Continuous casting tundish for improving flow field

Abstract

The invention relates to the technical field of continuous cast steel pouring, and provides a continuous casting tundish for improving a flow field, a plurality of turbulent flow controller steel through holes are horizontally formed in a turbulent flow controller, one end of each turbulent flow controller steel through hole is communicated with the interior of the turbulent flow controller, and the other end of each turbulent flow controller steel through hole is located on the outer side face of the turbulent flow controller; a plurality of dam body steel through holes are horizontally formed in the dam, one end of each dam body steel through hole is located on the side, close to the long nozzle, of the dam, and the other end of each dam body steel through hole is located on the side, away from the long nozzle, of the dam; a plurality of weir body steel through holes are horizontally formed in the weir, one end of each weir body steel through hole is located on the side, close to the long nozzle, of the weir, and the other end of each weir body steel through hole is located on the side, away from the long nozzle, of the weir; the top end of the side, close to the long nozzle, of the dam is provided with an inclined face inclining towards the long nozzle. By means of the method, the dead zone area can be reduced, the phenomenon that molten steel surges upwards is avoided, and slag entrapment of the molten steel at the position is avoided, so that the slag inclusion defect of steel is reduced, and the yield of the molten steel is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous steel casting, and in particular to a continuous casting tundish with improved flow field. Background Art

[0002] The continuous casting tundish is the last metallurgical container before the molten steel enters the mold. Its function is more than just a traditional steel distributor; more importantly, it facilitates the removal of inclusions, thereby improving the purity of the molten steel. Dead zones in the flow field within the tundish hinder the removal of inclusions and the uniformity of the molten steel temperature, compromising the quality of the ingots.

[0003] like Figure 1 The problem of dead zones in the flow field of the conventional continuous casting tundish has not yet been effectively addressed. Numerous attempts have been made to address this issue, but none have yielded significant results. Therefore, a continuous casting tundish that can minimize these dead zones is urgently needed. Summary of the Invention

[0004] In response to the technical problems raised above, a continuous casting tundish with improved flow field is provided.

[0005] The technical means adopted in the present invention are as follows: A continuous casting tundish for improving the flow field, comprising a tundish shell and a long water outlet; a turbulence controller for receiving molten steel flowing out of the long water outlet is provided in the tundish shell, the opening of the turbulence controller faces upward and is located directly below the input port of the tundish shell; a dam and an weir are also provided in the tundish shell; a plurality of turbulence controller steel through holes are horizontally opened on the turbulence controller, one end of the turbulence controller steel through hole is connected to the inside of the turbulence controller, and the other end of the turbulence controller steel through hole is located on the outer surface of the turbulence controller; a plurality of dam body steel through holes are horizontally opened on the dam, one end of the dam body steel through hole is located on the side of the dam close to the long water outlet, and the other end of the dam body steel through hole is located on the side of the dam away from the long water outlet; a plurality of weir body steel through holes are horizontally opened on the weir, one end of the weir body steel through hole is located on the side of the weir close to the long water outlet, and the other end of the weir body steel through hole is located on the side of the weir away from the long water outlet.

[0006] Furthermore, the vertical distance between the top side and the bottom side of the turbulence controller steel hole is set as the first spacing, the height difference between the axis of the turbulence controller steel hole and the bottom surface of the turbulence controller is set as the first height difference, and the value range of the first spacing is 15~30 mm.

[0007] Furthermore, a plurality of turbulence controller steel holes are horizontally opened on both sides of the turbulence controller, and the plurality of turbulence controller steel holes on the same side of the turbulence controller are equidistantly distributed; the horizontal distance between the axes of two adjacent turbulence controller steel holes on the same side of the turbulence controller is set as the first hole spacing, and the value range of the first hole spacing is 50~150 mm.

[0008] Furthermore, the vertical distance between the top and bottom sides of the dam body steel hole is set as a second spacing, and the value range of the second spacing is 15~30 mm; the height difference between the covering agent in the intermediate ladle shell and the axis of the dam body steel hole is set as a second height difference, and the value range of the second height difference is 30~100 mm.

[0009] Furthermore, the plurality of dam body through-steel holes are distributed at equal intervals; the horizontal distance between two adjacent dam body through-steel holes is set as a second hole spacing, and the value range of the second hole spacing is 100-300 mm.

[0010] Furthermore, the vertical distance between the top side and the bottom side of the steel hole in the dam body is set as a third spacing, and the height difference between the axis of the steel hole in the dam body and the bottom end of the dam is set as a third height difference. The value range of the third spacing is 15~30 mm, and the value range of the third height difference is 30~100 mm.

[0011] Furthermore, the plurality of weir body through-steel holes are distributed at equal intervals; the horizontal distance between two adjacent weir body through-steel holes is set as a third hole spacing, and the value range of the third hole spacing is 100-300 mm.

[0012] Furthermore, a slope inclined toward the long shroud is provided on the top of the dam on the side close to the long shroud; the angle at which the slope inclined toward the long shroud is set as the slope inclination angle, and the value range of the slope inclination angle is 30°~45°.

[0013] Furthermore, a height difference between the covering agent in the tundish shell and the bottom end of the inclined surface is set as a fourth height difference, and a value range of the fourth height difference is 150-400 mm.

[0014] Compared with the prior art, the present invention has the following advantages: In the present invention, molten steel is injected into the turbulence controller through the long shroud, then flows from the turbulence controller to the tundish liquid surface. After being blocked by the dam, it turns downward and flows through the dam bottom. It is then guided upward by the weir to flow over the weir top and finally into the mold through the tundish upper shroud. During this process, molten steel flows through the turbulence controller steel holes, the dam body steel holes, and the weir body steel holes, thereby reducing the dead zone area.

[0015] 2. In the present invention, molten steel is injected into the turbulence controller from the long nozzle, and then flows toward the liquid surface of the tundish from the turbulence controller. Part of the molten steel flows toward the dam along the liquid surface. After the molten steel hits the inclined surface, it will all turn back and flow downward, avoiding the occurrence of the molten steel surging upward, thereby preventing the molten steel from being exposed to air absorption or generating slag curling, which will further pollute the molten steel.

[0016] 3. In the present invention, after the pouring is completed, the liquid level of the molten steel continues to decrease and drops to the bottom surface of the residual steel overflow hole. At this time, the molten steel between the two weirs of the tundish no longer flows out to become residual steel. Most of the residual steel in the turbulence controller and between the two weirs will flow out from the steel holes of the weir body and then be injected into the crystallizer through the upper water inlet of the tundish, thereby reducing the amount of residual steel in the tundish and improving the molten steel yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 This is an overall structural diagram of a continuous casting tundish in the prior art; Figure 2 This is an overall structural diagram of a continuous casting tundish with improved flow field according to an embodiment of the present invention; Figure 3 A partially enlarged view of a turbulence controller according to an embodiment of the present invention; Figure 4 is a forward position diagram of a turbulence controller according to an embodiment of the present invention; Figure 5 A partial enlarged view of the dam in an embodiment of the present invention; Figure 6 is a forward position diagram of the dam in an embodiment of the present invention; Figure 7 This is a partial enlarged view of the weir in the embodiment of the present invention; Figure 8 is a forward position diagram of the weir in an embodiment of the present invention; Figure numerals: 1- tundish shell; 2- long water inlet; 3- turbulence controller; 4- dam; 5- weir; 6- steel hole through turbulence controller; 7- steel hole through dam body; 8- steel hole through weir body; 9- inclined surface; 10- molten steel; 11- covering agent; 12- dead zone of turbulator outer wall; 13- dead zone behind dam; 14- dead zone behind weir. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0023] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0024] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0025] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0026] Example 1: like Figure 1 As shown, in the continuous casting tundish in the prior art, dead zones 12 are formed on the outer sides of the turbulence controller 3, a dead zone 14 behind the weir is formed on the side of the weir 5 away from the long water outlet 2, and a dead zone 13 behind the dam is formed on the side of the dam 4 away from the long water outlet 2.

[0027] like Figures 2 to 8As shown, a continuous casting tundish for improving the flow field comprises a tundish shell 1 and a long nozzle 2; a turbulence controller 3 is provided in the tundish shell 1 for receiving the molten steel 10 flowing out of the long nozzle 2, the opening of the turbulence controller 3 is upward and located directly below the input port of the tundish shell 1; a dam 4 and a weir 5 are also provided in the tundish shell 1; a plurality of turbulence controller steel through holes 6 are horizontally opened on the turbulence controller 3, one end of the turbulence controller steel through hole 6 is connected to the turbulence controller 3, and the turbulence controller The other end of the device through steel hole 6 is located on the outer side of the turbulence controller 3; a plurality of dam body through steel holes 7 are horizontally opened on the dam 4, one end of the dam body through steel hole 7 is located on the side of the dam 4 close to the long water outlet 2, and the other end of the dam body through steel hole 7 is located on the side of the dam 4 away from the long water outlet 2; a plurality of weir body through steel holes 8 are horizontally opened on the weir 5, one end of the weir body through steel hole 8 is located on the side of the weir 5 close to the long water outlet 2, and the other end of the weir body through steel hole 8 is located on the side of the weir 5 away from the long water outlet 2.

[0028] In this embodiment, Figure 3 As shown, the vertical distance between the top and bottom sides of the turbulence controller through-steel hole 6 is set to the first spacing The height difference between the axis of the turbulence controller through-steel hole 6 and the bottom surface of the turbulence controller 3 is the first height difference , the first spacing The value range is 15~30 mm.

[0029] Specifically, the bottom side of the turbulence controller through-steel hole 6 and the bottom surface of the turbulence controller 3 are located on the same horizontal plane; the height difference between the bottom surface of the turbulence controller 3 and the bottom surface of the turbulence controller 3 is set as the fifth height difference , the first height difference The value of .

[0030] In addition, the first spacing The value is 20 mm, the fifth height difference The value is 20 mm, the first height difference The value is 30 mm.

[0031] In this embodiment, Figure 4 As shown, a plurality of turbulence controller through-steel holes 6 are horizontally opened on both sides of the turbulence controller 3, and the plurality of turbulence controller through-steel holes 6 on the same side of the turbulence controller 3 are equidistantly distributed; the horizontal distance between the axes of two adjacent turbulence controller through-steel holes 6 on the same side of the turbulence controller 3 is set as the first hole spacing , the first hole spacing The value range is 50~150 mm.

[0032] Specifically, three turbulence controller steel holes 6 are horizontally opened on both sides of the turbulence controller 3 .

[0033] In addition, the first hole spacing The value is 70 mm.

[0034] In this embodiment, Figure 5 As shown, the vertical distance between the top and bottom sides of the dam body through-steel hole 7 is set to the second spacing , the second spacing The value range is 15~30 mm; the height difference between the axis of the covering agent 11 in the tundish shell 1 and the dam body through-steel hole 7 is set as the second height difference , the second height difference The value range is 30~100 mm.

[0035] Specifically, the second spacing The value is 20 mm, the second height difference The value is 30 mm.

[0036] In this embodiment, Figure 6 As shown, the plurality of dam body through-steel holes 7 are distributed equidistantly; the horizontal distance between two adjacent dam body through-steel holes 7 is set as the second hole spacing , the second hole spacing The value range is 100~300 mm.

[0037] Specifically, five dam body through-steel holes 7 are horizontally opened on the dam 4 .

[0038] In addition, the second hole spacing The value is 200 mm.

[0039] In this embodiment, Figure 7 As shown, the vertical distance between the top and bottom sides of the dam body through-steel hole 8 is set to the third spacing The height difference between the axis of the weir body through-steel hole 8 and the bottom end of the weir 5 is the third height difference , the third spacing The value range of is 15~30 mm, and the third height difference The value range is 30~100 mm.

[0040] Specifically, the third spacing The value is 20 mm, the third height difference The value is 30 mm.

[0041] In this embodiment, Figure 8As shown, the plurality of weir body through-steel holes 8 are distributed equidistantly; the horizontal distance between two adjacent weir body through-steel holes 8 is set as the third hole spacing , the third hole spacing The value range is 100~300 mm.

[0042] Specifically, five weir body through-steel holes 8 are horizontally opened on the weir 5 .

[0043] In addition, the third hole spacing The value is 200 mm.

[0044] In this embodiment, Figure 5 As shown, the top of the dam 4 near the long shroud 2 is provided with an inclined surface 9 inclined toward the long shroud 2; the angle at which the inclined surface 9 is inclined toward the long shroud 2 is set as the inclined surface inclination angle , the inclined plane inclination angle The value range is 30°~45°.

[0045] Specifically, the slope angle The value is 40°.

[0046] In this embodiment, Figure 5 As shown, the height difference between the covering agent 11 in the tundish shell 1 and the bottom end of the inclined surface 9 is set as the fourth height difference , the fourth height difference The value range is 150~400 mm.

[0047] Specifically, the fourth height difference The value is 150 mm.

[0048] After testing, this embodiment is compared with the prior art: 1. The quality of the ingot is improved; the dead zone volume of the flow field in the tundish is reduced from 11% to 3.2%; the total oxygen content (purity index) of the ingot is reduced from 0.0023% to 0.0018%; 2. The amount of residual steel in the tundish is reduced; the amount of residual steel in the tundish is reduced from 2.5 tons to 1.8 tons.

[0049] Example 2: like Figures 2 to 8 As shown, in this embodiment, the first spacing The value is 18 mm, the fifth height difference The value is 20 mm, the first height difference The value of is 29 mm; the first hole spacing The value of is 65 mm; the second spacing The value is 18 mm, the second height difference The value of is 25 mm; the second hole spacing The value of is 180 mm; the third spacing The value is 18 mm, the third height difference The value of is 25 mm; the third hole spacing The value of is 180 mm; the inclination angle of the inclined plane The value of is 35°; the fourth height difference The value is 150 mm.

[0050] The rest is the same as Example 1.

[0051] After testing, this embodiment is compared with the prior art: 1. The quality of the ingot is improved; the dead zone volume of the flow field in the tundish is reduced from 13.5% to 3.5%; the total oxygen content (purity index) of the ingot is reduced from 0.0025% to 0.0020%; 2. The amount of residual steel in the tundish was reduced; the amount of residual steel in the tundish was reduced from 2.3 tons to 1.7 tons.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuous casting tundish for improving flow field, comprising a tundish shell (1) and a long shroud (2); A turbulence controller (3) for receiving the molten steel (10) flowing out of the long nozzle (2) is provided in the tundish shell (1), and the opening of the turbulence controller (3) faces upward and is located directly below the inlet of the tundish shell (1); A dam (4) and a weir (5) are also provided in the tundish shell (1); It is characterized by: A plurality of turbulence controller through-steel holes (6) are horizontally opened on the turbulence controller (3), one end of the turbulence controller through-steel hole (6) is connected to the inside of the turbulence controller (3), and the other end of the turbulence controller through-steel hole (6) is located on the outer surface of the turbulence controller (3); The dam (4) is provided with a plurality of dam body through-steel holes (7) horizontally, one end of the dam body through-steel hole (7) is located on a side of the dam (4) close to the long water inlet (2), and the other end of the dam body through-steel hole (7) is located on a side of the dam (4) away from the long water inlet (2); A plurality of weir body through-steel holes (8) are horizontally opened on the weir (5), one end of the weir body through-steel hole (8) is located on a side of the weir (5) close to the long water outlet (2), and the other end of the weir body through-steel hole (8) is located on a side of the weir (5) away from the long water outlet (2).

2. The continuous casting tundish with improved flow field according to claim 1, characterized in that: The vertical distance between the top side and the bottom side of the turbulence controller through-steel hole (6) is set as a first spacing, and the height difference between the axis of the turbulence controller through-steel hole (6) and the bottom surface of the turbulence controller (3) is set as a first height difference. The value range of the first spacing is 15 to 30 mm.

3. The continuous casting tundish with improved flow field according to claim 1, characterized in that: A plurality of turbulence controller steel holes (6) are horizontally opened on both sides of the turbulence controller (3), and the plurality of turbulence controller steel holes (6) on the same side of the turbulence controller (3) are equidistantly distributed; The horizontal distance between the axes of two adjacent turbulence controller through-steel holes (6) located on the same side of the turbulence controller (3) is set as a first hole spacing, and the value range of the first hole spacing is 50-150 mm.

4. The continuous casting tundish with improved flow field according to claim 1, characterized in that: The vertical distance between the top and bottom sides of the dam body through-steel hole (7) is set as a second spacing, and the value range of the second spacing is 15 to 30 mm; The height difference between the covering agent (11) in the tundish shell (1) and the axis of the dam body through-steel hole (7) is set as the second height difference, and the value range of the second height difference is 30-100 mm.

5. The continuous casting tundish with improved flow field according to claim 1, characterized in that: The plurality of dam body through-steel holes (7) are distributed at equal intervals; The horizontal distance between two adjacent dam body through-steel holes (7) is set as the second hole spacing, and the value range of the second hole spacing is 100-300 mm.

6. The continuous casting tundish with improved flow field according to claim 1, characterized in that: The vertical distance between the top side and the bottom side of the weir body through-steel hole (8) is set as a third spacing, and the height difference between the axis of the weir body through-steel hole (8) and the bottom end of the weir (5) is set as a third height difference. The value range of the third spacing is 15 to 30 mm, and the value range of the third height difference is 30 to 100 mm.

7. The continuous casting tundish with improved flow field according to claim 1, characterized in that: The plurality of weir body through-steel holes (8) are distributed at equal intervals; The horizontal distance between two adjacent weir body through-steel holes (8) is set as a third hole spacing, and the value range of the third hole spacing is 100-300 mm.

8. The continuous casting tundish with improved flow field according to claim 1, characterized in that: A slope (9) inclined toward the long water outlet (2) is provided on the top of the dam (4) on the side close to the long water outlet (2); The angle at which the inclined surface (9) is inclined toward the long water outlet (2) is set as the inclined surface inclination angle, and the value range of the inclined surface inclination angle is 30° to 45°.

9. The continuous casting tundish with improved flow field according to claim 8, characterized in that: The height difference between the covering agent (11) in the tundish shell (1) and the bottom end of the inclined surface (9) is set as a fourth height difference, and the value range of the fourth height difference is 150-400 mm.

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