A method of surface quenching of a continuous casting billet

Abstract

A continuous casting billet surface quenching method in the embodiment of the present application, by cutting the continuous casting billet leaving the continuous casting machine, the to-be-quenched billet is obtained, the to-be-quenched billet is conveyed into the first quenching area for first-stage quenching, and the surface temperature after the first-stage quenching is controlled within the first preset temperature threshold range, the once-quenched billet is obtained, the once-quenched billet is conveyed into the temperature-recovery area for temperature recovery, the once-quenched billet after the temperature recovery is obtained, the once-quenched billet after the temperature recovery is quenched in the second quenching area, the surface temperature after the second-stage quenching is controlled within the second preset temperature threshold range, the twice-quenched billet is obtained, and the twice-quenched billet is conveyed to the heating furnace; the method can effectively reduce the surface temperature of the continuous casting billet under high speed to a suitable temperature range by setting two quenching areas for quenching control of the continuous casting billet under high speed, and the temperature recovery section between the quenching areas can reduce the quenching stress.

Description

Technical Field

[0001] This application relates to the field of continuous casting production, and in particular to a method for surface quenching of continuously cast billets. Background Technology

[0002] Hot charging technology for continuously cast billets can utilize the billet's own heat energy to reduce furnace consumption, and has received increasing attention in the context of "carbon peaking and carbon neutrality." However, this technology can easily lead to surface cracks in the billet within the furnace, known as hot charging cracks. Surface quenching of the billet is an effective method to address hot charging cracks. This method involves spraying water onto the billet surface for forced cooling before it enters the furnace, lowering the surface temperature to below the Ar1 temperature (the temperature at which austenite transforms into pearlite during cooling), thus controlling the formation of hot charging cracks.

[0003] In existing technologies, a one-stage surface quenching method is used for continuously cast slabs. While this can solve the problem of hot-transfer cracking in continuously cast slabs at conventional casting speeds, for high-speed continuously cast slabs, due to the high internal heat storage, although one-stage surface quenching can quickly reduce the surface temperature of the slab to below Ar1, the surface temperature will rise again above Ar1 when the slab enters the furnace after quenching as heat is transferred from the inside of the slab to the surface. Therefore, the slab still faces the risk of hot-transfer cracking. Furthermore, with one-stage surface quenching, when the surface temperature of the slab is too low, the sprayed water changes from a nucleation boiling state to a contact state on the slab surface, reducing the heat transfer coefficient and heat flow. Even increasing the quenching efficiency by increasing the amount of quenching water or the quenching length has limited effect. Therefore, given the limited capabilities of one-stage surface quenching, the problem of hot-transfer cracking in continuously cast slabs needs further solutions. Summary of the Invention

[0004] The purpose of this invention is to provide a method for quenching the surface of a continuously cast billet, so as to solve the problem that existing methods cannot reduce the surface temperature of the billet to a suitable temperature range when the internal heat of the billet is high in high-speed continuous casting.

[0005] The present invention provides a method for surface quenching of continuously cast slabs, comprising: cutting the continuously cast slab leaving the continuous casting machine to obtain a slab to be quenched; conveying the slab to be quenched into a first quenching zone for a first stage of quenching, and controlling the surface temperature of the slab after the first stage of quenching within a first preset temperature threshold range to obtain a first-quenched slab; conveying the first-quenched slab into a reheating zone for reheating to obtain a reheated first-quenched slab, wherein the length of the reheating zone is greater than a preset reheating zone length threshold; performing a second stage of quenching on the reheated first-quenched slab in a second quenching zone, controlling the surface temperature of the reheated first-quenched slab after the second stage of quenching within a second preset temperature threshold range to obtain a second-quenched slab, and conveying the second-quenched slab to a heating furnace, wherein the first quenching zone and the second quenching zone are located on the same conveyor roller conveyor.

[0006] In one embodiment of the present invention, the first quenching region and the second quenching region include an inner arc side quenching device, an outer arc side quenching device, and two side quenching devices.

[0007] In one embodiment of the present invention, the water flow density of the inner arc side quenching device in the first quenching region is 3.0–5.0 L / (m³). 2 ·s), wherein the water flow density of the outer arc side quenching device is 1.4 to 1.6 times that of the inner arc side quenching device, and the water flow density of the two side quenching devices is 0.3 to 0.5 times that of the inner arc side quenching device.

[0008] In one embodiment of the present invention, the water flow density of the inner arc side quenching device in the second quenching region is 2.0–4.0 L / (m³). 2 ·s), wherein the water flow density of the outer arc side quenching device is 1.4 to 1.6 times that of the inner arc side quenching device, and the water flow density of the two side quenching devices is 0.3 to 0.5 times that of the inner arc side quenching device.

[0009] In one embodiment of the present invention, the quenching water flow rate in the first quenching zone or the second quenching zone can be determined based on the following calculation formula:

[0010] Q i =3.6(w i L i b + (1.4 ~ 1.6)w i L i b + (0.6 ~ 1.0)w i L i h)

[0011] Q i This represents the water flow rate in the i-th quenching zone, in m³ / h; w iL represents the water flow density of the quenching device on the inner arc side of the quenching region in the i-th segment, and the unit is L / (m). 2 ·s); L i b represents the length of the i-th quenching region in meters; h represents the width of the slab to be quenched in meters; and i represents the thickness of the slab to be quenched in meters.

[0012] In one embodiment of the present invention, the distance between the first quenching zone and the continuous casting machine is 3 to 5 meters.

[0013] In one embodiment of the present invention, the length of the first quenching region is 2 to 4 m.

[0014] In one embodiment of the present invention, the length of the second quenching region is 2 to 4 m.

[0015] In one embodiment of the present invention, the first preset temperature threshold range is 400±50℃.

[0016] In one embodiment of the present invention, the second preset temperature threshold range is 400±50℃.

[0017] In one embodiment of the present invention, the length of the preset reheating zone ranges from 3 to 5 meters.

[0018] This invention discloses a method for surface quenching of continuously cast slabs. The method involves cutting the continuously cast slab leaving the continuous casting machine to obtain a slab to be quenched. This slab is then transported to a first quenching zone for first-stage quenching, and the surface temperature after the first-stage quenching is controlled within a first preset temperature threshold range to obtain a first-quenched slab. The first-quenched slab is then transported to a reheating zone for reheating, resulting in a reheated first-quenched slab. This reheated first-quenched slab is then subjected to a second quenching zone for second-stage quenching, and the surface temperature after the second-stage quenching is controlled within a second preset temperature threshold range to obtain a second-quenched slab. The second-quenched slab is then transported to a heating furnace. This method, by setting two quenching zones to control the quenching of continuously cast slabs at high casting speeds, can effectively reduce the surface temperature of the slab to a suitable temperature range at high casting speeds. Furthermore, the reheating zone between the quenching zones can reduce quenching stress.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0021] Figure 1 This is a schematic diagram illustrating an exemplary surface hardening apparatus architecture as shown in an exemplary embodiment of this application;

[0022] Figure 2 This is a flowchart illustrating an exemplary embodiment of the present application of a method for surface quenching of a continuously cast billet;

[0023] Figure 3 This is an exemplary embodiment of the present application illustrating a continuous casting slab surface quenching method and a trend diagram of surface temperature variation of the continuous casting slab.

[0024] Figure 4 This is an exemplary embodiment of the present application illustrating the surface temperature variation trend of a continuously cast slab using a one-stage surface quenching method;

[0025] Figure 5 This is a schematic diagram of the structure of a computer system for an electronic device, as illustrated in an exemplary embodiment of this application. Detailed Implementation

[0026] The embodiments of the present invention will be described below with reference to the accompanying drawings and specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0028] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0029] The term "and / or" used in this application describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the related objects before and after it are in an "or" relationship.

[0030] First, it should be noted that surface quenching of continuously cast billets refers to the process of spraying water to strongly cool the surface of the billet after it leaves the continuous casting machine and before it enters the heating furnace during the continuous casting process. This process controls the precipitation of microstructure, microalloyed carbon carbonitrides, and aluminum nitride on the surface of the billet, thereby controlling surface cracks of the continuously cast billet during hot delivery and charging.

[0031] Hot charging and conveying of continuously cast billets is a technology that optimizes the steel production process, aiming to improve steel product quality, reduce production costs, and maximize production efficiency. Before being fed into the rolling mill, the continuously cast billet is first heated to an appropriate temperature. This heating process can occur after the billet leaves the continuous casting machine and is fed into the rolling mill via a continuous conveying path. During rolling, the billet is subjected to pressure and deformation, causing changes in its internal crystal structure, further improving the quality of the steel. Its advantages include the elimination of conventional preheating and heating processes because the billet is heated to a high temperature immediately after leaving the continuous casting machine. This not only reduces production time and energy consumption but also reduces oxidation and pollution during the production process, improving product purity and quality. Furthermore, hot charging and conveying technology allows for flexible adjustment and matching of continuous casting and rolling production capacities.

[0032] Ar1 refers to the temperature at which austenite transforms into pearlite during cooling.

[0033] Flame cutting is a common method for rough machining of steel plates, using a flame generated by the combustion of a combustible gas and oxygen to cut metal. Traditional flame cutting uses acetylene gas, but propane and natural gas are also used. Specifically, flame cutting, also known as gas cutting, involves melting the metal with a preheated flame and then using high-pressure gas to blow away the molten metal, thus creating a cut.

[0034] The beneficial effects provided by this application also include: the nozzles are arranged closely along the width direction and the casting direction of the continuous casting slab to ensure uniform cooling of the slab surface; the spraying method is more in line with the heat transfer law of continuous casting slab spraying, and has higher quenching efficiency, which can solve the problem of insufficient surface quenching capacity of the current high casting speed one-stage quenching.

[0035] Figure 1 This is a schematic diagram illustrating an exemplary surface hardening apparatus architecture as shown in an exemplary embodiment of this application.

[0036] like Figure 1 As shown, Figure 1 In this diagram, 1 represents the conveyor roller; 2 represents the slab to be quenched; 3 represents the quenching spray rack; and 4 represents the quenching nozzle. The process comprises five stages: flame cutting, pre-quenching conveying section, first-stage quenching, reheating section, and second-stage quenching.

[0037] In one embodiment of this application, the conveying direction of the conveyor rollers is consistent with the drawing direction of the continuously cast slab; the upper side of the conveyor rollers is the inner arc side of the continuously cast slab, and an inner arc side quenching device is provided above it; the lower side of the conveyor rollers is the outer arc side of the continuously cast slab, and an outer arc side quenching device is provided below it; and quenching devices are provided on both sides of the continuously cast slab. The quenching devices are symmetrically arranged. The quenching device consists of a quenching spray frame and quenching nozzles.

[0038] It should be noted that the surface quenching method for continuously cast billets in this application is applicable to scenarios including but not limited to the quenching requirements of high-speed continuous casting slabs and conventional-speed continuous casting slabs in hot charging and hot delivery technology environments.

[0039] Figure 2 This is a flowchart illustrating an exemplary embodiment of a continuous casting billet surface quenching method. (Refer to...) Figure 2 As shown, the flowchart of the continuous casting billet surface quenching method includes at least steps S210 to S240, which are described in detail below:

[0040] In step S210, the continuously cast slab leaving the continuous casting machine is cut to obtain a slab to be quenched.

[0041] In one embodiment of this application, the distance between the first quenching zone and the continuous casting machine is 3 to 5 meters.

[0042] In one embodiment of this application, the cutting method for cutting the continuously cast slab leaving the continuous casting machine is flame cutting.

[0043] In step S220, the slab to be quenched is conveyed into the first quenching area for the first stage of quenching, and the surface temperature of the slab to be quenched after the first stage of quenching is controlled within the first preset temperature threshold range to obtain a quenched slab.

[0044] In one embodiment of this application, the length of the first quenching zone is 2 to 4 m.

[0045] In one embodiment of this application, the first preset temperature threshold range is 400±50℃.

[0046] In step S230, the quenched slab is conveyed into the reheating zone for reheating to obtain a reheated quenched slab.

[0047] In one embodiment of this application, the length of the warming region is greater than a preset warming region length threshold.

[0048] In one embodiment of this application, the aforementioned reheating region is located between the first quenching region and the second quenching region.

[0049] In one embodiment of this application, the preset warming zone length ranges from 3 to 5 meters.

[0050] In step S240, the first-quenched slab after reheating is subjected to a second-stage quenching in the second quenching zone. The surface temperature of the first-quenched slab after reheating is controlled within the second preset temperature threshold range to obtain a second-quenched slab, which is then transported to the heating furnace.

[0051] In one embodiment of this application, the length of the second quenching zone is 2 to 4 m.

[0052] In one embodiment of this application, the second preset temperature threshold range is 400±50℃.

[0053] In one embodiment of this application, the first quenching region and the second quenching region are located on the same conveyor roller.

[0054] In one embodiment of this application, the first quenching region and the second quenching region include an inner arc-side quenching device, an outer arc-side quenching device, and two-sided quenching devices.

[0055] In one embodiment of this application, the first quenching zone and the second quenching zone use water nozzles or air-water nozzles. The nozzles are arranged closely along the width direction and the drawing direction of the continuously cast slab to ensure uniform cooling of the slab surface.

[0056] In one embodiment of this application, quenching based on the above-mentioned spraying method is more in line with the heat transfer law of continuous casting slab spraying, has higher quenching efficiency, and can solve the problem of insufficient surface quenching capacity of single-stage quenching at high casting speed.

[0057] In one embodiment of this application, the water flow density of the quenching device on the inner arc side of the first quenching region is 3.0–5.0 L / (m³). 2The water flow density of the outer arc side quenching device is 1.4 to 1.6 times that of the inner arc side quenching device, and the water flow density of the two side quenching devices is 0.3 to 0.5 times that of the inner arc side quenching device.

[0058] In one embodiment of this application, the water flow density of the inner arc side quenching device in the second quenching region is 2.0–4.0 L / (m³). 2 The water flow density of the outer arc side quenching device is 1.4 to 1.6 times that of the inner arc side quenching device, and the water flow density of the two side quenching devices is 0.3 to 0.5 times that of the inner arc side quenching device.

[0059] In one embodiment of this application, the quenching water flow rate in the first quenching zone or the second quenching zone can be determined based on the following calculation formula:

[0060] Q i =3.6(w i L i b + (1.4 ~ 1.6)w i L i b + (0.6 ~ 1.0)w i L i h)

[0061] Q i This represents the water flow rate in the i-th quenching zone, in m³ / h; w i L represents the water flow density of the quenching device on the inner arc side of the quenching region in the i-th segment, and the unit is L / (m). 2 ·s); L i b represents the length of the i-th quenching region in meters; h represents the width of the slab to be quenched in meters; and i represents the thickness of the slab to be quenched in meters.

[0062] Please see Figure 3 , Figure 3 This is an exemplary embodiment of the present application illustrating the surface quenching method for continuously cast slabs, showing the temperature change trend of the continuously cast slab surface.

[0063] In one specific embodiment of this application, the surface temperature of the continuously cast slab leaving the continuous casting machine is 900-920°C. After the first stage of quenching, the surface temperature drops to about 400°C. Then, in the reheating stage, the surface temperature of the continuously cast slab rises to about 720°C. After the second stage of quenching, the surface temperature of the continuously cast slab drops to about 400°C, and finally the temperature rises to about 700°C. This quenching method effectively controls the temperature after quenching below the Ar1 temperature, avoiding the generation of hot-transfer cracks in the continuously cast slab.

[0064] The following is a specific implementation method and implementation data of the quenching method in the above embodiments of this application, used to verify the feasibility and beneficial effects of the method.

[0065] In one specific embodiment of this application, the continuous casting machine has an arc radius of 9.0m, a casting machine length of 27.0m, and the distance from the end position of the flame cutting to the meniscus of the crystallizer is 46.5m. The steel grade used in this case is SPHC steel, the cross-sectional dimensions of the continuously cast slab are 200mm × 1300mm, the casting temperature is 1560℃, the production speed is 1.8m / min, and the secondary cooling water ratio is 1.00L / kg. During the continuous casting process, after the SPHC steel slab is flame-cut, it is conveyed to the heating furnace via the conveyor rollers in about 10 minutes.

[0066] It should be noted that the Ar1 temperature of SPHC steel is 716℃. In order to control the occurrence of hot-feeding cracks in SPHC steel continuous casting billets, it is necessary to control the surface temperature of the billet below 716℃ when the SPHC steel enters the heating furnace.

[0067] In one specific embodiment of this application, the starting position of the first quenching stage is 3.5m away from the ending position of the flame cutting. The length of the first quenching zone is 3.0m. The water flow density of the inner arc side quenching device is 3.4L / (m2·s); the water flow density of the outer arc side quenching device is 1.5 times that of the inner arc side quenching device, i.e., 5.1L / (m2·s); the water flow density of the two side quenching devices is 0.4 times that of the inner arc side quenching device, i.e., 1.36L / (m2·s). The total water flow rate of the first quenching zone is 125.2m3 / h. After the first quenching stage, the surface temperature of the continuously cast slab decreases to 385℃.

[0068] In one specific embodiment of this application, after the first stage of quenching, the length of the reheating zone is 4.0m, and in the reheating zone, the surface temperature of the continuously cast slab rises to 722℃.

[0069] In one specific embodiment of this application, a second-stage quenching is performed. The second-stage quenching length is 3.0 m, the water flow density for the inner arc side quenching is 2.7 L / (m²·s); the water flow density for the outer arc side quenching device is 1.5 times that of the inner arc side quenching device, i.e., 4.05 L / (m²·s); the water flow density for the two side quenching devices is 0.4 times that of the inner arc side quenching device, i.e., 1.08 L / (m²·s), and the total water flow rate in the second quenching zone is 99.4 m³ / h. Both the first and second-stage quenching use water nozzles, which are densely arranged along the width direction and the drawing direction of the continuously cast slab. After the second-stage quenching, the surface temperature of the slab is reduced to 413°C, and the final surface temperature of the slab entering the heating furnace is 692°C, which is lower than the Ar1 temperature of SPHC steel (716°C), thus avoiding the generation of hot-transfer cracks in the continuously cast slab.

[0070] Please refer to Figure 4 , Figure 4 This is an exemplary embodiment of the present application illustrating the surface temperature change trend of a continuously cast slab using a one-stage surface quenching method.

[0071] In one specific embodiment of this application, a control group is also set up using a one-stage online continuous casting billet surface quenching method. Under the premise of consistent implementation environment, only the quenching process is modified to a single quenching area, and the quenching water flow rate is adaptively increased. The water flow density on the inner arc side of the continuous casting billet is 7.0 L / (m2·s), the water flow density of the outer arc side quenching device is 1.5 times that of the inner arc side quenching device, i.e., 10.5 L / (m2·s), and the water flow density of the two side quenching devices is 0.4 times that of the inner arc side quenching device, i.e., 2.8 L / (m2·s). The total quenching water flow rate is 257.8 m3 / h. SPHC steel was subjected to one-stage online surface quenching according to the above method. During the quenching process, when the surface temperature of the continuously cast slab dropped below 400℃, the sprayed water changed from a nucleation boiling state to a contact state on the surface of the slab due to the low surface temperature. This reduced the heat transfer coefficient and heat flow, resulting in a slow decrease in the surface temperature of the continuously cast slab and a decrease in quenching efficiency. Furthermore, when the continuously cast slab entered the heating furnace, the surface temperature of the slab rose back to 734℃, which is higher than the Ar1 temperature of SPHC steel (716℃). This still led to the generation of hot-transfer cracks in the continuously cast slab.

[0072] according to Figure 3 and Figure 4 Furthermore, through comparison of data from the comparative group, it can be determined that the continuous casting billet surface quenching method proposed in this application has higher quenching efficiency compared with the existing one-stage continuous casting billet surface quenching method. It can solve the problem of insufficient one-stage surface quenching capability of continuous casting slabs under high casting speed, thereby controlling the generation of hot-feeding cracks in the billet.

[0073] An embodiment of the present invention provides a method for surface quenching of continuously cast slabs. The method involves cutting the continuously cast slab leaving the continuous casting machine to obtain a slab to be quenched. This slab is then conveyed into a first quenching zone for first-stage quenching, and the surface temperature after the first-stage quenching is controlled within a first preset temperature threshold range to obtain a first-quenched slab. The first-quenched slab is then conveyed into a reheating zone for reheating, resulting in a reheated first-quenched slab. Finally, the reheated first-quenched slab is subjected to a second quenching zone for second-stage quenching, and the surface temperature after the second-stage quenching is controlled within a second preset temperature threshold range to obtain a second-quenched slab. The slab is then transported to the heating furnace after secondary quenching. This method controls the quenching of the continuously cast slab at high casting speed by setting two quenching zones, which can effectively reduce the surface temperature of the slab to a suitable range. The addition of a reheating section between the quenching zones can reduce quenching stress. Other benefits include: the nozzles are densely arranged along the width and casting direction of the slab to ensure uniform cooling of the slab surface; the spraying method is more in line with the heat transfer law of continuous casting slab spraying, resulting in higher quenching efficiency and solving the problem of insufficient one-stage surface quenching capacity at high casting speed.

[0074] Embodiments of this application also provide an electronic device, including: one or more processors; and a storage device for storing one or more programs, which, when executed by one or more processors, enable the electronic device to implement an automated control method for the continuous casting billet surface quenching method provided in the above embodiments.

[0075] Figure 5 This is a schematic diagram illustrating the structure of a computer system for an electronic device, as shown in an exemplary embodiment of this application. It should be noted that... Figure 5 The computer system 500 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0076] like Figure 5 As shown, the computer system 500 includes a Central Processing Unit (CPU) 501, which can perform various appropriate actions and processes, such as executing the methods described in the above embodiments, based on a program stored in Read-Only Memory (ROM) 502 or a program loaded from storage into Random Access Memory (RAM) 503. The RAM 503 also stores various programs and data required for system operation. The CPU 501, ROM 502, and RAM 503 are interconnected via a bus. An Input / Output (I / O) interface 505 is also connected to the bus 504.

[0077] The following components are connected to I / O interface 505: an input section 506 including a keyboard, mouse, etc.; an output section 507 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section performs communication processing via a network such as the Internet. A drive is also connected to I / O interface 505 as needed. Removable media 511, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 510 as needed so that computer programs read from them can be installed into storage section 508 as needed.

[0078] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 509, and / or installed from removable medium 511. When the computer program is executed by central processing unit (CPU) 501, it performs various functions defined in the system of this application.

[0079] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0080] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0081] In the corresponding figures of the above embodiments, connecting lines can represent the connection relationship between various components, indicating more constitutive signal paths and / or one or more ends of some lines having arrows to indicate the main information flow direction. Connecting lines are an identifier and are not a limitation on the scheme itself, but rather the use of these lines in combination with one or more exemplary embodiments helps to more easily connect circuits or logic units. Any signal represented (determined by design requirements or preferences) can actually include one or more signals that can be transmitted in any direction and can be implemented in any suitable type of signal scheme.

[0082] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0083] Another aspect of this application provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the method as described above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not assembled into the electronic device.

[0084] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0085] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the method according to the embodiments of this application.

[0086] It should be noted that this application can be used in a wide range of general-purpose or special-purpose computing system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics devices, network PCs, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, etc.

[0087] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0088] It should be understood that the above content is only a preferred exemplary embodiment of this application and is not intended to limit the implementation of this application. Those skilled in the art can easily make corresponding modifications or alterations based on the main concept and spirit of this application. Therefore, the scope of protection of this application should be the scope of protection claimed in the claims.

Claims

1. A method for surface quenching of continuously cast billets, characterized in that, The surface quenching method for the continuously cast billet includes: The continuously cast slab leaving the continuous casting machine is cut to obtain a slab to be quenched. The blank to be quenched is conveyed into the first quenching area for the first stage of quenching, and the surface temperature of the blank to be quenched after the first stage of quenching is controlled within the first preset temperature threshold range to obtain a first-quenched blank, wherein the first preset temperature threshold range is 400±50 ℃. The first-quenched slab is conveyed into the reheating zone for reheating to obtain a reheated first-quenched slab. The reheating zone is located between the first quenching zone and the second quenching zone, and the length of the reheating zone ranges from 3 to 5 meters. The first-quenched slab after reheating is subjected to a second-stage quenching in the second quenching zone. The surface temperature of the first-quenched slab after the second-stage quenching is controlled within a second preset temperature threshold range to obtain a second-quenched slab. The second-quenched slab is then conveyed to a heating furnace. The first and second quenching zones are located on the same conveyor roller conveyor. The first and second quenching zones include an inner arc-side quenching device, an outer arc-side quenching device, and two-sided quenching devices. The water flow density of the outer arc-side quenching device in the first and second quenching zones is 1.4 to 1.6 times that of the inner arc-side quenching device, and the water flow density of the two-sided quenching devices is 0.3 to 0.5 times that of the inner arc-side quenching device. The second preset temperature threshold range is 400±50 ℃.

2. The method for surface quenching of continuously cast billets according to claim 1, characterized in that, The water flow density of the inner arc side quenching device in the first quenching region is 3.0~5.0 L / (m²•s).

3. The method for surface quenching of continuously cast billets according to claim 1, characterized in that, The water flow density of the inner arc side quenching device in the second quenching region is 2.0~4.0 L / (m²•s).

4. The method for surface quenching of continuously cast billets according to any one of claims 2-3, characterized in that, The quenching water flow rate in the first or second quenching zone is determined based on the following calculation formula: This represents the water flow rate in the i-th quenching zone, in m³ / h. The water flow density of the quenching device on the inner arc side in the quenching region of segment i is expressed in L / (m²·s). This represents the length of the i-th quenching region, in meters. b represents the width of the slab to be quenched, in meters (m). h represents the thickness of the slab to be quenched, in meters (m); i represents the i-th quenching zone.

5. The method for surface quenching of continuously cast billets according to claim 1, characterized in that, The distance between the first quenching zone and the continuous casting machine is 3 to 5 meters.

6. The method for surface quenching of continuously cast billets according to claim 1, characterized in that, The length of the first quenching zone is 2~4 m.

7. The method for surface quenching of continuously cast billets according to claim 1, characterized in that, The length of the second quenching zone is 2~4 m.

Images