Narrow copper plate for convex arc surface continuous casting crystallizer and its use method

Abstract

This application discloses a narrow copper plate for a convex arc surface continuous casting crystallizer and a method for using the same. The narrow copper plate includes a first working surface and a second working surface, two second working surfaces are provided, the first working surface is connected to the two second working surfaces, and the connection points between the first working surface and the second working surface are first connecting lines, two first connecting lines are provided, the cross section of the first working surface is a convex arc line, the first working surface extends from the upper opening of the narrow copper plate to the lower opening of the narrow copper plate, and the convex height of the first working surface relative to the plane on which the two first connecting lines exist decreases from the upper opening of the narrow copper plate toward the lower opening of the narrow copper plate. In this application, the width of the first working surface is sufficient, and the change in the convexity of the first working surface is small, thereby reducing the probability of occurrence of significant edge crack defects and significant two-strand defects in the rolling process of a continuous casting slab.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to a Chinese patent application bearing application number 202211329292.4 and entitled "Narrow-face copper plate for convex arc-face continuous casting crystallizer and method for using the same," filed with the China Patent Office on October 27, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of continuous casting crystallizers, and more particularly to a narrow copper plate for a convex arc surface continuous casting crystallizer and a method for using the same. [Background technology]

[0003] Continuously cast slabs are the main base material for producing high-performance medium-thickness slabs and wide-width thick slabs. In actual continuous slab casting, high-temperature molten steel solidifies in a crystallizer consisting of two water-cooled wide-surface copper plates with a cooling water tank structure on the back side and two water-cooled narrow-surface copper plates with a cooling water tank structure on the back side, forming a solidified shell with a specific shape and excellent surface quality. As the slab is withdrawn downward, it gradually solidifies completely in the secondary cooling strand, forming a slab that meets the quality, shape, and size standards.

[0004] The shape of the narrow end of a continuously cast slab is an important factor affecting the morphology of the slab's mid-slab edge during the rolling process. During actual rolling of medium- and wide-thick slabs, the flat or nearly flat narrow end of the slab gradually changes from flat to a two-strand and then a single-strand shape. During this process, the narrow end of the mid-slab gradually rotates up and down toward the edge of the steel plate. Because the current rolling process for medium- and wide-thick slabs makes it difficult to control the high temperature of the mid-slab edge, a morphological defect called "squeezing" is likely to occur during the rolling process of the mid-slab's narrow end. This leads to thin linear crack defects, and the mid-slab's narrow end flips up and down toward the edge of the steel plate, resulting in edge crack defects. The expansion of the slab's narrow end during the continuous casting process further increases the width of the mid-slab's narrow end flipping toward the edge of the steel plate, further deteriorating the quality of the steel plate's edge. Strictly restricting the bulge on the narrow face of the continuously cast slab, especially making the narrow face of the continuously cast slab have a large concave arc structure, is the key to reducing the significant edge crack defects formed during the rolling process of wide and thick slabs.

[0005] Both Patent No. 201520673254.X (utility model) and Patent No. 201610796688.8 (invention patent) disclose a method for producing slabs with a narrow concave structure using a crystallizer copper plate with a bump structure in the transverse center of the narrow working surface. The crystallizer copper plate designed in these two patents has a radius of 150-300 mm and a convex height of 5-12 mm in the transverse center of the working surface, with the convex arc surfaces transitioning to the base surfaces on both sides of the copper plate's edges via transition surfaces tangent to it. Using a crystallizer copper plate with this structure enables the production of narrow concave slabs with a right-angle structure, which can partially reduce the significant edge cracking defects that occur during the rolling process of wide-width, thick slabs. However, in order to smoothly transition between the convex arc surface in the widthwise center of this narrow copper plate and the base surfaces on both sides, a wide transition area is required. This results in a very narrow arc-shaped convex surface in the transverse center of the narrow copper plate used in the crystallizer. As a result, the convex arc surface in the transverse center of the narrow copper plate becomes very concentrated, i.e., the convex structure changes abruptly. As a result, the narrow side of the cast product produced by this crystallizer becomes suddenly concave, and the narrow side of the cast product is prone to forming a roughly "triangular" concave structure. When rolling wide-width, thick slabs, double-strand defects are easily formed at the edges of the intermediate slab when rolling this shape. Large fold defects are particularly likely to occur at the edges of steel plates with large aspect ratios.

[0006] Therefore, it is necessary to design a new narrow copper plate in which the width of the arc-shaped convex surface in the central region in the width direction is sufficient to avoid the formation of an approximately ``triangular'' concave structure on the narrow surface of the cast piece due to a large change in the arc-shaped convexity. Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above, the present application provides a narrow-surface copper plate for a convex arc surface continuous casting crystallizer and a method for using the same. [Means for solving the problem]

[0008] Specifically, the technical solutions include the following:

[0009] In one aspect, A narrow copper plate of a convex arc surface continuous casting crystallizer, The narrow copper plate includes a working surface, the working surface including a first working surface and a second working surface; two second work surfaces are provided, one of the second work surfaces is provided on one side of the first work surface, the other of the second work surfaces is provided on the other side of the first work surface, and the two second work surfaces are provided opposite each other; The first work surface is connected to each of the two second work surfaces, and the connection points between the first work surface and the second work surface are first connection lines, and two first connection lines are provided; The narrow copper plate of the convex arc surface continuous casting crystallizer has a convex arc surface cross section, the first working surface is a convex arc line, the first working surface extends from an upper opening of the narrow copper plate to a lower opening of the narrow copper plate, and the convex height of the first working surface relative to a plane on which the two first connecting lines exist decreases from the upper opening of the narrow copper plate to the lower opening of the narrow copper plate.

[0010] In another aspect, a method for using a narrow copper plate of a convex arc surface continuous casting crystallizer, comprising: configuring a crystallizer with the narrow copper plate of the convex arc surface continuous casting crystallizer; The method for using the narrow copper plate of a convex arc surface continuous casting crystallizer is provided, wherein during the operation of the crystallizer, cooling water is introduced into the cooling water tank of the narrow copper plate, the flow rate of the cooling water in the cooling water tank of the narrow copper plate is 6 m / s or more, and the difference between the inlet temperature and the outlet temperature of the cooling water in the cooling water tank of the narrow copper plate is 5 to 9°C. [Effects of the Invention]

[0011] The beneficial effects of the technical solution of the present application include at least the following:

[0012] In the present application, the first working surface is configured as a convex arc surface, and the first working surface and the second working surface are directly connected, so that the width of the first working surface is sufficient, the change in the convexity of the first working surface is small, and the change in the convexity of the first working surface is too large, forming an approximately "triangular" concave structure on the narrow surface of the slab, thereby reducing the probability of the occurrence of significant widthwise crack defects and significant double-strand defects in the rolling process of continuously cast slabs. [Brief explanation of the drawings]

[0013] In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings necessary for describing the embodiments will be briefly described below. However, the drawings in the following description are only some embodiments of the present application, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without any creative efforts. [Figure 1] FIG. 2 is a schematic diagram of a mounting structure of a narrow copper plate in a crystallizer according to an embodiment of the present application. [Figure 2] 1 is a structural schematic diagram of a narrow-surface copper plate according to an embodiment of the present application; [Figure 3] 1 is a schematic diagram of the side structure of the working surface of the lower opening side of a narrow copper plate according to an embodiment of the present application. FIG. [Figure 4] 1 is a structural schematic diagram of a cooling surface of a narrow copper plate according to an embodiment of the present application; [Figure 5] FIG. 1 is a schematic diagram of the cross-sectional structure of a narrow copper plate where the upper opening side working surface and the lower opening side working surface meet in one embodiment of the present application. [Figure 6] FIG. 10 is a schematic diagram of the cross-sectional structure of a narrow copper plate where the upper opening side working surface and the lower opening side working surface meet according to another embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0014] Throughout the above-mentioned drawings, one clear example of the present application is shown, which will be described in more detail below. These drawings and textual description are not intended to limit the scope of the present concepts in any way, but rather to explain the present concepts to those skilled in the art with reference to a specific example.

[0015] Hereinafter, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0016] Before describing the embodiments of the present application in more detail, it should be noted that directional terms such as "above," "below," and "side" in the examples of the present application do not limit the scope of protection of the present application.

[0017] To make the technical solutions and advantages of the present application clearer, the following describes the embodiments of the present application in more detail with reference to the drawings. Example 1

[0018] This example describes a narrow copper plate for a convex arc-shaped continuous casting crystallizer. The narrow copper plate 100 includes a work surface, which includes a first work surface 1 and a second work surface. Two second work surfaces are provided, one on one side of the first work surface 1 and the other on the other side of the first work surface 1. The two second work surfaces are arranged opposite each other. The first work surface 1 is connected to each of the two second work surfaces. The connection points between the first work surface 1 and the second work surface are first connection lines L1. There are two first connection lines L1. The cross section of the first work surface 1 is a convex arc-shaped line. The first work surface 1 extends from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate. The convex height of the first work surface 1 relative to the plane where the two first connection lines L1 exist decreases as it moves from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate.

[0019] As shown in FIG. 1, the crystallizer includes two wide-surface copper plates 200 and two narrow-surface copper plates 100. In this embodiment, the crystallizer containing the narrow-surface copper plates 100 continuously casts a narrow-surfaced, concave slab 300 with a right-angled structure and a thickness of 175 to 650 mm. As shown in FIG. 2, the upper opening 4 of the narrow-surface copper plate 100 is located at the upper end of the narrow-surface copper plate 100, and the lower opening 5 of the narrow-surface copper plate 100 is located at the lower end of the narrow-surface copper plate 100. The working surface is the side that comes into contact with the solidified shell, and the first working surface 1 is a convex arc surface that protrudes toward the cavity of the crystallizer. The protruding height of the first working surface 1 relative to the plane on which the two first connecting lines L1 exist is understood to refer to the distance that the first working surface 1 extends into the cavity of the crystallizer. The two second work surfaces are located on both sides of the first work surface 1, and are arranged symmetrically with respect to the vertical central axis plane of the first work surface 1. The vertical central axis planes of the two narrow-surface copper plates 100 are the same plane. The connection points between the first work surface 1 and the second work surface are first connection lines L1, and the two second work surfaces form two first connection lines L1 with the first work surface 1, and the protruding height of the first work surface 1 relative to the plane on which the two first connection lines L1 exist decreases from the upper opening 4 of the narrow-surface copper plate to the lower opening 5 of the narrow-surface copper plate.

[0020] In this embodiment, a transition surface is provided between the first work surface 1 and the two second work surfaces, and the first work surface 1 and the second work surfaces are directly connected. As a result, the width of the first work surface 1 is sufficient and the change in protrusion of the first work surface 1 is small, giving the slab 300 a wide and large concave arc structure. However, the change in protrusion of the first work surface 1 is too large, forming an approximately "triangular" concave structure on the narrow side of the cast slab. This reduces the probability of significant widthwise crack defects and significant double-strand defects occurring during the rolling process of continuously cast slabs.

[0021] The provision of the second working surface provides the slab 300 with a right-angle structure, thereby preventing the corners of the slab 300 from becoming too cold in the secondary cooling strand and controlling horizontal cracks at the corners of the slab 300 during the continuous casting process. Furthermore, the protruding height of the first working surface 1 relative to the plane on which the two first connecting lines L1 are located decreases from the upper opening 4 of the narrow copper plate toward the lower opening 5 of the narrow copper plate. This allows the crystallizer using the narrow copper plate 100 to perform continuous casting with a larger taper, resulting in finer crystal grains at the corners of the slab 300 formed by solidification, reducing the occurrence of horizontal cracks at the corners of the slab 300. Furthermore, wear of the first working surface 1 in the region near the lower opening 5 of the narrow copper plate is significantly reduced, thereby extending the service life of the narrow copper plate 100.

[0022] Optionally, the plane in which the upper opening 4 of the narrow copper plate exists is parallel to the plane in which the lower opening 5 of the narrow copper plate exists, the maximum vertical distance between the first working surface 1 and the plane in which the two first connecting lines L1 exist within the plane in which the upper opening 4 of the narrow copper plate exists is a first length l1 of the upper opening, the maximum vertical distance between the first working surface 1 and the plane in which the two first connecting lines L1 exist within the plane in which the lower opening 5 of the narrow copper plate exists is a first length l1 of the lower opening, the vertical distance between the plane in which the upper opening 4 of the narrow copper plate exists and the plane in which the lower opening 5 of the narrow copper plate exists is 780 to 1200 mm, and the difference between the first length l1 of the upper opening and the first length l1 of the lower opening is 0.2 to 4 mm.

[0023] Furthermore, the distance from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate is in the height direction of the narrow copper plate 100, and at any height, the highest point of the first working surface 1 is on the vertical central axis plane of the narrow copper plate 100. In this embodiment, the first length l1 of the upper opening is 8 to 40 mm, and at each of the other heights, the maximum vertical distance between the first working surface 1 and the plane on which the two first connecting lines L1 exist decreases linearly from the upper opening 4 of the narrow copper plate to the first length of the lower opening as it moves toward the lower opening 5 of the narrow copper plate.

[0024] 2, the width of the upper opening 4 of the narrow copper plate is a fifth length l5, which indicates the width direction of the narrow copper plate 100, and the width of the lower opening 5 of the narrow copper plate is a sixth length l6. 5は The fifth length l5 is 1 to 4 mm longer than the sixth length l6, and decreases linearly to the sixth length l6 from the upper opening 4 of the creepage copper plate to the lower opening 5 of the narrow surface copper plate.

[0025] Optionally, as shown in FIG. 2, in this embodiment, the second working surface extends from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate, and the distance between the outer edge of the second working surface and the first connecting line L1 is a fourth length l4, which is maintained constant from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate. Depending on the thickness of the slab 300 produced by continuous casting, the fourth length l4 is 10 to 50 mm. As shown in FIG. 1, the thickness of the slab 300 refers to the direction indicated by the distance between the two wide copper plates 200.

[0026] Optionally, as shown in FIG. 2 , the second work surface includes an upper opening-side work surface 2 and a lower opening-side work surface 3, the upper opening-side work surface 2 and the lower opening-side work surface 3 being connected to each other, and the upper opening-side work surface 2 and the lower opening-side work surface 3 being sequentially arranged from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate, the upper opening-side work surface 2 being a straight surface, and the lower opening-side work surface 3 being an inclined surface, and the lower opening-side work surface 3 being inclined in a direction opposite to the protruding direction of the first work surface 1. Furthermore, the lower opening-side work surface 3 has four sides including the outer edge L2 of the lower opening-side work surface, the first connecting line L1, the lower edge of the lower opening-side work surface, and the upper edge of the lower opening-side work surface, the lower edge of the lower opening-side work surface being the intersection line between the lower opening-side work surface 3 and the lower opening 5 of the narrow copper plate, and the upper edge of the lower opening-side work surface being the intersection line between the lower opening-side work surface 3 and the upper opening-side work surface 2. The lower opening-side work surface 3 slopes away from the extension plane of the upper opening-side work surface 2 as it moves from the first connecting line L1 toward the outer edge L2 of the lower opening-side work surface, and also slopes away from the extension plane of the upper opening-side work surface 2 as it moves from the upper edge of the lower opening-side work surface toward the lower edge of the lower opening-side work surface.

[0027] Furthermore, as shown in Figures 2 and 3, the narrow copper plate 100 includes a cooling surface 6, which is opposite the working surface, and a cooling water tank for cooling the continuously cast slab 300 is provided on the cooling surface 6, and the cooling surface 6 includes a side plane, which is opposite the second working surface, and the side plane and the upper opening side working surface 2 are arranged parallel to each other, and the lower opening side working surface 3 includes a first vertex O2, which is on the connection line between the lower opening side working surface 3 and the lower opening 5 of the narrow copper plate, and which is located away from the first connection line L1, and the vertical distance between the first vertex O2 and the side plane is the shortest vertical distance between the lower opening side working surface 3 and the side plane. The first vertex O2 is the intersection of the lower edge of the lower opening-side working surface and the outer edge L2 of the lower opening-side working surface. The vertical distance between the first vertex O2 and the side plane is the seventh length l7. The vertical distance between the upper opening-side working surface O2 and the side plane is the third length l3. The difference between the third length l3 and the seventh length l7 is the eighth length l8. In this embodiment, the third length l3 is 35 to 45 mm, and the eighth length l8 is 0.25 to 4 mm. Furthermore, the value of the eighth length l8 is generally equal to or greater than the difference between the first length l1 of the upper opening and the first length l1 of the lower opening.

[0028] Furthermore, in one embodiment, as shown in FIG. 5, the cooling surface 6 includes two side planes and a central arcuate surface, and in another embodiment, as shown in FIG. 6, the cooling surface 6 includes two side planes and a central plane.

[0029] Furthermore, in this embodiment, the upper opening side working surface 2 has four sides including the outer edge of the upper opening side working surface, the first connecting line L1, the lower edge of the upper opening side working surface, and the upper edge of the upper opening side working surface, and the lower edge of the upper opening side working surface is the intersection line between the lower opening side working surface 3 and the upper opening side working surface 2, and the upper edge of the upper opening side working surface is the intersection line between the upper opening side working surface 2 and the upper opening 4 of the narrow copper plate, and the outer edge of the upper opening side working surface is an edge that is arranged parallel to and opposite the first connecting line L1, and it is understood that the outer edge of the upper opening side working surface and the outer edge L2 of the lower opening side working surface meet at the first end point O1.

[0030] Furthermore, it is understood that the second work surface includes an upper opening-side work surface 2 and a lower opening-side work surface 3, the lower opening-side work surface 3 includes an outer edge portion L2 of the lower opening-side work surface, and the upper opening-side work surface 2 includes an outer edge portion of the upper opening-side work surface, and the outer edges of the upper opening-side work surface and the outer edge portion L2 of the lower opening-side work surface are in contact to form the outer edge of the second work surface. The distance between the outer edge of the second work surface and the first connecting line L1 is a fourth length l4, and the fourth length l4 is maintained constant from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate. The widthwise distance between the two first connecting wires L1 of the narrow copper plate 100 decreases linearly from the upper opening 4 to the lower opening 5 of the narrow copper plate, and it is understood that the widthwise distance between the two first connecting wires L1 of the narrow copper plate 100 within the plane of the upper opening 4 of the narrow copper plate is 1 to 4 mm longer than the widthwise distance between the two first connecting wires L1 of the narrow copper plate 100 within the plane of the lower opening 5 of the narrow copper plate. The inclined lower opening-side working surface 3 reduces the amount of shrinkage compensation due to the lower opening of the crystallizer during solidification of the slab 300, further reducing wear on the lower opening 5 of the narrow copper plate caused by the slab 300 during production, thereby extending the service life of the narrow slab 300.

[0031] Optionally, the distance that the upper opening side working surface 2 extends from the upper opening 4 of the narrow copper plate to the lower opening side working surface 3 is a second length l2, and the second length l2 accounts for 25% to 75% of the vertical distance between the plane where the upper opening 4 of the narrow copper plate exists and the plane where the lower opening 5 of the narrow copper plate exists. In this embodiment, the vertical distance between the plane where the upper opening 4 of the narrow copper plate exists and the plane where the lower opening 5 of the narrow copper plate exists is 780 to 1200 mm, depending on the height of the crystallizer and the drawing speed in continuous casting, and the second length l2 is generally 250 to 600 mm.

[0032] Optionally, as shown in FIGS. 4, 5, and 6, the narrow copper plate 100 includes fastening holes 7, a first cooling water tank 8, and a second cooling water tank 9, the fastening holes 7 are arranged in multiple rows, and the multiple rows of fastening holes 7 are arranged symmetrically with respect to the vertical central axis plane of the narrow copper plate 100, and a first cooling water tank 8 and a second cooling water tank 9 are arranged between two adjacent rows of fastening holes 7, and two first cooling water tanks 8 and multiple second cooling water tanks 9 are provided, and both the first cooling water tank 8 and the second cooling water tank 9 extend in the height direction of the narrow copper plate 100. Two first cooling water tanks 8 are arranged adjacent to the two rows of fastening holes 7, respectively, and multiple second cooling water tanks 9 are located between the two first cooling water tanks 8, and the bottom of the first cooling water tank 8 is closer to the first work surface 1 than the bottom of the adjacent second cooling water tank 9, and the bottoms of the multiple second cooling water tanks 9 are on the same arc plane.

[0033] Furthermore, as shown in FIG. 4, the cooling surface 6 is provided with fastening holes 7, a first cooling water tank 8, a second cooling water tank 9, and a tilting water tank 10, and the fastening holes 7 are bolt holes. In this embodiment, the width direction is the extension direction of the fifth length l5. Generally, depending on the thickness of the continuously cast slab to be produced, the cooling surface 6 has two to four rows of fastening holes 7 arranged in the width direction to secure the narrow-surface copper plate 100 to the stainless steel back plate of the crystallizer. The first cooling water tank 8, the second cooling water tank 9, and the tilting water tank 10 are evenly distributed in the width direction of the narrow-surface copper plate 100, and the first cooling water tank 8, the second cooling water tank 9, and the tilting water tank 10 have the same width. As shown in FIGS. 5 and 6, the first cooling water tank 8 and the second cooling water tank 9 are recessed vertically toward the plane on which the two first connecting lines L1 exist, and the tilting water tank 10 is recessed at an angle toward the center of the second work surface. In this embodiment, when the tilting water tank 10 tilts toward the center of the second work surface, if the angle between the axis of the tilting water tank 10 and the upper opening side work surface 2 is θ1, θ1 is generally 65 to 80°.

[0034] 4, two first cooling water tanks 8 and a plurality of second cooling water tanks 9 are provided between two adjacent rows of fastening holes 7. Here, the two first cooling water tanks 8 and the plurality of second cooling water tanks 9 refer to the first cooling water tanks 8 and the second cooling water tanks 9 between two adjacent rows of fastening holes 7, and therefore it can be understood that the plurality of first cooling water tanks 8, the plurality of second cooling water tanks 9, and the two inclined water tanks 10 are provided across the entire cooling surface 6, while the plurality of first cooling water tanks 8, the plurality of second cooling water tanks 9, and the two inclined water tanks 10 are provided symmetrically with respect to the vertical central axis plane of the narrow-surface copper plate 100.

[0035] Furthermore, as shown in FIGS. 5 and 6, the first cooling water tank 8, the second cooling water tank 9, and the inclined water tank 10 all have a bottom 11 with a semicircular structure.

[0036] Optionally, as shown in Figures 5 and 6, the cross section of the first work surface 1 in the plane where the upper opening side work surface 2 and the lower opening side work surface 3 are in contact becomes the reference convex arc line L3, and the convex arc line L4 of the cross section of the arc surface on which the bottoms 11 of the multiple second cooling water tanks 9 exist is arranged so as to be parallel to the reference convex arc line L3.

[0037] Furthermore, the plane where the upper opening-side working surface 2 and the lower opening-side working surface 3 meet is the cross section of the narrow copper plate 100 at the height where the first end point O1 exists. The convex arc line L4 of the cross section of the arc surface where the bottoms 11 of the multiple second cooling water tanks 9 exist is obtained by vertically translating the reference convex arc line L3 by 20 to 30 mm toward the cooling surface 6.

[0038] Furthermore, the vertical distance between the bottom of the second cooling water tank 9 and the bottom of the adjacent first cooling water tank 8 is a ninth length l9, which is 1 to 3 mm in this embodiment.

[0039] In this embodiment, the structures and arrangements of the first cooling water tank 8, the second cooling water tank 9, and the tilted water tank 10 allow heat to be transferred uniformly across the width of the narrow copper plate 100 of the crystallizer.

[0040] In this embodiment, a crystallizer using the narrow copper plate 100 of the above-mentioned convex arc surface continuous casting crystallizer is further disclosed. When arranging two narrow copper plates 100, the distance between the upper opening 4 of the two narrow copper plates 100 is made larger than the distance between the lower opening 5 of the two narrow copper plates 100. This makes the crystallizer wider at the top and narrower at the bottom, and can give the crystallizer a predetermined reverse taper, and the reverse taper of the crystallizer is 1.05% to 1.35%.

[0041] In this embodiment, the use method of the narrow copper plate 100 of the convex arc surface continuous casting crystallizer is further disclosed, during the process of the crystallizer, cooling water is introduced into the cooling water tank of the narrow copper plate 100, the amount of cooling water of the narrow copper plate 100 varies depending on the structure of the water tank, the flow rate of the cooling water in the cooling water tank of the narrow copper plate 100 is 6 m / s or more, and the difference between the inlet temperature and outlet temperature of the cooling water in the cooling water tank of the narrow copper plate 100 is 5 to 9 °C.

[0042] The cooling water tanks of the narrow-surface copper plate 100 are the first cooling water tank 8, the second cooling water tank 9, and the inclined water tank 10, and the amount of cooling water varies depending on the structure of the water tank. It is understood that the flow rate of the cooling water in the cooling water tank of the narrow-surface copper plate 100 is 6 m / s or more, and the difference between the inlet temperature and outlet temperature of the cooling water in the cooling water tank is 5 to 9°C.

[0043] By using the narrow copper plate 100 of this embodiment and providing the first and second work surfaces 1 and 2, a narrow concave slab 300 with a right-angle structure can be produced. This limits the width of edge cracks to within 20 mm from the edge during the rolling process of medium-thickness or wide-thickness slabs from cast slabs. Furthermore, the corner temperature during the solidification process of the slab 300 in the secondary cooling strand is ensured to be close to the corner temperature of a conventional right-angle continuously cast slab 300, thereby reducing the probability of corner cracks occurring in the slab 300. The slab 300 produced using the narrow copper plate 100 of this embodiment has a wide, large concave arc-shaped structure in the transverse center of the narrow face, thereby avoiding the narrow face folding defects caused by the rolling of the disclosed concave slab with a severe transition. In this embodiment, wear at the lower opening 5 of the narrow copper plate is reduced, significantly extending the service life of the narrow copper plate 100. By continuously casting the slab 300 using the narrow-surface copper plate 100 of this embodiment, it becomes possible to increase the taper of the narrow surface of the crystallizer and perform continuous casting. Example 2

[0044] The narrow copper plate 100 with a convex arc surface for use in a crystallizer for continuous casting of a 300 mm thick slab 300 has a height of 900 mm, a fifth length l5 in the width direction of the upper opening 4 of the narrow copper plate is 316 mm, a sixth length l6 in the width direction of the lower opening 5 of the narrow copper plate is 314 mm, and the difference between the fifth length l5 and the sixth length l6 is 2 mm. As shown in Figure 2, the width of the narrow copper plate 100 decreases linearly from the fifth length l5 to the sixth length l6 as it moves from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate.

[0045] The narrow copper plate 100 includes a work surface on the side that contacts the solidified shell and a cooling surface 6 with a cooling water tank facing the work surface. The work surface of the narrow copper plate 100 is divided into second work surfaces on both sides in the width direction and a first work surface 1 in the center. The second work surfaces on both sides are connected to the first work surface 1 in the center by a first connection line L1. Here, as shown in FIG. 2, the second work surface is divided into an upper opening-side work surface 2 and a lower opening-side work surface 3 in the height direction of the narrow copper plate 100. Both the upper opening-side work surface 2 and the lower opening-side work surface 3 on both sides are arranged symmetrically with respect to the vertical central axis of the narrow copper plate 100.

[0046] As shown in FIG. 2, the upper opening-side work surface 2 has four sides, including the outer edge of the upper opening-side work surface, the first connecting line L1, the lower edge of the upper opening-side work surface, and the upper edge of the upper opening-side work surface. The lower edge of the upper opening-side work surface is the intersection line between the lower opening-side work surface 3 and the upper opening-side work surface 2, and the upper edge of the upper opening-side work surface is the intersection line between the upper opening-side work surface 2 and the upper opening 4 of the narrow copper plate. The outer edge of the upper opening-side work surface is an edge that is parallel to and opposite the first connecting line L1. The distance between the outer edge of the upper opening-side work surface and the first connecting line L1 is a fourth length l4, which is 30 mm.

[0047] The lower opening-side work surface 3 has four sides, including the outer edge L2 of the lower opening-side work surface, the first connecting line L1, the lower edge of the lower opening-side work surface, and the upper edge of the lower opening-side work surface. The lower edge of the lower opening-side work surface is the intersection line between the lower opening-side work surface 3 and the lower opening 5 of the narrow copper plate, and the upper edge of the lower opening-side work surface is the intersection line between the lower opening-side work surface 3 and the upper opening-side work surface 2. The distance between the outer edge L2 of the lower opening-side work surface and the first connecting line L1 is a fourth length l4, and the fourth length l4 is 30 mm.

[0048] The outer edge L2 of the lower opening side working surface and the outer edge of the upper opening side working surface meet at a first end point O1.

[0049] 2, the upper opening side working surface 2 has a planar structure, and the distance between the upper opening side working surface 2 and the side plane of the cooling surface 6 is a third length l3, which is 40 mm. In the height direction of the narrow-surface copper plate 100, the height of the upper opening side working surface 2 is a second length l2, which is the distance extending from the upper opening 4 of the narrow-surface copper plate to the lower opening side working surface 3, and is 450 mm.

[0050] As shown in Figures 2 and 3, the narrow copper plate 100 includes a cooling surface 6, which is opposite to the working surface. The cooling surface 6 is provided with a cooling water tank for cooling the continuously cast slab 300. The cooling surface 6 includes a side plane, which is opposite to the second working surface. The side plane and the upper opening-side working surface 2 are parallel to each other. The lower opening-side working surface 3 includes a first vertex O2, which is located on the connecting line between the lower opening-side working surface 3 and the lower opening 5 of the narrow copper plate and extends from the first connecting line L1. The vertical distance between the first vertex O2 and the side plane is the shortest vertical distance between the lower opening-side working surface 3 and the side plane. The first vertex O2 is the intersection of the lower edge of the lower opening-side working surface and the outer edge L2 of the lower opening-side working surface, the vertical distance between the first vertex O2 and the side plane is the seventh length l7, the vertical distance between the upper opening-side working surface 2 and the side plane is the third length l3, and the difference in length between the third length l3 and the seventh length l7 is the eighth length l8, and in this embodiment, it is understood that the third length l3 is 40 mm and the eighth length l8 is 0.5 mm.

[0051] The lower opening side work surface 3 inclines away from the extension surface of the upper opening side work surface 2 as it moves from the first connection line L1 toward the outer edge L2 of the lower opening side work surface, and the lower opening side work surface 3 inclines away from the extension surface of the upper opening side work surface 2 as it moves from the upper edge of the lower opening side work surface toward the lower edge of the lower opening side work surface.

[0052] The first working surface 1 is a convex arcuate surface that protrudes toward the cavity of the crystallizer. Two second working surfaces are located on either side of the first working surface 1, and are arranged symmetrically with respect to the longitudinal central axis of the first working surface 1. It is understood that the longitudinal central axis of the two narrow-surface copper plates 100 is the same plane. The connection between the first working surface 1 and the second working surface is a first connecting line L1, and the two second working surfaces form two first connecting lines L1 with the first working surface 1. The protruding height of the first working surface 1 relative to the plane on which the two first connecting lines L1 exist decreases from the upper opening 4 of the narrow-surface copper plate toward the lower opening 5 of the narrow-surface copper plate. Within the plane in which the upper opening 4 of the narrow-surface copper plate exists, the maximum vertical distance between the first working surface 1 and the plane in which the two first connecting lines L1 exist is the first length l1 of the upper opening, the first length l1 of the upper opening is 12 mm, and the difference between the first length l1 of the upper opening and the first length l1 of the lower opening is 0.5 mm.

[0053] As shown in FIG. 5, in one embodiment, the cooling surface 6 includes two side planes and a central arcuate surface. As shown in FIG. 6, in another embodiment, the cooling surface 6 includes two side planes and a central plane. This embodiment focuses on the planar cooling surface 6 shown in FIG. 6. The cooling surface 6 has three rows of fastening holes 7 arranged in the width direction to secure the narrow-surface copper plate 100 to the stainless steel back plate of the crystallizer. Between any two rows of fastening holes 7 in the width direction of the narrow-surface copper plate 100, a first cooling water tank 8 and a second cooling water tank 9 are evenly arranged. The first cooling water tank 8 and the second cooling water tank 9 have the same width and are perpendicular to the plane on which the two first connecting lines L1 are located. As shown in FIG. 5, sloping water tanks 10 are provided on both edges of the cooling surface 6, respectively. The sloping water tanks 10 are sloping toward the center of the second working surface. The angle θ1 between the axis of the sloping water tank 10 and the upper opening-side working surface 2 is 75°.

[0054] The first cooling water tank 8, the second cooling water tank 9, and the inclined water tank 10 all have a semicircular bottom 11. The cross section of the first work surface 1 in the plane where the upper opening-side work surface 2 and the lower opening-side work surface 3 meet is the reference convex arc line L3, and the convex arc line of the cross sections of the bottoms of the multiple second cooling water tanks 9 on the same arc surface is L4, and the convex arc line L4 of the cross section of the arc surface where the bottoms 11 of the multiple second cooling water tanks 9 exist is set so as to be parallel to the reference convex arc line L3. The convex arc line L4 of the cross section of the arc surface where the bottoms 11 of the multiple second cooling water tanks 9 exist is obtained by vertically translating the reference convex arc line L3 by 20 mm toward the cooling surface 6.

[0055] 6, the vertical distance between the bottom of the second cooling water tank 9 and the bottom of the adjacent first cooling water tank 8 is a ninth length l9, which is 1.5 mm in this embodiment, allowing heat to be transferred uniformly across the width of the copper plate of this crystallizer.

[0056] In this embodiment, a crystallizer using the narrow copper plate 100 of the above-mentioned convex arc surface continuous casting crystallizer is further disclosed. When arranging two narrow copper plates 100, the distance between the upper opening 4 of the two narrow copper plates 100 is made larger than the distance between the lower opening 5 of the two narrow copper plates 100. This makes the crystallizer wider at the top and narrower at the bottom, and can give the crystallizer a predetermined reverse taper, and the reverse taper of the crystallizer is 1.05% to 1.35%.

[0057] In this embodiment, the use method of the narrow copper plate 100 of the convex arc surface continuous casting crystallizer is further disclosed, during the process of the crystallizer, cooling water is introduced into the cooling water tank of the narrow copper plate 100, the amount of cooling water of the narrow copper plate 100 varies depending on the structure of the water tank, the flow rate of the cooling water in the cooling water tank of the narrow copper plate 100 is 6 m / s or more, and the difference between the inlet temperature and outlet temperature of the cooling water in the cooling water tank of the narrow copper plate 100 is 5 to 9 °C.

[0058] As used herein, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying any relative importance. "Plurality" means two or more, unless expressly limited otherwise.

[0059] Other embodiments of the present application will readily occur to those skilled in the art after practicing the present application and the present application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques known in the art that are not disclosed herein. The present specification and examples are intended to be illustrative only.

[0060] The above are only preferred embodiments of the present application, and do not limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. [Explanation of symbols]

[0061] 100-Narrow copper plate 200-wide copper plate 300-Slab 1-1st work surface 2-Upper opening side work surface 3-Lower opening side work surface 4-Narrow copper plate upper opening 5-Narrow copper plate lower opening 6-cooling surface, 7-fastening hole 8-1st cooling water tank 9-Second cooling water tank 10-Tilted Water Tank 11-bottom L1 - First connecting line L2 - Outer edge of lower opening side work surface L3-Reference convex arc line L4 - Convex arc line of the cross section of the arc surface where the bottoms of multiple second cooling water tanks exist l1 - First length of upper opening l2 - second length l3 - third length l4 - fourth length l5 - fifth length l6 - 6th length l7 - 7th length l8 - 8th length l9 - 9th length O1-1st endpoint O2 - First vertex θ1 - Angle between the axis of the inclined water tank and the work surface on the upper opening side

Claims

1. A narrow copper plate of a convex arc surface continuous casting crystallizer, The narrow copper plate includes a work surface, and the work surface includes a first work surface located at the center of the narrow copper plate in the width direction, and a pair of second work surfaces adjacent to both ends of the first work surface in the width direction, a pair of first connecting lines defining boundaries between the first work surface and each of the second work surfaces; The cross section of the first working surface forms a convex arc line, and the first working surface and the second working surface extend from the upper opening of the narrow copper plate to the lower opening of the narrow copper plate; The second working surface is such that a distance between an outer edge of the second working surface and the first connecting line is kept constant from an upper opening of the narrow copper plate to a lower opening of the narrow copper plate; The second work surface is composed of an upper opening side work surface and a lower opening side work surface, The upper opening side work surface and the lower opening side work surface are connected to each other, the upper opening side work surface is a straight surface, the lower opening side work surface is an inclined surface, and the lower opening side work surface is inclined relative to the upper opening side work surface in a direction opposite to the protruding direction of the first work surface, A narrow-surface copper plate of a convex arc-surface continuous casting crystallizer, wherein the convex height of the first working surface relative to the plane on which the pair of first connecting lines exists decreases from the upper opening of the narrow-surface copper plate toward the lower opening of the narrow-surface copper plate.

2. 2. The narrow copper plate of the convex arc surface continuous casting and crystallization apparatus according to claim 1, wherein the width of the upper opening of the narrow copper plate is greater than the width of the lower opening of the narrow copper plate.

3. the narrow copper plate includes a cooling surface, the cooling surface includes a side plane, the side plane is arranged opposite to the second work surface, and the side plane and the upper opening side work surface are arranged in parallel; The lower opening side working surface includes a first vertex, the first vertex being on a connection line between the lower opening side working surface and the lower opening of the narrow copper plate, and the first vertex being spaced apart from the first connection line; 2. The narrow copper plate of the convex arc-surface continuous casting crystallizer according to claim 1, wherein the vertical distance between the first vertex and the side plane is the shortest vertical distance between the lower opening side working surface and the side plane.

4. On the upper opening side working surface, a distance extending from the upper opening of the narrow copper plate to the lower opening side working surface is a second length, The narrow-surface copper plate of the convex arc-surface continuous casting and crystallization apparatus according to claim 1, wherein the second length accounts for 25% to 75% of the vertical distance between the plane where the upper opening of the narrow-surface copper plate is located and the plane where the lower opening of the narrow-surface copper plate is located.

5. The narrow copper plate includes a fastening hole, a first cooling water tank, and a second cooling water tank; The fastening holes are provided in a plurality of rows, and the plurality of rows of fastening holes are provided symmetrically with respect to the vertical central axis plane of the narrow copper plate; the first cooling water tank and the second cooling water tank are provided between two adjacent rows of the fastening holes, two first cooling water tanks are provided, a plurality of second cooling water tanks are provided, the two first cooling water tanks are provided adjacent to the two rows of the fastening holes, and the plurality of second cooling water tanks are located between the two first cooling water tanks, a bottom of the first cooling water tank is closer to the first work surface than a bottom of the second cooling water tank adjacent thereto; The narrow copper plate of the convex arc surface continuous casting and crystallization apparatus according to claim 1, wherein the bottoms of the plurality of second cooling water tanks are on the same arc surface.

6. a cross section of the first work surface lying in a plane where the upper opening side work surface and the lower opening side work surface are in contact is a reference convex arc line; The narrow copper plate of the convex arc surface continuous casting crystallization apparatus described in claim 5, wherein the convex arc line of the cross section of the arc surface on which the bottoms of the multiple second cooling water tanks are located is arranged so as to be parallel to the reference convex arc line.

7. A method for using a narrow copper plate of a convex arc surface continuous casting crystallizer, comprising: configuring a crystallizer with the narrow copper plate of the convex arc surface continuous casting crystallizer according to any one of claims 1 to 6; A method for using a narrow copper plate of a convex arc-surface continuous casting crystallizer, wherein cooling water is introduced into the cooling water tank of the narrow copper plate during the working process of the crystallizer, the flow rate of the cooling water in the cooling water tank of the narrow copper plate is 6 m / s or more, and the difference between the inlet temperature and the outlet temperature of the cooling water in the cooling water tank of the narrow copper plate is 5 to 9°C.

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