JPH05104212A - Tundish with molten steel heating device - Google Patents

Abstract

PURPOSE:To scarcely remain molten metal in a molten metal receiving side sectional chamber by demarcating a runner with a sleeve brick being possible to repair or exchange at the time of eroding or breaking and enabling smooth flowing of the molten metal in the runner. CONSTITUTION:The inner part of a tundish 10 is divided into the molten metal receiving side sectional chamber 3 and a molten metal discharging side sectional chamber 4 by a weir 2 arranged at the center part. The weir 2 is provided with the runner 7 for communicating the molten metal receiving side sectional chamber 3 with the molten metal discharging side sectional chamber 4 and a molten metal heating device for heating the molten metal passed through this runner 7. The runner 7 is demarcated with a sleeve brick 9 and inclined downward from the molten metal receiving side sectional chamber 3 toward the molten metal discharging side sectional chamber 4. In the molten metal receiving side sectional chamber 3, a step difference between the bottom surface of the runner 7 and the bottom surface thereof 3 is substantially the same as the thickness of the sleeve brick 9. In the molten metal discharging side sectional chamber 4, a step difference between the bottom surface of the runner 7 and the bottom surface thereof 4 is in the same thickness of the sleeve brick or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tundish with a molten steel heating device used in a continuous steel casting machine.

Recently, in the field of continuous casting of steel, a tundish with a molten steel heating device capable of controlling the heating temperature of molten steel has come to be used for the purpose of adjusting the steel quality of the continuously cast slab or convenience in operation. Came.

As a heating system of the molten steel heating device, there are an induction heating system, a plasma heating system and the like. Further, regarding the installation place of the molten steel heating device, a method of installing it on a weir provided in the central part of the tundish, a tundish side part There is a method of providing it in the molten steel flow path provided in.

The present invention relates to a tundish of the type in which a molten steel heating device is provided on the weir in the central part of the tundish.

[0005]

2. Description of the Related Art An example of a conventional tundish of this type is shown in FIG. The tundish 1 is divided into a hot water receiving side compartment 3 and a hot water outlet side compartment 4 by a weir 2 made of a refractory provided in the central portion. The molten steel heating device includes a primary coil 5 and an iron core 6 that extends annularly through the coil 5, and the coil 5 and a part of the iron core 6 are built in the weir 2. The weir 2 is provided with a runner 7 as a molten steel passage, and the hot-water receiving side compartment 3 and the tapping-side compartment 4 are the runners 7.
Are in communication with each other. The molten steel supplied to the hot water receiving side compartment 3 passes through the runner 7 and enters the hot water outlet side compartment 4,
It is heated by receiving induction heating by the coil 5 and the iron core 6. The molten steel in the tapping side compartment 4 is discharged from the nozzle 8.

The tundish with a molten steel heating device shown in FIG. 3 is formed by providing a weir 2 on a normal tundish. Therefore, the bottom surfaces of the hot water receiving side compartment 3 and the hot water outlet side compartment 4 are the same. In addition, the receiving room 3
The bottom surface of the runner 7 is also a horizontal surface having the same height as the bottom surfaces of the receiving-side compartment 3 and the tapping-side compartment 4 so that no molten steel is left inside. As a result, it is difficult for the hot water to flow smoothly from the hot water receiving side compartment 3 to the hot water outlet side compartment 4. Also,
There is no room for the use of sleeve bricks to define the runner 7, as the runner 7 must be at the lowest position as shown in FIG. Therefore, it is difficult to repair the weir 2 when the periphery of the runner 7 is melted or damaged, and the life of the weir 2 is significantly shortened.

FIG. 4 shows a weir portion of another conventional tundish with a molten steel apparatus. This tundish differs from the tundish shown in FIG. 3 in that the runner 7 is provided at a relatively high position with respect to the bottom surfaces of the hot water receiving side compartment 3 and the hot water outlet side compartment 4.
The point is that the runner 7 can be defined by the sleeve brick 9. Therefore, in the case of melting loss or damage, repair can be easily performed by replacing the sleeve brick 9, and the life of the weir 2 can be kept long. However, in the tundish of FIG. 4, since the runner 7 is provided at a high position, there is a drawback that a large amount of hot water remains in the hot water receiving side compartment 3. Further, also in this tundish, since the runners 7 are formed horizontally, the drawback that the hot water does not flow smoothly remains.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to define a runner in a tundish with a molten steel heating device by a sleeve brick that can be repaired or replaced when melted or damaged, and the inside of the runner is filled with hot water. To allow the water to flow smoothly, and to leave little hot water in the compartment on the receiving side.

[0009]

In order to solve the above problems, according to the present invention, there is provided a tundish in which the inside is divided into a hot water receiving side compartment and a hot water outlet side compartment by a weir provided at the center. And the weir is provided with a molten steel heating device for communicating the hot water receiving side compartment and the tapping side partitioned chamber, and a molten steel heating device for heating the molten steel passing through the runner. In the tundish, the runner is defined by a sleeve brick and is inclined downward from the receiving-side compartment to the tapping-side compartment. The step between the bottom of the side compartment and the bottom of the runner is substantially equal to the thickness of the sleeve brick, and the step between the bottom of the runner and the bottom of the tap side is equal to or greater than the thickness of the sleeve brick. The tundish with the molten steel heating device is characterized by It is subjected.

[0010]

The molten steel supplied to the hot water receiving side compartment of the tundish with the molten steel heating device according to the present invention smoothly flows into the hot water outlet side compartment through the inclined runway. When the molten steel passes through the runner, the temperature of the molten steel is controlled by heating by a molten steel heating device provided in the weir.

Since the runner is defined by the sleeve brick, it can be easily repaired by replacing the sleeve brick when it is melted or damaged.

Further, in the hot water receiving side compartment and the hot water outgoing side compartment, since there is a step between the bottom surface of each of the compartments and the bottom surface of the runner at least equal to or greater than the thickness of the sleeve brick, the sleeve brick It is not necessary to sharply cut the bottom of the tundish when repairing or replacing the.

Further, in the hot water receiving side compartment, the level difference between the bottom of the runner and the hot water receiving side compartment is substantially the same as the thickness of the sleeve brick, so the liquid level of the molten steel remaining in the hot water receiving side compartment is It is extremely low, that is, the amount of remaining hot water is very small.

It should be noted here that simply inclining the runner of the conventional steel tundish with molten steel heating apparatus as shown in FIG. 4 will make the flow of molten steel smooth in the runner. That is, since a large amount of hot water remains in the hot water receiving side compartment, the problem of the present invention cannot be completely solved. Even if the runner of the tundish shown in FIG. 4 is inclined and the position of the runner is lowered as low as possible. Minimize the amount of molten steel remaining in the compartment on the receiving side under the condition that the sleeve bricks that define the runner are in a position where they can be repaired or replaced and the hot water flows smoothly through the runner. Therefore, it is necessary to form the step relationship as in the present invention so that there is a difference between the height of the bottom surface of the receiving-side compartment and the height of the bottom surface of the tapping-side compartment.

[0015]

1 and 2 are a horizontal sectional view and a vertical sectional view, respectively, of an embodiment of a tundish with a molten steel heating device according to the present invention. The tundish 10 is internally provided with a hot water side compartment 3 by a weir 2 made of refractory material provided in the central portion.
It is divided into the hot water outlet side compartment 4 and the hot water outlet side compartment 4
A nozzle 8 for discharging molten steel is provided at the bottom of the. Further, the molten steel heating device includes a primary coil 5 and an iron core 6 extending annularly through the coil 5, and the coil 5 and the iron core 6 are provided.
Is part of the weir 2. Further, a runway 7 provided as a molten steel passage in the weir 2 to connect the hot water receiving side compartment 3 and the hot water outlet side compartment 4 is defined by a sleeve brick 9. These points are the same as in the conventional tundish shown in FIG.

Horizontally installed tundish 1 of FIG.
Unlike the runner of FIG. 1, the runner 7 in the tundish 10 according to the present invention shown in FIG. 1 and FIG.
Is inclined downward from the hot water outlet side compartment 4. Therefore, the molten steel can smoothly flow in the runner 7. Since the molten steel flows smoothly, the temperature of the molten steel can be controlled smoothly by the temperature heating device, and the inclusions can be floated smoothly.

The level difference between the bottom surface of the runner 7 and the bottom surface of the hot water receiving side compartment 3 in the hot water receiving side compartment 3 is substantially the same as the thickness of the sleeve brick 9.

In order not to leave any molten steel in the hot water receiving side compartment 3, it is not necessary to provide a step between the bottom surface of the runner 7 and the hot water receiving side compartment 3. However, in doing so, the sleeve bricks 9 will cause the tundish 10 to
It will be buried in the bottom of the. Then, when the sleeve brick 9 is melted or damaged and needs to be repaired or replaced, the bottom of the tundish 10 must be largely shaved. As in the embodiment of FIGS. 1 and 2, if the step difference between the bottom surface of the runner 7 and the bottom surface of the receiving-side compartment 3 is substantially the same as the thickness of the sleeve brick 9, the tundish 1
It is possible to avoid the inconvenience of shaving the bottom portion of 0 to a large extent, and to leave the minimum amount of molten steel in the hot water receiving side compartment 3.

On the other hand, in the tapping-side compartment 4, the step difference between the bottom surface of the runner 7 and the bottom surface of the tapping-side compartment 4 is equal to or larger than the thickness of the sleeve brick 9. Sleeve brick 9 as described above
For the sake of convenience in the repair or replacement work, the step needs to be at least the thickness of the sleeve brick 9 and is sufficient. However, since it is not necessary to consider the residual hot water in the hot water outlet side compartment 4, FIG.
It is possible to make the step larger than the thickness of the sleeve brick 9 as in the embodiment of FIG.

The inclination angle of the runner 7 is, for example, 3 degrees to 3 degrees.
Although it can be set to about 0 degree, it is possible to select an angle in another range depending on conditions such as the size and shape of the runner 7.

The material of the sleeve brick 9 is preferably alumina-carbonaceous material, zirconia-carbonaceous material, magnesia-carbonaceous material, etc. used for nozzles, but is not limited thereto. However, good spalling resistance is required.

[0022]

According to the tundish with the molten steel heating device of the present invention, the sleeve brick defining the runner can be easily repaired or replaced when it is melted or damaged, and
Hot water can be smoothly flowed into the runway, and almost no hot water is left in the compartment on the receiving side.

[Brief description of drawings]

1 is a cross-sectional view of a tundish with a molten steel heating device according to an embodiment of the present invention, which corresponds to the − cross-sectional view in FIG.

2 is a cross-sectional view in FIG.

FIG. 3 is a view showing an example of a conventional tundish with a molten steel heating device, in which (a) is a cross-sectional view and corresponds to (a) in (b), and (b) corresponds to (a).
FIG.

FIG. 4 is a fragmentary vertical cross-sectional view showing a section of a weir of another conventional tundish with a molten steel heating device in a section of a runner.

[Explanation of symbols]

1 tundish, 2 weirs, 3 hot water compartment,
4 Hot water side compartment, 5 coils, 6 iron cores, 7 runners, 8 nozzles, 9 sleeve bricks, 10 tundish.

(72) Inventor Aiaki Shiraishi, 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Steel Works (72) Inventor, Toru Shumiya, 1850, Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Inside the Steel Works (72) Inventor Masanori Yanuki 2-7-1, Nakajima, Hamamatsu City, Shizuoka Prefecture Sumikura Industrial Co., Ltd.

Claims (1)

[Claims] 1. A tundish in which the inside is divided into a hot water receiving side compartment and a hot water outlet side compartment by a weir provided at the center, wherein the weir is the hot water receiving side compartment and the hot water outlet side compartment. In a tundish with a molten steel heating device, which comprises a runner for communicating with and a molten steel heating device for heating the molten steel passing through the runner, the runner is defined by a sleeve brick, and It is inclined downward from the receiving-side compartment to the outlet-side compartment, and in the receiving-side compartment, the step between the bottom of the runner and the bottom of the receiving-side compartment is substantially the same as the thickness of the sleeve brick. And the step difference between the bottom surface of the runner and the bottom surface of the tapping side compartment is equal to or more than the thickness of the sleeve brick in the tapping side compartment.