Different-steel-grade group casting production control method of thin slab continuous casting machine and related products

Abstract

The invention discloses a different-steel-grade group casting production control method of a thin slab continuous casting machine and related products, and relates to the technical field of metallurgy, and the method comprises the steps that according to a first preset rule, production plan arrangement of different-steel-grade group casting is conducted, and a target production plan is obtained; on the basis of the target production plan, the online cone adjusting opportunity of different steel grade group casting is obtained; setting a second preset rule according to the components in the molten steel and the degree of superheat of the molten steel during group casting of different steel grades; setting a third preset rule according to different steel type characteristics during group casting of different steel types; and on the basis of the online cone adjusting time and the rules, the production process of group casting of the different steel grades is controlled. According to the method, the stability of group casting production of different steel grades is improved, the risk during group casting of the different steel grades is reduced, and the overall number of continuous casting furnaces is increased. And secondly, after stable group casting of different steel types is achieved, a short production plan is canceled, the overall continuous casting furnace number is increased, and the refractory material cost and the production efficiency are greatly improved.

Description

Technical Field

[0001] The present application relates to the field of metallurgical technologies, and in particular, to a method for controlling the production of combined casting of different steel grades in a thin slab continuous caster and related products. Background Art

[0002] With the vigorous development of China's iron and steel metallurgical technologies, the number of iron and steel enterprises has been gradually increasing, which means that the competition among iron and steel enterprises is becoming increasingly fierce, and the options for customers are also increasing. Therefore, current orders are gradually developing towards small batches and diversification. However, such orders impose a heavier cost burden on continuously producing steel enterprises.

[0003] To integrate small-batch orders, different steel grades are combined for casting. After combined casting, the same casting contains multiple steel grades. Since there are certain differences in the compositions of different steel grades, there are also certain differences in solidification shrinkage characteristics, and thus the set values of the mold taper are also different. After combined casting of different steel grades, the mold taper value can only be set according to the value of the steel grade with the largest taper in the same casting. This results in other steel grades being produced under conditions where the taper is greater than their own set values, and the taper parameters do not match the steel grades, which will not only severely wear the copper plate but also affect production stability. At the same time, due to the high casting speed of the thin slab continuous caster and the differences in the compositions of steel grades during combined casting of different steel grades, problems such as unstable heat transfer and temperature fluctuations of thermocouples are likely to occur during the mixing process of molten steel, which impacts production stability.

[0004] In the prior art, after combined casting of different steel grades, the mold taper value can only be set according to the value of the steel grade with the largest taper in the same casting. This results in other steel grades being produced under conditions where the taper is greater than their own set values, and the taper parameters do not match the steel grades, which will not only severely wear the copper plate but also affect production stability. At the same time, due to the high casting speed of the thin slab continuous caster and the differences in the compositions of steel grades during combined casting of different steel grades, problems such as unstable heat transfer and temperature fluctuations of thermocouples are likely to occur during the mixing process of molten steel, which impacts production stability.

[0005] Therefore, it is necessary to propose a method for controlling the production of combined casting of different steel grades in a thin slab continuous caster to solve the problem of how to improve production stability. Summary of the Invention

[0006] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further elaborated in detail in the Detailed Description section. The Summary of the Invention section of the present 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.

[0007] In a first aspect, the present application proposes a method for controlling the production of combined casting of different steel grades in a thin slab continuous caster, including:

[0008] Arrange the production plan for the continuous casting of different steel grades according to the first preset rule to obtain the target production plan; the first preset rule is a rule for arranging steel grades with preset similar chemical compositions and steel grade characteristics together for continuous casting.

[0009] Based on the target production plan, obtain the online taper adjustment timing for the continuous casting of different steel grades.

[0010] According to the composition and superheat of the molten steel during the continuous casting of different steel grades, set the second preset rule; the second preset rule is a rule for controlling the sulfur content, phosphorus content, hydrogen content, and superheat of the molten steel during the mixed casting of different steel grades according to the target production requirements.

[0011] According to the different steel grade characteristics during the continuous casting of different steel grades, set the third preset rule; the third preset rule is a rule for controlling the drawing speed during the mixing process of the molten steel during the mixed casting of different steel grades according to the target production requirements.

[0012] Control the production process of the continuous casting of different steel grades through the online taper adjustment timing, the second preset rule, and the third preset rule for the continuous casting of different steel grades.

[0013] In a feasible implementation manner, after arranging the production plan for the continuous casting of different steel grades according to the first preset rule to obtain the target production plan, it further includes:

[0014] Based on the target production plan, determine the setting value of the mold taper for each steel grade.

[0015] Through the online taper adjustment function of the thin slab caster, adjust the mold taper of each steel grade based on different setting values of the mold taper, where the number of online taper adjustments per casting is less than or equal to 3 times.

[0016] In a feasible implementation manner, before adjusting the mold taper of each steel grade based on different setting values of the mold taper through the online taper adjustment function of the thin slab caster, it further includes:

[0017] Clean and inspect the copper plate contact surface of the mold for each steel grade.

[0018] Adjust the corner gap between the wide face copper plate and the narrow face copper plate of the mold for each steel grade.

[0019] In a feasible implementation manner, the obtaining of the online taper adjustment timing for the continuous casting of different steel grades based on the target production plan includes:

[0020] Based on the target production plan, before the mixed casting of molten steel of different steel grades, obtain the online taper adjustment timing for the mixed casting of different steel grades.

[0021] In a feasible implementation manner, the production plan for the mixed casting of different steel grades is arranged according to the first preset rule to obtain a target production plan; the first preset rule is a rule for arranging steel grades with preset similar chemical components and steel grade characteristics together for continuous casting, where:

[0022] The chemical components with the preset similarity have a carbon equivalent deviation of different steel grades less than or equal to 0.02.

[0023] In a feasible implementation manner, the second preset rule is set according to the components and superheat of the molten steel during the mixed casting of different steel grades; the second preset rule is a rule for controlling the sulfur element content, phosphorus element content, hydrogen content, and superheat of the molten steel during the mixed casting of different steel grades according to the target production requirements. Among them, controlling the sulfur element content, phosphorus element content, hydrogen content, and superheat of the molten steel includes:

[0024] Controlling the sulfur element content in the molten steel to be less than or equal to 0.003%;

[0025] Controlling the phosphorus element content in the molten steel to be less than or equal to 0.02%;

[0026] Controlling the hydrogen content in the molten steel to be less than or equal to 5 ppm;

[0027] Controlling the deviation of the superheat of the molten steel from the previous furnace within the range of ±5°C.

[0028] In a feasible implementation manner, the third preset rule is set according to the different steel grade characteristics during the mixed casting of different steel grades; the third preset rule is a rule for controlling the drawing speed during the mixing process of the molten steel during the mixed casting of different steel grades according to the target production requirements. Among them, controlling the drawing speed during the mixing process of the molten steel includes:

[0029] Controlling the drawing speed during the mixing process of molten steel of different steel grades to be less than 4.6 m / min.

[0030] In a second aspect, the present application proposes a production control system for the mixed casting of different steel grades of a thin slab continuous caster, which is applied to the production control method for the mixed casting of different steel grades of the thin slab continuous caster described in any one of the above embodiments, including:

[0031] A production plan arrangement module for arranging the production plan for the mixed casting of different steel grades according to the first preset rule to obtain a target production plan; the first preset rule is a rule for arranging steel grades with preset similar chemical components and steel grade characteristics together for continuous casting;

[0032] The taper adjustment timing selection module is used to obtain the online taper adjustment timing for the mixed casting of different steel grades based on the target production plan.

[0033] The molten steel composition and superheat control module for the mixed casting of different steel grades is used to set a second preset rule according to the composition and superheat of the molten steel during the mixed casting of different steel grades; the second preset rule is a rule for controlling the sulfur element content, phosphorus element content, hydrogen content, and molten steel superheat in the molten steel during the mixed casting of different steel grades according to the target production requirements.

[0034] The casting speed control module for the mixed casting of different steel grades is used to set a third preset rule according to the characteristics of different steel grades during the mixed casting of different steel grades; the third preset rule is a rule for controlling the casting speed during the mixing process of the molten steel according to the target production requirements.

[0035] The production control module for the mixed casting of different steel grades is used to control the production process of the mixed casting of different steel grades through the online taper adjustment timing, the second preset rule, and the third preset rule for the mixed casting of different steel grades.

[0036] 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. When the processor executes the computer program stored in the memory, it implements the steps of the method for controlling the production of the mixed casting of different steel grades of the thin slab continuous caster in the first aspect as described above.

[0037] In a fourth aspect, the present application also proposes a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the method for controlling the production of the mixed casting of different steel grades of the thin slab continuous caster in the first aspect.

[0038] In summary, the method for controlling the production of the mixed casting of different steel grades of the thin slab continuous caster proposed in the present application first improves the production stability of the mixed casting of different steel grades, that is, by providing the online taper adjustment timing during the mixed casting of different steel grades, the control principles for the content of each element in the molten steel, superheat control, and casting speed control, the risk during the mixed casting of different steel grades is reduced. The overall number of consecutive casting heats is increased. Secondly, after the stable mixed casting of different steel grades is achieved, the shorter production plan is cancelled, the overall number of consecutive casting heats is increased, and the refractory cost and production efficiency are also greatly improved.

[0039] For the method for controlling the production of the mixed casting of different steel grades of the thin slab continuous caster proposed in the present application, other advantages, objectives, and features of the present application will be partially reflected by the following description, and will also be partially understood by those skilled in the art through the research and practice of the present application. Description of the Drawings

[0040] By reading the detailed description of the preferred embodiments below, 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 limit this specification. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0041] Figure 1 It is a flowchart of a production control method for combined casting of different steel grades of a thin slab continuous caster provided by an embodiment of the present application;

[0042] Figure 2 It is a schematic structural diagram of a production control system for combined casting of different steel grades of a thin slab continuous caster provided by an embodiment of the present application;

[0043] Figure 3 It is a schematic structural diagram of an electronic device for production control of combined casting of different steel grades of a thin slab continuous caster provided by an embodiment of the present application. Specific embodiments

[0044] To better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below through the drawings and specific embodiments. It should be understood that the specific features in the embodiments of this specification and the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. Without conflict, the technical features in the embodiments of this specification and the embodiments can be combined with each other.

[0045] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element. The term "more than two" includes two or more than two.

[0046] Please refer to Figure 1 , which is a flowchart of a production control method for combined casting of different steel grades of a thin slab continuous caster provided by an embodiment of the present application, and includes:

[0047] S110. Arrange the production plan for continuous casting of different steel grades according to the first preset rule to obtain the target production plan; the first preset rule is a rule for arranging steel grades with preset similarity in chemical composition and steel grade characteristics together for continuous casting.

[0048] Exemplarily, when arranging the production plan for continuous casting of different steel grades, follow the principle of "the same steel family and close composition". By setting the first preset rule to arrange steel grades with similar chemical compositions and steel grade characteristics together for continuous casting, the instability during the production process caused by excessive differences in steel grades can be reduced. For example, steel grades of the same steel family may be relatively close in solidification characteristics, thermal expansion coefficient, etc., which is beneficial to maintaining the relative stability of process parameters during continuous casting.

[0049] S120. Based on the target production plan, obtain the online taper adjustment timing for the continuous casting of different steel grades.

[0050] Exemplarily, it is very important to select the appropriate online taper adjustment timing. The online taper adjustment should be carried out at an appropriate time before the steel grade change to ensure that the mold taper can smoothly transition to the requirements of the new steel grade. At the same time, the production rhythm and equipment operation status should be considered to avoid unnecessary interference and failures during the production process.

[0051] S130. Set the second preset rule according to the composition and superheat of the molten steel during the continuous casting of different steel grades; the second preset rule is a rule for controlling the sulfur content, phosphorus content, hydrogen content and superheat of the molten steel when different steel grades are continuously cast according to the target production requirements.

[0052] Exemplarily, by setting the second preset rule to control the content of impurity elements in the molten steel, such as sulfur content and phosphorus content. The content of impurity elements may affect the quality and performance of steel and increase the risk of slab defects. By optimizing the steelmaking process and strengthening the refining of molten steel, the content of impurity elements can be reduced and the purity of molten steel can be improved.

[0053] Furthermore, hydrogen in steel may cause defects such as hydrogen-induced cracks. Therefore, strict control of the hydrogen content in the molten steel is required. By adopting appropriate steelmaking processes and dehydrogenation treatment methods, the hydrogen content in the molten steel can be reduced and the quality of steel can be improved.

[0054] Furthermore, the superheat of molten steel refers to the difference between the molten steel temperature and the liquidus temperature of steel. Reasonable control of superheat is crucial for the quality of slabs. Excessive superheat may lead to coarse internal structure of slabs and increase the possibility of crack generation; while too low superheat may result in poor fluidity of molten steel and affect the smooth progress of the casting process.

[0055] S140. Set a third preset rule according to the characteristics of different steel grades during the combined casting of different steel grades; the third preset rule is a rule for controlling the drawing speed during the mixing process of molten steel according to the target production requirements when different steel grades are cast together.

[0056] Exemplarily, during the casting process, when the molten steel of different steel grades is mixed, it is necessary to strictly control the drawing speed. The change of the drawing speed will affect the solidification speed and quality of the continuous casting billet. During the steel grade switching and combined casting process, by setting the third preset rule, the drawing speed is adjusted in a timely manner according to the characteristics of the steel grade and production requirements to ensure the stable quality of the continuous casting billet. At the same time, closely monitor the impact of the change of the drawing speed on the surface quality and internal structure of the continuous casting billet, and take corresponding adjustment measures in a timely manner.

[0057] S150. Control the production process of the combined casting of different steel grades through the online taper adjustment timing, the second preset rule, and the third preset rule of the combined casting of different steel grades.

[0058] In summary, a method for controlling the production of combined casting of different steel grades in a thin slab continuous caster provided by the present application reduces the risk during the combined casting of different steel grades by providing the online taper adjustment timing during the combined casting of different steel grades, as well as controlling the content of different elements in the molten steel, superheat control, and drawing speed control, and realizes a stable production process for the combined casting of different steel grades.

[0059] In some examples, after arranging the production plan for the combined casting of different steel grades according to the first preset rule to obtain the target production plan, it further includes:

[0060] Based on the target production plan, determine the set value of the mold taper for each steel grade;

[0061] Through the online taper adjustment function of the thin slab continuous caster, adjust the mold taper of each steel grade based on different set values of the mold taper, where the number of online taper adjustments per casting is less than or equal to 3 times.

[0062] Exemplarily, the shrinkage characteristics of different steel grades may be different during the solidification process, so it is necessary to determine a suitable taper for each steel grade. The size of the taper will affect the gap between the continuous casting billet and the mold wall, and further affect the quality of the continuous casting billet and the stability of production. By analyzing and experimenting on the solidification characteristics of different steel grades, determine the set value of the mold taper that is most suitable for each steel grade.

[0063] Furthermore, the online taper adjustment function of the thin slab continuous caster can adjust the mold taper in real time according to the requirements of different steel grades during the production process. In this way, it can adapt to the changes of different steel grades without interrupting production, improving the flexibility and stability of production. When switching from one steel grade to another, the online taper adjustment function can quickly adjust the mold taper to meet the requirements of the new steel grade.

[0064] Meanwhile, frequent online taper adjustment may have an adverse impact on the stability of the production process. Each taper adjustment may cause changes in the molten steel flow state, heat transfer situation, etc. inside the mold. If the number of taper adjustments is too large, these changes will be more complex and difficult to control, increasing the risk of production accidents and billet quality problems. Moreover, the frequent use of the online taper adjustment function of the mold may cause certain wear and damage to the equipment itself, reducing the service life of the equipment. Limiting the number of taper adjustments can reduce the wear of the equipment and ensure the long-term stable operation of the equipment. In addition, excessive online taper adjustment will occupy production time and reduce production efficiency. Therefore, controlling the number of taper adjustments within 3 times can ensure the continuity and high efficiency of the production process.

[0065] In some examples, before adjusting the mold taper of each steel grade based on different mold taper setting values through the online taper adjustment function of the thin slab caster, it further includes:

[0066] Clean and inspect the copper plate contact surface of the mold in each steel grade;

[0067] Adjust the corner gap between the wide-face copper plate and the narrow-face copper plate of the mold in each steel grade.

[0068] Exemplarily, after determining the target production plan, if online taper adjustment is required, special attention needs to be paid to the cleanliness control of the copper plate contact surface of the mold and the control of the corner gap between the wide-face copper plate and the narrow-face copper plate of the mold during the production preparation process.

[0069] Specifically, the cleanliness of the copper plate contact surface of the mold is crucial for billet quality and production stability. If there are impurities, oil stains and other pollutants on the contact surface, it will affect the heat transfer effect, resulting in a decline in the surface quality of the billet and even serious accidents such as breakout may occur. Therefore, during the production preparation process, the mold copper plate should be thoroughly cleaned and inspected to ensure that the contact surface is clean and smooth. Mechanical cleaning, chemical cleaning and other methods can be used to remove the dirt and oxides on the copper plate surface.

[0070] Furthermore, the corner gap between the wide-face copper plate and the narrow-face copper plate of the mold will also affect billet quality and production stability. If the corner gap is too large, it will cause molten steel leakage and increase the risk of breakout; if the corner gap is too small, it may affect the thermal expansion of the copper plate and cause the copper plate to deform. Therefore, during the production preparation process, the corner gap of the mold should be strictly controlled and adjusted. By adjusting the installation accuracy of the copper plate, using appropriate sealing materials and other methods, the corner gap can be ensured to be within a reasonable range.

[0071] In some examples, obtaining the online taper adjustment timing for the casting of different steel grade groups based on the target production plan includes:

[0072] Based on the target production plan, before the mixed casting of molten steel of different steel grades, obtain the online taper adjustment timing for the mixed casting of different steel grades.

[0073] Exemplarily, the selection of the online taper adjustment timing is very crucial, which directly affects the production stability and the quality of the continuous casting billet. To ensure the stability of continuous casting production and the quality of the billet, the online taper adjustment timing is generally selected before the mixed casting of molten steel of different steel grades to reduce the occurrence of abnormal situations and ensure the stability of taper adjustment.

[0074] The reasons for choosing to perform online taper adjustment before the mixed casting of molten steel of different steel grades are mainly as follows:

[0075] Adapt to the new steel grade in advance: Molten steel of different steel grades has different physical and chemical properties, and the taper requirements for the mold may also be different. Performing taper adjustment before mixed casting can enable the mold to adapt to the upcoming new steel grade in advance and reduce the quality problems of the continuous casting billet caused by the change of steel grade.

[0076] Stabilize the production process: Performing taper adjustment before mixed casting can avoid the unstable factors brought by performing taper adjustment during the molten steel mixing process. During the molten steel mixing process, there are differences in composition and the production state is relatively complex. If taper adjustment is performed at this time, it may further increase the instability of the production process.

[0077] Furthermore, abnormal situations are likely to occur under the high casting speed state during the molten steel mixing process. That is, during the molten steel mixing process, due to the differences in the compositions of different steel grades, the solidification characteristics and fluidity of the molten steel will also change. Under the high casting speed state, the residence time of the molten steel in the mold is shortened and the solidification speed is accelerated, and quality problems such as surface cracks and internal porosity are likely to occur. In addition, the high casting speed may also cause the flow of the molten steel in the mold to be unstable, increasing the risk of production accidents such as breakout.

[0078] Moreover, the high casting speed state during the molten steel mixing process will have an adverse impact on taper adjustment. On the one hand, the high casting speed will make the flow of the molten steel in the mold more intense, increasing the difficulty and uncertainty of taper adjustment. On the other hand, under the high casting speed state, the vibration and thermal load of the mold will also increase, which may affect the stability and accuracy of the taper adjustment mechanism, thereby reducing the effect of taper adjustment.

[0079] To ensure the stability of continuous casting production and the quality of the billet, the online taper adjustment timing is selected before the mixed casting of molten steel of different steel grades, and at the same time, the high casting speed state should be avoided during the molten steel mixing process to reduce the occurrence of abnormal situations and ensure the stability of taper adjustment.

[0080] In some examples, a production plan arrangement for continuous casting of different steel grades according to a first preset rule is performed to obtain a target production plan; the first preset rule is a rule for arranging steel grades with preset similar chemical compositions and steel grade characteristics together for continuous casting, where:

[0081] The chemical compositions with the preset similarity refer to that the carbon equivalent deviation of different steel grades is less than or equal to 0.02.

[0082] Exemplarily, the carbon equivalent is to convert the contents of alloying elements in steel that have effects on hardening, cold cracking, embrittlement, etc., including carbon, into the equivalent content of carbon. By calculating the carbon equivalent, the welding performance, hardness, strength and other characteristics of steel can be evaluated to a certain extent. When the carbon equivalent deviation of different steel grades is within 0.02, it can be considered that these steel grades are relatively close in chemical composition. This means that they may have similarities in solidification characteristics, thermal expansion coefficient, strength, etc. In the production of continuous casting of different steel grades in a thin slab caster, arranging steel grades with a small carbon equivalent deviation can reduce the instability in the production process caused by excessive differences in steel grades, such as surface defects of the slab, internal cracks, and difficulty in drawing the slab. This helps to improve the production stability and the quality of the slab.

[0083] The steel grade characteristics with the preset similarity refer to major categories of steel grades such as low-carbon steel (C content ≤ 0.07%), low-carbon alloy steel (C content ≤ 0.07%, containing alloying elements such as Mn and Si at the same time), medium-carbon steel (C content 0.175% - 0.20%), medium-carbon alloy steel (C content 0.175% - 0.20%, containing alloying elements such as Mn and Si at the same time), etc.

[0084] Arranging steel grades with similar chemical compositions and steel grade characteristics together for continuous casting can reduce the difficulties in adjusting process parameters and production instability factors caused by excessive differences in steel grades. For example, steel grades belonging to the same steel grade series or having similar chemical compositions may be relatively similar in solidification characteristics, thermal expansion coefficient, etc., which is beneficial to maintaining relatively stable production conditions during the continuous casting process.

[0085] In some examples, a second preset rule is set according to the composition and superheat of the molten steel during the continuous casting of different steel grades; the second preset rule is a rule for controlling the sulfur element content, phosphorus element content, hydrogen content and superheat of the molten steel during the mixed casting of different steel grades according to the target production requirements, where controlling the sulfur element content, phosphorus element content, hydrogen content and superheat of the molten steel includes:

[0086] Controlling the sulfur element content in the molten steel to be less than or equal to 0.003%;

[0087] Controlling the phosphorus element content in the molten steel to be less than or equal to 0.02%;

[0088] Control the hydrogen content in the molten steel to be less than or equal to 5 ppm;

[0089] Control the deviation of the superheat of the molten steel from the previous heat within the range of ±5°C.

[0090] Exemplarily, during continuous casting production, when switching between different steel grades, mixed-cast heats may occur. The quality control of the molten steel in mixed-cast heats is very crucial because if the quality of the molten steel in mixed-cast heats is unstable, it may lead to quality problems in the billets, affecting subsequent processing and service performance.

[0091] Control the sulfur (S) element content to be below 0.003%: Sulfur in steel will form sulfide inclusions, reducing the toughness, ductility, and weldability of the steel. Controlling the sulfur content at a low level can reduce the formation of sulfides and improve the quality of the steel. A lower sulfur content helps to ensure the purity of the steel and reduce the occurrence of cracks and other defects caused by sulfides.

[0092] Control the phosphorus (P) element content to be below 0.02%: Phosphorus will increase the strength and hardness of the steel, but at the same time, it will reduce the plasticity and toughness of the steel, especially at low temperatures, which is likely to cause an increase in the brittleness of the steel. Controlling the phosphorus content can avoid the embrittlement of the steel and improve the processing performance and service reliability of the steel.

[0093] Control the hydrogen (H) content to be below 5 ppm: Hydrogen in steel will cause hydrogen embrittlement, that is, when the hydrogen content in the steel is relatively high, sudden brittle fractures may occur during processing or use. Strictly controlling the hydrogen content can reduce the risk of hydrogen embrittlement and ensure the safety and reliability of the steel.

[0094] Control the deviation of the superheat from the previous heat within the range of ±5°C: The superheat of the molten steel refers to the difference between the temperature of the molten steel and the liquidus temperature of the steel. The magnitude of the superheat directly affects the solidification process of the molten steel in the mold and the quality of the billet. Controlling the deviation of the superheat from the previous heat within a small range can ensure the stability of the solidification process and reduce the quality fluctuations of the billet caused by excessive changes in superheat, such as surface cracks, internal porosity, and other problems.

[0095] In some examples, set the third preset rule according to the different steel grade characteristics during casting of different steel grades; the third preset rule is a rule for controlling the drawing speed during the mixing process of molten steel when mixing different steel grades according to the target production requirements, where controlling the drawing speed during the mixing process of molten steel includes:

[0096] Control the drawing speed during the mixing process of molten steel of different steel grades to be less than 4.6 m / min.

[0097] Exemplarily, during the mixing process of molten steel of different steel grades, the control of the drawing speed is crucial. The drawing speed is the speed at which the continuous casting billet is drawn out of the mold during the continuous casting process.

[0098] When the molten steel of different steel grades is mixed, its solidification characteristics and thermophysical properties may change. If the drawing speed is too fast, it may lead to insufficient solidification time of the billet in the mold, resulting in quality problems such as surface cracks and internal porosity. By controlling the drawing speed within <4.6 m / min, sufficient time can be given for the molten steel to solidify in the mold, forming a good surface and internal quality of the billet.

[0099] When different steel grades are mixed, the flow state and temperature distribution of the molten steel will also change. An appropriate drawing speed can help maintain a stable production process and reduce the risk of production accidents such as breakout caused by unstable molten steel flow.

[0100] The control of the drawing speed also needs to consider the performance and bearing capacity of the continuous casting equipment. An excessively high drawing speed may cause excessive load on equipment such as the mold and secondary cooling system, affecting the service life and reliability of the equipment. Controlling the drawing speed within a certain range can ensure the normal operation of the equipment, improve production efficiency and equipment utilization rate.

[0101] By comprehensively considering factors such as the solidification characteristics, equipment performance, and production quality requirements during the mixing of different steel grades, the drawing speed is controlled within <4.6 m / min. In actual production, operators can adjust within this range according to specific circumstances to achieve the best production effect.

[0102] In summary, a production control method for combined casting of different steel grades in a thin slab continuous caster proposed in this application first improves the stability of combined casting of different steel grades, that is, by providing the opportunity for online taper adjustment during combined casting of different steel grades, the control principles of the content of each element in the molten steel, superheat control, and drawing speed control, the risk during combined casting of different steel grades is reduced. The overall number of continuous casting heats is increased. Secondly, after the stable combined casting of different steel grades is achieved, the short production plan is cancelled, the overall number of continuous casting heats is increased, and the refractory cost and production efficiency are also greatly improved.

[0103] It should be noted that the above embodiments are only the best examples and are not intended to limit the implementation manners of this application.

[0104] Based on the same application concept, an alternate-grade group casting production control system for a thin slab continuous caster is also provided in the embodiments of the present application. Since the principle of solving problems by the alternate-grade group casting production control system for the thin slab continuous caster in the embodiments of the present application is similar to that of the alternate-grade group casting production control method for the thin slab continuous caster in the above embodiments of the present application, the implementation of the alternate-grade group casting production control system for the thin slab continuous caster can refer to the implementation of the alternate-grade group casting production control method for the thin slab continuous caster, and the repeated parts will not be elaborated.

[0105] As Figure 2 shown, Figure 2 is a schematic structural diagram of an alternate-grade group casting production control system for a thin slab continuous caster provided by the present application, including:

[0106] A production plan scheduling module 21, configured to schedule a production plan for alternate-grade group casting according to a first preset rule to obtain a target production plan; the first preset rule is a rule for arranging steel grades with preset similar chemical compositions and steel grade characteristics together for continuous casting;

[0107] A taper adjustment timing selection module 22, configured to obtain the online taper adjustment timing of the alternate-grade group casting based on the target production plan;

[0108] An alternate-grade mixed-casting molten steel composition and superheat control module 23, configured to set a second preset rule according to the composition and superheat of the molten steel during the alternate-grade group casting; the second preset rule is a rule for controlling the sulfur element content, phosphorus element content, hydrogen content, and molten steel superheat in the molten steel during the mixed casting of different steel grades according to the target production requirements;

[0109] An alternate-grade mixed-casting casting speed control module 24, configured to set a third preset rule according to the different steel grade characteristics during the alternate-grade group casting; the third preset rule is a rule for controlling the casting speed during the mixing process of the molten steel according to the target production requirements during the mixed casting of different steel grades;

[0110] An alternate-grade group casting production control module 25, configured to control the production process of the alternate-grade group casting through the online taper adjustment timing, the second preset rule, and the third preset rule of the alternate-grade group casting.

[0111] In summary, the production control system for the combined casting of different steel grades in the thin slab continuous caster provided by this application first improves the production stability of the combined casting of different steel grades. That is, by providing the online taper adjustment timing during the combined casting of different steel grades, the control principles for the content of each element in the molten steel, the superheat control, and the casting speed control, the risks during the combined casting of different steel grades are reduced, and the overall number of consecutive casting heats is increased. Secondly, after the stable combined casting of different steel grades is achieved, the short production plans are cancelled, the overall number of consecutive casting heats is increased, and the refractory cost and production efficiency are also greatly improved.

[0112] As Figure 3 shown, based on the same inventive concept, an embodiment of this application also provides an electronic device 300, 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 the above-mentioned production control method for the combined casting of different steel grades in the thin slab continuous caster are implemented.

[0113] Since the electronic device introduced in this embodiment is the device used to implement a production control method for the combined casting of different steel grades in a thin slab continuous caster in an embodiment of this application, based on the method introduced in the embodiment of this 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 this application will not be described in detail here. As long as the device used by those skilled in the art to implement the method in the embodiment of this application belongs to the scope of protection of this application.

[0114] Those skilled in the art should understand that the embodiments of this application can be provided as a method, a system, or a computer program product. Therefore, this application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] This 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 this application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as the combination of flows and / or blocks in the flowcharts and / or block diagrams, can 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 process Figure 1 each process or multiple processes and / or blocks Figure 1means for the functions specified in one or more boxes.

[0116] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction means that implements the functions specified in one Figure 1 process or more processes and / or boxes Figure 1 means for the functions specified in one or more boxes.

[0117] These computer program instructions may also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 process or more processes and / or boxes Figure 1 means for the functions specified in one or more boxes.

[0118] An embodiment of the present application also provides 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 the process of the method for controlling the production of casting different steel grades in a thin slab continuous caster in the corresponding embodiment.

[0119] A 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 wholly or partially generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from a website, a computer, a server, or a data center to another website, a computer, a server, or a data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

[0120] 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 modules described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0121] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules is only a logical function division, and there can be other division methods in actual implementation. For example, multiple modules 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 to each other can be indirect couplings or communication connections through some interfaces, devices, or units, and can be in electrical, mechanical, or other forms.

[0122] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they can be located in one place or distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0123] In addition, the functional modules in the various embodiments of the present application can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0124] If the integrated module is implemented in the form of a software functional module 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 the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing 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 the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0125] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present 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 cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling the production of different steel grades of a thin slab continuous casting machine, characterized in that: include: Arrange the production plan for group casting of different steel grades according to the first preset rule to obtain a target production plan; The first preset rule is a rule for arranging steel grades having preset similarity in chemical composition and steel grade characteristics together for continuous casting; Based on the target production plan, obtaining the timing of online cone adjustment for the group casting of different steel grades; A second preset rule is set according to the composition of the molten steel and the superheat of the molten steel when the different steel grades are mixed and poured; the second preset rule is a rule for controlling the sulfur content, phosphorus content, hydrogen content and superheat of the molten steel when different steel grades are mixed and poured according to target production requirements; According to the different steel grade characteristics when the different steel grades are mixed and cast, a third preset rule is set; the third preset rule is a rule for controlling the casting speed of the molten steel mixing process when different steel grades are mixed and cast according to the target production requirements; The production process of the group casting of different steel grades is controlled by the online cone adjustment timing, the second preset rule and the third preset rule of the group casting of different steel grades.

2. The method for controlling the production of different steel grades of a thin slab continuous casting machine according to claim 1, characterized in that: After the production plan arrangement of the different steel grade group casting is performed according to the first preset rule and the target production plan is obtained, the method further includes: Based on the target production plan, determining a set value of the mold back taper for each steel grade; Through the online cone adjustment function of the thin slab continuous casting machine, the mold back taper of each steel grade is adjusted based on different mold back taper setting values, wherein the number of online cone adjustments is less than or equal to 3 times for the same casting time.

3. The method for controlling the production of different steel grades of a thin slab continuous casting machine according to claim 2, characterized in that: Before adjusting the mold back taper of each steel grade based on different mold back taper setting values ​​by using the online taper adjustment function of the thin slab continuous casting machine, the method further includes: Clean and inspect the copper plate contact surface of the crystallizer for each steel grade; The corner gap between the wide copper plate and the narrow copper plate of the crystallizer in each steel grade is adjusted.

4. The method for controlling the production of different steel grades of a thin slab continuous casting machine according to claim 1, characterized in that: The obtaining, based on the target production plan, the timing of online cone adjustment for group casting of different steel grades comprises: Based on the target production plan, before the mixed pouring of molten steel of different steel grades, the online cone adjustment timing of the group pouring of different steel grades is obtained.

5. The method for controlling the production of different steel grades of a thin slab continuous casting machine according to claim 1, characterized in that: The production plan for group casting of different steel grades is arranged according to the first preset rule to obtain a target production plan; the first preset rule is a rule for arranging steel grades with preset similarity in chemical composition and steel grade characteristics together for continuous casting, wherein: The chemical composition of the preset similarity is that the carbon equivalent deviation of different steel grades is less than or equal to 0.

02.

6. The method for controlling the production of different steel grades of a thin slab continuous casting machine according to claim 1, characterized in that: The second preset rule is set according to the composition of the molten steel and the superheat of the molten steel when the different steel grades are mixed and poured; the second preset rule is a rule for controlling the sulfur content, phosphorus content, hydrogen content and superheat of the molten steel when different steel grades are mixed and poured according to the target production requirements, wherein the sulfur content, phosphorus content, hydrogen content and superheat of the molten steel are controlled, including: Controlling the sulfur content in the molten steel to be less than or equal to 0.003%; The phosphorus content in the molten steel is controlled to be less than or equal to 0.02%; Controlling the hydrogen content in the molten steel to be less than or equal to 5 ppm; The deviation of the superheat degree of the molten steel from the previous heat is controlled within the range of ±5°C.

7. The method for controlling the production of different steel grades of a thin slab continuous casting machine according to claim 1, characterized in that: The third preset rule is set according to the different steel grade characteristics when the different steel grades are cast together; the third preset rule is a rule for controlling the pulling speed of the molten steel mixing process when different steel grades are cast together according to the target production requirements, wherein the pulling speed of the molten steel mixing process is controlled, including: The pulling speed during the mixing process of molten steel of different steel grades is controlled to be less than 4.6m / min.

8. A production control system for different steel grades for a thin slab continuous casting machine, applied to the production control method for different steel grades for a thin slab continuous casting machine as claimed in any one of claims 1 to 7, characterized in that: include: A production plan arrangement module is used to arrange the production plan of different steel grade group casting according to the first preset rule to obtain a target production plan; The first preset rule is a rule for arranging steel grades having preset similarity in chemical composition and steel grade characteristics together for continuous casting; A cone adjustment timing selection module is used to obtain the online cone adjustment timing of the different steel grade group casting based on the target production plan; The module for controlling the composition and superheat of the molten steel when mixing different steel grades is used to set a second preset rule according to the composition and superheat of the molten steel when mixing different steel grades; the second preset rule is a rule for controlling the sulfur content, phosphorus content, hydrogen content and superheat of the molten steel when mixing different steel grades according to target production requirements; The casting speed control module for mixed casting of different steel grades is used to set a third preset rule according to the different steel grade characteristics when the different steel grades are cast together; the third preset rule is a rule for controlling the casting speed of the molten steel mixing process when different steel grades are mixed according to the target production requirements; The production control module for group casting of different steel grades is used to control the production process of the group casting of different steel grades through the online cone adjustment timing of the group casting of different steel grades, the second preset rule and the third preset rule.

9. An electronic device, comprising: A memory and a processor, wherein the processor is used to implement the steps of the different steel grade group casting production control method of a thin slab continuous casting machine 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 steps of the method for controlling production of different steel grade group casting of a thin slab continuous casting machine according to any one of claims 1 to 7 are implemented.

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