Thin slab continuous casting crystallizer narrow-face copper plate

Abstract

The utility model provides a narrow-face copper plate of a thin slab continuous casting crystallizer, which comprises a rectangular body part, and a wedge body part is convexly arranged on the rectangular body part; the largest face of the narrow-face copper plate is a first face, the narrow-face copper plate makes contact with molten steel on the first face, the first face is a folded face and comprises a parallel face parallel to the opposite side and an inclined face, and the largest face of the wedge body part is the inclined face. The narrow-face copper plate of the thin slab continuous casting crystallizer is excellent in effect when being applied to thin slab continuous casting, the service life of the copper plate of the thin slab continuous casting crystallizer is greatly prolonged, the effect is remarkable, and the narrow-face copper plate is worthy of popularization.

Description

Technical Field

[0001] The utility model belongs to the field of continuous casting equipment, and in particular relates to a narrow copper plate of a thin slab continuous casting crystallizer. Background Art

[0002] The casting speed of thin slab continuous casting is high, and a large amount of heat from the molten steel in the crystallizer is quickly discharged in a short time and forms a shell of a certain thickness at the crystallizer outlet. This requires the copper plate to have excellent thermal conductivity, so the surface of the copper plate of the thin slab continuous casting crystallizer is usually not coated.

[0003] Compared with the coated conventional slab crystallizer copper plate, the thin slab continuous casting copper plate is more susceptible to wear when in constant friction with the ingot, resulting in a larger amount of milling each time it goes offline. Usually, after 4-5 times of milling, the thin slab continuous casting copper plate will be scrapped because the effective working thickness is too thin, which greatly reduces the service life of the narrow copper plate.

[0004] However, there is no copper plate with a long service life that can be applied to thin slab continuous casting in common technology. Utility Model Content

[0005] Aiming to solve the technical problem of short service life of copper plates for thin slab continuous casting in the above-mentioned common technologies, the utility model provides a thin slab continuous casting crystallizer narrow copper plate, comprising a rectangular body, wherein one end of the rectangular body in the height direction protrudes with a wedge body;

[0006] The largest surface of the narrow copper plate is the first surface, and the narrow copper plate contacts the molten steel at the first surface. The first surface is a folded surface, including a parallel surface parallel to the opposite side and an inclined surface, and the largest surface of the wedge body is the inclined surface.

[0007] Furthermore, the wedge portion protrudes from the long height surface of the rectangular portion.

[0008] Furthermore, the wedge portion and the rectangular portion have the same length.

[0009] Furthermore, the height of the parallel surface is 300-350 mm, and the height of the inclined surface is 800-850 mm.

[0010] Furthermore, the length of the rectangular body is 60 to 90 mm, and the width of the rectangular body is 13 to 20 mm.

[0011] Furthermore, the wedge portion and the rectangular portion are coplanar with each other on an extension surface of the parallel surface.

[0012] Furthermore, the end surface of the wedge portion away from the parallel surface is the second surface, the end surface of the rectangular portion away from the parallel surface is the third surface, and the second surface is located on the extension surface of the third surface.

[0013] Furthermore, the width of the second surface is 2-3.5 mm.

[0014] Furthermore, an intersection line between the parallel surface and the inclined surface is parallel to the third surface.

[0015] Compared with the commonly used technology, the utility model has the following advantages:

[0016] In common technologies, copper plates used in thin slab continuous casting are severely worn and need to be replaced frequently as consumables, especially the bottom of the copper plate. Excessive wear often leads to large offline milling. After 4-5 millings, the copper plate will be scrapped because the effective working thickness is too thin. Among them, the reasons for the more severe friction and cracking of the bottom of the copper plate include the following:

[0017] During the continuous casting process, the molten steel initially cools and solidifies in the crystallizer. By the time it reaches the bottom of the crystallizer, a solid shell of a certain thickness has been formed. The shell has a certain strength and hardness. During the continuous billet drawing process, the initial solidified shell constantly rubs against the copper plate, and the crystallizer is usually provided with a certain inverted taper, that is, the closer to the bottom of the crystallizer, the closer the contact between the billet and the narrow copper plate is, the greater the friction generated, resulting in severe wear on the bottom.

[0018] On the other hand, the vibration mode of the continuous casting machine will also affect the wear of the copper plate. During the continuous casting process, the crystallizer needs to vibrate continuously to facilitate the smooth pulling of the billet. However, this vibration will also increase the friction between the copper plate and the billet, especially in the bottom area, where the wear will be more obvious due to the vibration force.

[0019] Finally, the use of cooling water will also affect the wear of the copper plate. If the cooling water quality is poor or the water pressure is too high, it may cause erosion and corrosion of the copper plate, aggravating the wear of the bottom.

[0020] In particular, the narrow copper plate of the utility model is used for thin slab continuous casting. Based on the requirement of high thermal conductivity, no coating is provided on the surface of the narrow copper plate, and the wear is more serious than that of the conventional slab crystallizer copper plate with coating.

[0021] Based on the above, the narrow copper plate provided by the utility model has a wedge portion protruding in the height direction, and the width of the end where the wedge portion is located is greater than the width of the end where the rectangular portion is located. The end where the wedge portion is located is used as the bottom and the end where the rectangular portion is located is used as the top in the crystallizer, so that the thicker part of the copper plate can bear the more intense friction force of the bottom of the copper plate during the continuous casting process, and the amount of milling at the local weak part is increased, so that the service life of the copper plate of the thin slab continuous casting crystallizer is greatly improved.

[0022] Moreover, the narrow copper plate of the thin slab continuous casting crystallizer produced by the utility model has excellent effect when used for thin slab continuous casting, and the influence of increased thickness on the quality of the cast billet can be ignored: the width-to-thickness ratio of the thin slab is large, and the heat of the molten steel during cooling and solidification in the crystallizer is mainly transferred on the wide surface, and the heat transfer of the narrow surface is very small, and the heat is mainly transferred to the upper part of the narrow surface. Because the upper part is directly in contact with the high-temperature molten steel, and a billet shell has been formed in the lower part, the heat transfer is reduced. Therefore, slightly increasing the effective working thickness of the middle and lower area of ​​the narrow copper plate has little effect on the heat transfer and solidification of the slab in the crystallizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a schematic structural diagram of the copper plate of the thin slab continuous casting crystallizer in one embodiment of the utility model.

[0025] Figure 2 It is a schematic structural diagram of the copper plate of the thin slab continuous casting crystallizer in one embodiment of the utility model.

[0026] Figure 3 It is a schematic structural diagram of the copper plate of the thin slab continuous casting crystallizer in one embodiment of the utility model.

[0027] Figure 4 It is a schematic structural diagram of the copper plate of the thin slab continuous casting crystallizer in one embodiment of the utility model.

[0028] Figure 5 It is a schematic structural diagram of the copper plate of the thin slab continuous casting crystallizer in one embodiment of the utility model.

[0029] Description of the drawings: 1. Parallel surface; 2. Inclined surface; 3. Second surface; 4. Third surface; 5. Rectangular body; 6. Wedge body. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Furthermore, the technical solutions between the various implementation modes of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] When numerical ranges are given in the embodiments, it should be understood that unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are in accordance with the prior art mastery of those skilled in the art and the description of the present invention, and any prior art methods, equipment and materials similar or equivalent to the methods, equipment and materials in the embodiments of the present invention can also be used to implement the present invention.

[0033] like Figure 1 As shown, the utility model provides a thin slab continuous casting crystallizer narrow copper plate, comprising a rectangular body 5, wherein the rectangular body 5 is convexly provided with a wedge body 6;

[0034] like Figure 2 , Figure 3 As shown, the largest surface of the narrow copper plate is the first surface, and the narrow copper plate contacts the molten steel at the first surface. The first surface is a folded surface, including a parallel surface 1 and an inclined surface 2 parallel to the opposite side, and the largest surface of the wedge portion 6 is the inclined surface 2.

[0035] like Figure 4 The rectangular portion shown is composed of a first block and a second block, which are arranged in sequence up and down and formed as one piece; the wedge-shaped portion is formed by the protrusion of the second block and just covers the second block (that is, the wedge-shaped portion covers the surface of the second block facing the wedge-shaped portion).

[0036] The angle between the inclined surface and the parallel surface is the inverted taper, and the inverted taper can be 0.15°-0.25°. The intersection of the inclined surface and the parallel surface has a smooth transition.

[0037] In some embodiments, the narrow copper plate has a width of 60-90 mm and an effective working thickness of 13-20 mm.

[0038] In other embodiments, the ratio of the width to the thickness of the slab cast using the narrow copper plate is 10:1 to 23:1.

[0039] like Figure 5 As shown, the wedge portion 6 protrudes from the long height surface of the rectangular portion 5 .

[0040] It should be noted that the utility model limits the direction of the narrow copper plate by the length, width and height (the height of the narrow copper plate is greater than the length and greater than the width), wherein the direction of the parallel plane 1 is parallel to the plane formed by the length direction and the height direction of the narrow copper plate, and the second plane 3 and the third plane 4 are parallel to the plane formed by the length direction and the width direction of the narrow copper plate.

[0041] The wedge portion 6 has the same length as the rectangular portion 5 .

[0042] In some embodiments, the height of the parallel surface 1 is limited to 300-350 mm, and the height of the inclined surface 2 is limited to 800-850 mm, so as to accurately alleviate the wear of the copper plate in the commonly used technology: in actual production, the narrow copper plate starts to wear more severely from about 350 mm at the top, and the wear becomes more serious towards the bottom.

[0043] In some embodiments, the length of the rectangular body 5 is 60-90 mm, and the width of the rectangular body 5 is 13-20 mm.

[0044] The wedge portion 6 and the rectangular portion 5 are coplanar with each other on the extended surface of the parallel surface 1 .

[0045] The end surface of the wedge portion 6 away from the parallel surface 1 is the second surface 3 , the end surface of the rectangular portion 5 away from the parallel surface 1 is the third surface 4 , and the second surface 3 is located on the extension surface of the third surface 4 .

[0046] The width of the second surface 3 is 2-3.5 mm.

[0047] The intersection line between the parallel surface 1 and the inclined surface 2 is parallel to the third surface 4 .

[0048] Compared with the commonly used technology, the utility model has the following advantages:

[0049] In common technologies, copper plates used in thin slab continuous casting are severely worn and need to be replaced frequently as consumables, especially the bottom of the copper plate. Excessive wear often leads to large offline milling. After 4-5 millings, the copper plate will be scrapped because the effective working thickness is too thin. Among them, the reasons for the more severe friction and cracking of the bottom of the copper plate include the following:

[0050] During the continuous casting process, the molten steel initially cools and solidifies in the crystallizer. By the time it reaches the bottom of the crystallizer, a solid shell of a certain thickness has been formed. The shell has a certain strength and hardness. During the continuous billet drawing process, the initial solidified shell constantly rubs against the copper plate, and the crystallizer is usually provided with a certain inverted taper, that is, the closer to the bottom of the crystallizer, the closer the contact between the billet and the narrow copper plate is, the greater the friction generated, resulting in severe wear on the bottom.

[0051] On the other hand, the vibration mode of the continuous casting machine will also affect the wear of the copper plate. During the continuous casting process, the crystallizer needs to vibrate continuously to facilitate the smooth pulling of the billet. However, this vibration will also increase the friction between the copper plate and the billet, especially in the bottom area, where the wear will be more obvious due to the vibration force.

[0052] Finally, the use of cooling water will also affect the wear of the copper plate. If the cooling water quality is poor or the water pressure is too high, it may cause erosion and corrosion of the copper plate, aggravating the wear of the bottom.

[0053] In particular, the narrow copper plate of the utility model is used for thin slab continuous casting. Based on the requirement of high thermal conductivity, no coating is provided on the surface of the narrow copper plate, and the wear is more serious than that of the conventional slab crystallizer copper plate with coating.

[0054] Based on the above, the narrow copper plate provided by the utility model has a wedge portion 6 protruding in the height direction, and the width of the end where the wedge portion 6 is located is greater than the width of the end where the rectangular portion 5 is located. The end where the wedge portion 6 is located is used as the bottom, and the end where the rectangular portion 5 is located is used as the top in the crystallizer, so that the thicker part of the copper plate can bear the more intense friction force of the bottom of the copper plate during the continuous casting process, and the amount of milling at the local weak part is increased, so that the service life of the copper plate of the thin slab continuous casting crystallizer is greatly improved.

[0055] Moreover, the narrow copper plate of the thin slab continuous casting crystallizer produced by the utility model has excellent effect when used for thin slab continuous casting, and the influence of increased thickness on the quality of the cast billet can be ignored: the width-to-thickness ratio of the thin slab is large, and the heat of the molten steel during cooling and solidification in the crystallizer is mainly transferred on the wide surface, and the heat transfer of the narrow surface is very small, and the heat is mainly transferred to the upper part of the narrow surface. Because the upper part is directly in contact with the high-temperature molten steel, and a billet shell has been formed in the lower part, the heat transfer is reduced. Therefore, slightly increasing the effective working thickness of the middle and lower area of ​​the narrow copper plate has little effect on the heat transfer and solidification of the slab in the crystallizer.

[0056] In order to facilitate the technical personnel in the field to further understand the present invention, the following examples are given:

[0057] The narrow copper plate of the thin slab continuous casting crystallizer produced by the utility model is applied to the crystallizer, and the first surface contacts with the molten steel. The molten steel flows from the parallel surface 1 to the inclined surface 2 and enters the cooling area. The wedge portion 6 bears the larger friction force at the bottom to improve the service life of the narrow copper plate of the thin slab continuous casting crystallizer.

[0058] According to the thickness of the narrow copper plate, the taper of the crystallizer is adjusted as follows:

[0059] When the thickness of the rectangular portion 5 of the narrow copper plate is 16-20 mm, the taper of the crystallizer is reduced by 30% based on the normal taper, and the inverted taper of the lower part of the narrow copper plate is maintained during offline milling; wherein the inverted taper is the angle between the parallel surface 1 and the inclined surface 2.

[0060] When the thickness of the narrow copper plate is 13-16mm, the inverted taper part of the lower part of the narrow copper plate is milled off during offline milling, so that the working surface of the entire narrow copper plate is a plane, and the taper of the crystallizer is set according to the normal taper when pouring molten steel.

[0061] The thickness of the narrow copper plate is relatively thick in the early stage of use, and the heat deformation resistance is relatively strong when pouring high-temperature liquid steel. The copper plate is relatively thin in the later stage of use, that is, when the thickness is 13-16mm, the heat transfer efficiency is higher, so that the hot surface temperature of the copper plate is also higher, resulting in cracks at the slag line of the copper plate, thereby greatly increasing the single offline milling amount. The number of furnaces poured in the later stage of use of the copper plate is about 50% of that in the early stage, so the utility model is more meaningful for increasing the service life of the narrow copper plate in the early stage of use.

[0062] In addition, when the thickness of the rectangular portion 5 of the narrow copper plate is 16-20 mm, the middle and lower parts of the narrow copper plate already have a certain inverted taper. Therefore, during casting, the taper setting of the crystallizer should be reduced by 30% based on the normal taper to prevent the taper from being too large, causing more serious wear on the lower part of the copper plate.

[0063] The above technical solutions of the present invention are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A thin slab continuous casting crystallizer narrow copper plate, characterized in that: It comprises a rectangular body portion, wherein a wedge portion is convexly provided on the rectangular body portion; The largest surface of the narrow copper plate is the first surface, and the narrow copper plate contacts the molten steel at the first surface. The first surface is a folded surface, including a parallel surface parallel to the opposite side and an inclined surface, and the largest surface of the wedge body is the inclined surface.

2. The thin slab continuous casting mold narrow copper plate according to claim 1, characterized in that: The wedge body portion protrudes from the long height surface of the rectangular body portion.

3. The thin slab continuous casting crystallizer narrow copper plate according to claim 1, characterized in that: The wedge body portion and the rectangular body portion have the same length.

4. The thin slab continuous casting crystallizer narrow copper plate according to claim 1, characterized in that: The height of the parallel surface is 300-350 mm, and the height of the inclined surface is 800-850 mm.

5. The thin slab continuous casting crystallizer narrow copper plate according to claim 1, characterized in that: The length of the rectangular body is 60-90 mm, and the width of the rectangular body is 13-20 mm.

6. The thin slab continuous casting mold narrow copper plate according to claim 1, characterized in that: The wedge portion and the rectangular portion are coplanar with each other on an extended surface of the parallel surface.

7. The thin slab continuous casting crystallizer narrow copper plate according to claim 1, characterized in that: The end surface of the wedge portion away from the parallel surface is a second surface, the end surface of the rectangular portion away from the parallel surface is a third surface, and the second surface is located on an extension surface of the third surface.

8. The thin slab continuous casting mold narrow copper plate according to claim 7, characterized in that: The width of the second surface is 2-3.5 mm.

9. The thin slab continuous casting crystallizer narrow copper plate according to claim 7, characterized in that: An intersection line between the parallel surface and the inclined surface is parallel to the third surface.

Images