Method, device, equipment and medium for judging solidification progress of cast blank when leaving crystallizer
By analyzing the changes in carbon content of continuously cast billets and the electromagnetic stirring and scouring mechanism of the crystallizer, the minimum carbon content was used to determine the thickness of the billet shell, thus solving the problem of thickness judgment deviation when exiting the crystallizer and improving the accuracy of continuous casting quality and process optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INST OF RES OF IRON & STEEL JIANGSU PROVINCE
- Filing Date
- 2024-01-23
- Publication Date
- 2026-06-19
AI Technical Summary
In the existing technology, there is a large deviation in judging the thickness of the billet shell when exiting the crystallizer, which affects the accuracy of continuous casting equipment and process design, resulting in defects such as increased surface temperature of the billet, cracks caused by thermal stress, or bulging of the billet.
By obtaining the carbon content variation of the continuously cast billet in the thickness direction, and combining it with the scouring mechanism of the solidification front by electromagnetic stirring in the crystallizer, the minimum carbon content is used to determine the billet shell thickness in the crystallizer, thereby improving the continuous casting quality and optimizing the process.
It improves the accuracy of billet shell thickness determination, reduces errors caused by diffusion, and improves continuous casting quality and process optimization effects.
Smart Images
Figure CN117920960B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of continuous casting technology, specifically to a method, apparatus, equipment, and medium for judging the solidification process of a cast billet when it exits the crystallizer. Background Technology
[0002] The thickness of the billet shell exiting the crystallizer is a crucial issue in the design of continuous casting equipment and processes. If the shell is too thick, it means the surface temperature of the shell is generally too low upon exiting the crystallizer, leading to increased surface warming and greater thermal stress, which can cause cracks. If the shell is too thin, it can easily cause shape defects such as bulging of the billet, and in severe cases, even lead to leakage. Determining the thickness of the billet shell upon exiting the crystallizer is essential for correcting the solidification heat transfer model of continuous casting, determining the crystallizer cooling regime, designing the spacing between the casting machine's foot rolls, and even optimizing subsequent cooling intensity.
[0003] The following methods can be used to determine the thickness of the billet shell exiting the crystallizer: the molten steel shell leakage method, the tracer method, and the simulation calculation method. The molten steel shell leakage method uses a ruler to directly measure the shell thickness at different heights within the crystallizer. However, during the leakage process, residual molten steel inside the crystallizer continues to solidify on the shell, causing the leaked shell thickness to be greater than the actual shell thickness inside the crystallizer. The tracer method mainly includes the radioactive tracer method and the chemical tracer method. The radioactive tracer method involves using Au... 198 The tracer is added to the crystallizer and diffused into the unsolidified molten steel. The billet is dissected and the distribution of the tracer is measured to determine the billet shell thickness at the time of tracer addition. Due to Au... 198 It is radioactive and harmful to human health, and is no longer used. The chemical tracer method involves adding FeS to the crystallizer; after the molten steel has completely solidified, the thickness distribution of the billet shell within the crystallizer is obtained using the sulfur printing method. Because FeS still diffuses to varying degrees in the two-phase region, the determination of the billet shell thickness still has a significant margin of error. The simulation calculation method uses the finite element method to establish a model, simulating the temperature field of the continuously cast billet under different heat transfer boundary conditions, combining the thermodynamic properties of the steel grade itself, and then verifying the solidification heat transfer model based on the measured thickness of the billet shell. Given the inaccuracy of the measured thickness, the solidification heat transfer model naturally has a large error. Because elements still diffuse to varying degrees in different solid fraction ranges, the method of determining the billet shell thickness based on element distribution has a significant bias. Summary of the Invention
[0004] In view of this, the present invention provides a method, apparatus, equipment and medium for judging the solidification process of the billet when exiting the crystallizer, so as to solve the problem of large deviation in the judgment of the billet shell thickness when exiting the crystallizer.
[0005] In a first aspect, the present invention provides a method for judging the solidification process of a continuously cast billet when it exits the crystallizer. The method includes: obtaining the change in carbon content of the continuously cast billet in the thickness direction; determining the billet shell thickness when exiting the crystallizer based on the scouring mechanism of the solidification front by electromagnetic stirring in the crystallizer and the minimum carbon content; and determining the solidification process of the continuously cast billet based on the billet shell thickness.
[0006] The method for determining the solidification process of the billet exiting the crystallizer provided in this invention analyzes the variation law of carbon content in the thickness direction of the continuously cast billet and combines it with the scouring mechanism of the solidification front by electromagnetic stirring in the crystallizer. The method determines the billet shell thickness at the time of exiting the crystallizer from the minimum value of carbon content, which plays an important role in improving continuous casting quality and optimizing the process. Furthermore, compared with the problem of deviation caused by diffusion in related technologies, this method improves the accuracy of thickness determination by determining the billet shell thickness through the carbon content of the continuously cast billet itself and its variation law.
[0007] In one optional implementation, obtaining the carbon content variation of the continuously cast billet in the thickness direction includes: based on the low-magnification pickling process of the continuously cast billet, performing low-magnification sampling and pickling rating on the continuously cast billet, and milling the cross-section of the low-magnification pickled billet to a bright finish; cutting the milled and brightened continuous cast billet to obtain samples in the thickness direction; measuring the carbon content of the samples in each thickness direction to obtain the carbon content at each thickness.
[0008] In this embodiment, samples in the thickness direction were obtained by low-magnification pickling and cutting of the continuously cast billet, thus providing a basis for obtaining the carbon content corresponding to different thicknesses.
[0009] In one optional embodiment, the continuously cast billet with a bright cross-section is cut to obtain a sample in the thickness direction, including: cutting a long strip sample in the thickness direction from the middle position of the continuously cast billet with a bright cross-section; cutting the long strip sample into sub-samples of the same length; using the sub-samples as samples in the thickness direction; and recording the distance between the center of each sub-sample and the surface, where the distance is the thickness of the sub-sample.
[0010] In this embodiment, a long strip sample is first obtained by cutting the long strip sample, and then the long strip sample is cut into sub-samples, thereby providing a basis for determining the thickness.
[0011] In one optional embodiment, the long strip sample is selected from any side of the low magnification section of the continuously cast billet. The length of the long strip sample is 20mm to 60mm, the length of the sub-sample is 1mm to 3mm, and the mass of the sub-sample is 0.1g to 0.3g.
[0012] In this embodiment, by setting the length of the long strip sample to 20mm to 60mm, the long strip sample can include the negative segregation positions caused by the electromagnetic stirring of the crystallizer, thus providing a data basis for obtaining the minimum carbon content; by setting the length of the sub-sample to 1mm to 3mm, the sampling density can be increased, and it is also convenient to analyze the trend of carbon content change.
[0013] In one optional implementation, measuring the carbon content of the sample in each thickness direction to obtain the carbon content at each thickness includes: measuring the carbon content of the sample at the same distance a preset number of times to obtain measurement results; extracting the measurement results that meet a preset error from the measurement results; and determining the carbon content at each thickness based on the average value of the measurement results that meet the preset error at the same distance.
[0014] In this embodiment, by performing a preset number of measurements on the sample and using the average value of the measurement results that meet the preset error as the carbon content for each thickness, the accuracy of the carbon content variation is improved, thereby further improving the accuracy of the determined blank thickness.
[0015] In one alternative embodiment, the crystallizer electromagnetic stirrer is installed on the periphery of the crystallizer, and the lower opening of the electromagnetic stirrer is flush with the lower opening of the crystallizer.
[0016] In this embodiment, by setting the installation position of the electromagnetic stirrer, the electromagnetic stirring effect can be better utilized. At the same time, it can be ensured that after exiting the crystallizer, the molten steel at the solidification front is freed from the electromagnetic stirring effect, so that the solute elements are redistributed in the solid and liquid phases and accumulate at the solidification front.
[0017] In one alternative implementation, the carbon content is measured using a carbon-sulfur analyzer.
[0018] In this embodiment, the carbon content is measured using a carbon-sulfur analyzer, providing a data basis for determining the carbon content.
[0019] Secondly, the present invention provides a device for judging the solidification process of a continuously cast billet when it exits the crystallizer. The device includes: a change acquisition module for acquiring the change in carbon content of the continuously cast billet in the thickness direction; a thickness determination module for determining the thickness of the billet shell when exiting the crystallizer based on the scouring mechanism of the solidification front by electromagnetic stirring in the crystallizer and the minimum value of carbon content; and a process judgment module for determining the solidification process of the continuously cast billet based on the thickness of the billet shell.
[0020] Thirdly, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method for determining the solidification process of the billet when exiting the crystallizer as described in the first aspect or any corresponding embodiment above.
[0021] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the method for determining the solidification process of a cast billet when exiting the crystallizer as described in the first aspect or any corresponding embodiment above. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 This is a flowchart illustrating a method for determining the solidification process of a cast billet when exiting the crystallizer according to an embodiment of the present invention.
[0024] Figure 2 This is a schematic diagram of sampling a continuous casting billet strip sample according to an embodiment of the present invention;
[0025] Figure 3 This is a schematic diagram illustrating the variation of carbon content in the thickness direction of a continuously cast billet according to an embodiment of the present invention.
[0026] Figure 4 This is a structural block diagram of a device for determining the solidification process of a cast billet when exiting the crystallizer according to an embodiment of the present invention;
[0027] Figure 5 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] According to an embodiment of the present invention, a method for determining the solidification process of a billet when exiting the crystallizer is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.
[0030] This embodiment provides a method for determining the solidification process of a cast billet when it exits the crystallizer, which can be used in electronic devices such as computers, mobile phones, and tablets. Figure 1 This is a flowchart of a method for determining the solidification process of a cast billet when exiting the crystallizer according to an embodiment of the present invention, as shown below. Figure 1 As shown, the process includes the following steps:
[0031] Step S101: Obtain the carbon content variation in the thickness direction of the continuously cast billet. Specifically, the carbon content variation in the thickness direction refers to the carbon content corresponding to different thicknesses, that is, this variation can be represented by a curve with thickness as the horizontal axis and carbon content as the vertical axis. The thickness can be determined as follows: using a surface in the thickness direction of the continuously cast billet as a reference plane, the distance between different positions in the thickness direction of the continuously cast billet and this reference plane is the thickness.
[0032] Step S102: Based on the scouring mechanism of the solidification front caused by electromagnetic stirring in the crystallizer, the shell thickness in the crystallizer is determined according to the minimum carbon content. Electromagnetic stirring refers to improving and eliminating superheat in the molten steel within the crystallizer through the generated electromagnetic force, which can increase the equiaxed crystal ratio of the billet, resulting in a billet with a good solidification structure, thereby improving the performance of the finished product. The essence of electromagnetic stirring is to enhance the movement of molten steel within the liquid phase cavity of the billet by using the electromagnetic force induced in the liquid phase cavity, thereby enhancing the convection, heat transfer, and mass transfer processes of the molten steel, and thus controlling the solidification process of the billet. In this embodiment, the electromagnetic stirrer is installed on the periphery of the crystallizer, and the lower opening of the electromagnetic stirrer is flush with the lower opening of the crystallizer, which can better improve the surface quality of the continuously cast billet and reduce internal defects in the continuously cast billet.
[0033] Specifically, electromagnetic stirring induces forced flow of molten steel, flushing out the liquid phase rich in solute between dendrites. This results in negative segregation of solute elements at the solidification front, leading to a decreasing trend. Furthermore, the bottom of the crystallizer and the bottom of the electromagnetic stirrer are essentially flush. After exiting the crystallizer, the unsolidified molten steel at the solidification front is freed from the electromagnetic stirring, causing the solute elements to redistribute in the solid-liquid phase and accumulate at the solidification front, resulting in an increasing content. Therefore, the thickness of the continuously cast billet shell at the time of exiting the crystallizer can be determined based on the minimum carbon content. Specifically, finding the minimum carbon content from the carbon content variation reveals the thickness corresponding to this minimum carbon content, which is the billet shell thickness at the time of exiting the crystallizer.
[0034] Step S103: Determine the solidification process of the continuously cast billet based on the billet shell thickness. Specifically, the solidification process information of the continuously cast billet can be obtained very intuitively through this billet thickness value.
[0035] The method for determining the solidification process of the billet exiting the crystallizer provided in this invention analyzes the variation law of carbon content in the thickness direction of the continuously cast billet and combines it with the scouring mechanism of the solidification front by electromagnetic stirring in the crystallizer. The method determines the billet shell thickness at the time of exiting the crystallizer from the minimum value of carbon content, which plays an important role in improving continuous casting quality and optimizing the process. Furthermore, compared with the problem of deviation caused by diffusion in related technologies, this method improves the accuracy of thickness determination by determining the billet shell thickness through the carbon content of the continuously cast billet itself and its variation law.
[0036] This embodiment provides a method for determining the solidification process of the cast billet when it exits the crystallizer. The process includes the following steps:
[0037] Step S201: Obtain the change in carbon content in the thickness direction of the continuously cast billet.
[0038] Specifically, step S201 includes:
[0039] Step S2011: Based on the low-magnification pickling process of the continuously cast billet, the continuously cast billet is sampled and pickled at low magnification, and the cross-section of the pickled billet is milled and polished. Specifically, the low-magnification pickling process includes cutting a sample from the continuously cast billet, using acid immersion to display the internal microstructure of the cross-section or longitudinal section of the billet, and then checking whether the defects in the cross-section of the billet are within the allowable range. If they are within the allowable range, the cross-section after low-magnification pickling is milled and polished.
[0040] Step S2012 involves cutting the milled and polished continuous casting billet to obtain samples in the thickness direction. Specifically, during cutting, a long strip sample in the thickness direction is first cut from the middle of the milled and polished continuous casting billet; then, the long strip sample is cut into individual samples of the same length. These individual samples are used as samples in the thickness direction, and the distance between the center of each individual sample and the surface is recorded, with the distance representing the thickness of the individual sample. The long strip sample is selected from any side of the low-magnification section of the continuous casting billet, with a length of 20mm to 60mm. The individual samples have a length of 1mm to 3mm and a mass of 0.1g to 0.3g.
[0041] It should be noted that for small square billets, the shell thickness at the time of exiting the crystallizer is generally above 10mm, meaning that the negative segregation position caused by electromagnetic stirring in the crystallizer is above 10mm. To include this position, the length of the long strip sample is 20mm to 60mm; the length of the sub-sample is 1mm to 3mm, which can increase the sampling density and analyze the trend of carbon content variation from the surface to the center in the steel. When using a carbon-sulfur analyzer to measure carbon content, the weight of the sample to be tested needs to be greater than or equal to 0.1g. Therefore, the mass of the sub-sample is 0.1g to 0.3g.
[0042] Step S2013: Measure the carbon content of the sample in each thickness direction to obtain the carbon content at each thickness. Specifically, a carbon-sulfur analyzer can be used to measure the carbon content. During measurement, the carbon content of sub-samples at the same distance is measured a preset number of times to obtain the measurement results; the measurement results that meet the preset error are extracted; the carbon content at each thickness is determined based on the average value of the measurement results that meet the preset error at the same distance. For example, when using a carbon-sulfur analyzer to measure the carbon content, sub-samples at the same distance from the surface are measured at least 3 times to ensure that at least two errors are within 2%, and the average value of the data with errors within 2% is taken as the carbon content at that location.
[0043] Step S202: Based on the scouring mechanism of the solidification front caused by electromagnetic stirring in the crystallizer, the shell thickness in the crystallizer is determined according to the minimum carbon content. For details, please refer to [link to relevant documentation]. Figure 1 Step S102 of the illustrated embodiment will not be described again here.
[0044] Step S203: Determine the solidification process of the continuously cast billet based on the billet shell thickness; for details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.
[0045] As a specific application embodiment of the present invention, the method for judging the solidification process of the cast billet when exiting the crystallizer is implemented through the following process: First, obtain the continuously cast billet for which the solidification process needs to be judged. For example, the obtained continuously cast billet has a cross-section of 140mm×140mm, the cast steel grade is 70# steel, the temperature is 1500℃, the casting speed is 2.7m / min, the crystallizer cooling water flow rate is 1750L / min, and the secondary cooling water flow rate is 1.5L / kg. Take a cross-section of the obtained continuously cast billet at low magnification, and the pickling rating is 0.5 grade for central porosity and no cracks. Figure 2 As shown, the acid-washed low-magnification surface was milled to a bright finish, and a long strip sample with a length of 30 mm was cut from the middle of the left side. The long strip sample was then cut into sub-samples with a length of 2 mm, and the distance between the center of each sub-sample and the surface was recorded.
[0046] Each sample weighed approximately 0.2g, and its carbon content was measured using a carbon-sulfur analyzer. Samples at the same distance from the surface were measured at least three times to ensure that at least two measurements had an error within 2%. The average value of the data with an error within 2% was taken as the carbon content at that location. The final carbon content variation along the thickness direction of the continuously cast billet is shown in the figure below. Figure 3As shown, electromagnetic stirring causes forced flow of molten steel, washing away the liquid phase enriched with solute between dendrites, resulting in negative segregation of solute elements at the solidification front. After exiting the crystallizer, the uncooked molten steel at the solidification front is freed from the electromagnetic stirring, and the solute elements redistribute in the solid and liquid phases and accumulate at the solidification front, causing their content to increase. Therefore, based on the minimum carbon content, the thickness of the continuously cast billet shell in the crystallizer can be determined to be 11 mm, and the solidification process can be judged based on this shell thickness.
[0047] The method for judging the solidification process of the billet when exiting the crystallizer provided in this embodiment is simple to operate in terms of sampling and analysis process, and does not require adjustment of equipment conditions and process parameters, so it has no impact on the production status of the workshop. The method can indirectly judge the thickness of the continuous casting billet shell when exiting the crystallizer based on the element distribution state, which plays an important role in improving the quality of continuous casting and optimizing the process.
[0048] This embodiment also provides a device for determining the solidification process of the billet when exiting the crystallizer. This device is used to implement the above embodiments and preferred embodiments, and will not be repeated as already described. As used below, the term "module" can be a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.
[0049] This embodiment provides a device for determining the solidification process of the cast billet when it exits the crystallizer, such as... Figure 4 As shown, it includes:
[0050] The change acquisition module 41 is used to acquire the change in carbon content of the continuously cast billet in the thickness direction;
[0051] Thickness determination module 42 is used to determine the shell thickness in the crystallizer based on the scouring mechanism of the solidification front by electromagnetic stirring in the crystallizer and the minimum carbon content.
[0052] The process judgment module 43 is used to determine the solidification process of the continuously cast billet based on the thickness of the billet shell.
[0053] In one optional implementation, the variation acquisition module includes: a low-magnification pickling module, used to perform low-magnification sampling and pickling rating on the continuous casting billet based on the low-magnification pickling process, and to mill the cross-section of the low-magnification pickled billet until it is bright; a cutting module, used to cut the milled and brightened continuous casting billet to obtain a sample in the thickness direction; and a measurement module, used to measure the carbon content of the sample in each thickness direction to obtain the carbon content at each thickness.
[0054] In one optional implementation, the cutting module is specifically used to: cut a long strip sample in the thickness direction from the middle position of the continuously cast billet with a bright cross-section; cut the long strip sample into sub-samples of the same length, use the sub-samples as samples in the thickness direction, and record the distance between the center of each sub-sample and the surface, the distance being the thickness of the sub-sample.
[0055] In one optional embodiment, the long strip sample is selected from any side of the low magnification section of the continuously cast billet. The length of the long strip sample is 20mm to 60mm, the length of the sub-sample is 1mm to 3mm, and the mass of the sub-sample is 0.1g to 0.3g.
[0056] In one optional implementation, the measurement module is specifically used to: measure the carbon content of sub-samples at the same distance a preset number of times to obtain measurement results; extract the measurement results that meet the preset error from the measurement results; and determine the carbon content at each thickness based on the average value of the measurement results that meet the preset error at the same distance.
[0057] In one alternative embodiment, the crystallizer electromagnetic stirrer is installed on the periphery of the crystallizer, and the lower opening of the electromagnetic stirrer is flush with the lower opening of the crystallizer.
[0058] In one alternative implementation, the carbon content is measured using a carbon-sulfur analyzer.
[0059] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.
[0060] This invention also provides a computer device having the above-described features. Figure 4 The device shown is for judging the solidification process of the billet when it exits the crystallizer.
[0061] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 5 As shown, the computer device includes one or more processors 10, memory 20, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5Take a processor 10 as an example.
[0062] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.
[0063] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.
[0064] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device as shown by a landing page for an app. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, which can be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
[0065] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.
[0066] The computer device also includes a communication interface 30 for communicating with other devices or communication networks.
[0067] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.
[0068] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A method for determining the solidification process of a cast billet upon exiting the crystallizer, characterized in that, The method includes: Obtain the carbon content change in the thickness direction of the continuously cast billet; Obtain the carbon content change of the continuously cast billet in the thickness direction, including: Based on the low-magnification pickling process of continuous casting billets, the continuous casting billets are sampled and pickled at low magnification and rated. The cross-section of the low-magnification pickled billet is then milled and polished. The continuously cast billet with a bright cross-section is cut to obtain a sample in the thickness direction; The carbon content of the sample is measured in each thickness direction to obtain the carbon content at each thickness. The continuously cast billet with a bright cross-section is cut to obtain a sample in the thickness direction, including: A long strip sample along the thickness direction is cut from the middle position of the continuously cast billet with a smooth cross-section milled. The long strip sample is cut into sub-samples of the same length. The sub-samples are used as samples in the thickness direction, and the distance between the center of each sub-sample and the surface is recorded. The distance is the thickness of the sub-sample. The carbon content of the sample is measured in each thickness direction to obtain the carbon content at each thickness, including: The carbon content of sub-samples at the same distance is measured a predetermined number of times to obtain the measurement results; Extract the measurement results that satisfy the preset error from the measurement results; The carbon content at each thickness is determined based on the average of the measurement results that meet the preset error at the same distance. Based on the scouring mechanism of the solidification front by the electromagnetic stirring of the crystallizer, the thickness of the billet shell in the crystallizer is determined according to the minimum carbon content; the electromagnetic stirrer of the crystallizer is installed on the outside of the crystallizer, and the lower opening of the electromagnetic stirrer is flush with the lower opening of the crystallizer. The solidification process of the continuously cast billet is determined based on the thickness of the billet shell.
2. The method of claim 1, wherein, The long strip sample is selected from any side of the low magnification section of the continuously cast billet. The length of the long strip sample is 20mm to 60mm, the length of the sub-sample is 1mm to 3mm, and the mass of the sub-sample is 0.1g to 0.3g.
3. The method of claim 1, wherein, The carbon content was measured using a carbon-sulfur analyzer.
4. A device for judging the solidification process of a cast billet when exiting the crystallizer, characterized in that, A method for determining the solidification process of a cast billet upon exiting the crystallizer as described in any one of claims 1 to 3, the apparatus comprising: The change acquisition module is used to acquire the change in carbon content of the continuously cast billet in the thickness direction; The thickness determination module is used to determine the shell thickness in the crystallizer based on the scouring mechanism of the solidification front by electromagnetic stirring in the crystallizer and the minimum carbon content. The process determination module is used to determine the solidification process of the continuously cast billet based on the thickness of the billet shell.
5. A computer device, comprising: include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the method for determining the solidification process of the billet when exiting the crystallizer as described in any one of claims 1 to 3.
6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the method for determining the solidification process of the billet when exiting the crystallizer as described in any one of claims 1 to 3.