KR101722951B1 - Immersion nozzle - Google Patents

Immersion nozzle Download PDF

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Publication number
KR101722951B1
KR101722951B1 KR1020150109392A KR20150109392A KR101722951B1 KR 101722951 B1 KR101722951 B1 KR 101722951B1 KR 1020150109392 A KR1020150109392 A KR 1020150109392A KR 20150109392 A KR20150109392 A KR 20150109392A KR 101722951 B1 KR101722951 B1 KR 101722951B1
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KR
South Korea
Prior art keywords
discharge port
nozzle body
molten steel
nozzle
upper discharge
Prior art date
Application number
KR1020150109392A
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Korean (ko)
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KR20170016076A (en
Inventor
조현진
한상우
Original Assignee
주식회사 포스코
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Priority to KR1020150109392A priority Critical patent/KR101722951B1/en
Publication of KR20170016076A publication Critical patent/KR20170016076A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/507—Pouring-nozzles giving a rotating motion to the issuing molten metal

Abstract

The immersion nozzle according to the present invention includes a nozzle body having a durability to which molten steel can be moved, a lower discharge port formed on the sidewall of the nozzle body to be inclined downwardly from the durability in an outward direction, The nozzle body has a tube shape having an upper discharge port on an upper side of the lower discharge port on the side wall of the nozzle body for discharging molten steel of the inner rim and an inner space through which molten steel can move, And a partition wall that is inserted to extend from an upper portion of the nozzle body to an upper position of the lower discharge port and has an outer surface facing the upper discharge port spaced from the inner surface of the nozzle body.
Therefore, according to the present invention, the upper discharge port is separately provided above the lower discharge port, the discharge flow rate of the molten steel can be reduced, thereby making the bath surface more stable.

Description

Immersion nozzle}

The present invention relates to an immersion nozzle, and more particularly, to an immersion nozzle capable of controlling a flow rate of molten steel discharged from a discharge port.

The continuous casting process is a process in which a ladle containing refined molten steel is placed in a continuous casting machine, and the molten steel in a liquid state is changed from a ladle to a tundish to a mold, . At this time, the immersion nozzle is located at the bottom of the tundish and supplies the molten steel accommodated in the tundish to the mold.

The immersion nozzle is composed of a nozzle body having an inner work capable of moving molten steel and a discharge port through which the molten steel can move from the inner work to the mold. At this time, the molten steel supplied to the mold by the immersion nozzle has fluidity due to the flow rate or flow rate discharged through the discharge port.

On the other hand, the mold molten steel is first cooled and the primary cooling is influenced by the flow of the molten steel in the mold as a factor that determines the quality of the cast steel, and the rapid flow in the molten metal causes mixing of the mold flux, . Therefore, it is necessary to control the flow rate of the mold bath surface in order to reduce the mixing of the mold flux. The flow rate of the bath surface depends on the size of the discharge port of the immersion nozzle and the like.

However, when the thickness of the casting sheet to be produced is thin, a mold having a thin thickness is used as compared with when the thickness of the casting sheet is large. Accordingly, there is a limitation in enlarging the inner diameter of the immersion nozzle, Diameter of the study). Due to these limitations, the flow rate of molten steel discharged from the immersion nozzle can not be reduced to a certain level or less, and the mold bath surface becomes unstable.

Korean Patent Publication No. 2003-0054625

The present invention provides an immersion nozzle capable of controlling the flow rate of molten steel discharged from a discharge port.

The present invention also provides an immersion nozzle capable of stabilizing the flow in the mold bath surface and suppressing the incorporation of mold flux.

The immersion nozzle according to the present invention includes: a nozzle body having an inner circumference capable of moving molten steel; A lower discharge port formed on the sidewall of the nozzle body so as to be inclined downwardly in an outward direction from the inner rim and discharging molten steel of the inner rim to the outside; An upper discharge port located on the side wall of the nozzle body and spaced apart from the lower discharge port and discharging molten steel of the inner rim to the outside; The nozzle body is inserted into the nozzle body so as to extend from an upper portion of the nozzle body to an upper position of the lower discharge port, and an outer side surface facing the upper discharge port is inserted into the nozzle body, And a partition wall spaced apart from the inner side surface.

And the upper discharge port is formed so as to be inclined downward in the outward direction from the inside air passage.

The upper discharge port is formed so as to be inclined upward in the outward direction from the inner cavity.

The partition wall is installed such that at least an outer side surface facing the upper discharge port from an upper portion of the nozzle body is spaced from the inner side surface of the nozzle body.

The height of the lower end of the partition is equal to the height of the lower end of the upper discharge port so that the lower end of the partition is connected to the lower end of the upper discharge port.

The height of the lower end of the partition is lower than the height of the lower end of the upper discharge port so that the lower end of the partition is connected to the inner wall of the nozzle body between the upper discharge port and the lower discharge port.

The distance between the nozzle body and the outer surface of the partition wall is 40% or more of the distance between the center of the nozzle body in the width direction and the nozzle body.

According to the embodiment of the present invention, the upper discharge port is separately provided above the lower discharge port, the discharge flow rate of the molten steel can be reduced, thereby making it possible to further stabilize the bath surface.

1 is a schematic view showing a continuous casting machine according to an embodiment of the present invention;
2 is a cross-sectional view showing the immersion nozzle according to the first embodiment of the present invention
3 is a view schematically showing the flow of molten steel when the immersion nozzle according to the first embodiment is applied;
4 is a cross-sectional view showing the immersion nozzle according to the second embodiment of the present invention
5 is a view schematically showing the flow of molten steel when applying the immersion nozzle according to the first embodiment
6 is a view for explaining a separation distance between the nozzle body and the partition wall;
7 is a cross-sectional view showing another immersion nozzle according to the first modification of the present invention
8 is a cross-sectional view showing the immersion nozzle according to the second modification of the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. In the description, the same components are denoted by the same reference numerals, and the drawings are partially exaggerated in size to accurately describe the embodiments of the present invention, and the same reference numerals denote the same elements in the drawings.

1 is a schematic view showing a continuous casting machine according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating the immersion nozzle according to the first embodiment of the present invention, and FIG. 3 is a view schematically illustrating the flow of molten steel when the immersion nozzle according to the first embodiment is applied. FIG. 4 is a cross-sectional view illustrating an immersion nozzle according to a second embodiment of the present invention, and FIG. 5 is a view schematically showing the flow of molten steel when the immersion nozzle according to the first embodiment is applied. 6 is a view for explaining the distance between the nozzle body and the partition. 7 is a cross-sectional view showing another immersion nozzle according to the first modification of the present invention. 8 is a cross-sectional view illustrating an immersion nozzle according to a second modification of the present invention.

1 is a schematic view showing a general continuous casting facility;

Referring to FIG. 1, the continuous casting facility is located at the top of the tundish 30 in turn, with the ladle 10 carrying molten steel seated in the ladle turret unit 20. At this time, the ladle turret unit 20 is provided with the ladle pedestal 23 that is capable of placing the ladle 10 on both sides of the swing tower 21 that is driven to rotate, so that the ladle pedestal 13 is provided with at least two ladle 10 and placing the ladle 10 in the upper portion of the tundish 30 alternately by the rotation of the swing tower 21. [ A mold 60 for producing molten steel with a predetermined thickness and width is provided in the lower portion of the tundish 30 and a plurality of pinch rolls 62 for guiding the molten steel are disposed under the mold 40 Respectively. At this time, a collector nozzle 11 is provided on the bottom of the ladle 10 and connected to the collector nozzle 11 to pour molten steel in the ladle 10 to the tundish 30. A shovel nozzle 51 is provided on the bottom surface of the tundish 30 and an immersion nozzle 40 is provided on the bottom surface of the tundish 30 to allow the molten steel to flow out through the mold 60.

The shroud nozzle 51 connects the collector nozzle 11 under the ladle 10 and the tundish 30 to prevent contamination of the steel during injection of molten steel. The nozzle mounting unit 50 And is connected to the collector nozzle 11 by the operation of the nozzle mounting unit 50. [ In other words, a ring-shaped seat is provided at the horizontal axis end of the nozzle mounting unit 50 so that the shroud nozzle 51 is placed in a vertical state, and the nozzle mounting unit 50 is driven in accordance with the operation of the operator, The wood nozzle 51 is mounted on the collector nozzle 11 in the lower portion of the ladle 10 in a precise manner.

The molten steel contained in the ladle 10 flows out to the tundish 30 while the collector nozzle 11 and the shroud nozzle 51 are connected to each other. In this process, the shroud nozzle 51 is immersed in the molten steel in the tundish 30 to prevent the molten steel from coming into contact with the atmosphere or slag existing in the tundish 30 to be mixed with the molten steel.

The molten steel charged into the tundish 30 is injected into the mold 60 through the immersion nozzle 400 and the immersion nozzle 400 is immersed in the molten steel injected into the mold 60 at this time.

2 and 4, the immersion nozzle 400 according to the embodiments of the present invention includes a nozzle body 410 having an inner rim (inner space or empty space) through which molten steel can pass or move, An upper discharge port 420a and a lower discharge port 420b which are vertically spaced apart from each other on the body 410 so as to discharge the molten steel introduced into the inner rim so as to move to the outside of the dipping nozzle 400, And a partition 430 which is inserted into the inner space of the nozzle body 410 to be spaced apart from the inner wall of the nozzle body 410 and in which the space separated from the inner wall of the nozzle body 410 communicates with the upper discharge port 420a.

The nozzle body 410 is a means for supplying the molten steel of the tundish 30 to the mold and is installed so that the lower region provided with the upper discharge port 420a and the lower discharge port 420b is immersed in the molten steel in the mold. The nozzle body 410 is made of a refractory material, for example, made of a material such as alumina.

A plurality of discharge ports 420a and 420b for discharging molten steel introduced into the inner rim of the nozzle body 410 are provided in the vertical direction of the nozzle body 410 and discharge ports 420a and 420b , And 420b are the same or different from each other. More specifically, on the side surface or the side wall of the nozzle body 410, two discharge ports 420a and 420b are formed which are spaced apart from each other in the vertical direction and through which the discharge port of the inner rim can escape.

Here, the discharge port located relatively lower than the other discharge port is referred to as a lower discharge port 420b, and the discharge port located on the upper side relative to the lower discharge port 420b is referred to as an upper discharge port 420a.

The lower discharge port 420b is formed so as to be inclined downward from the inner circumference of the nozzle body 410 to the outside of the nozzle body 410 and the upper discharge port 420a, Is formed to be inclined downward or upward from the inner surface of the nozzle body 410 to the outside of the nozzle body 410.

The lower discharge port 420b is located below the upper discharge port 420a and is a kind of opening formed in a side portion or a side wall (hereinafter referred to as a side portion) of the nozzle body 410. [ That is, the lower discharge port 420b is formed in a side surface of the nozzle body 410 so that the molten steel in the inner space of the nozzle body 410 can escape to the outside of the nozzle body 410. Here, the lower discharge port 420b has a configuration corresponding to the discharge port of the general dipping nozzle 400 and has a shape inclined downward from the inside of the nozzle body 410 toward the outer side.

The upper discharge port 420a is located on the upper side of the lower discharge port 420b and is formed on the side surface of the nozzle body 410 in the same manner as the lower discharge port 420b described above, And is an opening that allows the user to escape to the outside. The upper discharge port 420a may be formed to be inclined downward from the hollow portion of the nozzle body 410 in the outward direction as in the first embodiment shown in FIG. In the outward direction.

That is, the immersion nozzle 400 according to the first embodiment has a separate upper discharge port 420a on the upper side of the lower discharge port 420b, and each of the lower discharge port 420b and the upper discharge port 420a, And is inclined downward. When the molten steel flows into the immersion nozzle 400, molten steel is discharged from each of the lower discharge port 420b and the upper discharge port 420a, and a predetermined flow or flow is generated in molten steel in the mold 60 by the discharged molten steel . At this time, two flows are generated in the vertical direction largely by the molten steel discharged from the immersion nozzle 400. That is, molten steel discharged from the lower discharge port 420b to the outside of the dipping nozzle 400 flows to the lower side of the lower end of the dipping nozzle 400 and the upper side of the lower end of the dipping nozzle 400 in the roll patterns A and B A flow or flow of a molten steel flow, that is, a double roll pattern, is generated. In the lower side of the lower end of the immersion nozzle 400, a molten steel flow in a roll pattern that moves from the immersion nozzle 400 toward the inner side wall of the mold, descends along the side wall, and rises toward the position of the immersion nozzle 400 (A) is generated. In the upper side of the lower end of the immersion nozzle 400, the molten steel discharged from the lower discharge port 420b and the upper discharge port 420a moves from the immersion nozzle 400 toward the inner side wall of the mold, rises along the side wall, The flow of the molten steel flow (B) in the roll pattern moving in the direction in which the molten steel flow (400) is located is stabilized.

As another embodiment of the immersion nozzle, the immersion nozzle 400 according to the second embodiment has a lower discharge port which is shaped to be inclined downwardly outwardly from the inner lining as in the first embodiment, and separately provided above the lower discharge port 420b The upper discharge port 420a is formed so as to be inclined upward from the inner circumference to the outer side. When the molten steel flows into the immersion nozzle 400, a flow pattern A of the roll pattern is generated in the same direction as in the first embodiment at the lower side of the lower end of the immersion nozzle 400. In the upper side of the lower end of the immersion nozzle 400, a flow in two directions is generated by the molten steel discharged from the downward inclined lower discharge port 420b and the upward inclined upper discharge port 420a. That is, the molten steel flow B in the roll pattern in which the molten steel generated from the lower discharge port 420b moves in the sidewall direction of the mold 60, rises along the side wall, and moves in the direction in which the immersion nozzle 400 is located from the side wall And a flow C from the immersion nozzle 400 toward the inner side wall of the mold is generated by the molten steel generated from the upper discharge port 420a. At this time, the flow C flowing from the immersion nozzle 400 toward the inner wall of the mold 60 by the molten steel discharged from the upper discharge port 420a is discharged from the side wall by the molten steel discharged from the lower discharge port 420b through the immersion nozzle 400 The molten steel flow B in the roll pattern moving in the direction in which the molten steel flows is collided with the molten steel surface at the molten metal surface. Therefore, the flow of the bath surface is stabilized.

According to the second embodiment, since the lower discharge port 420b is inclined downward and the upper discharge port 420a is formed so as to be inclined upward, the molten steel flow velocity is reduced by colliding with two molten steel flows near the bath surface, As compared to the case where both the lower discharge port 420b and the upper discharge port 420a are formed to be downwardly inclined as in the example, the flow velocity at the hot surface is further reduced, and thus the second embodiment is more effective than the first embodiment in terms of stabilizing the hot- .

In the present invention, the lower discharge port 420b and the upper discharge port 420a are provided in the immersion nozzle 400 to discharge the molten steel from each of them, so that the bath surface can be stabilized as compared with the conventional discharge method through one discharge port. That is, the amount of molten steel to be supplied to or discharged from the mold 60 per predetermined time is determined for casting of the cast steel, and as the flow velocity of the molten steel discharged from the discharge port increases, the molten steel flow rate becomes unstable, Is smaller. However, there is a limitation in expanding the size of the discharge port depending on the thickness of the casting mold, and therefore the unstable surface of the casting pan due to the discharge flow velocity of the molten steel has been continued.

In order to solve this problem, in the present invention, an upper discharge port 420a is provided on the upper side of the lower discharge port 420b so that molten steel introduced into the submerged nozzle 400 is divided into a lower discharge port and an upper discharge port 420a do. Therefore, according to the immersion nozzle 400 according to the embodiment of the present invention, the molten steel flow rate discharged from each of the lower discharge port 420b and the upper discharge port 420a can be lowered as compared with the case of having one discharge port as in the prior art, The bath surface can be stabilized.

In the present invention, the upper discharge port 420a is provided separately from the lower discharge port 420b so that the molten steel introduced into the hollow portion of the immersion nozzle 400 is discharged to the two discharge ports 420a and 420b, . When the molten steel flows into the hollow portion of the immersion nozzle 400, the molten steel is collided by the closed bottom portion of the lower portion of the nozzle body 410, and a large amount of molten steel is discharged through the lower discharge port 420b And the amount discharged through the upper discharge port 420a may be relatively small, which may reduce the stabilization effect of the hot water surface.

Therefore, in the present invention, the partition wall is installed in the nozzle body 410, and the partition wall 430 is installed so that a part of the molten steel introduced into the hollow portion of the nozzle body 410 can be guided or guided to the upper discharge port 420a stably. do. The partition wall 430 has an inner space and is formed in a tubular shape having upper and lower openings, and is inserted and installed in the inner surface of the nozzle body 410. The outer wall of the partition wall 430 is spaced apart from the inner wall of the nozzle body so that the space between the inner wall of the nozzle body 410 and the partition wall 430 is communicated with the upper discharge port 420a and the lower discharge port 420b, As shown in Fig. At this time, the distance D between the inner wall of the nozzle body 410 and the partition wall is set to be 40% or more of the distance R between the center of the nozzle body 410 in the width direction and the inner wall of the nozzle body 410 6). The partition wall 430 is spaced at least from the inner wall of the nozzle body 410 to the end of the upper discharge port so that the two discharge ports 420a and 420b are spaced apart from each other in a space between the upper discharge port 420a and the lower discharge port 420b. And is formed to separate the spaces therebetween.

2 and 4, the height of the lower end of the partition wall 430 is equal to the height of the lower end of the upper discharge port 420a, 420a. The inner space of the nozzle body 410 is a space between the inner wall of the nozzle body 410 and the partition and is a space extending from the upper portion of the nozzle body 410 to the lower end of the upper discharge port 420a, And the lower space of the upper discharge port 420a which communicates with the inner space of the partition 430 and the inner space of the partition 430 in the discharge space 410. When the molten steel is supplied into the nozzle body 410, a part of the molten steel moves to the inner space of the partition wall 430 and is discharged to the lower discharge port 420b. At least a portion of the molten steel flows into the nozzle body 410 Through the space between the side wall and the partition wall 430, and is discharged through the upper discharge port 420a.

As another example of the partition 430, as shown in FIGS. 7 and 8, the height of the lower end of the partition 430 is lower than the height of the lower end of the upper discharge port 420a And the lower end thereof is connected to the inner wall of the nozzle body 410 corresponding to the area between the upper discharge port 420a and the lower discharge port 420b. Accordingly, in the first and second modified examples, there is a spacing space between the inner wall of the nozzle body 410 and the partition 430 in a lower region of the upper discharge port 420a, and this is referred to as a step 431. According to the immersion nozzle 400, a part of the molten steel supplied to the nozzle body 410 moves to the inner space of the partition wall 430 and is discharged to the lower discharge port 420b, and at least another part of the molten steel flows into the nozzle body 410 Through the space between the inner wall of the partition wall 430 and the partition wall 430 and is discharged through the upper discharge port 420a. At this time, at least a part of the molten steel supplied to the spacing space between the inner wall of the nozzle body 410 and the partition wall 430 passes through the upper discharge port 420a and reaches the bottom of the step 431 located below the upper discharge port 420a So that the flow velocity rises in a decelerated state and is discharged to the upper discharge port 420a.

Therefore, when the height of the lower end of the partition wall 430 is lower than the height of the lower end of the upper discharge port 420a as in the first and second modified examples, discharge from the upper discharge port 420a It is possible to reduce the discharge speed of molten steel.

9 is a photograph showing a state of molten steel in a mold when molten steel is discharged from a general immersion nozzle. 10 is a photograph showing a state of a molten steel in a mold when molten steel is discharged from the immersion nozzle according to the first embodiment of the present invention.

9 and 10, when the molten steel is discharged from the immersion nozzle 400 provided with the upper discharge port 420a separately from the lower discharge port 420b as in the embodiment of the present invention, Is stabilized.

In the present invention, the upper discharge port 420a is provided above the lower discharge port 420b so that the molten steel introduced into the submerged nozzle 400 is divided into the lower discharge port 420b and the upper discharge port 420a. Therefore, according to the immersion nozzle 400 according to the embodiment of the present invention, the molten steel flow velocity discharged from each of the lower discharge port 420b and the upper discharge port 420a can be lowered as compared with the case of having one discharge port as in the prior art, The bath surface can be stabilized. And it is possible to reduce the occurrence of the casting defects due to instability of the casting surface, thereby improving the casting quality.

400: immersion nozzle 410: nozzle body
420a: upper discharge port 420b: lower discharge port
430:

Claims (7)

A nozzle body having an inner work capable of moving molten steel;
A lower discharge port formed on the sidewall of the nozzle body so as to be inclined downwardly in an outward direction from the inner rim and discharging molten steel of the inner rim to the outside;
An upper discharge port located on the side wall of the nozzle body and spaced apart from the lower discharge port and discharging molten steel of the inner rim to the outside;
The nozzle body is inserted into the nozzle body so as to extend from an upper portion of the nozzle body to an upper position of the lower discharge port, and an outer side surface facing the upper discharge port is inserted into the nozzle body, A partition wall spaced apart from the inner surface;
/ RTI >
And the upper discharge port is formed to be inclined downward from the inner circumference in an outward direction. delete A nozzle body having an inner work capable of moving molten steel;
A lower discharge port formed on the sidewall of the nozzle body so as to be inclined downwardly in an outward direction from the inner rim and discharging molten steel of the inner rim to the outside;
An upper discharge port located on the side wall of the nozzle body and spaced apart from the lower discharge port and discharging molten steel of the inner rim to the outside;
The nozzle body is inserted into the nozzle body so as to extend from an upper portion of the nozzle body to an upper position of the lower discharge port, and an outer side surface facing the upper discharge port is inserted into the nozzle body, A partition wall spaced apart from the inner surface;
/ RTI >
And the upper discharge port is formed so as to be inclined upwards outward from the inner circumference. The method according to claim 1 or 3,
Wherein the partition wall is installed such that at least an outer side surface facing the upper discharge port from the upper portion of the nozzle body is spaced apart from the inner side surface of the nozzle body. The method of claim 4,
Wherein a height of a lower end of the partition wall is equal to a height of a lower end of the upper discharge port, and a lower end of the partition is connected to a lower end of the upper discharge port. The method of claim 4,
Wherein a height of a lower end of the partition is lower than a height of a lower end of the upper discharge port so that a lower end of the partition is connected to an inner wall of the nozzle body corresponding to the gap between the upper discharge port and the lower discharge port. The method of claim 4,
Wherein the separation distance between the nozzle body and the outer surface of the partition wall is 40% or more of the distance between the center of the nozzle body in the width direction and the nozzle body.
KR1020150109392A 2015-08-03 2015-08-03 Immersion nozzle KR101722951B1 (en)

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KR102326867B1 (en) * 2020-10-21 2021-11-16 주식회사 포스코 Casting tool and casting method

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