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

Abstract

The application provides a method, device, equipment and medium for determining a connecting blank formed by continuous casting of different steel grades, and belongs to the technical field of metallurgy. The method for determining the connecting blank takes the difference between the composition value of the connecting point of each position of the connecting blank and the composition value of the forehearth as a corresponding first parameter, takes the difference between the composition value of the backhearth and the composition value of the forehearth as a second parameter, and determines the composition mixing degree to be proportional to the first parameter at the corresponding position and inversely proportional to the second parameter. The composition mixing degree of the starting point and the ending point of the connecting blank is determined according to the composition limit value of the forehearth and the composition limit value of the backhearth, and the growth relationship between the tapping amount of the corresponding position and the composition mixing degree and the remaining steel amount of the tundish is determined. Then, the tapping amount corresponding to the starting point and the ending point of the connecting blank is determined according to the composition mixing degree of the starting point and the ending point of the connecting blank, and the starting point and the ending point of the connecting blank are determined according to the tapping amount corresponding to the starting point and the ending point of the connecting blank. The method for determining the connecting blank has high determination accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgy, and in particular to a method, device, equipment and medium for determining a linking slab formed by continuous casting of different steel grades. BACKGROUND

[0002] Continuous casting is a process in which liquid molten steel is gradually cooled to solid cast slab with heat transfer to the outside. This process is continuously ongoing, so it is called continuous casting. The process of continuous casting is generally as follows: first, the molten steel in the ladle is poured into the tundish for storage and distribution, and then the molten steel is poured from the tundish into the mold, cooled by the water-cooled copper wall of the mold, and gradually forms a cast slab with a fixed cross-sectional shape and a certain shell thickness. Then, the cast slab with a liquid center is continuously pulled out of the lower opening of the mold, enters the secondary cooling zone, and is subjected to secondary cooling in the continuous casting sector. Finally, the cast slab is cut into different lengths by the fire cutting machine after being pulled out of the sector by the puller-straightener.

[0003] The number of continuous casting furnaces refers to the total number of furnaces from the start of pouring to the stop of pouring in one pouring. It is an important economic and technical indicator for measuring the level of continuous casting production. Usually, molten steel with the same composition is poured continuously in one pouring. However, due to the large number of slab steel grades and the small demand for single steel grade, it is not convenient to produce in large quantities continuously. However, producing short pourings will lead to frequent start and stop of pouring, low production efficiency, and sharp increase in production cost. Therefore, in some cases, molten steel with different compositions is poured continuously in one pouring to improve production efficiency and reduce production cost.

[0004] When different composition steels are continuously cast, the molten steel is mixed in the tundish, and the cast slab poured from the mixed molten steel is called a linking slab. The composition of the linking slab does not meet the composition requirements of the previous and subsequent furnace, and needs to be picked out for downgrading and judgment. Currently, the length of the linking slab is usually estimated according to the weight of the tundish molten steel when the ladle of the linking furnace is opened. The pouring length converted from the weight of the tundish molten steel is usually used as the length of the linking slab. However, the precision of this linking slab division method is not high enough to meet the production requirements of some steel grades with strict composition range requirements. SUMMARY

[0005] To solve the existing technical problems, the present application provides a method, device, equipment and computer readable storage medium for determining a linking slab formed by continuous casting of different steel grades with high division precision.

[0006] According to a first aspect of an embodiment of the present application, a method for determining a linking slab formed by continuous casting of different steel grades is provided, comprising:

[0007] The composition mixing degree corresponding to the start point and the end point of the linking slab is determined according to the linking point composition value, the composition limit value of the forehearth and the composition limit value of the backhearth; 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 linking point composition value and the composition limit value of the forehearth, and the second parameter is the difference between the composition limit value of the backhearth and the composition limit value of the forehearth;

[0008] The tapping quantity corresponding to the start point and the end point of the linking slab is obtained according to the tundish residual steel quantity when the backhearth ladle is opened and the composition mixing degree corresponding to the start point and the end point; the composition mixing degree nonlinearly increases with the tapping quantity at the corresponding position and linearly increases with the tundish residual steel quantity;

[0009] The start point and the end point of the linking slab are determined according to the tapping quantity corresponding to the start point and the end point, respectively.

[0010] According to a second aspect of the embodiment of the present application, a linking slab determination device formed by different steel grades continuous casting is provided, comprising a first calculation module, a second calculation module and a determination module;

[0011] The first calculation module is used to determine the composition mixing degree corresponding to the start point and the end point according to the linking point composition value, the composition limit value of the forehearth and the composition limit value of the backhearth, wherein the composition limit value of the forehearth and the composition limit value of the backhearth are respectively taken as the linking point composition value corresponding to the start point and the end point of the linking slab; 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 linking point composition value and the composition limit value of the forehearth, and the second parameter is the difference between the composition limit value of the backhearth and the composition limit value of the forehearth;

[0012] The second calculation module is used to obtain the tapping quantity corresponding to the start point and the end point according to the tundish residual steel quantity when the backhearth ladle is opened and the composition mixing degree corresponding to the start point and the end point; the composition mixing degree nonlinearly increases with the tapping quantity at the corresponding position and linearly increases with the tundish residual steel quantity;

[0013] The determination module is used to determine the start point and the end point of the linking slab according to the tapping quantity corresponding to the start point and the end point, respectively.

[0014] According to a third aspect of the embodiment of the present application, a linking slab determination device is provided, comprising a memory and a processor;

[0015] The memory stores a computer readable program, and the processor realizes the linking slab determination method as described above when executing the computer readable program.

[0016] According to a fourth aspect of the embodiments of the present application, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to perform the method for determining a strand as described above.

[0017] As can be seen from the above, the method for determining a strand according to the embodiments of the present application takes the difference between the composition value of the corresponding connection point at each position of the strand and the composition value of the forehearth as the first parameter at each position of the strand, and takes the difference between the composition value of the backhearth and the composition value of the forehearth as the second parameter. The composition mixing degree at each position of the strand is defined as being proportional to the first parameter and inversely proportional to the second parameter. Thus, the composition mixing degree at the start point and the end point of the strand can be determined according to the composition limit value of the forehearth and the composition limit value of the backhearth. Furthermore, the growth relationship between the composition mixing degree and the tapping amount at the corresponding position and the remaining steel amount in the tundish is defined. Then, the tapping amount corresponding to the start point and the end point of the strand is determined according to the composition mixing degree at the start point and the end point of the strand and based on the growth relationship. Finally, the start point and the end point of the strand are determined according to the tapping amount corresponding to the start point and the end point of the strand. Therefore, the method for determining a strand according to the embodiments of the present application can accurately determine the strand formed in the different-steel continuous casting process, which is convenient for guiding the degradation and rejudgment of the strand. The strand determination device, the apparatus and the computer readable storage medium according to the embodiments of the present application can achieve the same beneficial effects as the method for determining a strand according to the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0019] Figure 1 A schematic diagram of a strand formed by different-steel continuous casting.

[0020] Figure 2 A schematic diagram of a method flow of the method for determining a strand formed by different-steel continuous casting according to some embodiments of the present application.

[0021] Figure 3 An intention of the first sampling detection result of the strand in the method for determining a strand according to some embodiments of the present application.

[0022] Figure 4 Based on Figure 3 A composition mixing degree fitting curve obtained by fitting each data in the table shown in FIG. 8 according to the second composition mixing degree calculation formula.

[0023] Figure 5 An intention of the second sampling detection result of the strand in the method for determining a strand according to some embodiments of the present application.

[0024] Figure 6 Based on Figure 5 The component mixing degree fitting curve is obtained by fitting each data in the table shown above according to a second component mixing degree calculation formula.

[0025] Figure 7 A structure diagram of a device for determining a joining blank formed by continuous casting of different steel grades according to some embodiments of the present application is provided.

[0026] Figure 8 A structure diagram of a device for determining a joining blank formed by continuous casting of different steel grades according to some embodiments of the present application is provided. DETAILED DESCRIPTION

[0027] The technical solutions of the present application are further described in detail below in combination with the accompanying drawings and specific embodiments of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments of the present application, and is not intended to limit the implementation of the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] 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", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Please refer to Figure 1, which is a schematic diagram of the connection blank formed by continuous casting of different steel grades. During continuous casting of different steel grades, the tundish still contains part of the molten steel of the previous furnace when the ladle of the next furnace is opened. The remaining amount of molten steel in the tundish at this time is called the tundish residual steel amount. The casting cutoff point of the tundish residual steel amount is the furnace split point (the cutting line through this point is called the furnace split line) of the previous furnace and the next furnace. In this application, the previous furnace or the front furnace refers to the previous furnace in the two adjacent furnace times in the continuous casting process of different steel grades, the rear furnace or the next furnace refers to the next furnace in the two adjacent furnace times in the continuous casting process of different steel grades, the cast blank cast by the molten steel of the previous furnace is called the previous furnace cast blank or the front furnace cast blank, and the cast blank cast by the molten steel of the next furnace is called the next furnace cast blank or the rear furnace cast blank. The connection point of the previous furnace cast blank and the rear furnace cast blank is the cast blank formed by the mixed casting of the molten steel of the front furnace and the molten steel of the rear furnace, which is called the connection blank. The point on the previous furnace cast blank that meets the composition limit value of the front furnace is the starting point of the connection blank, and the cast blank after the starting point of the connection blank cannot meet the composition limit value of the front furnace. The point on the connection blank that meets the composition limit value of the next furnace is the end point of the connection blank, and the cast blank before the end point of the connection blank cannot meet the composition limit value of the next furnace. The length of the cast blank between the starting point and the end point of the connection blank is the length of the connection blank. After determining the starting point and the end point of the connection blank, the connection blank that does not meet the composition requirements of the previous furnace cast blank and the next furnace cast blank can be accurately demarcated and selected for downgrading and rejudgment.

[0032] In addition, Figure 1 The drawing also shows the drawing direction and the casting speed V. The previous furnace cast blank that meets the composition limit value of the front furnace is drawn out first, then the connection blank is drawn out, and then the next furnace cast blank that meets the composition limit value of the rear furnace is drawn out. The composition limit value of the front furnace refers to the limit value of the target composition content in the previous furnace cast blank when the previous furnace cast blank meets the process requirements. For example, the previous furnace cast blank meets the process requirements means that the Nb element content in the previous furnace cast blank needs to be greater than or equal to (or less than or equal to) a, and a is the composition limit value of the front furnace. Similarly, for example, the previous furnace cast blank meets the process requirements means that the Nb element content in the previous furnace cast blank needs to be greater than or equal to (or less than or equal to) b, and b is the composition limit value of the next furnace. The composition value of the front furnace refers to the content of the target composition in the molten steel of the front furnace, and the composition value of the next furnace refers to the content of the target composition in the molten steel of the next furnace. The target composition refers to the composition in the cast blank that measures whether the cast blank meets the process requirements, such as the Nb element mentioned above, which can be one element or multiple elements.

[0033] Because the process requirements for the composition of different steel grades are different, the range requirements for the composition of ordinary steel grades are relatively loose, while the range requirements for the composition of some special steel grades are extremely strict. According to the existing connection blank demarcation method, only the requirements of some ordinary steel grades during connection can be met, but because the demarcation accuracy of the connection blank is not high enough, the production requirements of some special steel grades cannot be well met. Therefore, the embodiments of the present application provide a connection blank determination method formed by continuous casting of different steel grades to accurately demarcate the connection blank and meet the high process requirements of various steel grades.

[0034] Referring to Figure 2 Fig. 1 is a schematic diagram of a method for determining a linking 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 linking billet provided by the present application comprises S02, S04 and S06, and the description of each step is as follows.

[0035] S02: taking the composition limit value of the forehearth and the composition limit value of the backhearth as the composition values of the linking points corresponding to the starting point and the ending point of the linking billet respectively, and determining the composition mixing degrees corresponding to the starting point and the ending point according to the composition values of the linking points, the composition limit value of the forehearth and the composition limit value of the backhearth.

[0036] The starting point in the present application refers to the starting point of the linking billet, and the ending point refers to the ending point of the linking billet. The composition mixing degree refers to the degree of change of the composition of the linking billet from the composition of the forehearth molten steel to the composition of the backhearth molten steel. In the embodiments of the present application, the closer the linking billet is to the position of the forehearth cast billet, the smaller the composition mixing degree corresponding to the position, and the closer the linking billet is to the position of the backhearth cast billet, the larger the composition mixing degree corresponding to the position, which means that the closer the linking billet is to the position of the forehearth cast billet, the closer the composition of the linking billet is to the composition of the forehearth molten steel, and the closer the linking billet is to the position of the backhearth cast billet, the closer the composition of the linking billet is to the composition of the backhearth molten steel. The composition mixing degree of the linking billet at each position with respect to the target composition is proportional to the first parameter and inversely proportional to the second parameter, the first parameter is the difference between the composition value of the linking point and the composition limit value of the forehearth at the corresponding position of the linking billet with respect to the target composition, and the second parameter is the difference between the composition limit value of the backhearth and the composition limit value of the forehearth. It should be noted that the composition value of the linking point herein refers to the composition value of the target composition at the corresponding position in the linking billet, the composition limit value of the forehearth refers to the composition value of the target composition in the forehearth molten steel, and the composition limit value of the backhearth refers to the composition value of the target composition in the backhearth molten steel. Among them, the composition value can refer to the content of the target composition.

[0037] Based on the composition mixing degree of the linking billet at each position defined in the embodiments of the present application, which is proportional to the first parameter and inversely proportional to the second parameter, the composition value of the linking point of the target composition corresponding to the starting point position of the linking billet is the composition limit value of the forehearth, and the composition value of the linking point of the target composition corresponding to the ending point position of the linking billet is the composition limit value of the backhearth. Therefore, according to the composition limit value of the forehearth and the composition limit value of the backhearth respectively, based on the above relationship between the composition mixing degree of the linking billet at each position and the composition value of the linking point, the composition limit value of the forehearth and the composition limit value of the backhearth, the composition mixing degrees corresponding to the starting point and the ending point of the linking billet can be determined respectively.

[0038] S04: obtaining the tapping amount corresponding to the starting point and the ending point according to the tundish residual steel amount when the backhearth ladle is opened, and the composition mixing degrees corresponding to the starting point and the ending point.

[0039] Wherein, the composition mixing degree at each position of the connecting bloom increases nonlinearly with the tapping amount at the corresponding position and linearly with the tundish remaining amount. In the embodiment of the present application, the composition mixing degree at each position of the connecting bloom is defined as increasing nonlinearly with the tapping amount at the corresponding position and linearly with the tundish remaining amount. After the composition mixing degree at each position of the connecting bloom and the tundish remaining amount are determined, the tapping amount at each position of the connecting bloom can be determined based on the above increasing relationship between the composition mixing degree at each position of the connecting bloom, the tapping amount at the corresponding position and the tundish remaining amount. Then, according to the composition mixing degree at the start point and the end point of the connecting bloom, the tapping amount at the start point and the end point of the connecting bloom can be calculated. The tapping amount at each position of the connecting bloom is also the tundish passing amount at each position of the connecting bloom.

[0040] S06: determining the start point and the end point of the connecting bloom according to the tapping amount at the start point and the end point, respectively.

[0041] The tapping amount at each position of the connecting bloom refers to the amount of molten steel required to expand the length of the casting bloom to the corresponding position of the connecting bloom. Therefore, after the position of the connecting bloom is determined, the tapping amount at each position of the connecting bloom can be calculated according to the casting length corresponding to each position of the connecting bloom, combined with the casting bloom size and the casting bloom speed at each position. Similarly, after the tapping amount at the start point and the end point of the connecting bloom is determined based on S04, the casting length corresponding to the start point and the end point of the connecting bloom can be determined based on the tapping amount, the casting bloom size and the casting bloom speed at each position, that is, the start point and the end point of the connecting bloom are determined, and then the length of the connecting bloom is determined according to the start point and the end point of the connecting bloom.

[0042] As can be seen from the above, the connecting bloom determination method provided in the embodiment of the present application takes the difference between the composition value of the connecting point corresponding to each position of the connecting bloom and the composition value of the forehearth as the first parameter at each position of the connecting bloom, and takes the difference between the composition value of the backhearth and the composition value of the forehearth as the second parameter, and defines the composition mixing degree at each position of the connecting bloom as being proportional to the first parameter and proportional to the second parameter, so that the composition mixing degree at the start point and the end point of the connecting bloom can be determined according to the composition limit value of the forehearth and the composition limit value of the backhearth, and the increasing relationship between the composition mixing degree and the tapping amount at the corresponding position and the tundish remaining amount is further defined, so that the tapping amount corresponding to the start point and the end point of the connecting bloom can be determined according to the composition mixing degree at the start point and the end point of the connecting bloom based on the increasing relationship, and finally the start point and the end point of the connecting bloom are determined according to the tapping amount corresponding to the start point and the end point of the connecting bloom. Therefore, the connecting bloom determination method provided in the embodiment of the present application can accurately demarcate the connecting bloom formed in the different steel continuous casting process, and is convenient for guiding the degradation and rejudgment processing of the connecting bloom.

[0043] In some embodiments, the SO2 specifically includes: using the component limit values ​​of the preceding furnace and the following furnace as the component values ​​at the connection point corresponding to the start and end points of the connecting billet, respectively, and substituting the connection point value, the component value of the preceding furnace, and the component value of the following furnace into the first component mixing degree calculation formula to calculate the component mixing degree corresponding to the start and end points, respectively. The first component mixing degree calculation formula characterizes the relationship between the component mixing degree and a first parameter, and a second parameter, respectively. Specifically, the first component mixing degree calculation formula may be, but is not limited to, M. i =S i / Q;M i S represents the degree of compositional mixing at position Pi of the connecting blank, with a value range of 0 ≤ Mi ≤ 1. i Let C be the first parameter defined above, and Q be the second parameter defined above. If we let the fore-furnace composition limit be Clim1, the rear-furnace composition limit be Clim2, and the fore-furnace composition value be C... 前 The composition value of the furnace is C. 后 If the component value of the joint point corresponding to the position Pi of the joint blank is Ci, then:

[0044] Si=Ci-C 前 Q=C 后 -C 前 .

[0045] Based on the above Figure 1 From the introduction and analysis of the connecting billet, it can be seen that the component value at the connecting point corresponding to the starting point of the connecting billet is the front furnace limit value Clim1, and the component value at the connecting point corresponding to the ending point of the connecting billet is the rear furnace limit value Clim2. Therefore, the front furnace limit value Clim1 and the front furnace component value Clim2 are... 前 and the composition value C of the furnace after furnace 后 Substituting into the formula for calculating the first component mixing degree, we obtain the component mixing degree corresponding to the starting and ending positions of the connecting blank. For clarity, the starting position of the connecting blank is defined as P. 起 The endpoint position of the connecting blank is defined as P. 终 The starting position P of the connecting blank 起 The degree of mixing of components at point M is defined as M 起 The end point P of the connecting blank 终 The degree of mixing of components at point M is defined as M 终 Among them, P 起 and P 终 Belongs to position P i The two positions in the text. Then:

[0046] M 起 =(Clim1- C 前 ) / (C 后 -C 前 ); M 终= (Clim2 - C 前 ) / (C 后 -C 前 ).

[0047] According to the first composition mixing degree calculation formula defined in the connection blank determination method provided in the embodiments of the present application, in the case that the forehearth composition value C 前 and the ladle composition value C 后 are known, the forehearth composition limit value Clim1 and the ladle composition limit value Clim2 are respectively substituted into the first composition mixing degree calculation formula, so that the corresponding composition mixing degree M 起 at the start position of the connection blank and the corresponding composition mixing degree M 终 at the end position of the connection blank can be respectively obtained. The composition mixing degree at each position of the connection blank is defined as changing with the change of the connection point value Ci at each position of the connection blank, the connection point composition value at each position of the connection point can be determined according to the composition mixing degree at each position of the connection point, and the connection blank can be conveniently degraded and rejudged according to the connection point composition value at each position of the connection point.

[0048] Further, the above SO4 specifically includes: substituting the tundish remaining steel amount and the composition mixing degrees corresponding to the start point and the end point into the second composition mixing degree calculation formula, to calculate the tapping amount corresponding to the start point and the end point. The second composition mixing degree calculation formula is: M i = A*ln(X i )+B; M i is the composition mixing degree corresponding to the position Pi of the connection blank, X i is the tapping amount corresponding to the position Pi of the connection blank, and A and B are formula coefficients linearly increasing with the tundish remaining steel amount R. In the embodiments, M i increases in logarithm with X i , and in other embodiments, M i may increase in other non-linear relationships with X i .

[0049] Further, in some embodiments, the relationship between the above formula coefficient A and the tundish remaining steel amount R and the relationship between the above formula coefficient B and the tundish remaining steel amount R are respectively defined as: A=m1*R+n1; B=m2*R+n2. Wherein, m1, n1, m2 and n2 are constant coefficients obtained by fitting according to the second composition mixing degree calculation formula based on the composition mixing degrees M i corresponding to different positions of the connection blank under a plurality of different tundish remaining steel amounts and the corresponding tapping amounts X i . The composition mixing degrees M i corresponding to different positions of the connection blank are based on the connection point composition values C i at the corresponding positions, the forehearth composition values C i and the ladle composition values C前 and the post-furnace component value C 后 The corresponding is substituted into the first component mixing degree calculation formula to calculate the multiple different positions P of the connecting blank i The corresponding tapping amount is calculated based on the casting length L of the corresponding position i , the casting blank size and the casting speed V. Among them, the casting blank size includes the width and length of the casting blank section.

[0050] As can be seen from the above, after determining the second component mixing degree calculation formula, the component mixing degree M 起 corresponding to the starting position of the connecting blank and the component mixing degree M 终 corresponding to the end position of the connecting blank are substituted into the second component mixing degree calculation formula, respectively, so that the tapping amount X 起 corresponding to the starting position of the connecting blank is obtained, and the tapping amount X 终 corresponding to the end position of the connecting blank is obtained.

[0051] Further, the above S06 specifically includes: according to the tapping amount X 起 corresponding to the starting position of the connecting blank, the casting blank size and the casting speed V, determining the casting length L 起 corresponding to the starting position of the connecting blank, according to the tapping amount X 终 corresponding to the end position of the connecting blank, the casting blank size and the casting speed V, determining the casting length L 终 corresponding to the end position of the connecting blank, according to the difference between the casting length L 终 corresponding to the end position of the connecting blank and the casting length L 起 corresponding to the starting position of the connecting blank, the length of the connecting blank can be accurately obtained. That is, the length of the connecting blank is: L 起 -L 终 .

[0052] For the previous furnace molten steel, the limit value of the target component, that is, the pre-furnace component limit value Clim1 is substituted into the first component mixing degree calculation formula, so that the component mixing degree M 前 satisfying the pre-furnace component limit value can be calculated, that is, the component mixing degree M 起 at the starting position of the connecting point is obtained, and then according to the second component mixing degree calculation formula, the amount of molten steel tapped from the ladle when the requirement of the previous furnace molten steel is met X 前 , that is, the tapping amount X 起 corresponding to the starting position of the connecting point is obtained, and then combined with the casting blank size and the casting speed V, the casting blank length L 起 corresponding to the starting position of the connecting point can be calculated. Similarly, for the next furnace molten steel, the limit value of the target component, that is, the post-furnace component limit value Clim2 is substituted into the first component mixing degree calculation formula, so that the component mixing degree M后 That is, the degree of compositional mixing M at the end position of the connecting blank is obtained. 终 Then, based on the formula for calculating the mixing degree of the second component, the amount of molten steel discharged from the ladle when the requirements for molten steel in the subsequent furnace are met can be calculated as X. 后 That is, the steel output X corresponding to the end position of the connection point. 终 By combining the dimensions of the cast billet and the casting speed V, the length L of the cast billet corresponding to the end position of the connection point can be calculated. 终 Based on the method for determining the connecting billet provided in this application, the pouring length of the billet is tracked starting from the ladle opening point. Then, based on the determined pouring lengths corresponding to the starting and ending points of the connecting billet, the connecting billet can be accurately identified for downgrading and reclassification. The method for determining the connecting billet provided in this application is simple, reliable, and easy to implement, and is suitable for widespread use.

[0053] In some embodiments, the method for determining the connecting blank provided in this application further includes: determining the corresponding position P of the connecting blank. i casting length L i Determine the steel output X at the corresponding position of the connecting billet. i ;P at the corresponding position of the connecting blank i Steel output X i Substituting into the formula for calculating the mixing degree of the second component, we obtain the corresponding position P of the connecting blank. i The degree of mixing of components M i ; Position P corresponding to the connecting blank i The degree of mixing of components M i Fore-furnace composition value C 前 And the composition value C of the furnace 后 Substituting into the formula for calculating the mixing degree of the first component, we obtain the position P corresponding to the connecting blank. i The connection point component value C i The method for determining the connecting blank provided in this application not only enables precise division of the connecting blank, but also accurately calculates the component values ​​of the connecting points at various locations of the connecting blank using the first component mixing degree calculation formula, thereby effectively guiding the accurate downgrading and reclassification of the connecting blank.

[0054] In some embodiments, before performing S04 above, the method for determining the connecting blank provided in this application further includes determining the formula for calculating the mixing degree of the second component, that is, determining constants m1, n1, m2, and n2. Specifically, the specific steps for determining the formula for calculating the mixing degree of the second component include the following steps.

[0055] First, after the ladle is opened for casting in the rear furnace, the casting length is tracked to obtain the casting length corresponding to multiple different positions of the connecting billet.

[0056] Then, based on the composition detection results of each position in multiple different locations, the composition values ​​of the connection points corresponding to each position in multiple different locations are obtained. The composition values ​​of the connection points, the composition values ​​of the front furnace, and the composition values ​​of the rear furnace corresponding to each position are substituted into the first composition mixing degree calculation formula to obtain the composition mixing degree corresponding to multiple different positions of the connection billet. The steel output corresponding to multiple different positions is calculated based on the casting length, casting billet size, and casting speed corresponding to multiple different positions.

[0057] Next, the composition mixing degree and steel output of the connecting billet at multiple different positions under the same tundish residual steel amount are fitted according to the second composition mixing degree calculation formula to determine A and B under the same tundish residual steel amount.

[0058] Finally, based on A and B determined under different tundish steel surplus amounts, m1, n1, m2 and n2 are determined according to the relationship: A=m1*R+n1; B=m2*R+n2.

[0059] The method for determining the connecting billet provided in this application embodiment, under the existing equipment and process layout, involves full-process sampling and compositional analysis of the connecting billets generated during the continuous casting of dissimilar steel grades with known furnace composition values, as well as M... i The fitting process includes: tracking the positions P of the connecting billet under a certain amount of remaining steel in the ladle. i The casting length L at the location i and for each position P i The component values ​​of the target component at each location are detected and analyzed to obtain P values ​​at each location. i The component value C at the junction point i Then, based on each position P i The component value C at the junction point i Fore-furnace composition value C 前 Post-furnace composition value C 后 Based on the first formula for calculating the degree of mixing of the first component, the component mixing degree M at different positions Pi of the connecting billet is calculated according to the component limit Clim1 of the front furnace and the component limit Clim2 of the rear furnace. i And according to the different positions of P of the connecting blank i Corresponding casting length L i P at different positions of the connecting blank was calculated respectively. i Corresponding steel output X i Next, based on the different positions P of the connecting blank... i The corresponding component mixing degree M i And steel output X i The degree of mixing of the components of the connecting blank, M i The numerical value is calculated according to the formula for the degree of mixing of the second component: M i =A*ln(X) iBy fitting the values ​​of )+B, we can obtain A and B under the given ladle steel allowance. We then perform composition analysis of the entire process connecting billet samples under two different ladle allowances R1 and R2, and analyze M... i The fitting process yields two distinct values ​​for A1, A2, and B1, B2. These values ​​satisfy A1 = m1*R1 + n1, A2 = m1*R2 + n1, B1 = m2*R1 + n2, and B2 = m2*R2 + n2. Based on these two distinct values ​​for A1, A2, B1, B2, R1, and R2, the constants m1, n1, m2, and n2 can be calculated. This allows us to obtain the formula M for calculating the degree of mixing of the second component. i =A*ln(X) i )+B.

[0060] To further clarify the process of determining the formula for calculating the mixing degree of the second component in the method for determining the connecting blank provided in the embodiments of this application, specific embodiments are described below.

[0061] If the continuous casting process for different steel grades produces 180mm×1850mm slabs, and the previous heat of steel was ship plate AH32 with a Nb content (target composition) of 0.0129% (previous heat composition value C...), then... 前 The next heat of steel was ship plate A, with a Nb content of 0.0007% (the subsequent heat composition value C). 后 The casting speed V is 1.2 m / min. Two heats (front and rear) are used for continuous casting of different steel grades. When the ladle in the rear heat is opened for casting, the remaining steel in the tundish is R1 = 24 t, and the casting length is 804 m. Starting from the casting length of 807 m, the position of the connecting billet is tracked every 1 m or 0.5 m. The position P of the connecting billet is... i like Figure 3 In the table shown, each connection point Pi in the P1 to P12 sections corresponds to a casting length L. i The tracking continued until the casting length reached 818.2m, with a total of 12 tracking points. For each connection point, position P... i The Nb content at each location was detected and analyzed to obtain the P content at each position of the connecting blank. i The corresponding connection point component value C i like Figure 3 The corresponding data in the table shows that each position P i The corresponding connection point component value C i Fore-furnace composition value C 前 Post-furnace composition value C 后 The calculations were performed using the first mixing degree calculation formula, and the results are as follows: Figure 3 The table shown is based on... Figure 3 The table shown represents the degree of mixing M for Nb content.i Data fitting was performed according to the formula for calculating the degree of mixing of the second component, yielding A1=0.49654 and B1=-0.91371. The fitted graph is shown below. Figure 4 As shown.

[0062] If the continuous casting process for different steel grades produces cast billets with a cross-sectional size of 260mm × 1870mm, and the previous heat of steel was ship plate A, with a Nb element content (target composition) of 0.0003% (previous heat composition value C)... 前 The next heat of steel was AH32 ship plate, with a Nb content of 0.0106% (the subsequent heat composition value C). 后 The casting speed V was 1.0 m / min. Two heats (front and rear) were used for continuous casting of different steel grades. When the ladle in the rear heat was opened for casting, the remaining steel in the tundish was R2 = 16t, and the casting length was 145.9m. Starting from the casting length of 147.98m, the position of the connecting billet was tracked approximately every 1m. The position P of the connecting billet was recorded. i like Figure 5 In the table shown, each connection point Pi in the P1 to P9 sections corresponds to a casting length L. i The tracking continued until the casting length reached 516m, with a total of 9 tracking points. For each connection point, position P... i The Nb content at each location was detected and analyzed to obtain the P content at each position of the connecting blank. i The corresponding connection point component value C i like Figure 5 The corresponding data in the table shows that each position P i The corresponding connection point component value C i Fore-furnace composition value C 前 Post-furnace composition value C 后 The calculations were performed using the first mixing degree calculation formula, and the results are as follows: Figure 5 The table shown is based on... Figure 5 The table shown represents the degree of mixing M for Nb content. i Data fitting was performed according to the formula for calculating the degree of mixing of the second component, yielding A2 = 0.49654 and B2 = -0.91371. The fitted graph is shown below. Figure 6 As shown.

[0063] Based on the data A1, A2 and B1, B2 obtained above, and according to the formulas A1=m1*R1+n1, A2=m1*R2+n1, B1=m2*R1+n2, B2=m2*R2+n2, we calculate m1=0.0023, n1=0.4416, m2=0.0023, n2=-0.8468. Therefore, A=0.0023*R+0.4416, B=0.0023*R-0.8468. Thus, the determined formula for calculating the degree of mixing of the second component is as follows:

[0064] M i = (0.0023 * R + 0.4416) * ln(X i ) + (0.0023 * R - 0.8468).

[0065] According to the determined second composition mixing degree calculation formula, after knowing the tundish remaining steel quantity R at the time of tapping of the ladle in the second furnace and the tapped molten steel quantity Xi, the composition mixing degree Mi corresponding to the position can be calculated, and then according to the composition mixing degree Mi of each position and the first composition mixing degree calculation formula, the composition value Ci of the linking point at each position of the linking billet can be calculated. Conversely, the composition mixing degree corresponding to the start point and the end point position of the linking billet determined according to the composition limit value of the first furnace and the composition limit value of the second furnace is substituted into the second composition mixing degree calculation formula, so that the tapping quantity corresponding to the start point and the end point of the linking billet can be obtained, and then the length of the linking billet can be obtained. Obviously, the linking billet calculation method provided by the embodiment of the application can not only accurately determine the length of the linking billet, but also determine the composition value of the linking point at each position of the linking billet, so as to guide the degradation and judgment processing of the linking billet.

[0066] Further, the first calculation module 101 is specifically configured to determine the composition mixing degree corresponding to the start point and the end point of the linking billet according to the corresponding method steps in the linking billet determination method provided by any of the above embodiments, the second calculation module is specifically configured to determine the tapping quantity corresponding to the start point and the end point of the linking billet according to the corresponding method steps in the linking billet determination method provided by any of the above embodiments, and the determination module is specifically configured to determine the position corresponding to the start point and the end point of the linking billet according to the corresponding method steps in the linking billet determination method provided by any of the above embodiments, so as to determine the linking billet. In addition, the determination module is specifically configured to determine the composition value of the linking point at each position of the linking billet according to the corresponding method steps in the linking billet determination method provided by any of the above embodiments.

[0067] Please refer to Figure 7As shown in the figure, it is a structural schematic diagram of the interface billet determination device provided by some embodiments of the present application. In some embodiments, the interface billet determination device provided by the present application comprises a first calculation module 101, a second calculation module 102 and a determination module 103. The first calculation module 101 is configured to take the composition limit value of the forehearth and the composition limit value of the backhearth as the composition value of the interface point corresponding to the start point and the end point of the interface billet respectively, and determine the composition mixing degree corresponding to the start point and the end point according to the composition value of the interface point, the composition value of the forehearth and the composition value of the backhearth. 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 composition value of the interface point and the composition value of the forehearth, and the second parameter is the difference between the composition value of the backhearth and the composition value of the forehearth. The second calculation module 102 is configured to obtain the tapping amount corresponding to the start point and the end point according to the tundish residual steel amount when the backhearth ladle is opened and the composition mixing degree corresponding to the start point and the end point. The composition mixing degree increases nonlinearly with the tapping amount at the corresponding position and linearly with the tundish residual steel amount. The determination module 103 is configured to determine the start point and the end point of the interface billet according to the tapping amount corresponding to the start point and the end point respectively. The interface billet determination device provided by the embodiments of the present application can achieve the same technical effects as the interface billet determination method provided by the embodiments of the present application. Here, the same technical effects will not be described again.

[0068] Please refer to Figure 8 As shown in the figure, it is a structural schematic diagram of the interface billet determination device provided by some embodiments of the present application. In some embodiments, the interface billet determination device provided by the present application comprises a memory 201 and a processor 202, and the memory 201 stores a computer program executable by the processor. The computer program is executed by the processor 202 to implement the interface billet determination method provided by any of the embodiments of the present application and can achieve the same technical effects. To avoid repetition, here will not be described again.

[0069] The embodiments of the present application also provide a computer readable storage medium, and the computer readable storage medium stores a computer program. The computer program is executed by the processor to implement each process of the above interface billet determination method embodiments and can achieve the same technical effects. To avoid repetition, here will not be described again. The computer readable storage medium includes, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0070] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of determining a joining slab formed by continuous casting of different steel grades, characterized by, The method comprises the following steps: The composition mixing degree corresponding to the start point and the end point of the linking blank is determined according to the linking point composition value, the forehearth composition limit value and the backhearth composition limit value, wherein the forehearth composition limit value and the backhearth composition limit value are respectively taken as the linking point composition value corresponding to the start point and the end point of the linking blank; the composition mixing degree is proportional to the first parameter at the corresponding position and inversely proportional to the second parameter, wherein the first parameter is the difference between the linking point composition value and the forehearth composition limit value, and the second parameter is the difference between the backhearth composition limit value and the forehearth composition limit value; The tapping quantity corresponding to the start point and the end point of the linking blank is obtained according to the tundish residual steel quantity when the backhearth ladle is opened and the composition mixing degree corresponding to the start point and the end point of the linking blank; The composition mixing degree non-linearly increases with the tapping quantity at the corresponding position and linearly increases with the tundish residual steel quantity; The start point and the end point of the linking blank are determined according to the tapping quantity corresponding to the start point and the end point of the linking blank respectively; The composition mixing degree corresponding to the start point and the end point of the linking blank is determined according to the linking point composition value, the forehearth composition limit value and the backhearth composition limit value, wherein the forehearth composition limit value and the backhearth composition limit value are respectively taken as the linking point composition value corresponding to the start point and the end point of the linking blank, and the method comprises the following steps: The composition mixing degree corresponding to the start point and the end point of the linking blank is respectively obtained by taking the forehearth composition limit value and the backhearth composition limit value as the linking point composition value corresponding to the start point and the end point of the linking blank respectively and substituting the linking point value, the forehearth composition limit value and the backhearth composition limit value into the first composition mixing degree calculation formula; The formula for calculating the degree of mixing of the first component is: M i =S i / Q; the M i The position P of the connecting blank i The corresponding component mixing degree, the S i The first parameter is denoted as , and Q is denoted as .

2. The splicing blank determining method according to claim 1, characterized by, The tapping quantity corresponding to the start point and the end point of the linking blank is obtained according to the tundish residual steel quantity when the backhearth ladle is opened and the composition mixing degree corresponding to the start point and the end point, and the method comprises the following steps: The tapping quantity corresponding to the start point and the end point of the linking blank is obtained by substituting the tundish residual steel quantity and the composition mixing degree corresponding to the start point and the end point into the second composition mixing degree calculation formula; The second component mixing degree calculation formula is M i = A*ln(X i )+B; X i is the tapping amount corresponding to the position P i of the link blank, and A and B are formula coefficients that linearly increase with the tundish residual amount.

3. The splicing blank determining method according to claim 2, characterized by, The A and the B satisfy the relationship: A = m1*R + n1; B = m2*R + n2; The R is the tundish residual steel quantity, and the m1, the n1, the m2 and the n2 are constant coefficients obtained by fitting the composition mixing degree and the corresponding tapping quantity at different positions of the linking blank under different tundish residual steel quantities according to the second composition mixing degree calculation formula; The composition mixing degree corresponding to the different positions of the linking blank is obtained by substituting the linking point composition value, the forehearth composition limit value and the backhearth composition limit value at the corresponding position into the first composition mixing degree calculation formula, and the tapping quantity corresponding to the different positions of the linking blank is obtained according to the casting length, the casting blank size and the casting speed at the corresponding position.

4. The splicing blank determining method according to claim 3, wherein Before the tundish residual steel quantity and the composition mixing degree corresponding to the start point and the end point of the linking blank are substituted into the second composition mixing degree calculation formula, the method further comprises the following steps: After the backhearth ladle is opened, the casting length tracking is performed to obtain the casting length corresponding to the different positions of the linking blank. According to the composition detection result of each position in the plurality of different positions, the composition mixing degree corresponding to each position in the plurality of different positions of the butt joint blank is obtained, and the composition mixing degree corresponding to each position, the forehearth composition value and the backhearth composition value are substituted into the first composition mixing degree calculation formula, so that the composition mixing degree corresponding to the plurality of different positions of the butt joint blank is obtained, and the casting length, the casting blank size and the casting speed corresponding to the plurality of different positions are calculated, so that the tapping quantity corresponding to the plurality of different positions is obtained; The composition mixing degree and the tapping quantity corresponding to the plurality of different positions of the butt joint blank under the same tundish residual steel quantity are fitted according to the second composition mixing degree calculation formula, so that the A and the B under the same tundish residual steel quantity are determined; According to the A and the B determined under different tundish residual steel quantities, the relationship A=m1*R+n1; B=m2*R+n2 is calculated, so that the m1, the n1, the m2 and the n2 are respectively determined.

5. The splicing blank determining method according to any one of claims 1 to 4, characterized by, The start point and the end point of the butt joint blank are respectively determined according to the tapping quantity corresponding to the start point and the end point, and the method comprises the steps that: The casting length corresponding to the start point is determined according to the tapping quantity, the casting blank size and the casting speed corresponding to the start point, and the casting length corresponding to the end point is determined according to the tapping quantity, the casting blank size and the casting speed corresponding to the end point; The length of the casting blank is determined according to the difference between the casting length corresponding to the end point and the casting length corresponding to the start point.

6. The splicing blank determining method according to claim 2, wherein Further comprising: The tapping quantity corresponding to the position of the butt joint blank is determined according to the casting length of the position of the butt joint blank; The tapping quantity corresponding to the position of the butt joint blank is substituted into the second composition mixing degree calculation formula, so that the composition mixing degree of the position of the butt joint blank is obtained; The composition mixing degree, the forehearth composition value and the backhearth composition value of the position of the butt joint blank are substituted into the first composition mixing degree calculation formula, so that the butt joint composition value of the position of the butt joint blank is obtained.

7. An apparatus for determining a strand connecting blank formed by continuous casting of different steel grades, as claimed in any one of claims 1 to 6, characterized in that The method comprises a first calculation module, a second calculation module and a determination module. The first calculation module is used for taking the forehearth composition limit value and the backhearth composition limit value as the butt joint composition values corresponding to the start point and the end point of the butt joint blank respectively, determining the composition mixing degree corresponding to the start point and the end point according to the butt joint composition value, the forehearth composition value and the backhearth composition value; the composition mixing degree is proportional to a first parameter at the corresponding position and is inversely proportional to a second parameter, the first parameter is the difference between the butt joint composition value and the forehearth composition value, and the second parameter is the difference between the backhearth composition value and the forehearth composition value; The second calculation module is used for obtaining the tapping quantity corresponding to the start point and the end point according to the tundish residual steel quantity when the backhearth ladle is opened and the composition mixing degree corresponding to the start point and the end point; the composition mixing degree nonlinearly increases with the tapping quantity at the corresponding position and linearly increases with the tundish residual steel quantity; The determination module is used for determining the start point and the end point of the butt joint blank according to the tapping quantity corresponding to the start point and the end point respectively.

8. A splice blank determination apparatus characterized by, comprising a memory and a processor; The memory stores a computer readable program, and the processor, when executing the computer readable program, implements the adapter blank determination method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program, when executed by a processor, implements the adapter blank determination method according to any one of claims 1 to 6.

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