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 title "Narrow-surface copper plate for convex-type arc-surface 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 crystallizer continuous casting, and in particular 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 slab base material for producing high-performance medium-thickness slabs, wide-width thick slabs, etc. In actual slab continuous 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 and two water-cooled narrow-surface copper plates with a cooling water tank structure on the back, forming a solidified shell with a specific shape and excellent surface quality, and 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 requirements.

[0004] The shape of the narrow surface of the continuous casting slab is an important factor affecting the change of the edge morphology of the middle slab of the slab during the rolling process. In the actual rolling of medium-thickness slabs and wide-thickness slabs, the narrow surface of the slab, which is flat or nearly flat, gradually changes from flat to two-strand and then to one-strand. During this process, the narrow surface of the middle slab gradually rotates up and down toward the edge of the steel plate. Because the current rolling process of medium-thickness slabs and wide-thickness slabs is difficult to control the edge of the middle slab at high temperature, the rolling process of the narrow surface of the middle slab is prone to the occurrence of a morphological defect called "squeezing", which leads to a thin line crack defect, and the narrow surface of the middle slab flips up and down to the edge of the steel plate, causing edge crack defects on the steel plate. When the narrow surface of the slab bulges generated in the continuous casting process, the width of the narrow surface of the middle slab that flips to the edge of the steel plate is further increased, which further deteriorates the quality of the edge of the steel plate. Strictly controlling the bulge on the narrow side of the continuous cast slab, especially making the narrow side of the continuous cast slab into 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 the utility model with patent number 201520673254.X and the invention patent with patent number 201610796688.8 disclosed a method for producing a slab with a narrow concave structure by using a crystallizer copper plate with a bump structure in the lateral center of the narrow working surface. The narrow copper plate of the crystallizer designed by these two patents has a lateral center of the working surface with a radius of 150-300 mm and a convex height of 5-12 mm, and the convex arc surface transitions to the base surface on both sides of the edge of the copper plate through the transition surface in contact with it. By using the narrow copper plate of the crystallizer with this structure, a narrow concave slab with a right angle structure can be produced, and the significant edge crack defects occurring in the rolling process of wide and thick slabs can be reduced to a certain extent. However, in this narrow copper plate, in order to smoothly transition between the convex arc surface in the width direction center and the base surfaces on both sides of it, the transition area needs to be designed to be wide, so the width of the arc-shaped convex surface in the width direction center of the narrow copper plate in the crystallizer becomes very narrow, and as a result, the convexity of the arc surface in the width direction center of the narrow copper plate is very concentrated, that is, the convex structure changes abruptly, and as a result, the narrow surface of the cast piece produced by this crystallizer is suddenly concave and changes, and the narrow surface of the cast piece is prone to forming a roughly "triangular" concave structure. In the rolling of wide-width thick slabs, when this shape is rolled, two-strand defects are easily formed at the edge of the middle slab. Especially when the aspect ratio is large, large folding defects are likely to occur at the edge of the steel plate.

[0006] Therefore, it is necessary to design a new narrow-surface 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-type 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; The second work surface is provided in two pieces, 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 a connection point between the first work surface and the second work surface is a first connection line, and two first connection lines are provided; The narrow-surface copper plate of a convex-arc-surface continuous casting crystallization apparatus is provided, in which the cross section of the first working surface is a convex arc-shaped line, the first working surface extends from an upper opening of the narrow-surface copper plate to a lower opening of the narrow-surface 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-surface copper plate toward the lower opening of the narrow-surface copper plate.

[0010] In another aspect, a method for using a narrow copper plate of a convex-shaped arc-shaped continuous casting crystallizer, comprising: forming a crystallizer with the narrow copper plate of the convex-shaped arc-shaped continuous casting crystallizer; The method for using the narrow-surface copper plate of a convex-type arc-surface continuous casting crystallizer is provided, in which cooling water is introduced into the cooling water tank of the narrow-surface copper plate during the working process of the crystallizer, the flow rate of the cooling water in the cooling water tank of the narrow-surface 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-surface copper plate is 5 to 9°C. Effect of the Invention

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

[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, resulting in the formation of 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 the continuous cast slab. [Brief description of the drawings]

[0013] In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings necessary for the description of 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 they can obtain other drawings based on these drawings without any creative efforts. [Figure 1] FIG. 2 is a schematic diagram of a mounting structure of a narrow-surface copper plate in a crystallizer according to an embodiment of the present application. [Diagram 2] 1 is a schematic diagram of the structure of a narrow-surface copper plate according to an embodiment of the present application. [Diagram 3] FIG. 2 is a schematic diagram of the side structure of the working surface on the lower opening side of the narrow copper plate according to one embodiment of the present application. [Figure 4] FIG. 2 is a schematic diagram showing the structure of the cooling surface of a narrow copper plate according to an embodiment of the present application; [Diagram 5] FIG. 2 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 are in contact in one embodiment of the present application. [Figure 6] FIG. 13 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 are in contact according to another embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Throughout the above drawings, a 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 concept in any way, but are intended to explain the present concept 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 labor 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 nouns such as "upper", "lower", and "side" in the examples of the present application do not limit the scope of protection of the present application.

[0017] In order 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 embodiment describes a narrow copper plate of a convex arc surface continuous casting crystallizer. The narrow copper plate 100 includes a working surface, the working surface includes a first working surface 1 and a second working surface, two second working surfaces are provided, one of the second working surfaces is provided on one side of the first working surface 1, the other of the second working surface is provided on the other side of the first working surface 1, the two second working surfaces are provided opposite each other, the first working surface 1 is connected to the two second working surfaces, the connection points between the first working surface 1 and the second working surface are first connection lines L1, two first connection lines L1 are provided, the cross section of the first working surface 1 is a convex arc line, the first working surface 1 extends from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate, and the convex height of the first working surface 1 with respect to the plane on which the two first connection lines L1 exist decreases 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 copper plates 200 and two narrow copper plates 100. In this embodiment, the crystallizer in which the narrow copper plate 100 exists is for continuously casting a narrow concave slab 300 having a right-angle structure with a thickness of 175-650 mm. As shown in FIG. 2, the upper opening 4 of the narrow copper plate is located at the upper end of the narrow copper plate 100, and the lower opening 5 of the narrow copper plate is located at the lower end of the narrow copper plate 100, and the working surface is the side that the solidified shell contacts, and the first working surface 1 is a convex arc surface and protrudes toward the cavity of the crystallizer. It is understood that the protruding height of the first working surface 1 with respect to the plane on which the two first connecting lines L1 exist refers to the distance that the first working surface 1 extends into the cavity of the crystallizer. The two second working surfaces are located on both sides of the first working surface 1, and the two second working surfaces are arranged symmetrically with respect to the vertical central axis plane of the first working surface 1. The vertical central axis planes of the two narrow copper plates 100 are the same plane. The connection points between the first working surface 1 and the second working surface are first connection lines L1, and the two second working surfaces form two first connection lines L1 with the first working surface 1, and the protruding height of the first working surface 1 with respect to the plane on which the two first connection lines L1 exist decreases from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow 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 surface are directly connected, so that 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, while the change in protrusion of the first work surface 1 is too large, forming an approximately "triangular" concave structure on the narrow surface of the slab, thereby reducing the probability of significant widthwise crack defects and significant two-strand defects occurring in the rolling process of the continuously cast slab.

[0021] Meanwhile, the provision of the second working surface gives the slab 300 a right-angle structure, thereby preventing the corners of the slab 300 from being too cold in the secondary cooling strand, and making it possible to control the lateral 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 present decreases from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate, so that the crystallizer using this narrow copper plate 100 can perform continuous casting with a larger taper, which makes the texture crystal grains at the corners of the slab 300 formed by solidification finer, reduces the occurrence of lateral cracks at the corners of the slab 300, and also greatly reduces the wear of the first working surface 1 in the area near the lower opening 5 of the narrow copper plate, 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 in 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 in 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 upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate are 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 surface 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, and the fourth length l4 is kept constant from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate. According to the thickness of the slab 300 produced by continuous casting, the fourth length l4 is 10-50 mm, and the thickness of the slab 300 refers to the direction indicated by the distance between the two wide copper plates 200, as shown in FIG.

[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 are connected, and the upper opening-side work surface 2 and the lower opening-side work surface 3 are 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 is a straight surface, and the lower opening-side work surface 3 is an inclined surface, and the lower opening-side work surface 3 is 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 connection line L1, the lower edge of the lower opening side work surface, and the upper edge of the lower opening side work surface, and 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 lower opening side work surface 3 is inclined 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 is inclined 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.

[0027] Further, as shown in Figures 2 and 3, the narrow copper plate 100 includes a cooling surface 6, which is arranged opposite the working surface, and a cooling water tank for cooling the continuous casting slab 300 is provided on the cooling surface 6, and the cooling surface 6 includes a side plane, which is arranged 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 arranged 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 apex 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 apex 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, 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 35-45 mm, and the eighth length l8 is 0.25-4 mm. Furthermore, in general, the value of the eighth length l8 is equal to or greater than the difference between the first length l1 of the upper opening and the first length 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 connection line L1, the lower edge of the upper opening side working surface, and the upper edge of the upper opening side working surface, 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, 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, the outer edge of the upper opening side working surface is an edge that is arranged parallel to and opposite the first connection 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 are in contact at the first end point O1.

[0030] It is further understood that the second working surface includes an upper opening side working surface 2 and a lower opening side working surface 3, the lower opening side working surface 3 includes an outer edge portion L2 of the lower opening side working surface, the upper opening side working surface 2 includes an outer edge portion of the upper opening side working surface, and the outer edge portion of the upper opening side working surface and the outer edge portion L2 of the lower opening side working surface are in contact to form the outer edge portion of the second working surface. The distance between the outer edge portion of the second working surface and the first connecting line L1 is a fourth length l4, and the fourth length l4 is kept constant from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate. It is understood that the widthwise distance of the narrow copper plate 100 between the two first connecting lines L1 decreases linearly from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate, and the widthwise distance of the narrow copper plate 100 between the two first connecting lines L1 in the plane of the upper opening 4 of the narrow copper plate is 1 to 4 mm longer than the widthwise distance of the narrow copper plate 100 between the two first connecting lines L1 in 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 for the solidification of the slab 300 by the lower opening of the crystallizer, further reducing the wear of the lower opening 5 of the narrow copper plate by the slab 300 when manufacturing the slab 300, and 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 FIG. 4, FIG. 5 and FIG. 6, the narrow copper plate 100 includes a fastening hole 7, a first cooling water tank 8 and a second cooling water tank 9, the fastening holes 7 are arranged in a plurality of rows, the plurality of rows of fastening holes 7 are arranged symmetrically with respect to the vertical central axis plane of the narrow copper plate 100, the first cooling water tank 8 and the second cooling water tank 9 are arranged between the two adjacent rows of fastening holes 7, two first cooling water tanks 8 are provided, and a plurality of second cooling water tanks 9 are provided, and the first cooling water tank 8 and the second cooling water tank 9 are both extended in the height direction of the narrow copper plate 100. The two first cooling water tanks 8 are respectively arranged adjacent to the two rows of fastening holes 7, and the plurality of second cooling water tanks 9 are located between the two first cooling water tanks 8, the bottom of the first cooling water tank 8 is closer to the first working surface 1 than the bottom of the adjacent second cooling water tank 9, and the bottoms of the plurality of second cooling water tanks 9 are on the same arc surface.

[0033] Further, 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 tilted 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, and 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 fix the narrow 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 tilted water tank 10 are evenly distributed in the width direction of the narrow copper plate 100, and the first cooling water tank 8, the second cooling water tank 9, and the tilted water tank 10 have the same width. As shown in FIG. 5 and FIG. 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 connection lines L1 exist, and the tilted water tank 10 is recessed at an angle toward the center of the second working surface. In this embodiment, when the tilting water tank 10 is tilted 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 is 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 over 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 tangent becomes a 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 vertically translated by 20 to 30 mm from the reference convex arc line L3 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 inclined water tank 10 allow heat to be transferred uniformly in the width direction of the narrow copper plate 100 of the crystallizer.

[0040] In this embodiment, the crystallizer is further disclosed using the narrow copper plate 100 of the above-mentioned convex arc surface continuous casting crystallizer. When arranging two narrow copper plates 100, the distance between the upper opening 4 of the narrow copper plate of the two narrow copper plates 100 is made larger than the distance between the lower opening 5 of the narrow copper plate of the two narrow copper plates 100, so that the crystallizer is structured such that the upper part is wide and the lower part is narrow, and a predetermined reverse taper is given to the crystallizer, and the reverse taper of the crystallizer is 1.05% to 1.35%.

[0041] In this embodiment, the use method of the narrow-surface 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-surface copper plate 100, the amount of cooling water of the narrow-surface copper plate 100 varies according to the structure of the water tank, the flow rate of the cooling water in the cooling water tank of the narrow-surface copper plate 100 is 6m / 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-surface copper plate 100 is 5-9℃.

[0042] The cooling water tanks for 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 it is understood that the amount of cooling water varies depending on the structure of the water tank, the flow rate of the cooling water in the cooling water tank for 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 also providing the first working surface 1 and the second working surface, a narrow concave slab 300 with a right-angle structure can be manufactured, and the width of the edge crack can be limited to 20 mm from the edge in the process of rolling a medium-thickness slab or a wide-thickness slab from a cast piece, and the corner temperature in the process of solidifying the slab 300 in the secondary cooling strand can be ensured to be close to the corner temperature of the conventional right-angle continuous casting slab 300, so that the probability of the occurrence of corner cracks in the slab 300 can be reduced. The slab 300 manufactured using the narrow copper plate 100 of this embodiment has a wide and large concave arc-shaped structure in the lateral center of the narrow surface, thereby avoiding the folding defects of the narrow surface caused by the rolling of the concave slab with the disclosed severe transition. In this embodiment, the wear wear at the lower opening 5 of the narrow copper plate is reduced, so that the service life of the narrow copper plate 100 is significantly extended. By continuously casting the slab 300 using the narrow surface copper plate 100 of this embodiment, it becomes possible to perform continuous casting by increasing the taper of the narrow surface of the crystallizer. Example 2

[0044] The narrow copper plate 100 with a convex arc surface for a crystallizer for continuously casting a slab 300 with a thickness of 300 mm 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 in length between the fifth length l5 and the sixth length l6 is 2 mm. As shown in FIG. 2, the width of the narrow copper plate 100 decreases linearly from the fifth length l5 to the sixth length l6 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 working surface on the side in contact with the solidified shell and a cooling surface 6 with a cooling water tank facing the working surface. The working surface of the narrow copper plate 100 is divided into a second working surface on both sides in the width direction and a first working surface 1 in the center. The connection line between the second working surfaces on both sides and the first working surface 1 in the center is a first connection line L1. Here, as shown in FIG. 2, in the height direction of the narrow copper plate 100, the second working surface is divided into an upper opening side working surface 2 and a lower opening side working surface 3. Both the upper opening side working surface 2 and the lower opening side working surface 3 on both sides are symmetrically arranged with the vertical central axis plane of the narrow copper plate 100 as a line of symmetry.

[0046] As shown in FIG. 2, the upper opening side working surface 2 has four sides including the outer edge of the upper opening side working surface, the first connection line L1, the lower edge of the upper opening side working surface, and the upper edge of the upper opening side working surface. 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, 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 provided in parallel and opposite to the first connection line L1. The distance between the outer edge of the upper opening side working surface and the first connection line L1 is the fourth length l4, and the fourth length l4 is 30 mm.

[0047] The lower opening side working surface 3 has four sides including the outer edge L2 of the lower opening side working surface, the first connecting line L1, the lower edge of the lower opening side working surface, and the upper edge of the lower opening side working surface. The lower edge of the lower opening side working surface is the intersection line between the lower opening side working surface 3 and the lower opening 5 of the narrow copper plate, and the upper edge of the lower opening side working surface is the intersection line between the lower opening side working surface 3 and the upper opening side working surface 2. The distance between the outer edge L2 of the lower opening side working surface and the first connecting line L1 is the 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 are in contact with each other at a first end point O1.

[0049] 2, the upper opening side working surface 2 is 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 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 copper plate to the lower opening side working surface 3, which is 450 mm.

[0050] As shown in Figures 2 and 3, the narrow copper plate 100 includes a cooling surface 6, the cooling surface 6 and the working surface are arranged opposite each other, a cooling water tank for cooling the continuous casting slab 300 is provided on the cooling surface 6, the cooling surface 6 includes a side plane, the side plane is arranged opposite to the second working surface, and the side plane and the upper opening side working surface 2 are arranged parallel to each other, the lower opening side working surface 3 includes a first vertex O2, the first vertex O2 is on the connection line between the lower opening side working surface 3 and the lower opening 5 of the narrow copper plate, and the first vertex O2 is arranged flowing 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. It is understood that 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, the third length l3 is 40 mm and the eighth length l8 is 0.5 mm.

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

[0052] The first working surface 1 is a convex arc surface and protrudes toward the cavity of the crystallizer. The two second working surfaces are on both sides of the first working surface 1, and the two second working surfaces are arranged symmetrically with respect to the vertical central axis plane of the first working surface 1. It is understood that the vertical central axis planes of the two narrow copper plates 100 are the same plane. The connection point between the first working surface 1 and the second working surface is the first connection line L1, and the two second working surfaces form two first connection lines L1 with the first working surface 1, and the protruding height of the first working surface 1 with respect to the plane on which the two first connection lines L1 exist decreases from the upper opening 4 of the narrow copper plate to the lower opening 5 of the narrow copper plate. In 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 circular arc surface in the center. As shown in FIG. 6, in another embodiment, the cooling surface 6 includes two side planes and a plane in the center. In this embodiment, the cooling surface 6 having a planar structure shown in FIG. 6 will be described with emphasis. The cooling surface 6 has three rows of fastening holes 7 arranged in the width direction to fix the narrow copper plate 100 to the stainless steel back plate of the crystallizer. In the width direction of the narrow copper plate 100, a first cooling water tank 8 and a second cooling water tank 9 are evenly arranged between any two rows of fastening holes 7, which have the same width and are perpendicular to the plane on which the two first connection lines L1 exist. As shown in FIG. 5, a tilted water tank 10 is provided on each edge on both sides of the cooling surface 6, and the tilted water tank 10 is tilted toward the center of the second working surface, and the angle between the axis of the tilted water tank 10 and the upper opening side working surface 2 is θ1, and θ1 is 75°.

[0054] 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. The cross section of the first working surface 1 in the plane where the upper opening side working surface 2 and the lower opening side working surface 3 are in contact is the reference convex arc line L3, the convex arc line of the cross section of the same arc surface of the bottoms of the second cooling water tanks 9 is L4, and the convex arc line L4 of the cross section of the arc surface where the bottoms 11 of the second cooling water tanks 9 exist is set 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 second cooling water tanks 9 exist is vertically translated by 20 mm toward the cooling surface 6 from the reference convex arc line L3.

[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, and in this embodiment, the ninth length l9 is 1.5 mm. This allows heat to be uniformly transferred across the width of the copper plate of the crystallizer.

[0056] In this embodiment, the crystallizer is further disclosed using the narrow copper plate 100 of the above-mentioned convex arc surface continuous casting crystallizer. When arranging two narrow copper plates 100, the distance between the upper opening 4 of the narrow copper plate of the two narrow copper plates 100 is made larger than the distance between the lower opening 5 of the narrow copper plate of the two narrow copper plates 100, so that the crystallizer is structured such that the upper part is wide and the lower part is narrow, and a predetermined reverse taper is given to the crystallizer, and the reverse taper of the crystallizer is 1.05% to 1.35%.

[0057] In this embodiment, the use method of the narrow-surface 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-surface copper plate 100, the amount of cooling water of the narrow-surface copper plate 100 varies according to the structure of the water tank, the flow rate of the cooling water in the cooling water tank of the narrow-surface copper plate 100 is 6m / 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-surface copper plate 100 is 5-9℃.

[0058] In this application, 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 be readily apparent to those skilled in the art after practicing the present application as disclosed herein and in the specification. The present application is intended to cover any variations, uses or adaptations of the present application, which variations, uses or adaptations follow the general principles of the present application and include common sense or customary techniques known in the art that are not disclosed herein. The present specification and examples are intended to be merely illustrative.

[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-First 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 on which the bottoms of the multiple second cooling water tanks exist l1 - First length of upper opening l2 - second length l3 - 3rd length l4 - 4th length l5 - 5th length l6 - 6th length l7 - 7th length l8 - 8th length l9 - 9th length O1-1st endpoint O2-First apex 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 including a working surface, the working surface including a first working surface and a second working surface; The second work surface is provided in two pieces, 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 a connection point between the first work surface and the second work surface is a first connection line, and two first connection lines are provided; A narrow copper plate of a convex arc surface continuous casting crystallization apparatus, wherein the cross section of 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.

2. The plane in which the upper opening of the narrow copper plate exists is parallel to the plane in which the lower opening of the narrow copper plate exists; The maximum vertical distance between the first working surface and the plane in which the two first connecting lines exist in the plane in which the upper opening of the narrow copper plate exists is the first length of the upper opening; The maximum vertical distance between the first working surface and the plane in which the two first connecting lines exist in the plane in which the lower opening of the narrow copper plate exists is the first length of the lower opening; The narrow copper plate of the convex arc-surface continuous casting crystallization apparatus according to claim 1, wherein the vertical distance between the plane where the upper opening of the narrow copper plate exists and the plane where the lower opening of the narrow copper plate exists is 780 to 1200 mm, and the difference between the first length of the upper opening and the first length of the lower opening is 0.2 to 4 mm.

3. The narrow copper plate of the convex arc surface continuous casting and crystallization apparatus according to claim 2, 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.

4. 2. The narrow copper plate of the convex arc-surface continuous casting and crystallization apparatus according to claim 1, wherein the second working surface extends from the upper opening of the narrow copper plate to the lower opening of the narrow copper plate, and the distance between the outer edge of the second working surface and the first connecting line is kept constant from the upper opening of the narrow copper plate to the lower opening of the narrow copper plate.

5. The second work surface includes 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, and the upper opening side work surface and the lower opening side work surface are sequentially arranged from the upper opening of the narrow copper plate to the lower opening of the narrow copper plate, The narrow copper plate of the convex-shaped arc-surface continuous casting crystallization apparatus according to claim 1, wherein the upper opening side work surface is a straight surface, the lower opening side work surface is an inclined surface, and the direction of the lower opening side work surface is inclined in a direction opposite to the convex direction of the first work surface.

6. The narrow copper plate includes a cooling surface, the cooling surface includes a side plane, the side plane is provided opposite to the second work surface, and the side plane and the upper opening side work surface are provided 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; The narrow copper plate of the convex arc surface continuous casting crystallizer according to claim 5, 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.

7. 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 copper plate of the convex arc-surface continuous casting crystallizer according to claim 5, wherein the second length is 25% to 75% of the vertical distance between the plane where the upper opening of the narrow copper plate is located and the plane where the lower opening of the narrow copper plate is located.

8. 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, respectively, 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.

9. 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 with each other is a reference convex arc line; The narrow copper plate of the convex arc surface continuous casting crystallization apparatus described in claim 8, 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 to be parallel to the reference convex arc line.

10. A method for using the narrow copper plate of a convex arc-shaped continuous casting crystallizer, comprising: forming a crystallizer using the narrow copper plate of the convex arc-shaped continuous casting crystallizer according to any one of claims 1 to 9; The method for using the narrow copper plate of the convex arc surface continuous casting crystallizer, wherein during the working process 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 6m / 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 5-9°C.

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