Production method of galvanized strip steel

Abstract

The invention discloses a production method of galvanized strip steel, and relates to the technical field of galvanized strip steel. Obtaining an annealing temperature, and obtaining an annealing temperature control set by using an annealing temperature control method; the annealed strip steel is galvanized; obtaining the optimal current density by using an electrolytic current analysis method; the strip steel is treated based on the post-treatment stage; the method is used for solving the problems that in an existing galvanized strip steel production method, improvement on current density control during electrolysis based on heat treatment parameters is lacked in the electrolysis control aspect of cold galvanized strip steel, and consequently the adhesive force and durability of a surface zinc layer are poor; and the cold-galvanized steel strip does not have corrosion resistance and service life in a complex use environment, so that the use efficiency of the cold-galvanized steel strip is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of galvanized steel strips, in particular to a production method of galvanized steel strips. Background Art

[0002] Galvanized steel strip refers to steel strip with a layer of zinc on the surface, and its substrate can be hot-rolled steel strip or cold-rolled steel strip; the main purpose of galvanized steel strip is corrosion resistance and aesthetics, and prolongs service life; the production process of galvanized steel strip mainly includes pretreatment stage, galvanizing stage and post-treatment stage, among which the pretreatment stage includes uncoiling and welding, pickling and degreasing cleaning and annealing, the galvanizing stage includes galvanizing using galvanizing method and controlling the zinc layer with air knife, and the post-treatment stage includes alloying treatment, flattening and straightening, surface passivation and oiling, as well as trimming and winding.

[0003] The existing methods for producing galvanized steel strips usually involve improvements in the temperature control of the zinc pot and the cutting control of the air knife during the production of hot-dip galvanized steel strips; in the production process of cold-dip galvanized steel strips, the components in the steel strip matrix are usually controlled to improve the quality of the galvanized steel strips, and in the electrolysis control of the cold-dip galvanized steel strips, there is a lack of improvements in the control of the current density during electrolysis based on heat treatment parameters. This will result in the cold-dip galvanized steel strips not having corrosion resistance and service life in complex use environments due to poor adhesion and durability of the surface zinc layer when manufacturing complex parts, thereby reducing the use efficiency of the cold-dip galvanized steel strips. For example, in a patent application with publication number CN110318013A, a method for producing hot-dip galvanized steel strips is disclosed. The scheme controls the annealing temperature range of the hot-dip galvanized steel strips, controls the start temperature, and controls the end temperature of the hot-dip galvanized steel strips. The opening time of the electric heating in the outlet section of the annealing furnace is used to reduce the temperature difference between the hot-dip galvanized strip after it leaves the annealing furnace and before it enters the zinc pot; the zinc pot tension value and the insertion amount of the correction roller of the hot-dip galvanized strip in the hot-dip galvanizing process section are controlled; and the coating method and coating roller parameters of the roller coater are adjusted. Other improvements in the production methods of galvanized strip are usually improvements in improving the surface defects of galvanized steel strips, but still cannot solve the problem of electrolysis control of cold-dip galvanized strips. There is a lack of improvements in the control of current density during electrolysis based on heat treatment parameters. This will result in the cold-dip galvanized steel strip having poor adhesion and durability in complex use environments when manufacturing complex parts, resulting in the cold-dip galvanized steel strip having no corrosion resistance and service life, thereby reducing the use efficiency of the cold-dip galvanized steel strip. In view of this, it is necessary to improve the existing production methods of galvanized strips. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the prior art to at least a certain extent, by proposing a method for producing galvanized steel strip, which is used to solve the problem that in the existing method for producing galvanized steel strip, in terms of electrolysis control of cold-dip galvanized steel strip, there is a lack of improvement in the control of current density during electrolysis based on heat treatment parameters, which results in the cold-dip galvanized steel strip having poor adhesion and durability of the surface zinc layer when manufacturing complex parts, resulting in the cold-dip galvanized steel strip having no corrosion resistance and service life in complex use environments, thereby reducing the use efficiency of the cold-dip galvanized steel strip.

[0005] To achieve the above object, the present application provides a method for producing galvanized steel strip, comprising the following steps: The steel coil is unrolled and the strip steel is continuously obtained, and the tail and head of the front and rear strip steels are welded; the strip steel is pretreated based on pickling and degreasing cleaning; and the pretreated strip steel is recorded as the strip steel to be annealed; Acquire an annealable temperature based on a heating temperature that can be provided by the annealing equipment, analyze the annealing treatment of the annealed strip using an annealing temperature control method, and acquire an annealing temperature control set based on the analysis result, wherein the annealing temperature control set includes a plurality of annealable temperatures; Based on the annealing temperature control set, the steel strip to be annealed is annealed, and the annealed steel strip is placed in a solution containing zinc salt, and the surface of the steel strip is galvanized based on an electrolytic device; based on the annealing temperature control set, the electrolytic current analysis method is used to obtain the optimal current density corresponding to different annealing temperatures; The galvanized steel strip is heated until a zinc-iron alloy layer is formed, and the strip containing the zinc-iron alloy layer is flattened, straightened, surface passivated, oiled, trimmed and coiled based on the post-processing stage of the galvanized steel strip production process.

[0006] Further, the annealing temperature control method includes: Based on the thickness of the strip to be annealed and the process requirements, the heating temperature, holding time and temperature of the strip after cooling are obtained during annealing, and are recorded as annealing temperature, annealing holding time and annealing cooling temperature respectively; the heating temperatures that can be provided by the annealing equipment during annealing and are greater than the annealing temperature are recorded from small to large as annealable temperature KT1 to annealable temperature KT c ; For any annealing temperature KT b , using annealing temperature KT b The annealing strip is heated until the temperature of the annealing strip reaches the annealing temperature, the heating of the annealing strip is stopped, and the annealing strip is kept warm. When the warm-keeping time reaches the annealing warm-keeping time, the annealing strip is cooled with the furnace until the temperature of the annealing strip reaches the annealing cooling temperature, wherein b is a positive integer less than or equal to c and greater than or equal to 1; Get the annealing temperature KT b The temperature data of the steel strip to be annealed during the process of starting to heat the steel strip to the temperature of the steel strip to be annealed is the annealing cooling temperature, and is recorded as annealing temperature data.

[0007] Furthermore, the annealing temperature control method also includes: A plane rectangular coordinate system is established and recorded as the annealing analysis coordinate system, where the unit of the X-axis of the annealing analysis coordinate system is time and the unit of the Y-axis is temperature; based on the annealing temperature KT b The corresponding curve is drawn in the quadrant of the annealing analysis coordinate system, and is recorded as the annealing analysis curve, where the leftmost point of the annealing analysis curve is (0, y1), the rightmost point is (x1, y2), and y1 is the annealing temperature KT of the strip to be annealed. b The temperature before heating, x1 is the annealing temperature KT of the strip to be annealed b The sum of the heating time, the holding time and the furnace cooling time, y2 is the annealing cooling temperature.

[0008] Furthermore, the annealing temperature control method also includes: The area where the slope of the annealing analysis curve is greater than 0 is recorded as the temperature increase area, and the area where the slope of the annealing analysis curve is less than 0 is recorded as the temperature decrease area; the annealing analysis algorithm is used to obtain the annealing analysis parameters corresponding to the annealing analysis curve; the annealing analysis algorithm is: , where F is the annealing analysis parameter, t1 is the length of the heating area in the X-axis, t2 is the length of the cooling area in the X-axis, and k max is the maximum value of the slope in the temperature rising area, h max is the maximum value of the slope in the cooling area, k min is the minimum value of the slope in the temperature rising region, h min is the minimum slope in the cooling area, k sq is the average value of the slope of all points in the heating region, h sq is the average of the slopes of all points in the cooling region.

[0009] Furthermore, the annealing temperature control method also includes: The annealing analysis curves and annealing analysis parameters corresponding to all annealable temperatures KT are obtained; the average value of all annealing analysis parameters is recorded as the annealing measurement parameter, and the set of annealable temperatures KT whose annealing analysis parameters are less than the annealing measurement parameter is recorded as the annealing temperature control set.

[0010] Further, annealing the steel strip to be annealed based on the annealing temperature control set, placing the annealed steel strip into a solution containing zinc salt, and galvanizing the surface of the steel strip based on the electrolytic equipment includes: For any annealable temperature KT in the annealing temperature control set, the steel strip to be annealed is placed in the annealing equipment based on the annealable temperature KT and annealed, and the steel strip to be annealed after the annealing is recorded as the steel strip to be plated; the current density that the electrolysis equipment can provide during electrolysis is recorded as the electrolysis density KM1 to the electrolysis density KM n ; Based on the process requirements of the strip, the thickness of the zinc layer on the surface of the strip is obtained and recorded as the standard thickness.

[0011] Further, annealing the steel strip to be annealed based on the annealing temperature control set, placing the annealed steel strip into a solution containing zinc salt, and galvanizing the surface of the steel strip based on the electrolytic equipment also includes: Galvanizing treatment includes: for any electrolytic density KM m , put the steel strip to be plated into a solution containing zinc salt, and based on the electrolytic density KM m The electrolytic device is used to electrolyze the solution in which the steel strip to be plated is located, and the thickness of the zinc layer on the surface of the steel strip to be plated is obtained in real time. When the thickness of the zinc layer reaches the standard thickness, the electrolytic device is turned off, wherein m is a positive integer less than or equal to n and greater than or equal to 1.

[0012] Further, the electrolytic current method comprises: Use electrolytic density KM1 to electrolytic density KM in sequence n The n steel strips to be plated are subjected to galvanizing treatment, and the data corresponding to the thickness of the zinc layer on the surface of the steel strips to be plated during the galvanizing treatment are recorded as galvanizing thickness data DH1 to galvanizing thickness data DH n ; A plane rectangular coordinate system is established and recorded as the galvanizing analysis coordinate system, where the unit of the X-axis of the galvanizing analysis coordinate system is time and the unit of the Y-axis is mm; for any galvanizing thickness data DH m , a curve is drawn in the galvanizing analysis coordinate system based on the average thickness of the zinc layer on the surface of the steel strip to be plated after the electrolytic equipment is started, and it is recorded as the average zinc layer curve; a curve is drawn in the galvanizing analysis coordinate system based on the maximum thickness of the zinc layer on the surface of the steel strip to be plated after the electrolytic equipment is started, and it is recorded as the maximum zinc layer curve; the points in the average zinc layer curve and the maximum zinc layer curve whose ordinate is the standard thickness and whose abscissa is the smallest are recorded as the average point and the maximum point, respectively.

[0013] Further, the electrolytic current method also includes: Use zinc layer analysis algorithm to obtain galvanized thickness data DH m The corresponding galvanizing analysis parameters and zinc layer analysis algorithm are: R=A1×A2×A3, where A1 is the abscissa of the average point, A2 is the abscissa of the maximum point, and A3 is the absolute value of the difference between the abscissa of the average point and the abscissa of the maximum point; Get all galvanizing thickness data DH mThe galvanizing analysis parameters are calculated, and the electrolytic density KM corresponding to the minimum galvanizing analysis parameter is recorded as the optimal current density for the annealing temperature KT; The optimal current density of all annealable temperatures KT is obtained, and the temperature-density complementary algorithm is used to obtain the temperature-density parameters of each annealable temperature KT. The temperature-density complementary algorithm is: , where G is the temperature density parameter, R is the galvanizing analysis parameter corresponding to the optimal current density of the annealing temperature KT, and F is the annealing analysis parameter corresponding to the annealing temperature KT; The annealing temperature KT corresponding to the minimum value of all temperature and density parameters is recorded as the optimal annealing temperature, and the optimal annealing temperature and the optimal current density of the optimal annealing temperature are used to perform annealing and galvanizing treatment on the steel strip to be annealed.

[0014] Further, heating the galvanized steel strip until a zinc-iron alloy layer is formed comprises: For any galvanized steel strip: the thickness of the zinc-iron alloy layer is obtained based on the process requirements and recorded as the zinc-iron thickness; the steel strip is heated until the zinc-iron alloy layer is generated and the thickness of the zinc-iron alloy layer is the zinc-iron thickness.

[0015] Beneficial effects of the present invention: the present invention first obtains a steel strip; pre-treats the steel strip based on pickling and degreasing cleaning; records the pre-treated steel strip as a steel strip to be annealed; then obtains an annealable temperature based on the heating temperature that the annealing equipment can provide, uses an annealing temperature control method to analyze the annealing treatment of the steel strip to be annealed, and obtains an annealing temperature control set based on the analysis result. The advantage of this is that by obtaining the annealable temperature and the annealing temperature control set, the heat treatment process of the steel strip before galvanizing can be analyzed, thereby obtaining an annealable temperature that can stably heat the steel strip, and storing it in the annealing temperature control set to provide data for subsequent galvanizing analysis, ensuring that the current density of the electrolysis process during galvanizing can be analyzed in accordance with the heat treatment parameters, so as to improve the adhesion and durability of the zinc layer surface after annealing and galvanizing through the analyzed data, thereby improving the use efficiency of the galvanized steel strip; The present application performs annealing treatment on the annealing strip based on the annealing temperature control set, and galvanizes the surface of the strip based on the electrolytic equipment; uses the electrolytic current analysis method based on the annealing temperature control set to obtain the optimal current density corresponding to different annealing temperatures; finally, the galvanized steel strip is heated until a zinc-iron alloy layer is generated, and the strip containing the zinc-iron alloy layer is processed based on the post-processing stage of the production process of the galvanized strip. The advantage of this is that by obtaining the optimal current density based on the annealing temperature control set, the optimal current density during galvanizing corresponding to different annealing temperatures can be obtained, so that the final optimal annealing temperature and optimal current density are data that meet the material and process requirements of the strip itself, thereby making the galvanized strip have better corrosion resistance and service life in a complex use environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of the steps of the method of the present invention; Figure 2 is a schematic diagram of the annealing analysis coordinate system of the present invention; Figure 3 It is a schematic diagram of the galvanizing analysis coordinate system of the present invention; Figure 4 It is a schematic structural diagram of the electronic device of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1, please refer to Figure 1 As shown, the present application provides a method for producing galvanized steel strip, comprising the following steps: Step S1, unwinding the steel coil and continuously obtaining the strip steel, welding the tail and head of the front and rear strip steels; pre-treating the strip steel by pickling and degreasing; recording the pre-treated strip steel as the strip steel to be annealed; Acquire an annealable temperature based on a heating temperature that can be provided by the annealing equipment, analyze the annealing treatment of the annealed strip using an annealing temperature control method, and acquire an annealing temperature control set based on the analysis result, wherein the annealing temperature control set includes a plurality of annealable temperatures; The annealing temperature control method comprises: step S101, based on the thickness of the strip to be annealed and the process requirements, the heating temperature, the holding time and the temperature of the strip after cooling are obtained during annealing, and are recorded as the annealing temperature, the annealing holding time and the annealing cooling temperature respectively; the heating temperatures that can be provided by the annealing equipment during annealing and are greater than the annealing temperature are recorded in order from small to large as annealable temperatures KT1 to annealable temperatures KT c ; In the specific implementation process, for example, during a data analysis, it is obtained that the heating temperature that the annealing equipment can provide is 1200°C, and the annealing temperature is 800°C. Then, through analysis, it can be obtained that 1200°C can be recorded as the annealing temperature KT; in order to ensure that the strip can be heated normally, the annealing temperature KT obtained should be greater than the annealing temperature; Step S102: for any annealing temperature KT b , using annealing temperature KT bThe annealing strip is heated until the temperature of the annealing strip reaches the annealing temperature, the heating of the annealing strip is stopped, and the annealing strip is kept warm. When the warm-keeping time reaches the annealing warm-keeping time, the annealing strip is cooled with the furnace until the temperature of the annealing strip reaches the annealing cooling temperature, wherein b is a positive integer less than or equal to c and greater than or equal to 1; In the specific implementation process, step S102 can be adjusted according to the actual annealing process flow to ensure that the data is consistent with the actual operation process; Step S103, obtaining the annealing temperature KT b The temperature data of the steel strip to be annealed during the process of starting to heat the steel strip to the temperature of the steel strip to be annealed is the annealing cooling temperature, and is recorded as the annealing temperature data; Step S104, establish a plane rectangular coordinate system and record it as the annealing analysis coordinate system, wherein the unit of the X-axis of the annealing analysis coordinate system is time / min, and the unit of the Y-axis is temperature / °C; based on the annealing temperature KT b The corresponding curve is drawn in the quadrant of the annealing analysis coordinate system, and is recorded as the annealing analysis curve, where the leftmost point of the annealing analysis curve is (0, y1), the rightmost point is (x1, y2), and y1 is the annealing temperature KT of the strip to be annealed. b The temperature before heating, x1 is the annealing temperature KT of the strip to be annealed b The sum of the heating time, the holding time and the cooling time with the furnace, y2 is the annealing cooling temperature; In the specific implementation process, for example, during a data analysis, the annealing analysis coordinate system is obtained as follows: Figure 2 As shown, the curve between X=0 and X=PP3 is the annealing analysis curve, the area between X=0 and X=PP1 is the heating area, and the area between X=PP2 and X=PP3 is the cooling area; at the same time, the coordinates of point PP3 are (x1, y2), and the coordinates of point PP1 are (0, y1); Step S105, record the area in the annealing analysis curve where the slope is greater than 0 as the heating area, and record the area in the annealing analysis curve where the slope is less than 0 as the cooling area; use the annealing analysis algorithm to obtain the annealing analysis parameters corresponding to the annealing analysis curve; the annealing analysis algorithm is: , where F is the annealing analysis parameter, t1 is the length of the heating area in the X-axis, t2 is the length of the cooling area in the X-axis, and k max is the maximum value of the slope in the temperature rising area, h max is the maximum value of the slope in the cooling area, k min is the minimum value of the slope in the temperature rising region, h min is the minimum slope in the cooling area, k sqis the average value of the slope of all points in the heating region, h sq is the average value of the slopes of all points in the cooling region; In the specific implementation process, for example, in a data analysis, the k max , k min and k sq 2, 1 and 1.5 respectively, h max 、h min and h sq are -1, -2 and -1.5 respectively, t1 and t2 are 60min and 120min respectively, then it can be obtained by calculation that the annealing analysis parameter is 180. In this embodiment, the annealing analysis parameter can reflect the relationship between the stability of the heating process and the cooling process during the annealing process and the annealing time. The larger the annealing analysis parameter, the more unstable the heating and cooling process or the longer the annealing time. The larger the annealing analysis parameter, the more stable the heating and cooling process or the shorter the annealing time. Therefore, selecting an annealing temperature with a smaller annealing analysis parameter can ensure that the annealing process is more stable and more efficient in the actual annealing process. Step S106, obtaining annealing analysis curves and annealing analysis parameters corresponding to all annealable temperatures KT; recording the average value of all annealing analysis parameters as the annealing measurement parameter, and recording the set of annealable temperatures KT whose annealing analysis parameters are less than the annealing measurement parameter as the annealing temperature control set.

[0019] Step S2, annealing the steel strip to be annealed based on the annealing temperature control set, placing the annealed steel strip into a solution containing zinc salt, and galvanizing the surface of the steel strip based on an electrolytic device; using an electrolytic current analysis method based on the annealing temperature control set to obtain the optimal current density corresponding to different annealing temperatures; Step S2 includes: step S201, for any annealable temperature KT in the annealing temperature control set, placing the steel strip to be annealed into the annealing equipment based on the annealable temperature KT and performing annealing treatment, recording the steel strip to be annealed after the annealing treatment as the steel strip to be plated; recording the current density that the electrolysis equipment can provide during electrolysis as the electrolysis density KM1 to the electrolysis density KM n ; Based on the process requirements of the strip steel, the thickness of the zinc layer on the surface of the strip steel is obtained and recorded as the standard thickness; In the specific implementation process, the current density in this embodiment is the amount of electricity passing through a unit area per unit time. The current density can be obtained based on the electrolysis equipment and the area in the zinc salt solution where the current density can be collected; Step S202, the galvanizing treatment includes: for any electrolytic density KM m , put the steel strip to be plated into a solution containing zinc salt, and based on the electrolytic density KM mUsing an electrolytic device to electrolyze the solution in which the steel strip to be plated is located, obtaining the thickness of the zinc layer on the surface of the steel strip to be plated in real time, and turning off the electrolytic device when the thickness of the zinc layer reaches the standard thickness, wherein m is a positive integer less than or equal to n and greater than or equal to 1; In specific implementation, the galvanizing treatment can be modified according to the actual galvanizing process to ensure that the galvanizing treatment is consistent with the actual situation and improve the validity of the data; Step S203, the electrolytic current method includes: step S2031, using the electrolytic density KM1 to the electrolytic density KM n The n steel strips to be plated are subjected to galvanizing treatment, and the data corresponding to the thickness of the zinc layer on the surface of the steel strips to be plated during the galvanizing treatment are recorded as galvanizing thickness data DH1 to galvanizing thickness data DH n ; Step S2032, establish a plane rectangular coordinate system and record it as the galvanizing analysis coordinate system, where the unit of the X-axis of the galvanizing analysis coordinate system is time / min, and the unit of the Y-axis is thickness / mm; for any galvanizing thickness data DH m , based on the average thickness of the zinc layer on the surface of the steel strip to be plated after the electrolytic equipment is started, a curve is drawn in the galvanizing analysis coordinate system, and recorded as the average zinc layer curve; based on the maximum thickness of the zinc layer on the surface of the steel strip to be plated after the electrolytic equipment is started, a curve is drawn in the galvanizing analysis coordinate system, and recorded as the maximum zinc layer curve; the points in the average zinc layer curve and the maximum zinc layer curve whose ordinate is the standard thickness and whose abscissa is the smallest are recorded as the average point and the maximum point respectively; In the specific implementation process, for example, during a data processing, the galvanizing analysis coordinate system is obtained as follows Figure 3 As shown, DD1 is the maximum point and DD2 is the average point. Then, through analysis, it can be obtained that XX1 is A2, XX2 is A1, and the difference between XX2 and XX1 is A3; Step S2033, using the zinc layer analysis algorithm to obtain the galvanized thickness data DH m The corresponding galvanizing analysis parameters and zinc layer analysis algorithm are: R=A1×A2×A3, where A1 is the abscissa of the average point, A2 is the abscissa of the maximum point, and A3 is the absolute value of the difference between the abscissa of the average point and the abscissa of the maximum point; Step S2034, obtain all galvanizing thickness data DH m The galvanizing analysis parameters are calculated, and the electrolytic density KM corresponding to the minimum galvanizing analysis parameter is recorded as the optimal current density for the annealing temperature KT; Step S204, obtaining the optimal current density of all annealable temperatures KT, and using a temperature-density complementary algorithm to obtain the temperature-density parameter of each annealable temperature KT, the temperature-density complementary algorithm is: , where G is the temperature density parameter, R is the galvanizing analysis parameter corresponding to the optimal current density of the annealing temperature KT, and F is the annealing analysis parameter corresponding to the annealing temperature KT; In the specific implementation process, for example, in a data processing, the obtained A1, A2 and A3 are 40min, 50min and 10min respectively, and the annealing analysis parameter is 180, then it can be obtained by calculation that the galvanizing analysis parameter is 20000, and the temperature density parameter is about 356.8; in this embodiment, the galvanizing analysis parameter reflects the time relationship between the maximum thickness and the average thickness when the zinc layer is generated; the smaller the galvanizing analysis parameter is, the more uniform the generation of the zinc layer and the shorter the time is during the galvanizing process. Therefore, through the judgment criteria of the annealing analysis parameter and the galvanizing analysis parameter, it can be obtained that the temperature density parameter obtained by the temperature density complementary algorithm is smaller, and the annealing temperature KT and its corresponding optimal current density can improve the efficiency of galvanizing and the quality of the zinc layer during the galvanizing process, thereby achieving the control of the current density during electrolysis based on the heat treatment parameters, improving the adhesion and durability of the zinc layer, and ensuring that the zinc layer has better corrosion resistance and service life in a complex use environment; Step S205, the annealable temperature KT corresponding to the minimum value of all temperature and density parameters is recorded as the optimal annealing temperature, and the optimal annealing temperature and the optimal current density of the optimal annealing temperature are used to perform annealing and galvanizing treatment on the steel strip to be annealed.

[0020] Step S3, for any galvanized steel strip: based on the process requirements, the thickness of the zinc-iron alloy layer is obtained and recorded as the zinc-iron thickness; the steel strip is heated until the zinc-iron alloy layer is generated and the thickness of the zinc-iron alloy layer is the zinc-iron thickness; In the post-processing stage of the galvanized strip production process, the strip containing the zinc-iron alloy layer is flattened, straightened, surface passivated, oiled, trimmed and coiled.

[0021] Example 2, please refer to Figure 4 As shown, Figure 4The schematic diagram of the structure of an electronic device is illustrated, and the electronic device may include: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus. The memory stores computer-readable instructions, and the processor can call the instructions in the memory. When the computer-readable instructions are executed by the processor, the steps in a method for producing galvanized steel strip are executed to achieve the following functions: first, the steel coil is unrolled and the steel strip is continuously obtained, and the tail and head of the front and rear steel strips are welded; the steel strip is pretreated based on pickling and degreasing cleaning; the pretreated steel strip is recorded as the steel strip to be annealed; then, the annealable temperature is obtained based on the heating temperature that the annealing equipment can provide, and the annealing treatment of the steel strip to be annealed is analyzed using the annealing temperature control method, and the annealing temperature is obtained based on the analysis result. control set, wherein the annealing temperature control set includes multiple annealing temperatures; the steel strip to be annealed is annealed based on the annealing temperature control set, and the annealed steel strip is placed in a solution containing zinc salt, and the surface of the steel strip is galvanized based on an electrolytic device; the electrolytic current analysis method is used based on the annealing temperature control set to obtain the optimal current density corresponding to different annealing temperatures; finally, the galvanized steel strip is heated until a zinc-iron alloy layer is generated, and based on the post-processing stage of the production process of the galvanized steel strip, the steel strip containing the zinc-iron alloy layer is flattened, straightened, surface passivated, oiled, trimmed and coiled.

[0022] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0023] Embodiment 3, the present application also provides a computer-readable storage medium, the present application provides a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps in the above method for producing galvanized steel strip are executed to achieve the following functions: first, the steel coil is unrolled and the steel strip is continuously obtained, and the tail and head of the front and rear steel strips are welded; the steel strip is pretreated based on pickling and degreasing cleaning; the pretreated steel strip is recorded as the steel strip to be annealed; then, the annealing temperature is obtained based on the heating temperature that the annealing equipment can provide, and the annealing treatment of the steel strip to be annealed is analyzed using the annealing temperature control method, and based on the analysis results The result is to obtain an annealing temperature control set, wherein the annealing temperature control set includes multiple annealable temperatures; the steel strip to be annealed is annealed based on the annealing temperature control set, and the annealed steel strip is placed in a solution containing zinc salt, and the surface of the steel strip is galvanized based on an electrolytic device; the optimal current density corresponding to different annealing temperatures is obtained by using an electrolytic current analysis method based on the annealing temperature control set; finally, the galvanized steel strip is heated until a zinc-iron alloy layer is generated, and based on the post-processing stage of the production process of the galvanized steel strip, the steel strip containing the zinc-iron alloy layer is flattened, straightened, surface passivated, oiled, trimmed, and coiled.

[0024] Through the description of the above implementation methods, the embodiments of the present invention can be provided as methods, systems or computer program products. Based on such an understanding, the above technical solutions can be essentially or partly contributed to the prior art in the form of software products, which can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and include several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0025] In the embodiments provided in the present application, it should be understood that the disclosed system or method can be implemented in other ways. The embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of systems, modules and units can be electrical, mechanical or other forms.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for producing galvanized steel strip, characterized in that: The steps include: The steel coil is unrolled and the strip steel is continuously obtained, and the tail and head of the front and rear strip steels are welded; the strip steel is pretreated based on pickling and degreasing cleaning; and the pretreated strip steel is recorded as the strip steel to be annealed; Acquire an annealable temperature based on a heating temperature that can be provided by the annealing equipment, analyze the annealing treatment of the annealed strip using an annealing temperature control method, and acquire an annealing temperature control set based on the analysis result, wherein the annealing temperature control set includes a plurality of annealable temperatures; Based on the annealing temperature control set, the steel strip to be annealed is annealed, and the annealed steel strip is placed in a solution containing zinc salt, and the surface of the steel strip is galvanized based on an electrolytic device; based on the annealing temperature control set, the electrolytic current analysis method is used to obtain the optimal current density corresponding to different annealing temperatures; The galvanized steel strip is heated until a zinc-iron alloy layer is formed, and the strip containing the zinc-iron alloy layer is flattened, straightened, surface passivated, oiled, trimmed and coiled based on the post-processing stage of the galvanized steel strip production process.

2. The method for producing galvanized steel strip according to claim 1, characterized in that: Annealing temperature control methods include: Based on the thickness of the strip to be annealed and the process requirements, the heating temperature, holding time and temperature of the strip after cooling are obtained during annealing, and are recorded as annealing temperature, annealing holding time and annealing cooling temperature respectively; the heating temperatures that can be provided by the annealing equipment during annealing and are greater than the annealing temperature are recorded from small to large as annealable temperature KT1 to annealable temperature KT c ; For any annealing temperature KT b , using annealing temperature KT b The annealing strip is heated until the temperature of the annealing strip reaches the annealing temperature, the heating of the annealing strip is stopped, and the annealing strip is kept warm. When the warm-keeping time reaches the annealing warm-keeping time, the annealing strip is cooled with the furnace until the temperature of the annealing strip reaches the annealing cooling temperature, wherein b is a positive integer less than or equal to c and greater than or equal to 1; Get the annealing temperature KT b The temperature data of the steel strip to be annealed during the process of starting to heat the steel strip to the temperature of the steel strip to be annealed is the annealing cooling temperature, and is recorded as annealing temperature data.

3. The method for producing galvanized steel strip according to claim 2, characterized in that: Annealing temperature control method also includes: A plane rectangular coordinate system is established and recorded as the annealing analysis coordinate system, where the unit of the X-axis of the annealing analysis coordinate system is time and the unit of the Y-axis is temperature; based on the annealing temperature KT b The corresponding curve is drawn in the quadrant of the annealing analysis coordinate system, and is recorded as the annealing analysis curve, where the leftmost point of the annealing analysis curve is (0, y1), the rightmost point is (x1, y2), and y1 is the annealing temperature KT of the strip to be annealed. b The temperature before heating, x1 is the annealing temperature KT of the strip to be annealed b The sum of the heating time, the holding time and the furnace cooling time, y2 is the annealing cooling temperature.

4. The method for producing galvanized steel strip according to claim 3, characterized in that: Annealing temperature control method also includes: The area where the slope of the annealing analysis curve is greater than 0 is recorded as the temperature increase area, and the area where the slope of the annealing analysis curve is less than 0 is recorded as the temperature decrease area; the annealing analysis algorithm is used to obtain the annealing analysis parameters corresponding to the annealing analysis curve; the annealing analysis algorithm is: , where F is the annealing analysis parameter, t1 is the length of the heating area in the X-axis, t2 is the length of the cooling area in the X-axis, and k max is the maximum value of the slope in the temperature rising area, h max is the maximum value of the slope in the cooling area, k min is the minimum value of the slope in the temperature rising region, h min is the minimum slope in the cooling area, k sq is the average value of the slope of all points in the heating region, h sq is the average of the slopes of all points in the cooling region.

5. The method for producing galvanized steel strip according to claim 4, characterized in that: Annealing temperature control method also includes: The annealing analysis curves and annealing analysis parameters corresponding to all annealable temperatures KT are obtained; the average value of all annealing analysis parameters is recorded as the annealing measurement parameter, and the set of annealable temperatures KT whose annealing analysis parameters are less than the annealing measurement parameter is recorded as the annealing temperature control set.

6. The method for producing galvanized steel strip according to claim 5, characterized in that: Annealing the steel strip to be annealed based on the annealing temperature control set, and placing the annealed steel strip into a solution containing zinc salt, and galvanizing the surface of the steel strip based on the electrolytic equipment includes: For any annealable temperature KT in the annealing temperature control set, the steel strip to be annealed is placed in the annealing equipment based on the annealable temperature KT and annealed, and the steel strip to be annealed after the annealing is recorded as the steel strip to be plated; the current density that the electrolysis equipment can provide during electrolysis is recorded as the electrolysis density KM1 to the electrolysis density KM n ; Based on the process requirements of the strip, the thickness of the zinc layer on the surface of the strip is obtained and recorded as the standard thickness.

7. A method for producing galvanized steel strip according to claim 6, characterized in that: Annealing the steel strip to be annealed based on the annealing temperature control set, and placing the annealed steel strip into a solution containing zinc salt, and galvanizing the surface of the steel strip based on the electrolytic equipment also includes: Galvanizing treatment includes: for any electrolytic density KM m , put the steel strip to be plated into a solution containing zinc salt, and based on the electrolytic density KM m The electrolytic device is used to electrolyze the solution in which the steel strip to be plated is located, and the thickness of the zinc layer on the surface of the steel strip to be plated is obtained in real time. When the thickness of the zinc layer reaches the standard thickness, the electrolytic device is turned off, wherein m is a positive integer less than or equal to n and greater than or equal to 1.

8. The method for producing galvanized steel strip according to claim 7, characterized in that: The electrolytic current method includes: Use electrolytic density KM1 to electrolytic density KM in sequence n The n steel strips to be plated are subjected to galvanizing treatment, and the data corresponding to the thickness of the zinc layer on the surface of the steel strips to be plated during the galvanizing treatment are recorded as galvanizing thickness data DH1 to galvanizing thickness data DH n ; A plane rectangular coordinate system is established and recorded as the galvanizing analysis coordinate system, where the unit of the X-axis of the galvanizing analysis coordinate system is time and the unit of the Y-axis is mm; for any galvanizing thickness data DH m , a curve is drawn in the galvanizing analysis coordinate system based on the average thickness of the zinc layer on the surface of the steel strip to be plated after the electrolytic equipment is started, and it is recorded as the average zinc layer curve; a curve is drawn in the galvanizing analysis coordinate system based on the maximum thickness of the zinc layer on the surface of the steel strip to be plated after the electrolytic equipment is started, and it is recorded as the maximum zinc layer curve; the points in the average zinc layer curve and the maximum zinc layer curve whose ordinate is the standard thickness and whose abscissa is the smallest are recorded as the average point and the maximum point, respectively.

9. A method for producing galvanized steel strip according to claim 8, characterized in that: The electrolytic current method also includes: Use zinc layer analysis algorithm to obtain galvanized thickness data DH m The corresponding galvanizing analysis parameters and zinc layer analysis algorithm are: R=A1×A2×A3, where A1 is the abscissa of the average point, A2 is the abscissa of the maximum point, and A3 is the absolute value of the difference between the abscissa of the average point and the abscissa of the maximum point; Get all galvanizing thickness data DH m The galvanizing analysis parameters are calculated, and the electrolytic density KM corresponding to the minimum galvanizing analysis parameter is recorded as the optimal current density for the annealing temperature KT; The optimal current density of all annealable temperatures KT is obtained, and the temperature-density complementary algorithm is used to obtain the temperature-density parameters of each annealable temperature KT. The temperature-density complementary algorithm is: , where G is the temperature density parameter, R is the galvanizing analysis parameter corresponding to the optimal current density of the annealing temperature KT, and F is the annealing analysis parameter corresponding to the annealing temperature KT; The annealing temperature KT corresponding to the minimum value of all temperature and density parameters is recorded as the optimal annealing temperature, and the optimal annealing temperature and the optimal current density of the optimal annealing temperature are used to perform annealing and galvanizing treatment on the steel strip to be annealed.

10. A method for producing galvanized steel strip according to claim 9, characterized in that: Heating the galvanized steel strip until a zinc-iron alloy layer is formed includes: For any galvanized steel strip: the thickness of the zinc-iron alloy layer is obtained based on the process requirements and recorded as the zinc-iron thickness; the steel strip is heated until the zinc-iron alloy layer is generated and the thickness of the zinc-iron alloy layer is the zinc-iron thickness.

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