Metallic material for continuous casting

Abstract

To provide a metallic material for continuous casting with which the fall-down of the side surface part (solidified shell) of a cast slab pulled out from a mold is restrained and the leakage of unsolidified molten steel can be restrained.SOLUTION: The metallic material for continuous casting dipped into molten steel in a mold in the continuous casting of the molten steel has a base plate and supporting members erected at a plurality of end parts in the thickness direction extending in parallel with each other on one surface of the base plate in an opposed positional relation. In addition, it is preferable that the support member is provided to be inclined in a direction in which the support member spreads to the outside of the surface of the substrate.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a continuous casting hardware that is immersed in molten steel in a mold during continuous casting of molten steel. [Background technology]

[0002] In continuous casting of molten steel, molten steel held in a ladle is first poured into a tundish, and after the molten steel reaches a predetermined volume in the tundish, the molten steel is continuously poured into a mold through a submerged nozzle. The molten steel is then solidified and withdrawn from the mold to produce a slab, which is then cut to a predetermined length to produce slabs or other rolling materials.

[0003] In continuous casting of molten steel, when the final molten steel is withdrawn from the mold, it is necessary to seal the unsolidified molten steel inside by promoting the formation of a solidified shell of molten steel from the outside. That is, after the final molten steel is withdrawn from the mold, it is necessary to prevent leakage of the unsolidified molten steel from the top of the cast piece formed from the final molten steel. For this reason, technologies have been developed to suppress leakage of molten steel from the cast piece after the molten steel is withdrawn from the mold.

[0004] Patent Document 1 discloses a method in which, when the final molten steel is withdrawn from the mold, an iron plate having a shape similar to the horizontal shape in the mold is inserted below the surface of the molten steel and held there until the iron plate is fixed by solidification of the molten steel. Patent Document 2 discloses a method in which a ring-shaped metal object is rolled onto the surface of the molten steel for the purpose of safe introduction into the molten steel. Patent Document 3 discloses a head end chill material having a pair of opposing rectangular plate-shaped side walls and a top plate provided to cover the space between the upper ends of the side walls, in order to prevent molten steel leaking from the head end of the slab from flowing into the continuous casting machine. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 58-218344 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-263804 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-080773 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the hardware and methods disclosed in Patent Documents 1 to 3, when the hardware is immersed in molten steel in a mold, the molten steel flows over the hardware. After the slab is pulled out of the mold, a solidified shell and unsolidified molten steel coexist at the top of the slab. This causes the side of the slab (solidified shell) located above the hardware to collapse, resulting in the problem of leakage of unsolidified molten steel from that location.

[0007] The present invention has been made in consideration of the above circumstances, and its object is to provide a hardware for continuous casting that can prevent the side portion (solidified shell) of the cast piece from collapsing when pulled out of the mold and also prevent leakage of unsolidified molten steel. [Means for solving the problem]

[0008] [1] A continuous casting hardware that is immersed in molten steel in a mold during continuous casting of molten steel, the continuous casting hardware comprising a base plate and support members that are erected in an opposing positional relationship at multiple thickness-wise ends that extend parallel to each other on one surface of the base plate. [2] The continuous casting hardware described in [1], wherein the support member is provided at an angle in a direction extending outward from the surface of the base plate. [3] A continuous casting hardware as described in [1], in which a plurality of support members are provided at the thickness-wise end portion, and the lengths of the support members erected from the center position of the thickness-wise end portion toward the edge portion of the thickness-wise end portion increase in order. [4] The support members are provided in multiple positions at the thickness-wise end portion, inclined in a direction extending outward from the surface of the substrate, and the lengths extending from the center position of the thickness-wise end portion toward the edge of the thickness-wise end portion increase in order. [1] A continuous casting hardware as described in [1]. [5] The continuous casting hardware according to any one of [1] to [4], wherein a connecting portion is provided across the support members that are positioned opposite each other. [6] The continuous casting hardware according to any one of [1] to [5], wherein the base plate has a configuration in which a plurality of plate-like members are connected together. [Effects of the Invention]

[0009] According to the present invention, it is possible to prevent the side surface (solidified shell) of the cast slab pulled out of the mold from collapsing, and also to prevent leakage of unsolidified molten steel. [Brief explanation of the drawings]

[0010] [Figure 1] This is a diagram showing a flat metal piece and the state in which the flat metal piece is immersed in molten steel in a mold and the cast piece is then pulled out of the mold. [Figure 2] 1 is a diagram showing an example of a schematic configuration of a continuous casting hardware in a first embodiment. FIG. [Figure 3] FIG. 10 is a diagram showing an example of a schematic configuration of a support member for a continuous casting hardware in a second embodiment. [Figure 4] FIG. 10 is a diagram showing an example of a schematic configuration of a continuous casting hardware according to a third embodiment. [Figure 5] FIG. 10 is a diagram showing an example of a schematic configuration of a support member for a continuous casting hardware in a fourth embodiment. [Figure 6] FIG. 10 is a diagram showing an example of a schematic configuration of a continuous casting hardware according to a fifth embodiment. [Figure 7] FIG. 2 is a diagram for explaining a method for assembling (constructing) a metal fitting for continuous casting. [Figure 8] FIG. 2 is a diagram for explaining a method (installation method) for immersing a continuous casting hardware in molten steel. [Figure 9]FIG. 1 is a view showing an image of the top of a cast piece produced using the continuous casting hardware of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present inventors checked the state of the solidified shell and unsolidified molten steel at the top of the cast slab after it was withdrawn from the mold.

[0012] Figure 1 shows a conventionally used flat metal object and the state in which the flat metal object is immersed in molten steel in a mold and the slab is withdrawn from the mold. Figure 1(a) is a diagram showing the schematic structure of the flat metal object. Figures 1(b) to 1(d) are diagrams sequentially showing the process of immersing the flat metal object in molten steel in a mold and withdrawing the slab from the mold.

[0013] As shown in Figure 1(a), flat metal fitting 100 has a main plate 101 and a sub-plate 102. Flat metal fitting 100 has a configuration in which main plate 101 and sub-plate 102 are stacked on top of each other. Sub-plate 102 is attached to main plate 101 to adjust the weight of flat metal fitting 100. The area of ​​sub-plate 102 is configured to be smaller than that of main plate 101.

[0014] As shown in FIGS. 1(b) to 1(d), in continuous casting of molten steel, a flat metal member 100 is immersed in molten steel 300a in a mold 200, and a slab 300 is withdrawn from the mold 200. At this time, the slab 300 withdrawn from the mold 200 has unsolidified molten steel 300a and a solidified shell 300b. The solidified shell 300b is formed on the side surface of the slab 300 as the slab 300 is withdrawn from the mold 200. As shown in FIGS. 1(b) to 1(d), the area formed by the solidified shell 300b in the horizontal direction gradually increases as the slab 300 is withdrawn. The unsolidified molten steel 300a is sealed inside the slab 300 by the solidified shell 300b formed on the side surface of the slab 300.

[0015] 1(b) to 1(d), when a flat metal member 100 is immersed in molten steel 300a in a mold 200 and the slab 300 is pulled out of the mold 200, the unsolidified molten steel 300a at the top of the slab 300 wraps around above the flat metal member 100. Specifically, above the flat metal member 100, a solidified shell 300b is formed on the side of the slab 300, and unsolidified molten steel 300a is present sealed by the solidified shell 300b.

[0016] 1(c), as the operation of withdrawing the slab 300 progresses, the solidified shell 300b falls due to the solidification shrinkage of the unsolidified molten steel 300a. Furthermore, as shown in FIG. 1(d), the unsolidified molten steel 300a sealed inside the slab 300 also leaks from the point where the collapse of the solidified shell 300b occurs.

[0017] Here, the inventors of the present invention have focused on the positional relationship between the flat metal fitting 100 and the solidified shell 300b in consideration of the conditions under which the collapse of the solidified shell 300b occurs. Specifically, they have found that the collapse of the solidified shell 300b occurring in each of the states shown in Figures 1(c) and 1(d) is caused by the solidified shell 300b protruding (moving) above the flat metal fitting 100 as the flat metal fitting 100 is immersed. That is, they have found that when the metal fitting 100 is not in contact with the solidified shell 300b, the solidified shell 300b is no longer supported, making it more likely for the solidified shell 300b protruding above the metal fitting 100 to collapse. Based on these conditions, they have found that the collapse of the solidified shell 300b can be suppressed by providing a member that can contact the solidified shell 300b protruding above the flat metal fitting 100 from the inside of the slab 300.

[0018] First Embodiment A first embodiment of the present invention will be described below with reference to the drawings. Fig. 2 shows an example of the schematic configuration of a continuous casting hardware 10. In Fig. 2, taking into consideration the state in which the continuous casting hardware 10 is immersed in a mold, the horizontal direction as viewed in the drawing is the slab width direction M, and the directions toward the front and back are the slab thickness direction N. Furthermore, the vertical direction as viewed in the drawing is the casting direction T.

[0019] As shown in FIG. 2 , the continuous casting hardware 10 includes a base plate 11 and support members 12. The base plate 11 has thickness-direction end portions 11a that are end portions in the slab thickness direction N and extend along the slab width direction M with respect to a plane perpendicular to the casting direction T. The base plate 11 also has width-direction end portions 11b that are end portions in the slab width direction M with respect to a plane perpendicular to the casting direction T and extend along the slab thickness direction N with respect to a plane perpendicular to the casting direction T. The support members 12 are erected on one surface of the base plate 11 at the thickness-direction end portions 11a that extend parallel to each other. That is, the multiple support members 12 are arranged in a positional relationship on the base plate 11 so that they face each other. The support members 12 extend in a direction opposite to the casting direction T on the base plate 11.

[0020] When molten steel is solidified and then withdrawn from a mold to produce a slab, a solidified shell is formed on the side of the slab, while unsolidified molten steel remains inside the slab, as shown in Fig. 1. Therefore, when the continuous casting hardware 10 is immersed in molten steel, the support member 12 and the solidified shell can be brought into contact over the entire length of the support member 12 along the casting direction T. Furthermore, by bringing the support member 12 into contact with the solidified shell, the solidified shell wraps around the shape of the support member 12, and the contact state can be maintained throughout the continuous casting process.

[0021] That is, when the continuous casting hardware 10 is immersed in molten steel, even if the molten steel flows around above the base plate 11 of the continuous casting hardware 10, the solidified shell formed by the molten steel that has flowed around comes into contact with the support member 12. Therefore, by using the continuous casting hardware 10, it is possible to prevent the side portion (solidified shell) of the cast piece pulled out of the mold from collapsing, and it is also possible to prevent leakage of unsolidified molten steel.

[0022] Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. Fig. 3 shows an example of the schematic configuration of a support member 22 in a continuous casting hardware as the second embodiment. In Fig. 3, the horizontal direction into the drawing is the slab thickness direction N, and the vertical direction is the casting direction T, taking into account the state in which the continuous casting hardware is immersed in a mold.

[0023] As shown in Fig. 3, the support members 22 are preferably provided at the thickness direction end 21a of the substrate 21 so as to be inclined in a direction extending outward from the surface of the substrate 21. That is, the support members 22 are preferably provided at the thickness direction end 21a of the substrate 21 so as to be inclined in a direction away from the substrate 21 as they extend in a direction opposite to the casting direction T. Specifically, for the support members 22 shown in Fig. 3, the distance R between the upper ends thereof is preferably set to a distance corresponding to the maximum size of the cast strand in the thickness direction N.

[0024] When producing a slab by withdrawing molten steel from a mold while solidifying it, as shown in Fig. 1, the area of ​​the solidified shell formed in the horizontal direction gradually increases as the slab is withdrawn. Therefore, as shown in Fig. 3, by tilting the support member 22 with respect to the casting direction T, the support member 22 can be reliably brought into contact with the solidified shell, and the side portion of the slab (solidified shell) can be more reliably prevented from collapsing. Furthermore, according to this embodiment, when the continuous casting hardware is immersed in molten steel, the support member 22 is immersed along the inner slope of the solidified shell. Therefore, tilting of the continuous casting hardware with respect to the casting direction T can be more reliably prevented.

[0025] Third Embodiment A third embodiment of the present invention will be described with reference to the drawings. Fig. 4 shows an example of the schematic configuration of a continuous casting hardware 30. In Fig. 4, taking into consideration the state in which the continuous casting hardware 30 is immersed in a mold, the horizontal direction as viewed in the drawing is the slab width direction M, and the directions toward the front and back are the slab thickness direction N. Furthermore, the vertical direction as viewed in the drawing is the casting direction T.

[0026] 4, the continuous casting hardware 30 has a base plate 31 and support members 32 to 33. The support members 32 to 33 are provided on the end portion 31a of the base plate 31 in the thickness direction and stand on the base plate 31. That is, the support members 32 to 33 are provided on the end portion 31a of the base plate 31 in the thickness direction and extend in the direction opposite to the casting direction T when immersed in molten steel.

[0027] In continuous casting of molten steel, a slab removed from a mold is cooled while being sandwiched between multiple rolls. Therefore, the sandwiching of the slab between the rolls exerts pressure on the unsolidified molten steel inside the slab, causing fluctuations in the molten steel surface in the mold (hereinafter referred to as "bulging"). In particular, during continuous casting of extra-thick steel plates, which are large-sized slabs, the amount of molten steel is large, resulting in significant fluctuations in the molten steel surface in the mold due to bulging. Furthermore, when metal fittings are immersed in the molten steel in the mold, the pressure of the fluctuations in the molten steel surface due to bulging can cause deformation and breakage of the fittings, resulting in the problem of the broken parts falling off and equipment damage caused by the deformation.

[0028] Fluctuations in the molten steel surface caused by bulging are greater on the inside of the slab than on the outside in a plane perpendicular to the casting direction T. For this reason, when the continuous casting hardware 30 is immersed in molten steel in a mold, the influence of the fluctuations in the molten steel surface is greatest at the center position C of the base plate 31 in the slab width direction M, and the influence of the fluctuations in the molten steel surface is least at the edge P of the base plate 31.

[0029] 4, it is preferable that the lengths of the plurality of support members 32-33 provided at the thickness direction end 31a are configured so that the lengths of the support members 32-33 that are erected increase in order from the center position C of the thickness direction end 31a toward the edge P of the thickness direction end 31a. Specifically, it is preferable that the length of the support member 33 provided near the center position C of the thickness direction end 31a is shorter than the length of the support member 32.

[0030] 4, even if bulging occurs during continuous casting of molten steel, breakage of the support member 33 from the top of the slab and its protrusion in the thickness direction N of the slab can be suppressed after the slab is withdrawn from the mold, thereby suppressing damage to equipment and poor quality of the slab produced thereafter due to the protrusion of the support member 33. Furthermore, because the length of the support member 32 is longer than that of the support member 33 provided near the center position C, when the continuous casting hardware 30 is immersed in molten steel, the support member 33 can be completely immersed in the molten steel while the support member 32 can be accurately immersed in a state that follows the solidified shell of the slab.

[0031] Here, in the present invention, it is preferable to combine the configuration shown as the third embodiment (see FIG. 4) with the configuration shown as the second embodiment (see FIG. 3). Specifically, it is preferable that the support members 32-33 are provided at the thickness direction end 31a so as to be inclined in a direction extending outward from the surface of the substrate 31, and that the lengths of the support members 32-33 extending from the center position C of the thickness direction end 31a toward the edge P of the thickness direction end 31a increase in order. This configuration prevents breakage of the support members 32-33 due to the occurrence of bulging, ensures that the support members 32-33 contact the solidified shell, and reliably prevents the side surface of the slab (solidified shell) from collapsing.

[0032] <Fourth embodiment> Next, a fourth embodiment of the present invention will be described with reference to the drawings. Fig. 5 shows an example of the schematic configuration of a support member 42 in a continuous casting hardware as the fourth embodiment. In Fig. 5, the horizontal direction in the drawing is the slab thickness direction N, and the vertical direction is the casting direction T, taking into account the state in which the continuous casting hardware is immersed in a mold.

[0033] In the fourth embodiment, as shown in Fig. 5, connection portions 47 may be provided between the plurality of support members 42 in the slab thickness direction N. More specifically, as shown in Fig. 5(a), the connection portions 47 may be previously welded and installed along the slab thickness direction N of the substrate 41, and the support members 42 may then be welded to both ends of the connection portions 47. This makes it easier to install the plurality of support members 42 on the substrate 41.

[0034] As shown in Figure 5(a), by providing connecting portions 47 between the multiple support members 42 provided at the thickness-direction end portions 41a and joined to the surface of the base plate 41, it is possible to prevent the support members 42 from coming off the base plate 41 due to the collapse of the solidified shell of the slab when the slab is withdrawn from the mold. Furthermore, as shown in Figure 5(b), when connecting portions 47 are provided between the ends of the support members 42 on the side opposite the joint portion of the base plate 41, it is possible to generate a resistance force that counters the pressure of the collapse of the solidified shell. This not only reliably prevents the collapse of the solidified shell, but also prevents deformation of the top of the slab when it is withdrawn from the mold, making it possible to prevent breakage of the immersed continuous casting hardware.

[0035] Furthermore, in the third embodiment described above, it is more preferable that the connecting portion 47 be provided on the support member 33 located near the center position C of the thickness direction end portion 31a. In the third embodiment, the support member 33 is configured to be shorter than the support member 32 in the same embodiment, and therefore, when immersed in molten steel, the support member 33, including the connecting portion 47, can be completely immersed in the molten steel. Therefore, when the slab is pulled out of the mold, the connecting portion 47 is completely embedded in the top of the slab, which reliably prevents deformation of the top of the slab and breakage of the continuous casting hardware.

[0036] Here, in the present invention, it is preferable to combine the configuration shown as the fourth embodiment (see FIG. 5) with the configurations shown as the first to third embodiments (see FIGS. 2 to 4). Specifically, in the first embodiment, it is preferable to provide a connecting portion 47 extending between the support members 12 that are positioned opposite each other. In the second embodiment, it is preferable to provide a connecting portion 47 extending between the support members 22 that are positioned opposite each other. In the third embodiment, it is preferable to provide a connecting portion 47 extending between the support members 32 and 33 that are positioned opposite each other. By adopting such a configuration, in all embodiments, it is possible to reliably suppress the collapse of the solidified shell, suppress deformation of the uppermost portion of the slab when the uppermost portion is pulled out of the mold, and also suppress breakage of the immersed continuous casting hardware.

[0037] Fifth Embodiment A fifth embodiment of the present invention will be described with reference to the drawings. Fig. 6 shows an example of the schematic configuration of a continuous casting hardware 50. In Fig. 6, taking into consideration the state in which the continuous casting hardware 50 is immersed in a mold, the horizontal direction as viewed in the drawing is the slab width direction M, and the directions toward the front and back are the slab thickness direction N. Furthermore, the vertical direction as viewed in the drawing is the casting direction T.

[0038] 6, the continuous casting hardware 50 has a base plate 51 and support members 52 to 53. The support members 52 to 53 are erected on one surface of the base plate 51. That is, the support members 52 to 53 extend in a direction opposite to the casting direction T when immersed in molten steel.

[0039] As shown in FIG. 6 as a fifth embodiment, the substrate 51 preferably has a configuration in which a plurality of plate-shaped members are connected in the slab thickness direction N. Specifically, as shown in FIG. 6, the substrate 51 preferably has a configuration in which a first plate-shaped member 51A and a second plate-shaped member 51B are connected in the slab thickness direction N. The first plate-shaped member 51A and the second plate-shaped member 51B may be connected to each other via a bending portion 58 such as a hinge. In other words, the substrate 51 preferably has a configuration in which a plurality of plate-shaped members are connected in a direction perpendicular to the casting direction T.

[0040] As mentioned above, when bulging occurs during continuous casting of molten steel, fluctuations in the molten steel surface also occur. Therefore, the bending motion of the multiple plate-shaped members of the base plate 51 can absorb the pressure caused by the fluctuations in the molten steel surface, thereby suppressing damage to the continuous casting hardware 50.

[0041] 6 employs a configuration in which the base plate 51 is divided into a plurality of plate-shaped members in the slab thickness direction N, but the connection configuration of the plurality of plate-shaped members is not limited as long as the configuration can absorb fluctuations in the molten steel surface by bending. That is, the division configuration of the plurality of plate-shaped members in the base plate 51 may be such that the division is made in either the slab width direction M or the slab thickness direction N, and the number of plate-shaped members to be divided is also not limited.

[0042] Here, in the present invention, it is preferable to combine the configuration shown as the fifth embodiment (see FIG. 6) with the configurations shown as the first and second embodiments (see FIGS. 2 and 3). Specifically, in the first embodiment, it is preferable to configure the base plate 11 by connecting a plurality of plate-like members. In the second embodiment, it is preferable to configure the base plate 21 by connecting a plurality of plate-like members. By using such a configuration, even if bulging occurs in any embodiment, the bending action of the plurality of plate-like members can absorb the pressure caused by fluctuations in the molten metal surface, thereby suppressing damage to the continuous casting hardware.

[0043] Furthermore, it is preferable to combine the configuration shown as the third embodiment (see FIG. 4) with the configuration shown as the second embodiment (see FIG. 3) and the configuration shown as the fifth embodiment (see FIG. 6). Specifically, it is preferable that the support members 32 and 33 are provided at the thickness-direction end 31a so as to be inclined in a direction extending outward from the surface of the base plate 31, and that the lengths extending from the center position C of the thickness-direction end 31a toward the edge P of the thickness-direction end 31a increase in order, and that the base plate 31 be configured by connecting multiple plate-like members. With this configuration, even if bulging occurs, the bending action of the multiple plate-like members can absorb pressure caused by fluctuations in the molten metal surface, thereby suppressing damage to the continuous casting hardware.

[0044] Next, an assembly method (construction method) of a continuous casting hardware (see FIG. 7) in which the configuration shown as the fifth embodiment (see FIG. 6) is combined with the configuration shown as the fourth embodiment (see FIG. 5) and the configuration shown as the second embodiment (see FIG. 3) will be described. More specifically, an assembly method (construction method) of a configuration in which the connecting portion 47 in the fourth embodiment is provided on the surfaces of a plurality of plate-like members (first plate-like member 51A and second plate-like member 51B) in the fifth embodiment together with the support member 22 erected at an incline in the second embodiment will be described using FIG.

[0045] First, multiple plate-shaped members (first plate-shaped member 61A and second plate-shaped member 61B) are connected via bent portions 68 to form a base plate 61. Next, assuming a state in which the base plate 61 is immersed in molten steel in a mold, a holding mechanism 69 capable of fixing a rod-shaped member for suspending the continuous casting hardware from a tundish located above is welded to the top surface of the base plate 61. Although the shape of the holding mechanism 69 is shown as U-shaped in FIG. 7, any shape is acceptable as long as the holding mechanism 69 is capable of locking the rod-shaped member for suspending the hardware. Next, multiple connecting portions 67 are welded along the slab thickness direction N near the center position C of the base plate 61, and multiple connecting portions 67 are also welded along the slab thickness direction N at positions spaced apart from the center position C in the slab width direction M. Thereafter, the support members 62 and 63 are welded to both ends of the multiple connection portions 67 (ie, the thickness direction end portions 61a of the substrate 61) at an angle in a direction extending outward from the surface of the substrate 61, and are erected.

[0046] Next, with reference to FIG. 8, a method (installation method) for immersing the continuous casting hardware manufactured by the assembly method (construction method) in molten steel in a mold will be described.

[0047] First, as shown in FIG. 8(a), a rod-shaped member 600 for suspending the continuous casting hardware 60 is extended from a tundish 400 positioned above the continuous casting hardware 60 placed on a casting floor 500 near the mold 200, and is engaged with a holding mechanism 69 provided on the upper surface of a base plate 61 of the continuous casting hardware 60. Next, the tundish 400 is moved so that the continuous casting hardware 60, now suspended by the engagement of the rod-shaped member 600, is moved directly above the mold 200 (see FIG. 8(b)). Thereafter, the tundish 400 is lowered, and the continuous casting hardware 60 is immersed in the molten steel in the mold (see FIG. 8(c)). After a predetermined time (e.g., several tens of seconds) has elapsed in this state, the rod-shaped member 600 suspended from the tundish 400 melts (see FIG. 8(d)). Therefore, the tundish 400 is then raised to its original position, while the continuous casting hardware 60 is left in the molten steel in the mold (see FIG. 8(e)).

[0048] Here, a method for immersing a continuous casting hardware (see FIG. 7) in molten steel, which is a combination of the configuration shown as the fifth embodiment (see FIG. 6) with the configuration shown as the fourth embodiment (see FIG. 5) and the configuration shown as the second embodiment (see FIG. 3), will be specifically described. In this case, a configuration in which connecting portions 67 are provided on the first plate-shaped member 61A and the second plate-shaped member 61B is employed, and the continuous casting hardware is preferably immersed in molten steel so that at least the connecting portions 67 provided on the support members 63 are completely immersed. This is because completely immersing the support members 63 and the connecting portions 67 can suppress deformation at the top of the slab pulled out of the mold, and can also suppress breakage of the immersed continuous casting hardware.

[0049] In the above-described embodiments, the support member has been described as being configured as a rod-shaped long body, but the support member may be configured in any form as long as it is capable of suppressing the collapse of the side portion of the slab (solidified shell) and also suppressing the leakage of unsolidified molten steel. That is, it is not limited to a long body, and a plate-shaped configuration may also be adopted. [Example]

[0050] Next, an example will be described in which the continuous casting hardware of the present invention was immersed in molten steel and a cast piece was produced by continuous casting.

[0051] As an example of the invention, a continuous casting hardware (see Fig. 7) was used that combined the configuration shown as the fourth embodiment (see Fig. 5) and the configuration shown as the second embodiment (see Fig. 3). More specifically, a configuration was adopted in which a connecting portion 67 and a plurality of support members 63 were provided on the first plate-shaped member 61A and the second plate-shaped member 61B.

[0052] An image of the top of a cast slab produced by immersing the continuous casting hardware of the present invention in molten steel is shown in Figure 9. As shown in Figure 9, it was confirmed that when the continuous casting hardware of the present invention was used, the collapse of the solidified shell at the top of the slab could be suppressed without causing damage to the continuous casting hardware. [Explanation of symbols]

[0053] 10, 30, 50, 60 Continuous casting hardware 11, 21, 31, 41, 51, 61 boards 11a, 21a, 31a, 41a, 51a, 61a Ends in thickness direction 11b, 31b, 51b, 61b Width end 12, 22, 32, 33, 42, 52, 53, 62, 63 Support members 47, 67 Connection 51A, 61A First plate-shaped member 51B, 61B Second plate-shaped member 58, 68 Bends C center position M slab width direction N Cast slab thickness direction P edge R interval T Casting direction

Claims

1. A continuous casting hardware that is immersed in molten steel in a mold during continuous casting of the molten steel, A substrate; support members provided upright in an opposing positional relationship at a plurality of thickness direction ends extending parallel to each other on one surface of the substrate; A continuous casting hardware having the above.

2. 2. The continuous casting hardware according to claim 1, wherein the support members are provided at an angle in a direction extending outward from the surface of the base plate.

3. A continuous casting hardware as described in claim 1, wherein a plurality of support members are provided at the thickness-wise end portion, and the lengths of the support members erected from the center position of the thickness-wise end portion toward the edge portion of the thickness-wise end portion increase in order.

4. A continuous casting hardware as described in claim 1, wherein the support members are provided in multiple inclined positions at the thickness-wise end portions in a direction extending outward from the surface of the substrate, and the lengths of the support members extending from the center position of the thickness-wise end portions toward the edge of the thickness-wise end portions increase in order.

5. The continuous casting hardware according to any one of claims 1 to 4, wherein a connecting portion is provided between the support members that are positioned opposite each other.

6. The continuous casting hardware according to any one of claims 1 to 4, wherein the base plate has a configuration in which a plurality of plate-shaped members are connected together.

7. 6. The continuous casting hardware according to claim 5, wherein the base plate has a structure in which a plurality of plate-like members are connected together.

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