Secondary cooling control method for slab continuous casting machine to avoid transverse cracks of corners of slabs
By subdividing the nozzle area of the slab continuous casting machine into the wide center, edge and corner, and combining the control loop and nozzle combination, the problem of transverse cracks at the corner of the slab was solved, and the precise control of the slab temperature and the improvement of strength were achieved.
Patent Information
- Application Number
- CN202511963659.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-24
- Publication Date
- 2026-03-27
AI Technical Summary
Existing secondary cooling control methods for slab continuous casting machines are difficult to adapt to changes in slab width, leading to overcooling or insufficient temperature at the corners, which can easily cause transverse cracks at the corners. This problem is particularly pronounced in crack-sensitive steel grades and low casting speed production.
The nozzles in the vertical section of the slab in the continuous casting machine are divided into three areas: the middle of the wide face, the edge of the wide face, and the corner of the narrow face. By selecting different control circuits and nozzle combinations, the water volume is automatically adjusted according to the width of the slab and the steel grade to ensure that the corner reaches the required temperature and avoid transverse cracks.
It effectively prevents transverse cracks at the corners of the billet, increases the corner temperature of the billet, enhances the strength of the billet, and adapts to the production needs of different widths and steel grades.
Smart Images
Figure CN121732745A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of steel metallurgy, and more particularly to a secondary cooling control method for avoiding slab corner transverse cracks of a slab continuous caster. BACKGROUND
[0002] The current slab continuous caster wide-face secondary cooling nozzle arrangement mainly adopts the width-cut method, that is, the middle nozzles and the edge nozzles are divided into different circuits and are controlled and adjusted separately. When different steel grades and widths are produced, the edge water quantity can be adjusted to avoid the problem of corner transverse cracks caused by the overcooling of the slab corner. However, due to the large number of fan-shaped segments, the pipeline of the caster is very complex, and generally can only be divided into two circuits, i.e., the middle circuit and the edge circuit. In actual production, the width of the slab is adjusted at any time as needed. The nozzle position arranged by the width-cut method is fixed, and it is often difficult to meet the needs of width changes, and the corner of the slab of some widths may be overcooled, resulting in the appearance of corner transverse cracks. Moreover, the speed of some steel grades is low, and even if weak cooling is adopted, the temperature of the corner of the slab entering the straightening area is still low, which also leads to the appearance of corner transverse cracks. Some methods adopt strong cooling mode for the corner, but in the production process, it is necessary to manually judge when to adopt strong cooling, and a separate control circuit is needed.
[0003] Therefore, the current control method has many problems and deficiencies: 1) The nozzle arrangement of the edge circuit and the middle circuit has limited adaptability to the width of the slab, and the corner of the slab of some sections may still be overcooled; 2) Crack-sensitive steel grades can generally only be produced at low speed, and weak cooling cannot guarantee the temperature of the corner; 3) When strong cooling is adopted for the corner, a separate control circuit is needed, and manual judgment is needed to determine whether to adopt strong cooling. SUMMARY
[0004] In view of the above problems, the purpose of the present application is to provide a secondary cooling control method for avoiding slab corner transverse cracks of a slab continuous caster to solve the problem that the current control method is prone to cause slab corner transverse cracks.
[0005] The present application provides a secondary cooling control method for avoiding slab corner transverse cracks of a slab continuous caster, comprising: dividing the nozzles of the vertical section area of the continuous caster slab into three areas, i.e., a wide-face middle area, a wide-face edge area, and a narrow-face corner area; According to the width of the slab and the produced steel grade, the nozzles of the edge area of the first control circuit, the nozzles of the narrow-face corner area, or the nozzles of the wide-face middle area of the second control circuit are selected to perform secondary cooling treatment on the slab, so that the corner of the slab reaches the required temperature.
[0006] Further, the first control circuit includes two cut-off valves, a wide-face side region cut-off valve and a narrow-face corner region cut-off valve, wherein The first control circuit controls the nozzles of the wide-face side region to perform secondary cooling on the cast blank through the wide-face side region cut-off valve. The first control circuit controls the nozzles of the narrow-face corner region to perform secondary cooling on the cast blank through the narrow-face corner region cut-off valve.
[0007] Further, the second control circuit includes a wide-face middle region cut-off valve, and the second control circuit controls the nozzles of the wide-face middle region to perform secondary cooling on the cast blank through the wide-face middle region cut-off valve.
[0008] Further, in the production of a crack-insensitive steel grade, If the width of the cast blank is less than the width of the wide-face middle region, the two cut-off valves in the first control circuit are in a closed state, and the nozzles of the wide-face middle region are controlled by the second control circuit to perform secondary cooling on the cast blank. If the width of the cast blank is greater than the width of the wide-face middle region, the narrow-face corner region cut-off valve is in a closed state, the first control circuit controls the nozzles of the wide-face side region to perform secondary cooling on the cast blank through the wide-face side region cut-off valve, and the nozzles of the wide-face middle region are controlled by the second control circuit to perform secondary cooling on the cast blank.
[0009] Further, in the production of a crack-insensitive steel grade, If the width of the cast blank is less than the width of the wide-face middle region, the wide-face side region cut-off valve is in a closed state, the first control circuit controls the nozzles of the narrow-face corner region to perform secondary cooling on the cast blank through the narrow-face corner region cut-off valve, and the second control circuit controls the nozzles of the wide-face middle region to perform secondary cooling on the cast blank, so that the temperature of the corner of the cast blank is less than 650℃.
[0010] Further, in the production of a crack-insensitive steel grade, If the width of the billet is greater than the width of the central region of the wide face, and the casting speed of the billet is greater than 1.2 m / min, then the shut-off valve of the corner region of the narrow face is closed. The first control circuit controls the nozzle of the edge region of the wide face to perform secondary cooling treatment on the billet through the shut-off valve of the edge region of the wide face, and controls the nozzle of the central region of the wide face to perform secondary cooling treatment on the billet through the second control circuit, so that the temperature of the corner of the billet is greater than 950°C.
[0011] In addition, an alternative technical solution is that, when producing crack-sensitive steel grades, the nozzle spray in the middle area of the wide face does not cover the corner area of the narrow face of the billet; If the width of the billet is greater than the width of the central region of the wide face, and the casting speed of the billet is less than 1.2 m / min, then the shut-off valve of the edge region of the wide face in the first control circuit is closed, and the nozzle of the central region of the wide face is controlled by the second control circuit to perform secondary cooling treatment on the billet, and the first control circuit performs secondary cooling treatment on the billet through the nozzle of the corner region of the narrow face, so that the temperature of the corner of the billet is less than 650°C.
[0012] In addition, an optional technical solution is that both the first control loop and the second control loop include a ball valve, a regulating valve, a flow meter, and a pressure gauge, wherein... The water flow in the two control loops is controlled by the ball valve and the regulating valve. The flow meter is used to measure the value of the water flow rate; The pressure gauge is used to measure the pressure of the water flow in the two control loops.
[0013] Furthermore, an alternative technical solution is to provide several rows of nozzles at the inner and outer arc corners of the narrow face of the casting billet to form the corner region of the narrow face; and, The nozzle in the narrow corner region is fixed on the narrow face widening mechanism of the crystallizer and moves together with the foot roller of the narrow face, so that the nozzle in the narrow corner region maintains a preset distance from the narrow face of the billet.
[0014] As can be seen from the above technical solution, the secondary cooling control method for avoiding transverse cracks at the corners of slabs in continuous casting machines provided by the present invention divides the nozzles in the vertical section of the slab in the continuous casting machine into three regions: the wide-face middle region, the wide-face edge region, and the narrow-face corner region. Based on the width of the slab and the type of steel being produced, the wide-face edge or narrow-face nozzles of the first control loop and the second control loop are selected to perform secondary cooling treatment on the slab, ensuring that the corners of the slab reach the required temperature. This guarantees that the corners of the slab have a sufficiently high temperature to pass through the straightening zone, or that strong cooling at the corners refines the grains, improves the strength of the slab corners, and prevents the occurrence of transverse cracks at the corners.
[0015] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to encompass all such aspects and their equivalents. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the nozzle arrangement in the vertical section region of the slab according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the nozzle planar arrangement in the vertical section region of the slab according to an embodiment of the present invention; Figure 3 This is a nozzle control diagram for the vertical section region of a slab according to an embodiment of the present invention.
[0018] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation
[0019] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.
[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0021] This invention can be modified and has various embodiments, with specific embodiments illustrated in the accompanying drawings. However, this invention is not limited to this particular implementation and all modifications, equivalents, and substitutions falling within the spirit and technical scope of this invention are to be understood as included.
[0022] Ordinal terms such as "first," "second," etc., may be used to describe various constituent elements, but the constituent elements are not limited to these terms. The terms are used only to distinguish one constituent element from another. For example, without departing from the scope of the claims of this invention, a second constituent element may be named a first constituent element, and similarly, a first constituent element may be named a second constituent element. Terms and / or include combinations of multiple associated items or one of multiple associated items.
[0023] It should be understood that when referring to a constituent element being "connected" or "in contact" with other constituent elements, this includes not only cases where it is directly connected or in contact with other constituent elements, but also cases where other constituent elements exist between them. Conversely, when referring to a constituent element being "directly connected" or "directly in contact" with other constituent elements, it should be understood that no other constituent elements exist between them.
[0024] In response to the aforementioned problems that existing controlled cooling methods can easily lead to transverse cracks at the corners of slabs, this invention proposes a secondary cooling control method for slab continuous casting machines to avoid transverse cracks at the corners of slabs.
[0025] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0026] To illustrate the secondary cooling control method provided by this invention for preventing transverse cracks at the corners of slabs in continuous casting machines, Figures 1 to 3 Examples from different perspectives illustrate secondary cooling control methods for preventing transverse corner cracks in slabs during continuous casting. Specifically, Figure 1 This is a schematic diagram of the nozzle arrangement in the vertical section region of the slab according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the nozzle planar arrangement in the vertical section region of the slab according to an embodiment of the present invention; Figure 3 This is a nozzle control diagram for the vertical section region of a slab according to an embodiment of the present invention.
[0027] like Figures 1 to 3As shown in the figure, the present invention provides a secondary cooling control method for avoiding transverse cracks at the corners of slabs in a slab continuous casting machine. The nozzles in the vertical section of the slab in the continuous casting machine are divided into three regions: the middle region of the wide face, the edge region of the wide face, and the corner region of the narrow face. According to the width of the slab and the type of steel being produced, the nozzles in the edge region of the wide face, the corner region of the narrow face, or the middle region of the wide face in the second control loop are selected to perform secondary cooling treatment on the slab, so that the corners of the slab reach the required temperature.
[0028] That is, the first control loop controls the nozzles in the wide side area and the nozzles in the narrow corner area to perform secondary cooling treatment on the billet; and the second control loop controls the nozzles in the wide middle area to perform secondary cooling treatment on the billet.
[0029] Specifically, each control loop includes a ball valve, a regulating valve, a flow meter, and a pressure gauge. The ball valve and the regulating valve control the water flow in both control loops. The flow meter measures the water flow rate. The pressure gauge measures the pressure of the water flow in both control loops. The first control loop also includes two shut-off valves, and the second control loop also includes one shut-off valve.
[0030] The first control loop includes two shut-off valves (a wide-face edge area shut-off valve and a narrow-face corner area shut-off valve), a first ball valve, a first regulating valve, a first flow meter, and a first pressure gauge. The first ball valve and the first regulating valve control the water flow rate in the first control loop. The first flow meter measures the water flow rate, and the first pressure gauge measures the water pressure in the first control loop. The second control loop includes a wide-face center area shut-off valve, a second ball valve, a second regulating valve, a second flow meter, and a second pressure gauge. The second ball valve and the second regulating valve control the water flow rate in the second control loop. The second flow meter measures the water flow rate, and the second pressure gauge measures the water pressure in the second control loop.
[0031] The first control circuit controls the nozzles in the wide-side edge region to perform secondary cooling treatment on the billet via the wide-side edge region shut-off valve; the first control circuit also controls the nozzles in the narrow-side corner region to perform secondary cooling treatment on the billet via the narrow-side corner region shut-off valve. The second control circuit includes a wide-side center region shut-off valve, which controls the nozzles in the wide-side center region to perform secondary cooling treatment on the billet.
[0032] In embodiments of the present invention, based on the billet width and steel grade, it is determined whether weak or strong cooling is applied to the corners of the billet (the first control loop controls the edge or corner nozzles), and the secondary cooling water at the edges or corners is automatically activated to prevent transverse cracks from appearing at the corners of the billet. During production, the casting steel grade and the input billet width are considered. The following embodiments will be described in detail.
[0033] Example 1 When producing steel grades that are not sensitive to cracking, if the width of the billet is less than the width of the central region of the wide face, the two shut-off valves in the first control circuit are closed, and the nozzles in the central region of the wide face are controlled by the second control circuit through the shut-off valve of the central region of the wide face to perform secondary cooling treatment on the billet; if the width of the billet is greater than the width of the central region of the wide face, the shut-off valve in the corner region of the narrow face is closed, the first control circuit controls the nozzles in the edge region of the wide face to perform secondary cooling treatment on the billet through the shut-off valve of the edge region of the wide face, and the second control circuit controls the nozzles in the central region of the wide face to perform secondary cooling treatment on the billet.
[0034] Specifically, when producing crack-insensitive steel grades, the narrow-corner region shut-off valve in the first control circuit of the nozzle in the narrow-corner region is always automatically kept closed. If the billet width is less than... Figure 3 The A value in the code ensures that the wide-side edge region shut-off valve of the first control circuit for the nozzles in the wide-side region remains automatically closed, and the water volume required by the second control circuit for the nozzles in the middle region of the wide-side region is automatically adjusted to meet the cooling requirements of the cast billet. If the width of the cast billet is greater than... Figure 3 The A value, the first control circuit of the nozzle in the wide side area and the second control circuit of the nozzle in the wide middle area should be adjusted according to the required water volume to meet the requirements of billet cooling.
[0035] Example 2 When producing crack-sensitive steel grades, the nozzle in the middle region of the wide face covers the corner region of the narrow face of the billet; if the width of the billet is less than the width of the middle region of the wide face, the shut-off valve of the edge region of the wide face is closed, and the first control circuit controls the nozzle in the corner region of the narrow face and the nozzle in the middle region of the wide face to perform secondary cooling treatment on the billet, so that the temperature of the corner of the billet is less than 650°C.
[0036] Specifically, when producing crack-sensitive steel grades, if the billet width is less than... Figure 3The value A in the diagram indicates that the nozzles in the wide-face central region have already covered the corners of the billet, making it difficult to maintain a sufficiently high temperature at the corners of the billet as it passes through the straightening zone of the casting machine. The wide-face edge region shut-off valve of the first control circuit for the wide-face edge region nozzles automatically remains closed, while the narrow-face corner region shut-off valve of the first control circuit for the narrow-face corner region nozzles automatically opens. The second control circuit controls the nozzles in the wide-face central region, automatically determining the water volume based on the steel grade and casting speed to strongly cool the corners of the billet (generally to below 650°C), thereby refining the grain size.
[0037] Example 3 When producing crack-sensitive steel grades, and the nozzle in the middle region of the wide face does not cover the corner region of the narrow face of the billet; if the width of the billet is greater than the width of the middle region of the wide face, and the casting speed of the billet is greater than 1.2 m / min, then the shut-off valve of the corner region of the narrow face is closed. The first control circuit controls the nozzle in the edge region of the wide face to perform secondary cooling treatment on the billet through the shut-off valve of the edge region of the wide face, and controls the nozzle in the middle region of the wide face to perform secondary cooling treatment on the billet through the second control circuit, so that the temperature of the corner of the billet is greater than 950°C.
[0038] Specifically, when producing crack-sensitive steel grades, if the billet width is greater than... Figure 3 The value A in the middle area of the wide face does not cover the corner of the billet. If the production speed is high (reaching 1.2m / min), the first control circuit of the nozzle in the edge area of the wide face and the second control circuit of the nozzle in the middle area of the wide face must be adjusted according to the required water volume to meet the cooling requirements of the billet and ensure that the corner of the billet has a high temperature (generally above 950℃).
[0039] Example 4 When producing crack-sensitive steel grades, and the nozzle in the central region of the wide face does not cover the corner region of the narrow face of the billet; if the width of the billet is greater than the width of the central region of the wide face, and the casting speed of the billet is less than 1.2 m / min, then the shut-off valve of the edge region of the wide face in the first control circuit is closed, and the billet is subjected to secondary cooling treatment through the nozzle in the corner region of the narrow face, and through the nozzle in the central region of the wide face controlled by the second control circuit, so that the temperature of the corner of the billet is less than 650°C.
[0040] Specifically, when producing crack-sensitive steel grades, if the billet width is greater than... Figure 3In the A value, the nozzle in the middle area does not cover the corner of the billet. If the production speed is low (less than 1.2m / min), it is generally impossible to guarantee a high temperature at the corner of the billet. Therefore, it is necessary to automatically open the first control circuit of the narrow corner area of the billet and the second control circuit of the nozzle in the middle area of the wide face. The water volume is automatically determined according to the steel grade and the casting speed to perform strong cooling on the corner of the billet (generally to reach below 650℃) to refine the grains.
[0041] Furthermore, in an embodiment of the present invention, a plurality of rows of nozzles are provided on the inner and outer arc corners of the narrow face of the billet to form the corner region of the narrow face; and the nozzles in the corner region of the narrow face are fixed on the narrow face widening mechanism of the crystallizer and move together with the foot roller of the narrow face, so that the nozzles in the corner region of the narrow face maintain a preset distance from the narrow face of the billet.
[0042] As can be seen from the above technical solution, the secondary cooling control method for avoiding transverse cracks at the corners of slabs in continuous casting machines provided by the present invention divides the nozzles in the vertical section of the slab in the continuous casting machine into three regions: the wide-face middle region, the wide-face edge region, and the narrow-face corner region. Based on the width of the slab and the type of steel being produced, the wide-face edge or narrow-face nozzles of the first control loop are selected, and the slab is subjected to secondary cooling treatment by the second control loop. This ensures that the corners of the slab reach the required temperature, guaranteeing that the corners of the slab reach a sufficiently high temperature to pass through the straightening zone, or that strong cooling at the corners refines the grains, improving the strength of the slab corners and preventing the occurrence of transverse cracks at the corners.
[0043] The above are merely preferred embodiments of the present invention and do not limit the scope of protection of the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any changes, modifications, substitutions, integrations, and parameter alterations to these embodiments within the spirit and principles of the present invention, achieved through conventional substitutions or by achieving the same function without departing from the principles and spirit of the present invention, fall within the scope of protection of the present invention.
Claims
1. A secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine, characterized in that, include: The nozzles in the vertical section of the slab section of the continuous casting machine are divided into three areas: the middle area of the wide face, the edge area of the wide face, and the corner area of the narrow face. Depending on the width of the billet and the type of steel being produced, a nozzle in the wide edge region of the first control loop, a nozzle in the narrow corner region, or a nozzle in the wide center region of the second control loop is selected to perform a secondary cooling treatment on the billet, so that the corners of the billet reach the required temperature.
2. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 1, characterized in that, The first control circuit includes two shut-off valves: a wide-side edge region shut-off valve and a narrow-side corner region shut-off valve. The first control loop controls the nozzle in the wide-side edge region to perform secondary cooling treatment on the billet through the wide-side edge region shut-off valve; The first control circuit controls the nozzle in the narrow corner region to perform secondary cooling treatment on the billet through the shut-off valve in the narrow corner region.
3. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 2, characterized in that, The second control loop includes a central region shut-off valve, which controls the nozzle in the central region of the wide face to perform secondary cooling treatment on the billet.
4. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 3, characterized in that, When producing steel grades that are not sensitive to cracking, If the width of the billet is less than the width of the central region of the wide face, then the two shut-off valves in the first control circuit are closed, and the nozzles in the central region of the wide face are controlled by the second control circuit to perform secondary cooling treatment on the billet. If the width of the billet is greater than the width of the central region of the wide face, the shut-off valve of the corner region of the narrow face is closed. The first control circuit controls the nozzle of the edge region of the wide face to perform secondary cooling treatment on the billet through the shut-off valve of the edge region of the wide face, and controls the nozzle of the central region of the wide face to perform secondary cooling treatment on the billet through the second control circuit.
5. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 3, characterized in that, When producing crack-sensitive steel, the nozzle in the middle of the wide face covers the corner area of the narrow face of the billet. If the width of the billet is less than the width of the middle region of the wide face, the shut-off valve of the edge region of the wide face is closed. The first control circuit controls the nozzle of the corner region of the narrow face to perform secondary cooling treatment on the billet through the shut-off valve of the corner region of the narrow face. The second control circuit controls the nozzle of the middle region of the wide face to perform secondary cooling treatment on the billet, so that the temperature of the corner of the billet is less than 650°C.
6. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 3, characterized in that, When producing crack-sensitive steel grades, the nozzle spray in the middle area of the wide face does not cover the narrow corner area of the billet; If the width of the billet is greater than the width of the central region of the wide face, and the casting speed of the billet is greater than 1.2 m / min, then the shut-off valve of the corner region of the narrow face is closed. The first control circuit controls the nozzle of the edge region of the wide face to perform secondary cooling treatment on the billet through the shut-off valve of the edge region of the wide face, and controls the nozzle of the central region of the wide face to perform secondary cooling treatment on the billet through the second control circuit, so that the temperature of the corner of the billet is greater than 950°C.
7. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 3, characterized in that, When producing crack-sensitive steel grades, the nozzle spray in the middle area of the wide face does not cover the narrow corner area of the billet; If the width of the billet is greater than the width of the central region of the wide face, and the casting speed of the billet is less than 1.2 m / min, then the shut-off valve of the edge region of the wide face in the first control circuit is closed, and the nozzle of the central region of the wide face is controlled by the second control circuit to perform secondary cooling treatment on the billet, and the nozzle of the corner region of the narrow face in the first control circuit performs secondary cooling treatment on the billet, so that the temperature of the corner of the billet is less than 650°C.
8. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 3, characterized in that, Both the first and second control loops include ball valves, regulating valves, flow meters, and pressure gauges. The water flow in the two control loops is controlled by the ball valve and the regulating valve. The flow meter is used to measure the value of the water flow rate; The pressure gauge is used to measure the pressure of the water flow in the two control loops.
9. The secondary cooling control method for preventing transverse cracks at the corners of slabs in a slab continuous casting machine according to claim 1, characterized in that, Several rows of nozzles are provided at the inner and outer arc corners of the narrow face of the casting billet to form the corner area of the narrow face; and... The nozzle in the narrow corner region is fixed on the narrow face widening mechanism of the crystallizer and moves together with the foot roller of the narrow face, so that the nozzle in the narrow corner region maintains a preset distance from the narrow face of the billet.