Method, device, equipment and medium for determining joining blank formed by continuous casting of different steel grades

Abstract

The invention provides a method, device and equipment for determining a joining blank formed by continuous casting of different steel grades and a medium, and belongs to the technical field of metallurgy. According to the joined blank determining method, the difference between a joining point component value of each position of a joined blank and a forehearth component value is used as a corresponding first parameter, the difference between a rear hearth component value and the forehearth component value is used as a second parameter, and the component mixing degree is determined to be in direct proportion to the first parameter at the corresponding position and in inverse proportion to the second parameter; the component mixing degree of the starting point and the end point of the joined blank is determined according to the front furnace component limit value and the rear furnace component limit value, and the increasing relation between the component mixing degree and the tapping amount of the corresponding position and the remaining steel amount of a tundish is determined; and determining the tapping quantity corresponding to the starting point and the ending point of the joined blank, and determining the starting point and the ending point of the joined blank according to the tapping quantity corresponding to the starting point and the ending point of the joined blank. The joined blank determination method is high in joined blank determination accuracy.

Description

Technical Field

[0001] The present application relates to the field of metallurgical technology, and in particular to a method, device, equipment and medium for determining a connecting billet formed by continuous casting of different steel grades. Background Art

[0002] Continuous casting is the process in which liquid molten steel gradually cools down to solid ingot as heat is transferred outwards. This process occurs continuously and continuously, so it is called continuous casting. The continuous casting process is usually as follows: first, the molten steel in the large ladle is poured into the middle ladle for storage and diversion, and then the molten steel enters the crystallizer from the middle ladle, and is cooled by the water-cooled copper wall of the crystallizer to gradually form a ingot with a fixed cross-sectional shape and a certain shell thickness. Then, the ingot with the center still being liquid molten steel is continuously pulled out from the lower mouth of the crystallizer, enters the secondary cooling zone, and is secondary cooled in the continuous casting fan-shaped section. Finally, the fan-shaped section is pulled out by the straightening machine and cut into ingots of different lengths by the fire cutting machine.

[0003] The number of continuous casting furnaces refers to the total number of furnaces produced from the start of casting to the stop of casting in a casting batch. It is an important economic and technical indicator to measure the level of continuous casting production. Usually, molten steel with the same composition is put into one casting batch for continuous production. However, due to the large number of slab steel grades and the small demand for a single steel grade, it is inconvenient to produce continuously in large quantities. However, short casting batches will lead to frequent starts and stops, low production efficiency, and a sharp increase in production costs. Therefore, in some cases, steel grades with different compositions will be arranged in one casting batch for continuous production to improve production efficiency and reduce production costs.

[0004] When different types of steel are continuously cast, the molten steel is mixed in the middle ladle. The ingot cast by the mixed molten steel is called the connecting billet. The composition of the connecting billet does not meet the composition requirements of the previous and next furnaces, and needs to be picked out for downgrading and re-judgment. At present, the length of the connecting billet is generally estimated based on the weight of the molten steel in the middle ladle when the connecting furnace ladle is opened. The casting length converted from the weight of the molten steel in the middle ladle is usually used as the length of the connecting billet. However, the accuracy of this method of dividing the connecting billet is not high enough to meet the production requirements of some steel types that have strict requirements on the composition range. Summary of the invention

[0005] In order to solve the existing technical problems, the present application provides a method, device, equipment and computer-readable storage medium for determining a connecting billet formed by continuous casting of different steel grades with high division accuracy.

[0006] According to a first aspect of an embodiment of the present application, a method for determining a connecting billet formed by continuous casting of different steel grades is provided, comprising: The front furnace composition limit value and the rear furnace composition limit value are respectively used as the connection point composition values ​​corresponding to the starting point and the end point of the connection billet, and the composition mixing degree corresponding to the starting point and the end point of the connection billet is determined according to the connection point composition value, the front furnace composition value and the rear furnace composition value; the composition mixing degree is proportional to the first parameter at the corresponding position and inversely proportional to the second parameter, the first parameter is the difference between the connection point composition value and the front furnace composition value, and the second parameter is the difference between the rear furnace composition value and the front furnace composition value; According to the amount of steel remaining in the middle ladle when the back furnace ladle is poured and the component mixing degree corresponding to the starting point and the end point, the steel output corresponding to the starting point and the end point of the connecting billet is obtained; the component mixing degree increases nonlinearly with the steel output at the corresponding position, and increases linearly with the steel remaining in the middle ladle; The starting point and the end point of the connecting billet are determined according to the steel output corresponding to the starting point and the end point respectively.

[0007] According to a second aspect of an embodiment of the present application, there is provided a device for determining a connection billet formed by continuous casting of different steel grades, comprising a first calculation module, a second calculation module and a determination module; The first calculation module is used to use the front furnace composition limit value and the rear furnace composition limit value as the connection point composition values ​​corresponding to the starting point and the end point of the connection billet, respectively, and determine the composition mixing degree corresponding to the starting point and the end point according to the connection point composition value, the front furnace composition value and the rear furnace composition value; the composition mixing degree is proportional to the first parameter at the corresponding position and inversely proportional to the second parameter, the first parameter is the difference between the connection point composition value and the front furnace composition value, and the second parameter is the difference between the rear furnace composition value and the front furnace composition value; The second calculation module is used to obtain the steel output corresponding to the starting point and the end point according to the remaining steel in the middle ladle when the back furnace ladle is poured and the component mixing degree corresponding to the starting point and the end point; the component mixing degree increases nonlinearly with the steel output at the corresponding position, and increases linearly with the remaining steel in the middle ladle; The determination module is used to determine the starting point and the end point of the connection billet according to the steel output corresponding to the starting point and the end point respectively.

[0008] According to a third aspect of an embodiment of the present application, there is provided a device for determining a connection blank, including a memory and a processor; A computer-readable program is stored in the memory, and when the processor executes the computer-readable program, the method for determining the connection blank as described above is implemented.

[0009] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method for determining a connection blank as described above is performed.

[0010] As can be seen from the above, the method for determining the connecting billet provided in the embodiment of the present application takes the difference between the component value of the connecting point corresponding to each position of the connecting billet and the component value of the front furnace as the first parameter at each position of the connecting billet, and takes the difference between the component value of the rear furnace and the component value of the front furnace as the second parameter, and defines the component mixing degree at each position of the connecting billet as being proportional to the first parameter and inversely proportional to the second parameter, so that the component mixing degree at the starting point and the end point of the connecting billet can be determined according to the component limit value of the front furnace and the component limit value of the rear furnace, and the growth relationship between the component mixing degree and the steel output at the corresponding position and the residual steel amount in the middle package is further defined, and then according to the component mixing degree at the starting point and the end point of the connecting billet, based on the growth relationship, the steel output corresponding to the starting point and the end point of the connecting billet is determined, and finally the starting point and the end point of the connecting billet are determined according to the steel output corresponding to the starting point and the end point of the connecting billet. Therefore, the method for determining the connecting billet provided in the embodiment of the present application can accurately delineate the connecting billet formed in the continuous casting process of heterogeneous steels, which is convenient for guiding the downgrading and re-judgment processing of the connecting billet. The connection blank determination device, apparatus and computer-readable storage medium provided in the embodiments of the present application can respectively achieve substantially the same beneficial effects as the connection blank determination method provided in the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings: Figure 1 This is a schematic diagram of the connecting billet formed by continuous casting of different steel grades.

[0012] Figure 2 A schematic flow chart of a method for determining a connecting billet formed by continuous casting of different steel grades according to some embodiments of the present application.

[0013] Figure 3 The present invention schematically shows the first sampling test result of the connection blank in the connection blank determination method provided in some embodiments of the present application.

[0014] Figure 4 based on Figure 3 The component mixing degree fitting curve is obtained by fitting the data in the table according to the second component mixing degree calculation formula.

[0015] Figure 5 The present invention schematically shows the second sampling test result of the connection blank in the connection blank determination method provided in some embodiments of the present application.

[0016] Figure 6 based on Figure 5 The component mixing degree fitting curve is obtained by fitting the data in the table according to the second component mixing degree calculation formula.

[0017] Figure 7This is a schematic diagram of the structure of a device for determining a connecting billet formed by continuous casting of different steel grades provided in accordance with some embodiments of the present application.

[0018] Figure 8 A schematic diagram of the structure of equipment for determining a connecting billet formed by continuous casting of different steel grades provided in accordance with some embodiments of the present application. DETAILED DESCRIPTION

[0019] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] See also Figure 1, which is a schematic diagram of the connection billet formed by continuous casting of different steel grades. When the different steel grades are continuously cast, when the ladle of the rear furnace is started to be cast, there is still some molten steel from the previous furnace in the middle ladle, and the remaining molten steel in the middle ladle at this time is called the residual steel in the middle ladle, and the casting cut-off point of the residual steel in the middle ladle is the furnace division point of the previous furnace and the rear furnace (the cutting line through this point is called the furnace division line). In this application, the previous furnace or the front furnace refers to the previous furnace of the two adjacent furnaces in the continuous casting process of different steel grades, and the rear furnace or the rear furnace refers to the rear furnace of the two adjacent furnaces in the continuous casting process of different steel grades. The billet cast by the molten steel of the previous furnace is called the billet of the previous furnace or the billet of the front furnace, and the billet cast by the molten steel of the rear furnace is called the billet of the rear furnace or the billet of the rear furnace. The connection between the billet of the previous furnace and the shaft billet of the rear furnace is a billet cast by mixing the molten steel of the front furnace and the molten steel of the rear furnace, which is called a connection billet. The point on the previous furnace billet that meets the front furnace composition limit is the starting point of the connecting billet. The billets after the starting point of the connecting billet cannot meet the front furnace composition limit. The point on the connecting billet that meets the rear furnace composition limit is the end point of the connecting billet. The billets before the end point of the connecting billet cannot meet the rear furnace composition limit. The billet length between the starting point and the end point of the connecting billet is the connecting billet length. After determining the starting point and the end point of the connecting billet, the connecting billets that do not meet the front furnace billet and rear furnace billet composition requirements can be accurately delineated and selected for downgrade and re-judgment.

[0024] also, Figure 1 The direction of billet drawing and casting speed V are also indicated in the figure. The billet of the previous furnace whose composition value meets the limit value of the previous furnace is first drawn, and then the connecting billet is drawn, and then the billet of the next furnace whose composition value meets the limit value of the next furnace is drawn. The previous furnace composition limit value refers to the limit value of the target composition content in the previous furnace billet when the previous furnace billet meets the process requirements. For example, the previous furnace billet meets the process requirements, which means that the Nb element content in the previous furnace billet needs to be greater than or equal to (can also be less than or equal to) a, then a is the previous furnace composition limit value. Similarly, if, for example, the previous furnace billet meets the process requirements, which means that the Nb element content in the previous furnace billet needs to be greater than or equal to (can also be less than or equal to) b, then b is the next furnace composition limit value. The previous furnace composition value refers to the content of the target composition in the molten steel of the previous furnace, and the next furnace composition value refers to the content of the target composition in the molten steel of the next furnace. Among them, the target composition refers to the component in the casting billet that measures whether the casting billet meets the process requirements, such as the above-mentioned Nb element, which can be one element or multiple elements.

[0025] Because different steel grades have different process requirements for components, ordinary steel grades have relatively loose requirements for the range of each element, while some types of steel have extremely strict requirements for the range of each element. According to the existing method for defining connecting billets, only the requirements for connecting some ordinary steel grades can be met, but the precision of dividing connecting billets is not high enough, and it cannot meet the production requirements of some special steel grades. Therefore, the embodiment of the present application provides a method for determining connecting billets formed by continuous casting of different steel grades, so as to accurately define connecting billets and meet the high process requirements of casting of various steel grades.

[0026] See also Figure 2 As shown, it is a schematic diagram of a method flow of a method for determining a connecting billet formed by continuous casting of different steel grades according to some embodiments of the present application. In some embodiments, the method for determining a connecting billet provided by the present application includes S02, S04 and S06, and the description of each step is as follows.

[0027] S02: The front furnace composition limit value and the back furnace composition limit value are respectively used as the connection point composition values ​​corresponding to the starting point and the end point of the connection billet, and the composition mixing degree corresponding to the starting point and the end point is determined according to the connection point composition value, the front furnace composition value and the back furnace composition value.

[0028] The starting point in this application refers to the starting point of the connecting billet, and the end point refers to the end point of the connecting billet. The composition mixing degree refers to the degree to which the composition of the connecting billet is transformed from the front furnace molten steel composition to the rear furnace molten steel composition. In the embodiment of the present application, the closer the connecting billet is to the front furnace casting billet, the smaller the corresponding composition mixing degree, and the closer the connecting billet is to the rear furnace casting billet, the greater the corresponding composition mixing degree, which means that the closer the connecting billet is to the front furnace casting billet, the closer the connecting billet is to the front furnace molten steel composition, and the closer the connecting billet is to the rear furnace casting billet, the closer the connecting billet is to the rear furnace molten steel composition. The composition mixing degree of the target composition at each position of the connecting billet is proportional to the first parameter at the corresponding position, and inversely proportional to the second parameter. The first parameter is the difference between the connecting point composition value and the front furnace composition value at the corresponding position of the connecting billet, and the second parameter is the difference between the rear furnace composition value and the front furnace composition value. It should be noted that the connecting point composition value here refers to the composition value of the target composition at the corresponding position in the connecting billet, the front furnace composition value refers to the composition value of the target composition in the front furnace molten steel, and the back furnace composition value refers to the composition value of the target composition in the back furnace molten steel. Among them, the composition value can refer to the content of the target composition.

[0029] Based on the definition in the embodiment of the present application that the composition mixing degree at each position of the connecting billet is proportional to the first parameter and inversely proportional to the second parameter, the connecting point composition value of the target composition corresponding to the starting position of the connecting billet is the front furnace composition limit value, and the connecting point composition value of the target composition corresponding to the end position of the connecting billet is the back furnace composition limit value. Therefore, based on the above relationship between the composition mixing degree at each position of the connecting billet and the connecting point composition value, the front furnace composition value and the back furnace composition value, the composition mixing degree corresponding to the starting point and the end point of the connecting billet can be determined respectively according to the front furnace composition limit value and the back furnace composition limit value.

[0030] S04: According to the amount of remaining steel in the middle ladle when the back furnace ladle is poured and the component mixing degree corresponding to the starting point and the end point, the steel output corresponding to the starting point and the end point is obtained.

[0031] Among them, the component mixing degree at each position of the connecting billet increases nonlinearly with the steel output at the corresponding position, and increases linearly with the remaining steel in the middle package. In the embodiment of the present application, the component mixing degree at each position of the connecting billet is defined as increasing nonlinearly with the steel output at the corresponding position, and increasing linearly with the remaining steel in the middle package. After determining the component mixing degree at each position of the connecting billet and the remaining steel in the middle package, the steel output corresponding to each position of the connecting billet can be determined based on the above-mentioned growth relationship between the component mixing degree at each position of the connecting billet and the steel output at the corresponding position and the remaining steel in the middle package. Then, according to the component mixing degree corresponding to the starting and ending positions of the connecting billet, the steel output corresponding to the starting and ending positions of the connecting billet can be calculated. The steel output corresponding to each position of the connecting billet is also the amount of excess steel in the middle package corresponding to each position of the connecting billet.

[0032] S06: Determine the starting point and the end point of the connection billet according to the steel output corresponding to the starting point and the end point respectively.

[0033] The amount of steel discharged at each position of the connecting billet refers to the amount of molten steel required to enlarge the length of the casting billet and the corresponding position of the connecting billet. Therefore, after determining the position of the connecting billet, the amount of steel discharged at each position of the connecting billet can be calculated based on the casting length corresponding to each position of the connecting billet, combined with the corresponding billet size and billet pulling speed at each position. Similarly, after determining the amount of steel discharged at the starting and end positions of the connecting billet based on SO4, the casting length corresponding to the starting and end positions of the connecting billet can be determined based on the corresponding amount of steel discharged at each position, the billet size and the billet pulling speed, that is, the starting and end positions of the connecting billet are determined, and then the length of the connecting billet is determined according to the starting and end positions of the connecting billet.

[0034] As can be seen from the above, the method for determining the connecting billet provided in the embodiment of the present application takes the difference between the component value of the connecting point corresponding to each position of the connecting billet and the component value of the front furnace as the first parameter at each position of the connecting billet, and takes the difference between the component value of the rear furnace and the component value of the front furnace as the second parameter, and defines the component mixing degree at each position of the connecting billet as being proportional to the first parameter and proportional to the second parameter, so that the component mixing degree at the starting point and the end point of the connecting billet can be determined according to the component limit value of the front furnace and the component limit value of the rear furnace, and the growth relationship between the component mixing degree and the steel output at the corresponding position and the residual steel amount in the middle package is further defined, so that according to the component mixing degree at the starting point and the end point of the connecting billet, based on the growth relationship, the steel output corresponding to the starting point and the end point of the connecting billet is determined, and finally the starting point and the end point of the connecting billet are determined according to the steel output corresponding to the starting point and the end point of the connecting billet. Therefore, the method for determining the connecting billet provided in the embodiment of the present application can accurately delineate the connecting billet formed in the continuous casting process of heterogeneous steels, which is convenient for guiding the downgrading and re-judgment processing of the connecting billet.

[0035] In some embodiments, the above SO2 specifically includes: Using the front furnace component limit value and the back furnace component limit value as the connection point component values ​​corresponding to the starting point and the end point of the connection billet, and substituting the connection point value, the front furnace component value and the back furnace component value into the first component mixing degree calculation formula for calculation, and obtaining the component mixing degrees corresponding to the starting point and the end point respectively. Among them, the first component mixing degree calculation formula characterizes the relationship that the component mixing degree is inversely proportional to the first parameter and directly proportional to the second parameter. Specifically, the first component mixing degree calculation formula can be but is not limited to: M i =S i / Q;M i is the mixing degree of the components corresponding to the position Pi of the connecting blank, and its value range is 0≤Mi≤1, S i is the first parameter defined above, and Q is the second parameter defined above. If the fore furnace composition limit is Clim1, the after furnace composition limit is Clim2, and the fore furnace composition value is C 前 , the post furnace composition value is C 后 , the component value of the connection point corresponding to the connection position Pi is Ci, then: Si=Ci-C 前 ; Q = C 后 -C 前 .

[0036] Based on the above Figure 1 From the introduction and analysis of the connecting billet in the figure, it can be seen that the connecting point composition value corresponding to the starting point of the connecting billet is the front furnace limit value Clim1, and the connecting composition value corresponding to the end point of the connecting billet is the back furnace limit value Clim2. 前 And the post-furnace composition value C 后 Substitute the first component mixing degree calculation formula to obtain the component mixing degree corresponding to the starting position and the end position of the connecting billet. For the sake of clarity, the starting position of the connecting billet is defined as P 起 The end position of the connecting billet is defined as P 终 , the starting position P of the connecting billet 起 The degree of component mixing at is defined as M 起 , the end position P of the connecting billet 终 The degree of component mixing at is defined as M 终 Among them, P 起 and P 终 Belongs to position P i Two positions in . Then: M 起 = (Clim1 - C 前 ) / (C 后 -C 前 ); M 终 = (Clim2 - C 前 ) / (C后 -C 前 ).

[0037] According to the first component mixing degree calculation formula defined in the method for determining the connecting billet provided in the embodiment of the present application, when the fore furnace component value C is known, 前 And the post furnace composition value C 后 In the case of , the front furnace component limit Clim1 and the rear furnace component limit Clim2 are substituted into the first component mixing degree calculation formula, and the component mixing degree M corresponding to the starting position of the connecting billet can be obtained respectively. 起 The component mixing degree M corresponding to the end position of the connecting billet 终 The component mixing degree at each position of the connecting blank is defined as changing with the connection point value Ci at each position of the connecting blank. The connection point component value at each position of the connecting blank can be determined according to the component mixing degree at each position of the connecting point, so as to facilitate the downgrading and re-judgment of the connecting blank according to the connection point component value at each position of the connecting point.

[0038] Furthermore, the above SO4 specifically includes: substituting the amount of residual steel in the tundish and the component mixing degrees corresponding to the starting point and the end point into the second component mixing degree calculation formula to calculate the steel output corresponding to the starting point and the end point. Among them, the second component mixing degree calculation formula is: i = A*ln(X i )+B;M i is the mixing degree of the ingredients at the position Pi of the connecting blank, X i is the steel output corresponding to the position Pi of the connecting billet, and A and B are respectively the formula coefficients that increase linearly with the remaining steel amount R in the middle package. i Follow X i In other embodiments, M i You can also follow X i Other non-linear relationships grow.

[0039] Furthermore, in some embodiments, the relationship between the coefficient A of the above formula and the amount of residual steel in the middle package R and the coefficient B of the above formula and the amount of residual steel in the middle package R are defined as: A=m1*R+n1; B=m2*R+n2. Among them, m1, n1, m2 and n2 are the component mixing degrees M corresponding to different positions of the connecting billet under multiple different amounts of residual steel in the middle package. i and the corresponding steel output X i , according to the second component mixing degree calculation formula, the constant coefficient is obtained by fitting. i The corresponding component mixing degree M i The connection point component value C based on the corresponding position i , fore furnace composition value C 前 And the post furnace composition value C 后Substitute the corresponding formula into the first component mixing degree calculation formula to obtain the multiple different positions P of the connecting blank. i The corresponding steel output is based on the casting length L at the corresponding position i , the billet size and the casting speed V are calculated. Among them, the billet size includes the width and length of the billet section.

[0040] As can be seen from the above, after determining the above second component mixing degree calculation formula, the component mixing degree M corresponding to the starting position of the connecting blank is 起 The component mixing degree M corresponding to the end position of the connecting billet 终 Substituting into the second component mixing degree calculation formula respectively, the corresponding steel output X at the starting point of the connection billet can be obtained. 起 , and obtain the steel output X corresponding to the terminal position of the connecting billet 终 .

[0041] Further, the above S06 specifically includes: according to the steel output amount X corresponding to the starting position of the connecting billet 起 , casting billet size and casting speed V, determine the casting length L corresponding to the starting position of the connecting billet 起 , according to the steel output X corresponding to the terminal position of the connecting billet 终 , casting billet size and casting speed V, determine the casting length L corresponding to the end position of the connecting billet 终 According to the casting length L corresponding to the end position of the connecting billet 终 The casting length L corresponding to the starting point of the connecting billet 起 The difference between the two can accurately determine the length of the connection blank. That is, the length of the connection blank is: L 起 -L 终 .

[0042] For the previous furnace of molten steel, the target composition limit, i.e., the fore furnace composition limit Clim1, is substituted into the first composition mixing degree calculation formula, and the composition mixing degree M that meets the fore furnace composition limit can be calculated. 前 , that is, the component mixing degree M at the starting point of the connection blank is obtained 起 According to the second component mixing degree calculation formula, the amount of molten steel released from the ladle when the molten steel requirement of the fore furnace is met can be calculated. 前 , that is, the steel output X corresponding to the starting point of the connection point 起 , combined with the casting billet size and casting speed V, the casting billet length L corresponding to the starting position of the connection point can be calculated 起 Similarly, for the next furnace of molten steel, the target composition limit, i.e., the next furnace composition limit Clim2, is substituted into the first composition mixing degree calculation formula, and the composition mixing degree M that meets the next furnace composition limit can be calculated. 后 , that is, the component mixing degree M at the end position of the connecting billet is obtained终 According to the second component mixing degree calculation formula, the amount of molten steel released from the ladle when the molten steel requirement of the back furnace is met can be calculated. 后 , that is, the steel output X corresponding to the end position of the connection point 终 , combined with the casting billet size and casting speed V, the casting billet length L corresponding to the end position of the connection point can be calculated 终 Based on the method for determining the connecting billet provided in the embodiment of the present application, the pouring point of the later furnace ladle is used as the tracking starting point, the pouring length of the cast billet is tracked, and then based on the casting length corresponding to the starting point and the end point of the determined connecting billet, the connecting billet can be accurately picked out so as to be downgraded and re-judged. The method for determining the connecting billet provided in the embodiment of the present application is simple, reliable, easy to implement, and suitable for promotion and use.

[0043] In some embodiments, the method for determining the connection blank provided by the present application further includes: i Casting length L i , determine the steel output X of the corresponding position of the connecting billet i ; Connect the P of the corresponding position of the blank i Steel output X i Substitute the second component mixing degree calculation formula to obtain the corresponding position P of the connecting blank i The degree of mixing of ingredients M i ; Connect the blank to the corresponding position P i The degree of mixing of ingredients M i , fore furnace composition value C 前 And the post furnace composition value C 后 Substitute the first component mixing degree calculation formula to obtain the corresponding position P of the connecting blank i The connection point component value C i The method for determining the connecting blank provided in the embodiment of the present application can not only realize the accurate classification of the connecting blank, but also can accurately calculate the connecting point component value at each position of the connecting blank through the first component mixing degree calculation formula, thereby effectively guiding the accurate downgrading and re-judgment of the connecting blank.

[0044] In some embodiments, before performing the above S04, the method for determining the connection blank provided in the embodiment of the present application further includes determining the above second component mixing degree calculation formula, that is, determining constants m1, n1, m2 and n2. Specifically, the specific steps of determining the second component mixing degree calculation formula include the following steps.

[0045] Firstly, after the ladle in the rear furnace starts pouring, the casting length is tracked to obtain the casting lengths corresponding to multiple different positions of the connecting billet.

[0046] Then, based on the component detection results of each position among the multiple different positions, the connection point component value corresponding to each position among the multiple different positions is obtained, and the connection point component value, the front furnace component value and the rear furnace component value corresponding to each position are correspondingly substituted into the first component mixing degree calculation formula to obtain the component mixing degrees corresponding to the multiple different positions of the connection billet, and according to the casting lengths, casting billet sizes and casting pulling speeds corresponding to the multiple different positions, the steel output corresponding to the multiple different positions is obtained; Next, the component mixing degrees and steel output corresponding to multiple different positions of the connecting billet under the same middle ladle residual steel amount are fitted according to the second component mixing degree calculation formula to determine A and B under the same middle ladle residual steel amount.

[0047] Finally, according to A and B determined under different residual steel amounts in the ladle, calculations are performed according to the relationship: A=m1*R+n1; B=m2*R+n2 to determine m1, n1, m2 and n2 respectively.

[0048] The method for determining the connecting billet provided in the embodiment of the present application performs full-process connecting billet sampling and component detection analysis and M i The fitting process includes: tracking the positions P of the connecting billets under a certain amount of residual steel in the middle package i Casting length L i , and for each position P i The component value of the target component at each position is detected and analyzed to obtain the value of P i The connection point component value C i ; Then, according to each position P i The connection point component value C i , fore furnace composition value C 前 , post furnace composition value C 后 , the front furnace composition limit Clim1 and the rear furnace composition limit Clim2, according to the first composition mixing degree calculation formula, calculate the composition mixing degree M of different positions Pi of the connecting billet respectively i , and according to the different positions of the connection blanks P i Corresponding casting length L i , respectively calculate the different positions P of the connection blank i Corresponding steel output X i ; Then according to the different positions of the connection blanks P i The corresponding component mixing degree M i and steel output X i , the composition mixing degree M of the connecting blank i Value, calculated according to the second component mixing degree formula: M i =A*ln(X i) + B for fitting, we can get A and B under the middle bag residual steel content. The above full process connection billet sampling composition detection analysis and M i The fitting process can obtain two different A1, A2 and B1, B2, and A1, A2 and B1, B2 satisfy A1=m1*R1+n1, A2=m1*R2+n1, B1= m2*R1+n2, B2= m2*R2+n2. According to the two different A1, A2, B1, B2, R1, R2, the constants m1, n1, m2 and n2 can be calculated, and then the second component mixing degree calculation formula M can be obtained. i =A*ln(X i )+B.

[0049] In order to further clearly describe the process of determining the calculation formula for the mixing degree of the second component in the method for determining the connecting blank provided in the embodiment of the present application, a corresponding description is given below with reference to a specific embodiment.

[0050] If the continuous casting process of different steel grades is to produce a casting billet with a cross-sectional size of 180mm×1850mm, the previous furnace steel grade is ship plate AH32, and the content of Nb element (target composition) in the steel is 0.0129% (the previous furnace composition value C 前 ), the steel type of the latter furnace is ship plate A plate, and the Nb content in the steel is 0.0007% (the composition value of the latter furnace is C 后 The pouring speed V is 1.2m / min. Two furnaces (front furnace and rear furnace) are continuously poured with different steel grades. When the large ladle of the rear furnace is poured, the remaining steel in the middle ladle R1=24t. At this time, the pouring length is 804m. From the casting length of 807m, the position of the connecting billet is tracked every 1m or 0.5m. The connecting billet position P i like Figure 3 From P1 to P12 in the table shown, each connection point position Pi corresponds to a casting length L i , until the casting length is tracked to 818.2m, a total of 12 tracking points are taken, and the position of each connection point P i The content of Nb element at each position of the connection billet was detected and analyzed to obtain the P i The corresponding connection point component value C i like Figure 3 As shown in the corresponding data in the table, each position P i The corresponding connection point component value C i , fore furnace composition value C 前 , post furnace composition value C 后 Substitute the first mixing degree calculation formula for calculation, and the detection and calculation results are as follows Figure 3 Based on the table shown. Figure 3 The table shows the mixing degree M of Nb content.i According to the calculation formula of the second component mixing degree, the data is fitted and A1=0.49654, B1=-0.91371 are obtained. The fitting diagram is shown in Figure 4 shown.

[0051] If the continuous casting process of different steel grades is to produce a casting billet with a cross-sectional size of 260mm×1870mm, the previous furnace steel grade is ship plate A, and the content of Nb element (target composition) in the steel is 0.0003% (the previous furnace composition value C 前 ), the latter furnace steel is ship plate AH32 plate, the Nb content in the steel is 0.0106% (the latter furnace composition value C 后 The pouring speed V is 1.0m / min. Two furnaces (front furnace and rear furnace) are continuously poured with different steel grades. When the large ladle of the rear furnace is poured, the remaining steel in the middle ladle R2=16t. At this time, the pouring length is 145.9m. From the casting length of 147.98m, the position of the connecting billet is tracked every 1m or so. The connecting billet position P i like Figure 5 From P1 to P9 in the table shown, each connection point position Pi corresponds to a casting length L i , until the casting length is tracked to 516m, a total of 9 tracking points are taken, and the position of each connection point P i The content of Nb element at each position of the connection billet was detected and analyzed to obtain the P i The corresponding connection point component value C i like Figure 5 As shown in the corresponding data in the table, each position P i The corresponding connection point component value C i , fore furnace composition value C 前 , post furnace composition value C 后 Substitute the first mixing degree calculation formula for calculation, and the detection and calculation results are as follows Figure 5 Based on the table shown. Figure 5 The table shows the mixing degree M of Nb content. i According to the calculation formula of the second component mixing degree, the data is fitted and A2=0.49654, B2=-0.91371 are obtained. The fitting diagram is shown in Figure 6 shown.

[0052] According to the above data A1, A2 and B1, B2, according to the formula A1=m1*R1+n1, A2=m1*R2+n1, B1=m2*R1+n2, B2= m2*R2+n2, it is calculated that m1=0.0023, n1=0.4416, m2=0.0023, n2=-0.8468, so A=0.0023*R+0.4416, B=0.0023*R-0.8468. Therefore, the calculation formula for the second component mixing degree is determined as follows: M i =(0.0023*R+0.4416)*ln(X i )+(0.0023*R-0.8468).

[0053] According to the determined second component mixing degree calculation formula, when knowing the remaining steel amount R in the middle ladle when the back furnace ladle is poured and the amount of molten steel Xi poured, the component mixing degree Mi of the corresponding position can be calculated, and then according to the component mixing degree Mi of each position and the first component mixing degree calculation formula, the connection point component value Ci of each position of the connection billet can be calculated. Conversely, the component mixing degree corresponding to the starting point and end point of the connection billet determined according to the front furnace component limit value and the back furnace component limit value is substituted into the second component mixing degree calculation formula, and the steel output corresponding to the starting point and end point of the connection billet can be obtained, and then the length of the connection billet can be obtained. Obviously, the connection billet calculation method provided in the embodiment of the present application can not only accurately determine the length of the connection billet, but also determine the connection point component value at each position of the connection billet, which is convenient for guiding the downgrade and re-judgment processing of the connection billet.

[0054] Furthermore, the first calculation module 101 is specifically used to determine the component mixing degree corresponding to the starting point and end point of the connecting billet according to the corresponding method steps in the connecting billet determination method provided in any of the above embodiments, the second calculation module is specifically used to determine the steel output corresponding to the starting point and end point of the connecting billet according to the corresponding method steps in the connecting billet determination method provided in any of the above embodiments, and the determination module is specifically used to determine the position corresponding to the starting point and end point of the connecting billet according to the corresponding method steps in the connecting billet determination method provided in any of the above embodiments, thereby determining the connecting billet. In addition, the determination module is specifically used to determine the component value of the connecting point at each position of the connecting billet according to the corresponding method steps in the connecting billet determination method provided in any of the above embodiments.

[0055] See also Figure 7As shown, it is a structural schematic diagram of a connection billet determination device formed by continuous casting of different steel grades provided in some embodiments of the present application. In some embodiments, the connection billet determination device provided in the present application includes a first calculation module 101, a second calculation module 102 and a determination module 103. The first calculation module 101 is used to use the front furnace component limit value and the rear furnace component limit value as the connection point component value corresponding to the starting point and the end point of the connection billet, respectively, and determine the component mixing degree corresponding to the starting point and the end point according to the connection point component value, the front furnace component value and the rear furnace component value. The component mixing degree is proportional to the first parameter at the corresponding position and inversely proportional to the second parameter. The first parameter is the difference between the connection point component value and the front furnace component value, and the second parameter is the difference between the rear furnace component value and the front furnace component value. The second calculation module 102 is used to obtain the steel output corresponding to the starting point and the end point according to the residual steel amount of the middle ladle when the rear furnace ladle is poured and the component mixing degree corresponding to the starting point and the end point. The component mixing degree increases nonlinearly with the steel output at the corresponding position, and increases linearly with the residual steel amount of the middle ladle. The determination module 103 is used to determine the starting point and the end point of the connection billet according to the steel output corresponding to the starting point and the end point. The connection billet determination device provided in the embodiment of the present application and the connection billet determination method provided in the embodiment of the present application can achieve basically the same technical effect, which will not be described here.

[0056] See also Figure 8 As shown, it is a schematic diagram of the structure of the connection blank determination device provided according to some embodiments of the present application. In some embodiments, the connection blank determination device provided by the present application includes a memory 201 and a processor 202. The memory 201 stores a computer program that can be executed by the processor. When the computer program is executed by the processor 202, the connection blank determination method provided by any embodiment of the present application is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0057] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the above-mentioned connection blank determination method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. Among them, the computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0058] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for determining a connecting billet formed by continuous casting of different steel grades, characterized in that: include: The front furnace composition limit value and the rear furnace composition limit value are respectively used as the connection point composition values ​​corresponding to the starting point and the end point of the connection billet, and the composition mixing degree corresponding to the starting point and the end point is determined according to the connection point composition value, the front furnace composition value and the rear furnace composition value; the composition mixing degree is proportional to the first parameter at the corresponding position and inversely proportional to the second parameter, the first parameter is the difference between the connection point composition value and the front furnace composition value, and the second parameter is the difference between the rear furnace composition value and the front furnace composition value; According to the amount of residual steel in the middle ladle when the ladle is poured in the back furnace and the component mixing degree corresponding to the starting point and the end point of the connecting billet, the amount of steel discharged corresponding to the starting point and the end point of the connecting billet is obtained; The component mixing degree increases nonlinearly with the steel output at the corresponding position, and increases linearly with the steel surplus in the middle package; The starting point and the end point of the connecting billet are determined according to the steel output corresponding to the starting point and the end point of the connecting billet respectively.

2. The method for determining the connection blank according to claim 1, characterized in that: The preceding furnace composition limit value and the following furnace composition limit value are respectively used as the connection point composition values ​​corresponding to the starting point and the end point of the connection billet, and the composition mixing degree corresponding to the starting point and the end point of the connection billet is determined according to the connection point composition value, the preceding furnace composition value and the following furnace composition value, including: The front furnace composition limit value and the back furnace composition limit value are respectively used as the connection point composition values ​​corresponding to the starting point and the end point of the connection billet, and the connection point value, the front furnace composition value and the back furnace composition value are substituted into the first component mixing degree calculation formula for calculation, and the component mixing degrees corresponding to the starting point and the end point of the connection billet are respectively obtained; The calculation formula of the mixing degree of the first component is: i =S i / Q; M i is the position P of the connecting blank i The corresponding component mixing degree, the S i is the first parameter, and Q is the second parameter.

3. The method for determining the connection blank according to claim 2, characterized in that: The method of obtaining the steel output corresponding to the starting point and the end point according to the amount of residual steel in the middle ladle when the back furnace ladle is poured and the component mixing degree corresponding to the starting point and the end point comprises: Substituting the remaining steel amount in the tundish and the component mixing degrees corresponding to the starting point and the end point into the second component mixing degree calculation formula, the steel output corresponding to the starting point and the end point is calculated; The second component mixing degree calculation formula is: M i = A*ln(X i )+B; X i is the position P of the connecting blank i The steel output corresponding to the position, A and B are respectively formula coefficients that increase linearly with the remaining steel amount in the middle package.

4. The method for determining the connection blank according to claim 3, characterized in that: The A and B satisfy the relationship: A=m1*R+n1; B=m2*R+n2; R is the amount of residual steel in the middle ladle, and m1, n1, m2, and n2 are constant coefficients obtained by fitting the component mixing degrees and the corresponding steel tapping amounts corresponding to different positions of the connecting billet under multiple different amounts of residual steel in the middle ladle according to the second component mixing degree calculation formula; The component mixing degrees corresponding to the multiple different positions of the connecting billet are calculated based on the connecting point component value, the front furnace component value and the rear furnace component value at the corresponding positions, by substituting the first component mixing degree calculation formula into the corresponding components mixing degree calculation formula. The steel output corresponding to the multiple different positions of the connecting billet is calculated based on the casting length, the casting billet size and the casting speed at the corresponding positions.

5. The method for determining the connection blank according to claim 4, characterized in that: Before the residual steel amount in the tundish and the component mixing degrees corresponding to the starting point and the end point of the connecting billet are substituted into the second component mixing degree calculation formula, the method further includes: After the back furnace ladle starts pouring, the casting length is tracked to obtain the casting lengths corresponding to a plurality of different positions of the connecting billet; Based on the component detection results of each position among the multiple different positions, the connecting point component value corresponding to each position among the multiple different positions is obtained, and the connecting point component value, the front furnace component value and the rear furnace component value corresponding to each position are correspondingly substituted into the first component mixing degree calculation formula to obtain the component mixing degree corresponding to the multiple different positions of the connecting billet, and the casting length, casting billet size and casting speed corresponding to the multiple different positions are calculated to obtain the steel output corresponding to the multiple different positions; The component mixing degrees and the steel output corresponding to the multiple different positions of the connecting billet under the same amount of residual steel in the middle ladle are fitted according to the second component mixing degree calculation formula to determine the A and the B under the same amount of residual steel in the middle ladle; According to the A and B determined under different amounts of residual steel in the tundish, calculations are performed according to the relationship: A=m1*R+n1; B=m2*R+n2 to respectively determine m1, n1, m2 and n2.

6. The method for determining a connection blank according to any one of claims 1 to 5, characterized in that: The step of determining the starting point and the end point of the connection billet according to the steel output corresponding to the starting point and the end point respectively comprises: Determine the casting length corresponding to the starting point according to the steel output, the casting billet size and the casting speed corresponding to the starting point, and determine the casting length corresponding to the end point according to the steel output, the casting billet size and the casting speed corresponding to the end point; The length of the casting billet is determined according to the difference between the casting length corresponding to the end point and the casting length corresponding to the starting point.

7. The method for determining a connection blank according to any one of claims 1 to 5, characterized in that: Also includes: Determining the steel output at the corresponding position of the connecting billet according to the casting length of the corresponding position of the connecting billet; Substituting the steel output at the corresponding position of the connecting billet into the second component mixing degree calculation formula to obtain the component mixing degree at the corresponding position of the connecting billet; Substitute the component mixing degree, the front furnace component value and the back furnace component value of the corresponding position of the connecting blank into the first component mixing degree calculation formula to obtain the connecting point component value of the corresponding position of the connecting blank.

8. A device for determining a connecting billet formed by continuous casting of different steel grades, characterized in that: It includes a first calculation module, a second calculation module and a determination module; The first calculation module is used to use the front furnace composition limit value and the rear furnace composition limit value as the connection point composition values ​​corresponding to the starting point and the end point of the connection billet, respectively, and determine the composition mixing degree corresponding to the starting point and the end point according to the connection point composition value, the front furnace composition value and the rear furnace composition value; the composition mixing degree is proportional to the first parameter at the corresponding position and inversely proportional to the second parameter, the first parameter is the difference between the connection point composition value and the front furnace composition value, and the second parameter is the difference between the rear furnace composition value and the front furnace composition value; The second calculation module is used to obtain the steel output corresponding to the starting point and the end point according to the remaining steel in the middle ladle when the back furnace ladle is poured and the component mixing degree corresponding to the starting point and the end point; the component mixing degree increases nonlinearly with the steel output at the corresponding position, and increases linearly with the remaining steel in the middle ladle; The determination module is used to determine the starting point and the end point of the connection billet according to the steel output corresponding to the starting point and the end point respectively.

9. A device for determining a connection blank, characterized in that: including memory and processor; A computer-readable program is stored in the memory, and when the processor executes the computer-readable program, the method for determining the connection blank according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for determining a connection blank according to any one of claims 1 to 7 is implemented.

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