JP6000137B2 - Molten steel scattering prevention device - Google Patents

Molten steel scattering prevention device Download PDF

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JP6000137B2
JP6000137B2 JP2013009295A JP2013009295A JP6000137B2 JP 6000137 B2 JP6000137 B2 JP 6000137B2 JP 2013009295 A JP2013009295 A JP 2013009295A JP 2013009295 A JP2013009295 A JP 2013009295A JP 6000137 B2 JP6000137 B2 JP 6000137B2
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molten steel
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cooling member
scattering prevention
cooling
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JP2014140851A (en
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惇 藪内
惇 藪内
秀士 中原
秀士 中原
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株式会社神戸製鋼所
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Description

The present invention relates to a molten steel scattering prevention device that prevents molten steel from scattering by capturing molten steel that is scattered during breakout of a continuous casting apparatus.

  Conventionally, in the continuous casting method, the molten steel produced from the converter, secondary refining equipment, etc. is transported to the tundish with a ladle, and the molten steel in the ladle is poured into the tundish, and then this tundish is used. The molten steel is continuously cast by supplying molten steel to the mold. The molten steel supplied to the mold is gradually cooled to become a solidified shell, which is pulled out from the lower side of the mold. Although rare during such work, the solidified shell may break and a breakout may occur in which unsolidified molten steel flows out. After the breakout occurs, the restoration work of the continuous casting apparatus is performed, but this restoration work is difficult and may take a lot of time. Therefore, various technologies (Patent Documents 1 and 2) have been developed that prevent the molten steel from scattering even in the rare occurrence of breakout, thereby suppressing damage to the continuous casting apparatus and reducing the burden of restoration work. .

In the metal spill prevention device of Patent Document 1, a flow control member capable of draining water is stretched between the frames, a protector having a rotating roller at the lower end thereof is attached to the inside of the support roll segment of the continuous casting machine, and the rotating roller is attached. The short side of the slab is brought into contact with a predetermined pressure.
In the molten metal flow prevention device of Patent Document 2, a tray whose upper part is covered with a refractory having a drain hole, a touch roller provided at one end of the tray, and a tray in a direction in which the touch roller is provided. A drive tray mechanism including a horizontally moving drive unit is provided so that the touch rollers are opposed to each other between the opposed frames of the vertical roller apron segments provided after the mold.

Japanese Patent Laid-Open No. 06-099258 JP 2001-212657 A

  In patent document 1, although the scattering of the molten steel at the time of a breakout can be suppressed to some extent, the actual situation is that the scattered molten steel cannot be entangled and fastened. Further, even in Patent Document 2, although the scattering of molten steel at the time of breakout can be suppressed to a certain extent, the scattered molten steel may flow out to the roll stand side, and the actual situation is that the molten steel cannot be entangled.

Therefore, in the present invention, by optimizing the structure of a cooling member or the like that cools the molten steel scattered at the breakout, the molten steel scattering prevention device can capture the molten steel scattered at the breakout and prevent the molten steel from scattering. The purpose is to provide.

In order to achieve the above object, the present invention has taken the following measures.
That is, the molten steel scattering preventing device of the present invention is a molten steel scattering preventing device that prevents molten steel from being scattered by capturing molten steel that is scattered during breakout of a continuous casting apparatus, and includes a plurality of cooling members that cool the molten steel. Each cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold, and with respect to the cooling member, the lower end of the cooling member is a mold of the continuous casting apparatus. 700 mm or more from the lower end, the distance between adjacent cooling members is 10 mm to 40 mm, the total cross-sectional area of the cooling member is 400 mm 2 or more, installed in the range of 10 mm to 50 mm from the slab, The strength of the mounting portion with the cooling member is not more than the breaking strength of the cooling member or the connecting member that connects the cooling member.

Further, another molten steel scattering preventing device of the present invention is a molten steel scattering preventing device that prevents molten steel from being scattered by capturing molten steel that is scattered during breakout of a continuous casting apparatus, and is a cooling device that cools the molten steel. The cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold, and the lower end of the cooling member is a mold of the continuous casting apparatus. The position of the gap formed in the cooling member is 10 mm to 40 mm, the total cross-sectional area of the cooling member is 400 mm 2 or more, and is set in the range of 10 mm to 50 mm from the slab. In addition, the strength of the attachment portion between the frame and the cooling member is not more than the breaking strength of the cooling member.

ADVANTAGE OF THE INVENTION According to this invention, the molten steel scattered at the time of a breakout can be capture | acquired reliably, and the scattering of molten steel can be prevented.

It is the schematic which attached the molten steel scattering prevention apparatus directly under the casting_mold | template. It is a front view of the various molten steel scattering prevention apparatus in 1st Embodiment. It is explanatory drawing explaining the shortest distance of cooling members. It is a front view of the various molten steel scattering prevention apparatus in 2nd Embodiment. It is explanatory drawing explaining the magnitude | size of a space | gap. It is explanatory drawing explaining attachment of a molten steel scattering prevention apparatus. It is a figure which shows the modification of a molten steel scattering prevention apparatus. It is a figure which shows the slot of a slab.

The molten steel scattering prevention device of the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, a molten steel scattering prevention device 1 is attached to a continuous casting device 3 that casts molten steel by pouring molten steel in a ladle into a mold 2 through a tundish. 3 prevents the molten steel from being scattered by capturing the molten steel that is scattered when a breakout occurs during casting. The continuous casting device 3 to which the molten steel scattering prevention device 1 is attached may be a vertical bending type continuous casting device 3 or a curved type continuous casting device 3 having no vertical portion.

  When continuous casting is performed by the continuous casting apparatus 3, the molten steel in the mold 2 gradually solidifies to become a solidified shell, but rarely breaks when the solidified shell comes out of the mold 2, and immediately below the mold 2. The molten steel may be scattered on the rolls (roll stand) provided in When molten steel scatters on rolls (roll stands), it takes a long time to restore the continuous casting apparatus 3. For this reason, even when a breakout occurs, the molten steel scattering prevention device 1 of the present invention prevents the molten steel from being scattered on the roll stand.

Hereinafter, the molten steel scattering prevention device 1 will be described in detail.
As shown in FIG. 1, the molten steel scattering prevention device 1 is attached to a frame (roll stand) 6 that supports a foot roll (referred to as a short-side foot roll) 5 installed immediately below the short side of the mold 2. .
Specifically, short-side foot rolls 5 are respectively provided immediately below both sides of the short side of the mold 2. Both the short side foot roll 5a installed on one side (left side of the drawing) and the short side foot roll 5b installed on the other side (right side of the drawing) are supported by the frame 6 installed on the short side of the mold 2, respectively. ing.

One or a plurality of short side foot rolls 5a on one side and short side foot rolls 5b on the other side are installed from directly under the mold 2 to the lower side. The short foot roll 5a on one side is supported by the first frame 6a installed on the left short side of the mold 2, and the short foot roll 5b on the other side is installed on the right short side of the mold 2. It is supported by the second frame 6b.
The molten steel scattering prevention device 1 is attached to the lower end of the first frame 6a and the lower end of the second frame 6b, respectively. In addition, although the foot roll (long side foot roll) is installed also in the continuous casting apparatus 3 just under the long side of the casting_mold | template 2, the molten steel scattering prevention apparatus 1 of this invention is the flame | frame which supports the short side foot roll 5. FIG. Therefore, the configuration on the long side foot roll side is omitted. The number of short side foot rolls 5 arranged in the casting direction is smaller than the number of long side foot rolls. That is, since the short side of the slab has less bulging than the long side, the number of short side foot rolls 5 is smaller than the number of long side foot rolls, and is in a limited range directly below the mold 2. It has been installed.

  FIG. 2 shows various molten steel scattering prevention devices 1. For convenience of explanation, the vertical direction in FIG. 2 is referred to as a vertical direction or a vertical direction, and the horizontal direction in FIG. 2 is referred to as a horizontal direction or a horizontal direction. Therefore, the direction from the upper side to the lower side in FIG. 2 is the casting direction, and the left-right direction in FIG. 2 is along the short side direction of the slab. The direction perpendicular to the lateral direction of the molten steel scattering prevention device 1 and the paper surface penetration direction in FIG. 2 is along the long side direction of the slab.

As shown in FIG. 2, the molten steel scattering prevention device 1 includes a plurality of cooling members 8. Depending on the shape and arrangement of each cooling member 8, a chain shape, a dumpling shape, a vertical strip shape, a horizontal strip shape, etc. There are several types.
As shown in FIG. 2 (a), the chain-shaped molten steel scattering prevention device 1a is made of metal and has a plurality of long-chain rings (cooling members) 8a arranged at predetermined intervals in the lateral direction (short side direction). It is constituted by arranging in order. The upper end of each chain 8 a is welded to the frame 6, and the chain 8 a is attached to the frame 6. In addition, when the chain 8a is viewed from above, the chain 8a may be arranged in a straight line in the lateral direction as shown in FIGS. 3A and 3B, or in addition to the short side direction. You may arrange in a zigzag form as a whole along the long side direction.

  As shown in FIG. 2 (b), the dumpling-shaped molten steel scattering prevention device 1b includes metal spheres (cooling members) 8b arranged in a vertical direction (vertical direction) at predetermined intervals and a sphere 8b arranged in a row. 9, the connecting members 9 connected in the vertical direction and connected to the spheres 8b are arranged at predetermined intervals in the horizontal direction. The upper end of the connecting member 9 that connects the spherical body 8 b is welded to the frame 6, so that the spherical body 8 b and the connecting member 9 are attached to the frame 6.

Moreover, as shown in FIG.2 (c), the vertical strip-shaped molten steel scattering prevention apparatus 1c arranges the plate-shaped metal vertical board material (cooling member) 8c extended in a vertical direction at a predetermined space | interval. The vertical plate member 8 c is attached to the frame 6 by welding the upper end of the vertical plate member 8 c to the frame 6.
Further, as shown in FIG. 2 (d), the horizontal strip-shaped molten steel scattering prevention device 1d is arranged with plate-shaped metal horizontal plate materials (cooling members) 8d extending in the horizontal direction at predetermined intervals. It is configured by connecting the cooling members 8d arranged side by side. By welding the upper end of the connecting member 10 that connects the horizontal plate member 8 d to the frame 6, the horizontal plate member 8 d and the connecting member 10 are attached to the frame 6.

Next, the cooling member which comprises the molten steel scattering prevention apparatus 1 is demonstrated in detail.
The lower end of the cooling member 8 is installed at a position 700 mm or more from the lower end of the mold 2 in any of the molten steel scattering prevention device 1 in a chain shape, dumpling shape, vertical strip shape, or horizontal strip shape.
As shown in FIG. 2, in the chain-shaped molten steel scattering prevention device 1 a, the lower end of the chain 8 a suspended from the frame 6 is at a position separated from the lower end of the mold 2 by 700 mm or more in the vertical direction. In the dumpling-shaped molten steel scattering prevention device 1b, the sphere 8b located on the lowermost side and the outermost surface of the sphere 8b is located at a position separated from the lower end of the mold 2 by 700 mm or more in the casting direction.

  Further, in the vertical strip-shaped molten steel scattering prevention device 1 c, the lower end of the vertical plate member 8 c suspended from the frame 6 is located at a position separated from the lower end of the mold 2 by 700 mm or more in the vertical direction. In the horizontal strip-shaped molten steel scattering prevention device 1d, the lower end of the lowermost horizontal plate 8d is at a position separated from the lower end of the mold 2 by 700 mm or more in the casting direction. Note that the lower end of the cooling member 8 may be located at a bending portion of the continuous casting apparatus 3.

  Thus, if the lower end of the cooling member 8 is set at a position more than 700 mm away from the lower end of the mold 2, the molten steel scattered from the slab at the breakout is received by the molten steel scattering prevention device 1, and the continuous casting device 3 Reaching the equipment located outside can be prevented. On the other hand, when the lower end of the cooling member 8 is less than 700 mm from the lower end of the mold 2, the effect cannot be sufficiently obtained because the molten steel scattered at the breakout cannot be sufficiently received. The cooling member 8 may be installed in the vertical bending type continuous casting apparatus 3 or the bending type continuous casting apparatus 3 having no vertical portion. Moreover, the lower end of the cooling member may be located at the bent portion.

  Moreover, even if it is any molten steel scattering prevention apparatus 1 of chain shape, dumpling shape, vertical strip shape, and horizontal strip shape, the distance of the adjacent cooling member 8, ie, the shortest distance L1 of the cooling member 8, is 10 mm-40 mm. It is in range. As shown to Fig.2 (a), in the chain-shaped molten steel scattering prevention apparatus 1a, the shortest distance L1 between the outer peripheral surfaces of the nearest chains is 10 mm-40 mm. As shown in FIG.3 (c), in the dumpling-shaped molten steel scattering prevention apparatus 1b, the shortest distance L1 between the outer peripheral surfaces of the nearest spheres 8b among the spheres 8b adjacent in the vertical direction is set to 10 mm to 40 mm. When the distance between the outer peripheral surfaces of the spheres 8b adjacent in the horizontal direction is shorter than the distance between the outer peripheral surfaces of the spheres 8b adjacent in the vertical direction, the shortest distance L1 is set to 10 mm to 40 mm. As shown in FIGS. 2 (c) and 2 (d), in the vertical strip-shaped molten steel scattering prevention device 1c and the horizontal strip-shaped molten steel scattering prevention device 1d, the shortest distance L1 between the plate members closest to the horizontal direction or the vertical direction is set. 10 mm to 40 mm.

Thus, if the distance of the adjacent cooling member 8 is made into the range of 10 mm or more and 40 mm or less, the molten steel at the time of a breakout can be smoothly passed between the cooling members 8, and the heat | fever of the molten steel in passage is the said cooling The member 8 can be efficiently taken and solidified, and the molten steel can be reliably captured (entangled).
On the other hand, when the distance between the adjacent cooling members 8 is less than 10 mm, it is difficult for the molten steel to enter between the cooling members 8 at the breakout, and it is difficult to take away the heat of the molten steel by the adjacent cooling members 8. It becomes difficult to keep inside. Moreover, when the distance of the adjacent cooling member 8 is larger than 40 mm, although molten steel can pass between the cooling members 8, molten steel cannot fully be cooled between the cooling members 8, and it is enough. In some cases, the molten steel that has not been cooled goes out to the outside through the cooling member, or the molten steel at the time of breakout directly goes out to the outside.

Furthermore, even if it is any molten steel scattering prevention apparatus 1 of chain shape, dumpling shape, vertical strip shape, and horizontal strip shape, the total cross-sectional area which totaled the cross-sectional area of each cooling member 8 shall be 400 mm < 2 > or more. In other words, each cooling member 8 is cross-sectioned in the vertical and horizontal directions, and the total cross-sectional area obtained by adding up the cross-sectional areas having the larger cross-sectional areas among the cross-sectional areas in the vertical and horizontal directions is 400 mm 2 or more. .

In the chain-shaped molten steel scattering prevention device 1a, each chain 8a is sectioned in the vertical direction, and the total sectional area of the total sectional area is 400 mm 2 or more. Specifically, one chain 8a is configured by connecting a plurality of annular bodies 11. However, by adding the cross-sectional areas in the vertical direction of all the annular bodies 11 constituting one chain 8a, 1 The cross-sectional area of the chain 8a is obtained, and the total cross-sectional area of all the chains 8a constituting the chain-shaped molten steel scattering prevention device 1a is defined as the total cross-sectional area.

Further, in the dumpling-shaped molten steel scattering prevention device 1b, the spheres 8b arranged in the longitudinal direction and the transverse direction are sectioned in the longitudinal direction, and the total sectional area obtained by summing the sectional areas (vertical sections passing through the center) of the respective spheres 8b is obtained. 400 mm 2 or more.
In the vertical strip-shaped molten steel scattering prevention device 1c, each vertical plate member 8c is sectioned in the vertical direction, and the total sectional area of the total sectional areas of the respective vertical plate members 8c is 400 mm 2 or more. In the horizontal strip-shaped molten steel scattering prevention device 1d, each horizontal plate member 8d is cross-sectioned in the horizontal direction, and the total sectional area of the total cross-sectional area of each horizontal plate member 8d is 400 mm 2 or more.

In this way, by setting the total cross-sectional area of each cooling member 8 to 400 mm 2 or more, it is possible to sufficiently secure the cooling ability for cooling the molten steel, and it is possible to cool the molten steel at the breakout.
The distance (separation distance) L3 from the slab 7 is set to a range of 10 mm to 50 mm in any of the molten steel scattering prevention device 1 in a chain shape, dumpling shape, vertical strip shape, or horizontal strip shape. That is, as shown in FIG. 1, the horizontal distance (separation distance) L3 between the outer peripheral surface of the slab 7 and the inner surface of the cooling member 8 is set to 10 mm to 50 mm.

  When the separation distance L3 is less than 10 mm, the scale attached to the outer peripheral surface (the outer peripheral surface on the short piece side) of the slab 7 in continuous casting and the cooling member 8 can easily come into contact with each other. There is a risk of scratching the surface. On the other hand, when the separation distance L3 exceeds 50 mm, the surface of the slab 7 will not be scratched, but since the cooling member 8 and the slab 7 are too far apart, It becomes difficult to receive by the cooling member 8. The solidification effect of the molten steel by the molten steel scattering prevention device 1 may be reduced.

  Now, when breakout occurs, molten steel adheres to the cooling member 8 and solidifies. After the breakout, for example, by pulling out the slab 7 from the mold 2, the molten steel scattering prevention device 1 is removed from the frame, but the strength of the mounting portion 17 for attaching the molten steel scattering prevention device 1 and the frame 6 is When it is larger than the breaking strength of the cooling member 8, a great amount of force is required to remove the molten steel scattering prevention device 1 from the frame, which makes it difficult to remove the molten steel scattering prevention device 1. Therefore, the strength of the mounting portion 17 for attaching the molten steel scattering prevention device 1 (cooling member 8) and the frame is such that the cooling member 8 at the time of breakout and the solidified solidified by cooling of the cooling member 8 can be supported. It is sufficient if removal is easy. In the present invention, the strength of the mounting portion 17 between the frame 6 and the cooling member 8 is equal to or less than the breaking strength of the cooling member 8 attached to the mounting portion 17 or the connecting member 9 attached to the mounting portion 17. . The strength of the mounting portion 17 is preferably in the range of 500 MPa to the breaking strength of the cooling member 8 or the connecting member 9. When the strength of the mounting portion 17 is less than 500 MPa, the molten steel scattering prevention device 1 may be removed from the frame during continuous casting (during operation).

  The attachment portion 17 is a welded portion (referred to as a welded portion) between the upper end portion of the chain 8a and the lower end portion of the frame 6 in the case of a chain shape, and the upper end portion of the connecting member 9 and the frame 6 in the case of a dumpling shape. In the case of a vertical strip shape, it is a welded portion between the upper end portion of the vertical plate member 8c and the lower end portion of the frame 6, and in the case of a horizontal strip shape, the upper end portion of the connecting member 9 and the frame It is a welding part with a lower end part.

As described above, according to the molten steel scattering prevention device 1, the cooling member 8 includes a plurality of cooling members 8 that cool the molten steel, and each cooling member 8 is attached to a frame that supports the short-side foot roll 5. The position is 700 mm or more from the lower end of the mold 2, the distance between adjacent cooling members 8 is 10 mm to 40 mm, the total cross-sectional area of the cooling member 8 is 400 mm 2 or more, and the range from 10 mm to 50 mm from the slab 7 Since the strength of the mounting portion 17 between the frame and the cooling member 8 is set to be equal to or less than the breaking strength of the cooling member 8 or the connecting member 9 that connects the cooling members 8 together, the molten steel at the time of breakout is cooled. The member 8 can be efficiently cooled and the molten steel can be quickly entangled. That is, the molten steel scattering prevention device 1 can reduce the scattering of molten steel during breakout, reduce the influence on the device, and shorten the recovery time.
[Second Embodiment]
In 1st Embodiment, although the molten steel scattering prevention apparatus 1 was comprised using the some cooling member 8, in 2nd Embodiment, the molten steel scattering prevention apparatus 1 was comprised using one cooling member 8. is there.

FIG. 4 shows the molten steel scattering prevention device 1 in the second embodiment.
As shown in FIG. 4, the molten steel scattering prevention device 1 includes one cooling member 8, and there are a plurality of types such as a lattice shape and a hole shape depending on the shape and arrangement of the cooling member 8. As shown to Fig.4 (a), the lattice-shaped molten steel scattering prevention apparatus 1e comprises the whole cooling member 8 by forming a metal bar in a grid | lattice form, and prevents the molten member 8 from splashing molten steel. The apparatus 1 is used. Specifically, the metal first wire 12 inclined to the left side is arranged at a predetermined interval, and the metal second wire 13 inclined to the right side is arranged at a predetermined interval while intersecting the first wire 12. Thus, the cooling member 8 is configured.

  As shown in FIG. 4 (b), the hole-shaped molten steel scattering prevention device 1f forms the entirety of the cooling member 8 by forming a plurality of through holes 15 in one metal plate 14, and the cooling member 8 is a molten steel scattering prevention device 1. Specifically, the cooling member 8 is configured by opening the through holes 15 at predetermined intervals in the horizontal direction of the plate member 14 and by forming the through holes at predetermined intervals in the vertical direction. The centers of the through holes adjacent in the vertical direction are shifted from each other in the width direction, and the through holes 15 are arranged on the plate member 14 in a staggered manner.

  Regardless of the lattice-shaped or hole-shaped molten steel scattering prevention device 1, the lower end of the cooling member 8 is installed at a position of 700 mm or more from the lower end of the mold 2 as in the first embodiment. ing. Specifically, in the grid-like cooling member 8, the lowermost end portion located on the lowermost side of the first wire 12 and the second wire 13 is installed at a position of 700 mm or more from the lower end of the mold 2. In the hole-shaped cooling member 8, the lower end portion of the plate material 14 is installed at a position of 700 mm or more from the lower end of the mold 2.

  Moreover, the size L2 of the space | gap formed in the cooling member 8 shall be 10 mm-40 mm even if it is any lattice-shaped and hole-shaped molten steel scattering prevention apparatus 1. As shown in FIG. 5A, in the lattice-shaped molten steel scattering prevention device 1e, the shorter one of the linear distance a between adjacent first wire rods 12 and the linear distance b between adjacent second wire rods 13 is short. The distance is the gap size L2, and the gap size L2 is in the range of 10 mm to 40 mm.

  Specifically, as shown in FIG. 5A, among the linear distance a between the first wire rods 12 and the linear distance b between the second wire rods 13, for example, the linear distance a between the first wire rods 12 is short. The linear distance a is the gap size L2, and the linear distance a is in the range of 10 mm to 40 mm. As shown in FIG.5 (b), in the hole-shaped molten steel scattering prevention device 1f, the through-hole 15 formed in the board | plate material 14 is made into a space | gap, and the diameter of the through-hole 15 made into the space | gap is in the range of 10 mm-40 mm. It is said.

Furthermore, in any of the lattice-shaped and hole-shaped molten steel scattering prevention device 1, the total cross-sectional area obtained by adding up the cross-sectional areas of the cooling members 8 is 400 mm 2 or more. In the lattice-shaped molten steel scattering prevention device 1e, the total cross-sectional area is a value obtained by adding all the cross-sectional areas of the first wire 12 and the second wire 13 constituting the cooling member 8. In the hole-shaped molten steel scattering prevention device 1f, the cross-sectional area of the through hole is subtracted from the cross-sectional area of the plate material to obtain the total cross-sectional area.

Regardless of the lattice-shaped or hole-shaped molten steel scattering prevention device 1, the distance (separation distance) L3 from the slab 7 is in the range of 10 mm to 50 mm. In the lattice-shaped molten steel scattering prevention device 1e, the distance from the first wire 12 to the cast piece 7 is the separation distance L3, and in the hole-shaped molten steel scattering prevention device 1f, the distance from the plate material 14 to the cast piece 7 is the separation distance L3. It becomes.
Regardless of the lattice-shaped or hole-shaped molten steel scattering prevention device 1, the strength of the attachment portion 17 between the frame 6 and the cooling member 8 is set to be equal to or less than the breaking strength of the cooling member 8.

The attachment portion 17 is a welded portion between the upper ends of the first wire 12 and the second wire 13 and the lower end portion of the frame in the case of a lattice, and the upper end portion of the plate member and the lower end of the frame in the case of a hole shape. It is a welding part with a part.
As described above, according to the molten steel scattering prevention device 1, the cooling member 8 is attached to the frame, the lower end of the cooling member 8 is positioned 700 mm or more from the lower end of the mold 2, and the size L2 of the gap is 10 mm to 40 mm. The total cross-sectional area of the member 8 is 400 mm 2 or more, and is installed in the range of 10 mm to 50 mm from the cast piece 7. Further, the strength of the mounting portion 17 between the frame and the cooling member 8 is less than the breaking strength of the cooling member 8. Has been.

  Table 1 shows a comparison between an example in which the molten steel scattering prevention device 1 according to the above-described embodiment was formed and cast, and a casting using a molten steel scattering prevention device 1 different from the molten steel scattering prevention device 1 of the present invention. An example is shown.

The continuous casting apparatus 3 was a vertical bending type. The number of short-side foot rolls 5 was a one-stage type in which one was provided in the vertical direction from directly below the mold 2, a three-stage type in which three were provided, and a seven-stage type in which seven were provided. The cooling member 8 used was a lattice, chain, hole, dumpling, vertical strip, or horizontal strip. The distance from the lower end of the mold 2 to the lower end of the cooling member 8 was 200 mm to 1700 mm. The shortest distance L1 between adjacent cooling members 8 or the size L2 of the gap was set to 5 to 45 mm. The total cross-sectional area of the cooling member 8 was 0 to 500 mm 2 . The separation distance L3 between the cooling member 8 and the slab 7 was 5 to 60 mm.

  FIG. 6 explains the attachment of the molten steel scattering prevention device by welding. The hatching in FIG. 6 shows the welded portion. As shown in FIG. 6, the molten steel scattering prevention device 1 and the frame 6 are attached to the frame when the upper side of the molten steel scattering prevention device 1 is spot-welded to the frame, and the upper end of the molten steel scattering prevention device 1 is attached to the frame 3. Three patterns were used: spot welding at the spot, and welding the entire upper end of the molten steel scattering prevention device 1 to the frame. The strength of the mounting portion was 490 to 2450N. The casting speed of the continuous casting apparatus was 1.2 to 2.0 m / min, the molten steel superheat degree was 15 to 50 ° C., the steel types were 40K steel and 50K steel, and the slab size was 230 × 800 to 1600 mm.

  In Examples and Comparative Examples, when breakout occurred, it was determined whether or not molten steel was scattered outside the continuous casting apparatus (outside the molten steel scattering prevention member). As shown in the column of the scattering prevention effect, the case where the molten steel stopped in the molten steel scattering prevention device was evaluated as “good”. In addition, when the cooling member 8 is sprinkled down, the molten steel is spattered from the lower part of the cooling member, the spattered from the gap of the cooling member, or the cooling member is cut (broken) during operation Was determined to be defective “x”.

Moreover, the presence or absence of the influence with respect to a roll stand was determined at the time of recovery after breakout occurrence (at the time of redrawing a slab). As shown in the column of equipment damage, when the foot roll stand breaks, the case where the foot roll stand is deformed is judged as bad `` x '', and when the slab is drawn again, the foot roll is not affected. It was.
Furthermore, it was determined by providing the molten steel scattering prevention device 1 whether or not a flaw occurred on the surface of the slab. As shown in FIG. 8 and the slab surface, the case where a linear defect occurs on the surface of the slab is defined as a failure “x”, and the case where a linear defect does not occur is indicated as “good”. did.

According to Examples 13 to 17, the lower end of the cooling member 8 is set to a position of 700 mm or more from the lower end of the mold 2 (distance column from below the mold), and the distance between the adjacent cooling members 8 is set to 10 mm to 40 mm (adjacent). (Shortest distance column), the total cross-sectional area of the cooling member 8 is 400 mm 2 or more (cross-sectional area column), and is installed in the range of 10 mm to 50 mm from the slab 7 (distance column from the slab), frame and cooling The strength of the mounting portion 17 with the member 8 is less than or equal to the breaking strength of the cooling member 8 or the connecting member 9 that connects the cooling member 8 (columns of strength and breaking strength of the mounting portion). The slab 7 was not attached to the slab 7 (evaluation result column).

Further, according to Examples 18 to 23, the position of the lower end of the cooling member 8, the size of the gap (adjacent shortest distance column), the total cross-sectional area of the cooling member 8, the distance from the slab 7, and the mounting portion 17. Since both of the strengths are within the range defined in the present invention, the molten steel can be prevented from scattering and the equipment can be protected, and no slabs of the slab 7 are generated.
On the other hand, according to Comparative Examples 1 to 12, the position of the lower end of the cooling member 8, the distance between the cooling members 8 or the size of the gap, the total cross-sectional area of the cooling member 8, the distance from the slab 7, Since one of the strengths was outside the conditions specified in the present invention, as shown in the evaluation result column, it may not be possible to prevent molten steel from being scattered or to protect the equipment, and a slab may be generated in the slab 7. there were.

  It should be noted that matters not explicitly disclosed in the embodiment disclosed this time, such as operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component, deviate from the range normally practiced by those skilled in the art. However, matters that can be easily assumed by those skilled in the art are employed. The molten steel scattering prevention device 1 is not limited to the above-described chain shape, dumpling shape, vertical strip shape, horizontal strip shape, lattice shape, or hole shape, but may be other shapes. As shown in FIG. 7, the molten steel scattering prevention device 1 may be configured by arranging two mountain-shaped cooling members 8 and connecting the parallel cooling members 8. In this case, the gap L2 is between the cooling members 8. Or you may comprise the molten steel scattering prevention apparatus 1 by providing the saw-tooth-like groove | channel (gagged groove | channel) in the cooling member 8 of 1 sheet.

DESCRIPTION OF SYMBOLS 1 Molten steel splash prevention apparatus 2 Mold 3 Continuous casting apparatus 5 Short side foot roll 5a Short side foot roll 5b on one side Short side foot roll 6 on the other side 6 Frame 6a First frame 6b Second frame 7 Cast piece 8 Cooling member 8a Chain 8b Sphere 8c Vertical plate member 8d Horizontal plate member 9 Connecting member 10 Connecting member 11 Annular body 12 First wire member 13 Second wire member 14 Plate member 15 Through hole 17 Mounting portion L1 Shortest distance L2 Size of gap

Claims (2)

  1. A molten steel scattering prevention device for preventing molten steel from being scattered by capturing molten steel scattered during breakout of a continuous casting apparatus,
    It comprises a plurality of cooling members for cooling the molten steel, each cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold,
    Regarding the cooling member, the lower end of the cooling member is at a position 700 mm or more from the lower end of the mold of the continuous casting apparatus, the distance between adjacent cooling members is 10 mm to 40 mm, and the total cross-sectional area of the cooling member is 400 mm 2 or more. It is installed in the range of 10 mm to 50 mm from the slab, and the strength of the mounting portion between the frame and the cooling member is set to be equal to or less than the breaking strength of the connecting member that connects the cooling member or the cooling member. A feature to prevent molten steel scattering.
  2. A molten steel scattering prevention device for preventing molten steel from being scattered by capturing molten steel scattered during breakout of a continuous casting apparatus,
    Comprising one cooling member for cooling the molten steel, the cooling member is attached to a frame that supports a foot roll on the short side provided at the lower end of the mold,
    Regarding the cooling member, the lower end of the cooling member is at a position of 700 mm or more from the lower end of the mold of the continuous casting apparatus, and the size of the gap formed in the cooling member is 10 mm to 40 mm. Molten steel having an area of 400 mm2 or more, installed in a range of 10 mm to 50 mm from the cast slab, and the strength of the mounting portion between the frame and the cooling member being equal to or less than the breaking strength of the cooling member Anti-scattering device.
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Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE788995A (en) * 1971-09-20 1973-01-15 Voest Ag Device used to facilitate the flow of the casting within the continuous casting facilities
AT322757B (en) * 1972-08-17 1975-06-10 Voest Ag Protective device for preventing of damage to a continuous casting plant
JPS5194422A (en) * 1975-02-19 1976-08-19
JPS55122958U (en) * 1979-02-16 1980-09-01
JPS56122552U (en) * 1980-02-15 1981-09-18
JPS6267651U (en) * 1985-10-18 1987-04-27
JPH03291130A (en) * 1990-04-09 1991-12-20 Nippon Stainless Steel Co Ltd Method for continuously casting stainless steel
JPH07136750A (en) * 1993-11-18 1995-05-30 Nippon Steel Corp Breakout protective device for continuous casting machine for thin slab
JP4325452B2 (en) * 2004-03-22 2009-09-02 Jfeスチール株式会社 Supporting guide method for short side of slab directly under continuous casting mold
JP2007245213A (en) * 2006-03-17 2007-09-27 Jfe Steel Kk Method of and device for pulverizing molten steel outflowing due to breakout in continuous casting

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