JPH059752U - Ladle nozzle - Google Patents

Abstract

(57) [Abstract] [Purpose] In the ladle nozzle installed at the bottom of the ladle used when pouring molten steel into the tundish while preventing its oxidation by the seal box method, the molten steel from the ladle is used. It is possible to prevent the flow from scattering to the inner peripheral wall of the seal box and the molten steel flow guide pipe arranged in the tundish, and reduce the amount of metal that adheres to the inner peripheral wall of the seal box and the molten steel flow guide pipe. Get the ladle nozzle. [Structure] It is assumed that a ladle nozzle 13 has therein a plurality of molten steel flow paths 13a, 13b, 13c along the longitudinal direction. As a result, when the molten steel flow passes through the ladle nozzle 13, the molten steel flow is divided into a plurality of flows in the nozzle, so that the momentum is weakened and further rectified as compared with the case where one molten steel flow path is formed. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a ladle nozzle provided in a ladle used for pouring molten steel into a tundish while preventing its oxidation by a seal box method during continuous casting of steel, and more specifically, a molten steel flow from the ladle. Of the seal box and the molten steel flow guide pipe for guiding the molten steel flow inside the tundish to guide the molten steel flow to the inside of the tundish. The present invention relates to a ladle nozzle designed to reduce the amount of metal attached.

[0002]

[Prior Art]

 As is well known, various measures have been taken between the ladle and the mold in continuous casting of steel to prevent the oxidation of the molten steel flow and to prevent the formation of inclusions and pinholes. Among them, between the ladle in which the molten steel to be continuously cast is stored and the tundish that stabilizes the molten steel flow from this ladle and distributes it to each strand, etc., a seal box method or a long nozzle method is used. This prevents the molten steel flow injected from the ladle into the tundish from oxidizing.

FIG. 4 is a view for explaining a state in which molten steel is injected into a tundish from a conventional ladle provided with a ladle nozzle while preventing its oxidation by a seal box method. Reference numeral 1 is a tundish, 2 is a ladle arranged above the tundish 1, and a ladle nozzle for pouring molten steel in the ladle into the tundish 1 is provided at the bottom of the ladle 2. 3 are provided.

The tundish 1 is provided with a weir 1a for controlling the flow of the injected molten steel to promote floating separation of inclusions, while the tundish lid 1b is provided with a ladle nozzle 3 inside. A cylindrical molten steel flow guide tube 1c is provided for guiding the molten steel flow passing through the inside of the tundish 1.

Between the upper edge of the molten steel flow guide tube 1c and the outer bottom surface of the ladle 2, as shown in the figure, a cylindrical shape having a longer longitudinal dimension than that of the ladle nozzle 3 is formed. The seal box 4 is provided so as to surround the ladle nozzle 3, and the space formed by the inner peripheral wall of the seal box 4 and the molten steel flow guide pipe 1c through the gas supply pipe 4a arranged in the seal box 4. By supplying argon gas to the tank, the molten steel flow injected into the tundish 1 from the ladle 2 through the ladle nozzle 3 is prevented from being oxidized. In addition, 5 is a flux for covering the molten steel in the tundish 1.

In this case, as the ladle nozzle 3 arranged at the bottom of the ladle 2, as shown in FIG. 5 which is a sectional view taken along the line A-A of FIG. A cylindrical shape with 3a formed is used.

[0007]

[Problems to be solved by the device]

 However, in the conventional ladle nozzle 3 arranged at the bottom of the ladle 2 used when pouring molten steel into the tundish while preventing its oxidation by the seal box method, the inside of the ladle nozzle 3 extends in the longitudinal direction. Since one molten steel flow path 3a is formed, the molten steel flow is not diverted when passing through the ladle nozzle 3, and the momentum is strong, so that the molten steel flow that has passed through the ladle nozzle 3 is sealed box 4 And a considerable amount of metal scattered on the inner peripheral wall of the molten steel flow guide pipe 1c arranged on the lid 1b of the tundish. To do. Therefore, there is a problem that it takes a lot of time and labor to remove the metal adhered to the seal box 4 and the molten steel flow guide pipe 1c.

The present invention has been made to solve the above-mentioned problems, and it is provided at the bottom of a ladle used when pouring molten steel into a tundish while preventing its oxidation by a seal box method. In the ladle nozzle to be installed, the molten steel flow from the ladle is prevented from scattering to the inner peripheral wall of the seal box and the molten steel flow guide pipe arranged in the tundish, and these seal box and molten steel flow are prevented. It is an object of the present invention to provide a ladle nozzle capable of reducing the amount of metal adhered to the inner peripheral wall of the guide tube.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the ladle nozzle according to the present invention is a ladle arranged at the bottom of a ladle used when pouring molten steel into a tundish while preventing its oxidation by a seal box method. The nozzle is characterized in that a plurality of molten steel flow paths are formed inside along the longitudinal direction.

[0010]

[Action]

 When the molten steel flow passes through the ladle nozzle, the molten steel flow is divided into a plurality of streams in the ladle nozzle, so that the momentum is weakened and rectified as compared with the case where one molten steel flow path is formed. As a result, the molten steel flow passing through the ladle nozzle is less likely to be scattered on the inner peripheral wall of the seal box and the molten steel flow guide pipe.

[0011]

【Example】

 The present invention will be described below based on embodiments. FIG. 1 is a diagram for explaining a state in which molten steel is poured into a tundish from a ladle provided with a ladle nozzle according to the present invention by a seal box method while preventing its oxidation, and FIG. 2 is shown in FIG. FIG. 3 is a cross-sectional view taken along line BB of the ladle nozzle according to the embodiment of the present invention. In FIG. 1, the same components as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, 13 is a ladle nozzle arranged at the bottom of a ladle 12 used when pouring molten steel into the tundish 1 while preventing its oxidation by a seal box method. . As shown in FIG. 2, the ladle nozzle 13 has therein three molten steel passages 13a, 13b, 13c each having a fan-shaped cross section and extending in the longitudinal direction.

Therefore, when the molten steel flow passes through the ladle nozzle 13, the molten steel flow is divided into three in the ladle nozzle 13, so that the momentum of the molten steel flow is higher than that of the conventional ladle nozzle in which one molten steel flow path is formed. Is weakened and more rectified. As a result, the molten steel flow passing through the ladle nozzle 13 is less likely to be scattered on the inner peripheral walls of the seal box 4 and the molten steel flow guide pipe 1c, and the inner peripheral wall of the seal box 4 and the molten steel flow guide pipe 1c is reduced. It is possible to reduce the amount of metal that adheres. As a result, the labor and time required to remove the metal adhered to the inner wall of the seal box 4 and the molten steel flow guide tube 1c can be greatly reduced.

FIG. 3 is a sectional view of a ladle nozzle according to another embodiment of the present invention. As shown in the figure, the ladle nozzle 23 has two molten steel passages 23a and 23b formed in the inside thereof along the longitudinal direction. Therefore, similarly to the above, the molten steel flow passing through the ladle nozzle 23 is less likely to be scattered to the inner peripheral wall of the seal box 4 and the molten steel flow guide pipe 1c, and these seal box 4 and the molten steel flow guide pipe are less likely to be scattered. It is possible to reduce the amount of metal adhered to the inner peripheral wall of 1c, and as a result, the labor and time required for the work of removing the metal adhered to the inner peripheral wall of the seal box 4 and the molten steel flow guide pipe 1c are significantly reduced.

[0015]

[Effect of the device]

 As described above, according to the ladle nozzle according to the present invention, since a plurality of molten steel flow paths are formed in the longitudinal direction, the molten steel is sealed by the seal box method so that the tundish can be prevented. By arranging this ladle nozzle at the bottom of the ladle used for pouring into the inside, the molten steel flow is divided into multiple parts inside the ladle nozzle when passing through this ladle nozzle. As compared with the conventional ladle nozzle in which one molten steel flow path is formed, its momentum is weakened and it is more rectified. Therefore, the molten steel flow that has passed through the ladle nozzle is less likely to be scattered to the inner peripheral wall of the seal box and the molten steel flow guide pipe arranged in the tundish. The labor and time required to remove the metal adhered to the inner wall of the flow guide tube can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a view for explaining how molten steel is poured from a ladle provided with a ladle nozzle according to the present invention into a tundish by a seal box method while preventing its oxidation.

FIG. 2 is a sectional view of the ladle nozzle according to the embodiment of the present invention shown in FIG. 1 taken along line BB.

FIG. 3 is a sectional view of a ladle nozzle according to another embodiment of the present invention.

FIG. 4 is a view for explaining how molten steel is poured into a tundish from a conventional ladle provided with a ladle nozzle while preventing its oxidation by a seal box method.

FIG. 5 is a cross-sectional view of the conventional ladle nozzle taken along the line AA.

[Explanation of symbols]

1 ... Tundish 1a ... Weir 1b ... Tundish lid
1c… Molten steel flow guide tube 2, 12… Ladle 3, 13, 23… Ladle nozzle 3a, 13a, 13
b, 13c, 23a, 23b ... Molten steel flow path 4 ... Seal box
4a ... Gas supply pipe

Claims (1)

[Claims for utility model registration] [Claim 1] In a ladle nozzle arranged at the bottom of a ladle used when pouring molten steel into a tundish while preventing its oxidation by a seal box method, A ladle nozzle, characterized in that a plurality of molten steel flow paths are formed along the longitudinal direction of the ladle.