Control method of molten steel inclusions and related equipment

Abstract

The invention discloses a molten steel inclusion control method and related equipment, and relates to the technical field of continuous casting, and the method comprises the steps that steel grade information of casting steel is obtained; and the steel grade corresponding to the steel grade information is cast, pulse current is applied to molten steel, and a casting blank is obtained. The inclusions in the molten steel are regulated and controlled through the pulse current technology, the large-size inclusions can be effectively removed, the small-size inclusions are refined, the cleanliness of the molten steel is improved, and the mechanical property of a cold-rolled product can be improved.

Description

Technical Field

[0001] This application relates to the field of continuous casting technology, and particularly to a method for controlling inclusions in molten steel and related equipment. Background Art

[0002] With the continuous development of iron and steel metallurgy technology, the quality requirements for iron and steel products are getting higher and higher. Especially for cold-rolled products, their mechanical properties directly affect the service performance and lifespan of steel. Traditional molten steel treatment technologies usually improve the properties of steel by adding a large amount of alloying elements or using complex chemical methods. However, this method not only increases production costs but also may cause certain pollution to the environment.

[0003] In recent years, the application of pulsed current technology in the field of metal smelting has gradually received attention. It has been found that pulsed current can act on inclusions in molten steel through the electric field force, promoting the floating, refinement, and removal of inclusions, thereby improving the cleanliness of molten steel and enhancing the mechanical properties of the final product. Therefore, there is an urgent need for a method for controlling inclusions in molten steel to solve the above-mentioned problems. Summary of the Invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further elaborated in the Detailed Description section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] In a first aspect, this application provides a method for controlling inclusions in molten steel, including:

[0006] Obtaining the steel grade information of the casting steel;

[0007] Casting the steel corresponding to the above steel grade information and applying a pulsed current to the molten steel to obtain a billet.

[0008] In some embodiments, the above pulsed current is generated based on a current loop formed by a power source, a positive electrode assembly, a negative electrode assembly, and the above molten steel.

[0009] In some embodiments, the above negative electrode assembly includes:

[0010] A negative electrode material, which is a conductive refractory material and is in contact with the above molten steel;

[0011] A negative electrode clip, which is arranged at the tail of the above negative electrode material and is not in contact with the above molten steel.

[0012] In some embodiments, the above positive electrode assembly includes:

[0013] Submerged nozzle, the above-mentioned submerged nozzle introduces the above-mentioned molten steel from the tundish into the mold;

[0014] External connecting wire column, the above-mentioned external connecting wire column is embedded on the outer wall of the above-mentioned submerged nozzle.

[0015] In some embodiments, it further includes:

[0016] Determine the liquidus temperature based on the steel grade corresponding to the above-mentioned steel grade information;

[0017] Determine the superheat range based on the above-mentioned liquidus temperature and the actual temperature of the above-mentioned molten steel;

[0018] Adjust the parameters of the pulsed current based on the above-mentioned superheat range.

[0019] In some embodiments, it further includes:

[0020] After obtaining the billet, detect the size and morphology of the inclusions in the billet, and classify the above-mentioned inclusions into first-class inclusions and second-class inclusions, wherein the above-mentioned first-class inclusions are those with a particle size greater than or equal to the first diameter, and the above-mentioned second-class inclusions are those with a particle size less than the first diameter;

[0021] Based on the detection results, determine the parameters of the pulsed current corresponding to different types of inclusions for application in subsequent casting cycles.

[0022] In some embodiments, it further includes:

[0023] Before the start of casting, after confirming that the initial parameters are correct, start the power supply, run for a preset time and judge whether the average pulsed current value is normal;

[0024] During the casting process, when the casting drawing speed reaches the preset target drawing speed, dynamically adjust the parameters of the above-mentioned pulsed current based on the characteristics of the above-mentioned steel grade and the real-time casting situation;

[0025] After the casting is completed, stop the output of the above-mentioned pulsed current and disconnect the power supply connection.

[0026] In a second aspect, the present application proposes a control device for molten steel inclusions, including:

[0027] Steel grade acquisition unit, used to acquire the steel grade information of the steel to be cast;

[0028] Casting control unit, used to cast the steel corresponding to the above-mentioned steel grade information and apply a pulsed current to the molten steel to obtain a billet.

[0029] In a third aspect, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor is configured to implement the steps of the method for controlling inclusions in molten steel according to any one of the first aspects when executing the computer program stored in the memory.

[0030] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for controlling inclusions in molten steel according to any one of the first aspects is implemented.

[0031] In summary, the present application precisely regulates inclusions in molten steel through pulse current technology, can effectively remove large-sized inclusions, and refine small-sized inclusions, thereby improving the cleanliness of molten steel. This method does not require additional alloying elements or the use of harmful chemicals, reducing production costs and avoiding pollutant emissions. By directly treating the molten steel through the current loop, the mechanical properties of cold-rolled products can be improved, especially significantly enhancing aspects such as elongation and tensile strength. At the same time, it solves the surface defects and stress concentration problems caused by inclusions, promoting the realization of green and low-carbon production. Description of the Drawings

[0032] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this specification. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0033] Figure 1 It is a schematic flowchart of a method for controlling inclusions in molten steel provided by an embodiment of the present application;

[0034] Figure 2 It is a schematic diagram of the electric field energization structure provided by an embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of the structure of a device for controlling inclusions in molten steel provided by an embodiment of the present application;

[0036] Figure 4 It is a schematic diagram of the structure of an electronic device for controlling inclusions in molten steel provided by an embodiment of the present application. Detailed Embodiments

[0037] In the description and claims of this application and the above-mentioned drawings, terms such as "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments.

[0038] Please refer to Figure 1 , which is a schematic flow diagram of a method for controlling inclusions in molten steel provided by an embodiment of this application, and specifically may include:

[0039] S110. Obtain the steel grade information of the cast steel;

[0040] Exemplarily, obtaining the steel grade information of the cast steel is the first step of the method for controlling inclusions in molten steel of the present invention and also a basic link in the whole process. The steel grade information includes key parameters such as the chemical composition, physical properties of the molten steel, and the characteristics of the steel grade. This information is crucial for the subsequent pulse current application strategy and inclusion control because the chemical composition and physical properties of different steel grades will directly affect the fluidity of the molten steel, the distribution of inclusions, and their response behavior in the electric field. For example, the types and contents of alloying elements in different steel grades are different, which will lead to differences in the viscosity and conductivity of the molten steel, thus affecting the application effect of the pulse current. Therefore, accurately obtaining the steel grade information before treating the molten steel can provide data support and theoretical basis for formulating appropriate pulse current parameters and optimizing the treatment process.

[0041] S120. Cast the steel grade corresponding to the above steel grade information and apply a pulse current to the molten steel to obtain a billet.

[0042] Exemplarily, after obtaining the steel grade information, the next step is to cast the molten steel according to this information and apply a pulsed current, finally obtaining a billet. The casting process is to introduce the liquid steel from the tundish into the mold through the submerged nozzle. During this process, the molten steel gradually cools and solidifies to form a billet. Different steel grades will exhibit different fluidity, solidification characteristics, and inclusion distribution characteristics during the casting process, which requires full consideration of the characteristics of the steel grade during casting. By optimizing the casting process according to the steel grade information, the smooth progress of the casting process can be ensured and ideal billet quality can be obtained.

[0043] The purpose of applying the pulsed current is to control and optimize the inclusions in the molten steel, especially to reduce or remove the large-size inclusions in the molten steel. The pulsed current acts on the inclusions in the molten steel through the current loop. Under the action of the electric field force, the inclusions will be affected by the electromagnetic force. The larger inclusions will be promoted to float up, and the smaller inclusions may be refined or evenly distributed. The application process of the pulsed current is synchronized with the casting process. During the flow and solidification process of the molten steel, the application of the pulsed current can effectively adjust the size and distribution of the inclusions, thereby improving the cleanliness of the molten steel and the mechanical properties of the billet.

[0044] S130. Inspect and analyze the above billet, and detect the mechanical property results of the steel coil corresponding to the billet.

[0045] Exemplarily, inspecting and analyzing the billet is a key step to ensure the treatment effect of the molten steel and the quality of the billet. The billet inspection mainly conducts a detailed analysis on aspects such as the surface quality, microstructure, and mechanical properties of the billet, so as to evaluate the removal and refinement effects of the pulsed current on the inclusions in the molten steel. After the billet is treated with the pulsed current, the distribution, size, and quantity of its inclusions should change significantly. Therefore, inspecting and analyzing the billet can directly reflect the quality of the pulsed current control effect.

[0046] By evaluating the mechanical property results of the steel coil corresponding to the billet, the influence of the pulsed current treatment on the final product can be further verified. Specifically, the mechanical property test mainly includes the determination of indexes such as yield strength, tensile strength, elongation, and hardness. These mechanical property parameters reflect the overall quality and service performance of the steel. Especially the tensile strength and yield strength directly affect the processing performance and service life of cold-rolled products. If the pulsed current can effectively remove large-size inclusions, refine small-size inclusions, and optimize their distribution, the mechanical properties of the steel will be significantly improved.

[0047] In some instances, the above pulsed current is generated based on a current loop formed by a power source, a positive electrode component, a negative electrode component, and the above molten steel.

[0048] The above negative electrode component includes:

[0049] The negative electrode assembly, where the negative electrode material is a conductive refractory material and is in contact with the molten steel;

[0050] The negative electrode clip, which is arranged at the tail of the negative electrode material and is not in contact with the molten steel.

[0051] The above-mentioned positive electrode assembly includes:

[0052] The submerged entry nozzle, which introduces the molten steel from the tundish into the mold;

[0053] The external wire column, which is embedded on the outer wall of the submerged entry nozzle.

[0054] Exemplarily, the application of the pulsed current depends on a complete current loop, which is jointly constituted by the power supply, the positive electrode assembly, the negative electrode assembly and the molten steel. The power supply, as the core component providing the current, introduces the current into the molten steel through the positive electrode assembly at its output end, while the negative electrode assembly is connected to the molten steel through the current loop to ensure the closure and stable transmission of the current. The application of the pulsed current causes the inclusions in the molten steel to be affected by the electric field force, resulting in the effects of removal, refinement and uniform distribution, thereby improving the cleanliness of the molten steel and the quality of the casting billet.

[0055] The core part of the negative electrode assembly is the negative electrode material, which is a conductive refractory material that can be in direct contact with the molten steel and maintain stable conductivity under high-temperature conditions. The role of the negative electrode material is to transmit the current from the power supply to the molten steel, and by contacting the molten steel, apply the electromagnetic force to the inclusions in the molten steel, thereby promoting the floating or refinement of the inclusions. The design of the negative electrode clip enables it to stably fix the negative electrode material in the tundish, but the negative electrode clip is not in direct contact with the molten steel. Its role is to ensure the stability of the electrical connection and avoid wear or damage caused by direct contact with the molten steel.

[0056] The positive electrode assembly includes a submerged entry nozzle and an external wire column. The submerged entry nozzle is connected to the positive terminal of the power supply through the external wire column to ensure that the current can be transmitted from the power supply through the nozzle to the molten steel. The external wire column is embedded in the outer wall of the submerged entry nozzle and forms a complete current loop by electrically connecting the power supply and the nozzle. This design enables the current to be effectively transmitted to the molten steel and promotes the directional movement and removal of inclusions in the molten steel, thereby improving the mechanical properties and surface quality of the casting billet.

[0057] In the embodiments of the present application, the submerged nozzle is used to introduce molten steel from the tundish into the mold, while controlling the flow direction and speed of the molten steel, reducing the turbulence and secondary oxidation of the molten steel. The submerged nozzle serves as the positive electrode of the energizing device to introduce current into the molten steel. It realizes the application of pulsed current by connecting to the positive electrode of the power supply system. The external wire column is the electrical connection point, usually installed and embedded on the outer wall of the submerged nozzle. Its function is to connect the positive electrode interface of the power supply device to the submerged nozzle. The wire column is the medium or bridge for transmitting current from the power supply to the submerged nozzle. The positive electrode interface, as a contact point at the output end of the power supply device, is used to transmit the positive current. The positive electrode interface is connected to the wire column through a wire, and then the current is transmitted to the submerged nozzle through the wire column. The conductive refractory material (refractory rod) is embedded at a specific position in the molten steel inside the tundish and serves as the negative part of the energizing circuit. The negative clip is used to connect the negative electrode of the external power supply to the refractory rod. The negative clip is designed to clamp the tail of the conductive refractory material to ensure good electrical contact between the two, thereby ensuring the stability of current transmission. The negative electrode interface is the negative output end of the pulsed current generator or power supply system and is connected to the negative clip through a cable. This interface is responsible for transmitting current from the power supply to the entire system and finally reaching the refractory rod to form a complete current loop.

[0058] In some examples, it further includes:

[0059] Determine the liquidus temperature based on the steel grade corresponding to the above steel grade information;

[0060] Determine the superheat range based on the above liquidus temperature and the actual temperature of the molten steel;

[0061] Adjust the parameters of the pulsed current based on the above superheat range.

[0062] Exemplarily, according to the specific information of the steel grade, determine its corresponding liquidus temperature. The liquidus temperature refers to the temperature at which the molten steel begins to change from the liquid state to the solid state, and it is the demarcation point between the liquid phase and the solid phase during the cooling process of the steel grade. Different steel grades have different liquidus temperatures, so this temperature must be accurately calculated according to the characteristics of the steel grade. Based on this liquidus temperature, further, the difference between the actual temperature of the molten steel and the liquidus temperature, that is, the superheat, can be calculated. The superheat is the part where the molten steel temperature is higher than the liquidus temperature, usually in °C, reflecting the thermal state and fluidity of the molten steel.

[0063] Based on the determined superheat range, the parameters of the pulsed current will be adjusted accordingly to optimize the control effect of inclusions. Specifically, when the superheat is 15 - 20 °C, the pulsed current intensity applied is 190 - 210 A, preferably 200 A, to effectively remove large-sized inclusions; when the superheat is 20 - 25 °C, a current intensity of 160 - 180 A is adopted, preferably 170 A; when the superheat is 25 - 30 °C, the current intensity is adjusted to 130 - 150 A, preferably 140 A; when the superheat is in the range of 30 - 35 °C, a current of 100 - 120 A is applied, preferably 110 A; and when the superheat exceeds 35 °C, a lower current intensity of 70 - 90 A is used, preferably 80 A, to refine small-sized inclusions and improve their distribution. This pulsed current parameter adjustment mechanism based on superheat can dynamically optimize the current application strategy according to the thermal state and fluidity changes of the molten steel, thereby achieving precise control of different types of inclusions and significantly improving the cleanliness and mechanical properties of the billet.

[0064] In some examples, it further includes:

[0065] After obtaining the billet, detect the size and morphology of the inclusions in the billet, and classify the above inclusions into the first type of inclusions and the second type of inclusions, where the above first type of inclusions has a particle size greater than or equal to the first diameter, and the second type of inclusions has a particle size less than the first diameter;

[0066] Based on the detection results, determine the parameters of the pulsed current corresponding to different types of inclusions for application in subsequent casting cycles.

[0067] Exemplarily, after obtaining the billet, detect the size and morphology of the inclusions in the billet by electron microscopy. According to the detection results, classify the inclusions into the first type of inclusions and the second type of inclusions, where the particle size of the first type of inclusions is greater than or equal to the preset first diameter, and the particle size of the second type of inclusions is less than this diameter. This classification helps to take corresponding control measures for inclusions of different sizes to improve the cleanliness of the molten steel and the mechanical properties of the billet.

[0068] Based on the above detection results, the pulse current parameters corresponding to different types of inclusions are further determined to optimize the subsequent casting process. For example, when more inclusions of the first type are detected, a higher pulse current intensity and a lower pulse current frequency will be applied during the future casting process to promote the effective removal of these large-sized inclusions. On the contrary, when more inclusions of the second type are detected, a lower pulse current intensity and a higher pulse current frequency are applied to refine the small-sized inclusions and improve their distribution. Through this parameter adjustment mechanism based on the detection results, the pulse current technology can dynamically adapt to the specific conditions of different steel grades and different billets, achieve precise control of inclusions, and thus significantly improve the overall quality and mechanical properties of the billets.

[0069] It should be noted that in the embodiments of the present application, the first diameter can be set to 5μm, the higher current intensity range is 100A to 200A, the lower frequency is 1000Hz to 5000Hz, the lower current intensity range is 50A to 100A, and the higher frequency is 5000Hz to 20000Hz.

[0070] In some examples, it further includes:

[0071] Before the start of casting, after confirming that the initial parameters are correct, start the power supply, run for a preset time, and judge whether the average pulse current value is normal;

[0072] During the casting process, when the casting drawing speed reaches the preset target drawing speed, based on the characteristics of the above steel grade and the real-time casting situation, dynamically adjust the parameters of the above pulse current;

[0073] After the casting is completed, stop the output of the above pulse current and disconnect the power connection.

[0074] Exemplarily, the control process of the pulse current is a delicate and dynamic process, involving precise operations on the start, adjustment, and stop of the pulse current at different stages. Before the start of casting, it is first necessary to confirm the correctness of the initial parameters. This includes ensuring that parameters such as the current waveform, pulse frequency, and intensity match the characteristics of the steel grade and the actual production conditions. After confirmation, start the power supply and run for a preset time for system preheating to ensure the normal operation of the equipment. During this period, it is also necessary to judge whether the average pulse current value is normal to ensure the stable operation of the system in the initial stage. If the average current value deviates from the normal range, the system can adjust the current parameters or other control measures in a timely manner to restore to the predetermined normal state and avoid adverse effects on the molten steel treatment.

[0075] During the casting process, as the molten steel flows and solidifies, factors such as the temperature, fluidity of the molten steel, and the distribution of inclusions will change. Therefore, the parameters of the pulsed current also need to be dynamically adjusted according to the actual situation. When the casting speed reaches the preset target casting speed, the system will dynamically adjust the parameters of the pulsed current based on the characteristics of the steel grade and the real-time monitoring data. Specifically, information such as the composition and temperature of the molten steel will affect the distribution and movement of inclusions. Therefore, it is necessary to flexibly adjust the frequency, intensity, and waveform of the pulsed current according to these data to achieve efficient removal and refinement of inclusions. This dynamic adjustment ensures the real-time optimization effect of the pulsed current on the molten steel, thereby improving the quality of the final billet.

[0076] After the casting is completed, as the solidification of the molten steel is finished, the application of the pulsed current should also stop. At this time, the system will automatically stop the output of the pulsed current and disconnect the power connection to ensure that the current no longer affects the molten steel. This process not only avoids unnecessary energy consumption but also ensures that the billet is not overly disturbed during the cooling process, thus guaranteeing the final quality of the billet. Through this precise start, dynamic adjustment, and stop control, the application of the pulsed current can remain efficient and stable throughout the casting process, ensuring the control effect of inclusions and the mechanical properties of the final billet.

[0077] It should be noted that in the embodiments of this application, the preset time can be set to 3 min, and the preset target casting speed can be set to 1.4 m / min.

[0078] In some examples, it further includes:

[0079] During the casting process, an adjustable pulsed current waveform and a periodic pulsed current interruption time are set. Among them, the above-mentioned adjustable pulsed current waveform includes a square wave, a triangular wave, and a sine wave.

[0080] Exemplarily, the adjustable pulsed current waveform and the periodic pulsed current interruption time are key parameters for controlling inclusions in the molten steel and optimizing the quality of the billet. During the casting process, the waveform of the pulsed current is crucial for the effect on inclusions in the molten steel because currents of different waveforms will generate different electromagnetic forces on the inclusions, thereby affecting the removal, refinement, and uniform distribution of inclusions. The adjustable pulsed current waveform can include a square wave, a triangular wave, and a sine wave, and the selection and adjustment of these waveforms directly affect the application method of the current.

[0081] Square-wave pulsed current has a definite switching state. Its pulse intensity rapidly rises from zero to a set value, remains for a certain period of time, and then suddenly drops to zero. The square wave is suitable for situations where pulsed current needs to be applied quickly and strongly, and can generate a strong electromagnetic force on inclusions of relatively large sizes, prompting them to float or be removed rapidly. The pulsed current of the square wave can effectively handle larger and heavier inclusions, and due to its abrupt characteristics, can respond more quickly to changes in the molten steel.

[0082] Triangular-wave pulsed current has the characteristics of continuous increase and decrease, and can provide a smooth current change. This waveform generates a relatively uniform electromagnetic force during the gradual change of the current intensity, and is suitable for refining inclusions of relatively small sizes. The triangular wave can effectively control the uniform distribution of inclusions and avoid the aggregation or destruction of inclusions caused by sudden changes in the current.

[0083] Sine-wave pulsed current has a smooth continuous change, and its waveform changes in a periodic sine curve. The sine wave is suitable for applying a relatively stable electric field force to inclusions in the molten steel, can maintain a relatively uniform current intensity, and thus promotes the refinement and uniform distribution of small-sized inclusions. The sine wave can avoid overly disturbing the flow state of the molten steel during the treatment of the molten steel and has a good control effect at the same time.

[0084] In addition, the periodic interruption time of the pulsed current also plays an important role. The interruption time is the time interval when the pulsed current is not applied. The setting of this time period helps the molten steel to restore a certain equilibrium state during the intermittent period of applying the pulsed current, and prevents the adverse effects caused by the pulsed current acting for too long. By adjusting the interruption time, it is possible to avoid local overheating or excessive action on the molten steel caused by over-concentration of the current, and helps the inclusions to be evenly distributed under the action of the electric field force.

[0085] The technical solution of the present application will be further described in detail below through specific embodiments, such as Figure 2As shown in the figure, it is a schematic diagram of the electric field energization structure in the embodiment of the present application. This structure processes molten steel through pulse current technology to form a complete current loop, thereby achieving the removal and refinement of inclusions in the molten steel. The power supply provides pulsed current. The positive electrode interface is connected to an external wire column through a wire and further connected to an immersion nozzle. The immersion nozzle conducts the current into the molten steel and at the same time introduces the molten steel from the tundish into the mold. During the flow of the molten steel, due to the action of the electric field, inclusions are affected by electromagnetic force: large-sized inclusions float and are removed under the action of the electric field force, while small-sized inclusions are refined and evenly distributed. The negative electrode circuit is formed by the refractory rod in the tundish contacting the molten steel. The negative electrode clip is fixed at the tail of the refractory rod and connected to the negative electrode interface to ensure the stability of current transmission. The entire loop completes the closed conduction of current through the molten steel. By adjusting the pulsed current waveform and periodic interruption, the system can dynamically optimize the current parameters according to real-time monitoring data, thereby improving the accuracy of inclusion control and finally obtaining high-quality billets.

[0086] The pulsed current technology was used for the continuous casting of 7 furnaces of ultra-low carbon IF steel, and the inclusions in the molten steel were effectively controlled through the current loop. In the specific operation, the refractory rod serves as the negative conduction medium of the pulsed current and is vertically placed in the tundish and connected to the negative electrode of the pulsed current generator; the immersion nozzle serves as the positive electrode component and is connected to the positive terminal of the power supply through an external wire column to form a complete current loop. The power supply control panel sets the initial current to 50A for preheating tests. After ensuring the normal operation of the current system, when casting starts and the drawing speed reaches 1.4 m / min, the pulsed current is adjusted to 150A, the frequency is set to 10,000 Hz, and the duty cycle is 50%. During the stable casting process, the pulsed current continuously acts on the molten steel. After casting, samples of the cold-rolled steel coils of the 1st, 4th, and 7th furnaces were taken for testing, and their yield strength and tensile strength were analyzed. The results show that the yield strength of the cold-rolled steel coils after energization treatment reaches 237 MPa, and the tensile strength reaches 350 MPa, both significantly higher than those of the cold-rolled steel coils without energization treatment (yield strength 216 MPa, tensile strength 345 MPa). This result proves that the pulsed current effectively controls the inclusions in the molten steel, improves the cleanliness of the billets, further optimizes the grain structure, and enhances the comprehensive mechanical properties of the steel.

[0087] In summary, by applying pulsed current during the casting process, large-sized inclusions can be effectively removed, small-sized inclusions can be refined and their distribution can be optimized, thereby significantly improving the mechanical properties of ultra-low carbon IF steel, verifying the effectiveness and practical application value of pulsed current technology in the control of inclusions in molten steel.

[0088] Please refer to Figure 3 , which is a schematic diagram of the structure of a device for controlling inclusions in molten steel provided by the embodiment of the present application, including:

[0089] A steel grade acquisition unit 21 for acquiring the steel grade information of the molten steel to be cast;

[0090] A casting control unit 22 for casting the steel grade corresponding to the above-mentioned steel grade information and applying a pulsed current to the molten steel to obtain a billet.

[0091] Please refer to Figure 4 , an electronic device 300 is further provided in an embodiment of the present application, including a memory 310, a processor 320, and a computer program 311 stored on the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, the steps of any of the methods for controlling inclusions in molten steel described above are implemented.

[0092] Since the electronic device introduced in this embodiment is the device adopted by the device for controlling inclusions in molten steel in an embodiment of the present application, based on the method introduced in the embodiment of the present application, those skilled in the art can understand the specific implementation manners and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device implements the method in the embodiment of the present application will not be described in detail here. As long as the device adopted by those skilled in the art to implement the method in the embodiment of the present application belongs to the scope protected by the present application.

[0093] In the specific implementation process, when the computer program 311 is executed by the processor, any implementation manner in the corresponding embodiment of the first aspect can be implemented.

[0094] It should be noted that in the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0095] Those skilled in the art should understand that the embodiments of the present application may provide methods, systems, or computer program products. Therefore, the present application adopts the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application adopts the form of a computer program product implemented on one or more computer-readable storage media containing computer-readable program codes.

[0096] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowcharts and / or block diagrams can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowcharts and / or block diagrams can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the processFigure 1 one or more processes and / or blocks Figure 1 a device for the functions specified in one or more blocks

[0097] These computer program instructions can also be stored in a computer-readable memory capable of guiding a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, and the instruction device implements the processes Figure 1 one or more processes and / or blocks Figure 1 the functions specified in one or more blocks

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide for implementing the processes Figure 1 one or more processes and / or blocks Figure 1 the steps of the functions specified in one or more blocks

[0099] The embodiments of the present application also provide a computer program product, which includes computer software instructions. When the computer software instructions run on a processing device, the processing device is caused to execute Figure 1 the process of a method for controlling inclusions in molten steel in the corresponding embodiment

[0100] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are fully or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that a computer can store, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium, an optical medium, or a semiconductor medium, etc.

[0101] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein

[0102] In several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms.

[0103] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0104] In addition, each functional unit in various embodiments of this application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0105] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories, random access memories, magnetic disks, or optical discs that can store program codes.

[0106] The above embodiments are only used to illustrate the technical solutions of this application, rather than to limit it; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of various embodiments of this application.

[0107] Although the preferred embodiments of this specification have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once they learn of the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments as well as all changes and modifications that fall within the scope of this specification.

[0108] Obviously, those skilled in the art can make various changes and deformations to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and deformations of this specification fall within the scope of the claims of this specification and their equivalent technologies, this specification is also intended to include these modifications and deformations.

Claims

1. A method for controlling inclusions in molten steel, characterized in that: The method comprises: Get the steel type information of cast steel; The steel type corresponding to the steel type information is cast, and a pulse current is applied to the molten steel to obtain a cast billet.

2. The method for controlling inclusions in molten steel according to claim 1, characterized in that: The pulse current is generated based on a current loop formed by a power source, a positive electrode component, a negative electrode component and the molten steel.

3. The method for controlling inclusions in molten steel according to claim 2, characterized in that: The negative electrode assembly comprises: A negative electrode material, which is a conductive refractory material and is in contact with the molten steel; A negative electrode clamp is arranged at the tail of the negative electrode material and is not in contact with the molten steel.

4. The method for controlling inclusions in molten steel according to claim 2, characterized in that: The positive electrode assembly comprises: An immersed nozzle, which introduces the molten steel from the tundish into the crystallizer; An external wire post is embedded in the outer wall of the immersion water outlet.

5. The method for controlling inclusions in molten steel according to claim 1, characterized in that: Also includes: Determining the liquidus temperature based on the steel grade corresponding to the steel grade information; Determining a superheat range based on the liquidus temperature and the actual temperature of the molten steel; Based on the superheat range, the parameters of the pulse current are adjusted.

6. The method for controlling inclusions in molten steel according to claim 1, characterized in that: Also includes: After obtaining the ingot, detecting the size and shape of inclusions in the ingot, and classifying the inclusions into first-class inclusions and second-class inclusions, wherein the first-class inclusions have a particle size greater than or equal to a first diameter, and the second-class inclusions have a particle size less than the first diameter; Based on the detection results, the parameters of the pulse current corresponding to different types of inclusions are determined for application in subsequent casting cycles.

7. The method for controlling inclusions in molten steel according to claim 1, characterized in that: Also includes: Before casting begins, after confirming that the initial parameters are correct, start the power supply, run for the preset time and determine whether the average pulse current value is normal; During the casting process, when the casting speed reaches a preset target speed, the parameters of the pulse current are dynamically adjusted based on the characteristics of the steel grade and the real-time casting situation; After the casting is finished, the output of the pulse current is stopped and the power supply is disconnected.

8. A device for controlling inclusions in molten steel, characterized in that: include: A steel grade acquisition unit, used for acquiring steel grade information of cast steel; The casting control unit is used to cast the steel type corresponding to the steel type information and apply pulse current to the molten steel to obtain a cast billet.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of the method for controlling inclusions in molten steel as described in any one of claims 1 to 7 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for controlling molten steel inclusions according to any one of claims 1 to 7 is implemented.

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