JP3149613U - Molten steel storage container nozzle - Google Patents

Abstract

It is an object of the present invention to provide a nozzle for a molten steel storage container in which a member below a gas blowing member is less likely to be worn out and steel leakage from the bottom surface of the gas blowing member can be prevented. A nozzle for a molten steel storage container according to the present invention is a nozzle for a molten steel storage container that penetrates in a vertical direction, defines a molten steel passage hole through which molten steel passes, and is located at the bottom of a container that stores molten steel. A part of the molten steel passage hole 5 is formed, a gas blowing member 2 having a gas blowing passage hole for supplying gas to the molten steel passage hole 5, and a part of the molten steel passage hole 5 are formed. The gas blowing member lower portion 3 has a close contact portion 311 that is in close contact with the bottom surface 22 of the steel plate, and the diameter of the molten steel passage hole 5 is larger than the diameter of the gas blowing member 2. [Selection] Figure 1

Description

  The present invention relates to a nozzle for a molten steel storage container installed at a steel outlet at the bottom of a container in which molten steel is stored.

  The molten steel passage hole installed at the bottom of the container where molten metal such as molten steel is stored and through which high temperature molten steel passes, has excellent wear resistance, wear resistance, heat resistance, thermal shock resistance and hot strength. Use members. And there exists a steel outlet of the structure which prevents solidification by blowing gas into a molten steel passage hole and stirring the molten steel which retains in a molten steel passage hole.

  For example, as shown in FIG. 4, the gas blowing member 92 that blows gas into the molten steel passage hole 91 is provided in a part in the vertical direction of the steel outlet 13. The steel outlet 13 is constituted by an upper plate 93, a slide gate 14, and a lower nozzle 16 that extend downward in the vertical direction from an upper nozzle 94 inserted into the bottom 12 of the container 11 in which molten steel is stored. . The gas blowing member 92 is fitted into the upper plate 93, and the upper outer peripheral portion and the bottom surface of the gas blowing member 92 are bonded with mortar or the like. An air groove (not shown) is formed on the outer periphery that is not bonded, gas is supplied to the air groove, and gas is blown out from the gas blowing member 92.

  By the way, in the steel outlet 13, when the slide gate 14 slides, the molten steel passage hole 91 is blocked by the slide gate refractory plate 15, and gas is blown out from the gas blowing member 92 in a state where the steel outlet is stopped without communication. The molten steel staying in the molten steel passage hole 91 of the upper nozzle 94 and the upper plate 93 is agitated to prevent solidification. Moreover, when the immersion nozzle which is not shown in figure is attached to the lower part of the lower nozzle 16, and a continuous casting of molten steel is performed, a small amount of gas is blown out in the state where the molten steel passage hole 91 communicates, so that the immersion nozzle inner hole Precipitation and adhesion of alumina on the surface are prevented.

  However, when the molten steel comes into contact with an adhesive portion such as mortar with the momentum of the molten steel flowing through the molten steel passage hole 5 in the steel output state, the mortar is likely to be melted. When the mortar or the like is melted, there is a problem that the steel leaks or the molten steel reaches the outer peripheral side of the gas blowing member 92 and closes the air groove so that the gas cannot be blown out. If the predetermined gas is not blown out in the steel output stop state and the steel output state, problems such as adhesion of alumina to the immersion nozzle, closing of the molten steel passage hole 5, peeling of the alumina and entering the steel slab and causing defects occur. The worst operation will be stopped.

  The present invention has been made in view of the above problems, and solves the problem of providing a nozzle for a molten steel storage container that can prevent molten steel from flowing into a close contact portion between a gas blowing member and a lower portion of the gas blowing member and prevent the adhesive from being melted. It should be a challenge.

The structural feature of the device according to claim 1 for solving the above-mentioned problem is that a molten steel storage container is defined at a bottom portion of a container in which a molten steel passage hole through which molten steel penetrating in the vertical direction passes is stored. Nozzle for
Forming part of the molten steel passage hole, and a gas blowing member having a gas blowing passage hole for supplying gas to the molten steel passage hole;
Forming a part of the molten steel passage hole, having a close contact portion in close contact with the bottom surface of the gas blowing member, a gas blowing member lower portion having a diameter of the molten steel passage hole larger than the diameter of the gas blowing member;
It is characterized by having.

  In the invention according to claim 1, since the diameter of the molten steel passage hole below the gas blowing member forming a part of the molten steel passage hole is larger than the diameter of the gas blowing member forming a part of the molten steel passage hole, In the state, it is difficult for the molten steel to flow between the bottom portion of the gas blowing member and the close contact portion of the lower portion of the gas blowing member, and the wear of the adhesive can be prevented. Therefore, since it is possible to prevent the molten steel from entering the outer peripheral side of the gas blowing member, it is possible to prevent the air groove that supplies the gas blown out to the molten steel passage hole from being closed.

It is explanatory drawing which shows the structure of the nozzle 1 for molten steel storage containers of this Embodiment 1. FIG. (A) is a top view which shows the structure of the upper plate 3 of the nozzle 1 for molten steel storage containers of this Embodiment 1, (b) is the structure of the upper plate 3 of the nozzle 1 for molten steel storage containers of this Embodiment 1. FIG. It is a cross-sectional view shown. It is explanatory drawing which shows the structure of the steel outlet 13 using the nozzle 1 for molten steel storage containers of this Embodiment 1. FIG. It is explanatory drawing which shows the structure of the conventional steel outlet 13.

  A representative embodiment of the present invention will be described with reference to FIGS. The nozzle for a molten steel storage container according to this embodiment is used as a part of a steel outlet at the bottom of a container in which molten steel of molten metal is stored.

(Embodiment 1)
As shown in FIG. 1, the nozzle 1 for molten steel storage container according to the first embodiment includes a gas blowing member 2, an upper plate (lower gas blowing member) 3, and an upper nozzle 4, and in the vertical direction. A molten steel passage hole 5 through which the molten steel passes is formed.

  As shown in FIG. 1 and FIG. 2, the gas blowing member 2 is a substantially cylindrical member, and the central through hole 20 forms a part of the molten steel passage hole 5 of the nozzle 1 for the molten steel storage container. Etc. as the main component. The gas blowing member 2 has a gas blowing passage hole (not shown) through which gas can be blown from the outer peripheral side to the molten steel passage hole 5 on the inner peripheral side, and a vertical direction in close contact with a close contact portion 311 of the upper plate 3 described later. It has a lower bottom surface 22 and a groove-shaped air groove 23 having a part in the vertical direction recessed on the inner peripheral side on the outer peripheral surface. The gas blowing member 2 is preferably a porous body having continuous bubbles or a member having holes that penetrate radially, and the gas blowing passage holes are holes that penetrate continuously or radially. The gas blowing vent communicates between the air groove 23 of the gas blowing member 2 and the inner peripheral surface, and opens uniformly on the inner peripheral surface of the gas blowing member 2 in order to form a gas film evenly.

  The upper plate 3 has a ceramic (or refractory) main body 31 and a metal belt-like frame 32 that restrains the side surface of the main body 31, and the molten steel of the nozzle 1 for the molten steel storage container is provided at the center. A part of the passage hole 5 is formed, and the gas blowing member 2 has a through hole 30 into which the gas blowing member 2 is fitted downward from above. The upper plate 3 has a shape in which the periphery of the through-hole 30 slightly protrudes upward in the vertical direction, and the iron plate 33 is disposed on a flat portion on the upper side in the vertical direction that does not protrude. The main body 31 has a close contact portion 311 that is in close contact with the bottom surface 22 of the gas blowing member 2 fitted into the through hole 30 from above and an adhesive such as mortar 6. The through hole 30 is formed such that the diameter in the lower part in the vertical direction is narrower than the diameter of the part in which the gas blowing member 2 in the upper part in the vertical direction is held.

  As shown in FIG. 1, the upper nozzle 4 is positioned above the gas blowing member 2 and the upper plate 3 and is a substantially cylindrical member. The central through hole 40 forms part of the molten steel passage hole 5 of the nozzle 1 for the molten steel storage container. The upper nozzle 4 is made of ceramic (for example, alumina-graphite refractory).

  The molten steel passage hole 5 is formed by connecting the through hole 40 of the upper nozzle 4, the through hole 20 of the gas blowing member 2, and the through hole 30 of the upper plate 3. The molten steel passage hole 5 has substantially the same diameter of the through hole 40 of the upper nozzle 4 and the through hole 20 portion of the gas blowing member, and the diameter of the through hole 30 portion of the upper plate 3 is larger than the diameter of the through hole 20 of the gas blowing member. .

  As shown in FIG. 3, the nozzle 1 for molten steel storage container according to the first embodiment is used as a part of a steel outlet 13 at the bottom 12 of a container 11 in which molten metal of molten metal is stored. The steel outlet 13 includes a molten steel storage container nozzle 1, a slide gate 14, a slide gate refractory plate 15, and a lower nozzle 16. The slide gate refractory plate 15 has a hole penetrating in the vertical direction forming a part of the molten steel passage hole 5 in the center portion, and is held by the slide gate 14. The slide gate 14 has an upper opening and a lower central portion protruding downward in a cylindrical shape. A lower nozzle 16 described later is fitted into the protruding inner peripheral side. The lower nozzle 16 has a hole penetrating in the vertical direction forming a part of the molten steel passage hole 5. The slide gate 14 slides vertically with respect to the vertical direction by the slide rod 17 together with the slide gate refractory plate 15 and the lower nozzle 16. The steel output port 13 controls the amount of steel output of the molten steel in the container 11 and stops the steel output by this sliding movement. FIG. 3 shows a state in which the molten steel in the container 11 passes through the molten steel passage hole 5, and the slide gate 14, the slide gate refractory plate 15 and the lower nozzle 16 are slid by the slide rod 17. Then, the steel out of the molten steel in the container 11 is stopped.

  According to the molten steel storage container nozzle 1 of the first embodiment, the diameter of the molten steel passage hole 5 of the upper plate 3 that forms part of the molten steel passage hole 5 is a gas blowing member that forms part of the molten steel passage hole 5. Since the diameter is larger than 2, the molten steel is difficult to flow between the contact portion 311 of the upper plate 3 that is in close contact with the bottom surface 22 of the gas blowing member 2 in the steel output state, and the wear of the adhesive can be prevented. Therefore, since it is possible to prevent the molten steel from entering the outer peripheral side of the gas blowing member 3, the air groove 23 can be prevented from closing.

  Moreover, the gas blowing passage hole of the gas blowing member 2 is an open cell of a porous body or a hole penetrating radially, so that the amount of gas blown out to the molten steel passage hole 5 is increased or the gas is blown out. Therefore, the gas blowing passage hole is difficult to close.

  Further, the gas blowing member 2 has a corrosion resistance because the bottom surface 22 is bonded to the contact portion 311 of the upper plate 3 by a mortar, and can be adhered.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the said embodiment. For example, although the upper plate 3 and the upper nozzle 4 are separate members, they may be formed as a single member. Further, in the steel outlet 13, the slide gate 14, the slide gate refractory plate 15, and the lower nozzle 16 slide together by the slide rod 17, but the slide gate 14 and the slide gate refractory plate 15 are connected to each other. A structure having a lower fixing plate and a lower nozzle that slide and do not move downward may be used.

1: Nozzle for molten steel storage container, 11: Container, 12: Bottom, 13: Steel outlet, 14: Slide gate,
15: Refractory plate for slide gate, 16: Lower nozzle, 17: Slide rod,
2: gas blowing member, 20, 30, 40: through hole, 22: bottom surface, 23: air groove,
3: upper plate (lower part of gas blowing member), 31: main body, 311: close contact, 32: frame
4: Upper nozzle,
5: Molten steel passage hole,
6: Mortar.

Claims (1)

It is a nozzle for a molten steel storage container that penetrates in the vertical direction, divides a molten steel passage hole through which molten steel passes, and is located at the bottom of a container that stores the molten steel,
Forming part of the molten steel passage hole, and a gas blowing member having a gas blowing passage hole for supplying gas to the molten steel passage hole;
Forming a part of the molten steel passage hole, having a close contact portion in close contact with the bottom surface of the gas blowing member, a gas blowing member lower portion having a diameter of the molten steel passage hole larger than the diameter of the gas blowing member;
The nozzle for molten steel storage containers characterized by having.

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