in the immersion nozzle 4, and a power supply 7 connected to the electrodes 5 and 6. In the method, the molten steel is supplied into a mold in the state of supplying an electric current between the inner surface of the immersion nozzle 4 and the molten steel 8 passing through the inside thereof by utilizing the apparatus for supplying molten steel. The deposition of the Al oxide or the like in the molten steel onto the inner surface of the immersion nozzle and others can be prevented, and thereby the generation of the surface defects in the products can also be prevented.

Claims16

Dependent claims

An apparatus for supplying molten steel used for the continuous casting, compromising:

a tundish for storing the molten steel,
an upper nozzle disposed in the bottom of the tundish,
a flow control mechanism for controlling the flow rate of the molten steel from the tundish into a mold,
an immersion nozzle for supplying the molten steel into the mold, and
a pair of electrodes and a power supply connected thereto,
wherein an inner surface, being in contact with the molten steel, of one of the upper nozzle, the flow control mechanism and the immersion nozzle is formed by a refractory material having an electrical conductivity not less than 1×103 S/m at a temperature not less than the melting point of steel,
wherein the one electrode of the paired electrodes is disposed in one of a tundish wall, the upper nozzle, the flow control mechanism and the immersion nozzle in such a way that the one electrode is in contact with the molten steel,
wherein the other electrode is disposed in a part formed by the refractory material having the electrical conductivity not less than 1×103 S/m at a temperature not less the melting point of steel.

5 more elements

A continuous casting method, comprising:

a) using an apparatus for supplying molten steel used for the continuous casting, wherein the apparatus comprises
a tundish for storing the molten steel,
an upper nozzle disposed in the bottom of the tundish,
a flow control mechanism for controlling the flow rate of the molten steel from the tundish into a mold, and
an immersion nozzle for supplying the molten steel into a mold, and
a pair of electrodes and a power supply connected thereto,
wherein an inner surface, being in contact with the molten steel, of one of the upper nozzle, the flow control mechanism and the immersion nozzle is formed by a refractory material having an electrical conductivity not less than 1×103 S/m at a temperature not less than the melting point of steel,
wherein the one electrode of the paired electrodes is disposed in one of a tundish wall, the upper nozzle, the flow control mechanism and the immersion nozzle in such a way that the one electrode is in contact with the molten steel,
wherein the other electrode is disposed in a part formed by the refractory material having the electrical conductivity not less than 1×103 S/m at a temperature not less than the melting point of steel,
b) supplying a molten steel stored in a tundish into a mold, and
c) supplying an electric current between the inner surface of the upper nozzle, the flow control mechanism and the immersion nozzle in which the other electrode of the paired electrodes is disposed and the molten steel.

8 more elements

Dependencies are inferred from the claim text.

Molten steel supplying apparatus for continuous casting and continuous casting method therewith

Life of this patent

Molten steel supplying apparatus for continuous casting and continuous casting method therewith

Life of this patent

Abstract

Claims16