Method and device for reducing copper brittleness defects in hot continuous rolling weathering steels

Abstract

The present application relates to the technical field of hot-rolled strip steel production in the metallurgical industry, and discloses a control method and device for reducing copper brittleness defects of hot continuous rolling weathering steel. The control method comprises determining the maximum length and minimum length of the heating stage of the slab according to the furnace entry temperature; placing the slab into the heating furnace and determining the in-furnace time of the slab in the heating stage; determining whether there is an abnormal situation in the hot rolling production line; when the hot rolling production line is normal, if the minimum length is less than or equal to the in-furnace time and the in-furnace time is less than or equal to the maximum length, the slab is continuously heated and produced; when the hot rolling production line is abnormal, if the minimum length is less than or equal to the in-furnace time and the in-furnace time is less than or equal to the maximum length, the slab is kept warm before rolling and the heating stage is continued after the production line recovers. The method reduces copper brittleness defects by controlling the outlet temperature and in-furnace time of each stage in the heating furnace.

Description

Technical Field

[0001] This application relates to the field of hot-rolled strip steel production technology in the metallurgical industry, and in particular to a control method and device for reducing copper embrittlement defects in hot-rolled weathering steel. Background Technology

[0002] Cu is one of the main alloying elements widely used to improve the atmospheric corrosion resistance of steel. The reason Cu imparts good corrosion resistance to steel is primarily because, during atmospheric corrosion, Cu acts as an activated cathode, promoting anodic passivation and thus slowing down atmospheric corrosion. Additionally, the addition of Cu to steel forms a dense, thin copper oxide interlayer between the corrosion layer and the copper-rich layer, creating a double-layered rust layer. This inner layer adheres tightly to the steel substrate, is very dense and complete, and has strong adhesion, effectively mitigating the corrosion of the steel plate's interior by corrosive media. However, Cu's enrichment effect in steel makes the production of hot-rolled copper-containing steel plates more difficult. This is because steel with a copper content greater than 0.25%, when heated at high temperatures for extended periods in a strongly oxidizing atmosphere, undergoes an oxidation reaction with the steel, reducing the iron content on the surface and relatively increasing the copper content. When this copper content exceeds its solubility in iron, it diffuses along grain boundaries, forming a network of copper-rich phases. Because the heating temperature of steel is higher than the melting point of copper (1083℃), the copper-rich phase is in a molten state. When it reaches a certain level, it will cause surface cracking during rolling, forming "copper brittleness" crack defects. In mild cases, surface cleaning is required, and in severe cases, the steel will be scrapped.

[0003] Currently, the treatment of "copper embrittlement" defects mainly focuses on two aspects. The first is increasing Ni; when Ni / Cu ≥ 0.5, it can effectively inhibit the enrichment of liquid-phase Cu, thus effectively controlling the copper embrittlement defect. The second is to optimize the thermal regime, avoiding the enrichment of liquid-phase copper through rapid high-temperature heating, and controlling measures such as hot rolling time in the furnace, descaling high-pressure water pressure, and rough rolling temperature to control the "copper embrittlement" defect. However, adding Ni increases costs, and rapid high-temperature heating is not always better the faster it is; the tapping temperature requirements must be met.

[0004] Therefore, existing technologies still need improvement. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] To address the shortcomings of existing technologies, this disclosure provides a control method and apparatus for reducing copper embrittlement defects in hot-rolled weathering steel, thereby reducing copper embrittlement defects by controlling the exit temperature and furnace time at each stage of the heating furnace.

[0007] In a first aspect, embodiments of this disclosure provide a control method for reducing copper embrittlement defects in hot-rolled weathering steel, comprising: determining the maximum and minimum duration of the heating stage of the slab based on the furnace entry temperature; placing the slab into the heating furnace and determining the slab's time in the furnace during the heating stage; determining whether there is an abnormality in the hot rolling production line; when the hot rolling production line is normal, if the minimum duration ≤ the time in the furnace ≤ the maximum duration, then the slab is continuously heated and produced; when the hot rolling production line is abnormal, if the minimum duration ≤ the time in the furnace ≤ the maximum duration, then the slab is subjected to pre-rolling heat preservation and the heating stage continues after the production line recovers.

[0008] In the preferred embodiment of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, the heating stage of the slab includes a preheating section, a first heating section, a second heating section, and a soaking section, wherein the outlet temperature of the preheating section is ≤1000℃, the outlet temperature of the first heating section is ≤1250℃, the outlet temperature of the second heating section is ≤1300℃, and the outlet temperature of the soaking section is ≤1280℃.

[0009] In the preferred technical solution of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, the step of "determining the maximum and minimum duration of the heating stage based on the furnace inlet temperature" includes measuring the temperature of the slab before it enters the heating furnace and using it as the furnace inlet temperature; determining the minimum and maximum duration of the heating stage based on the temperature range of the furnace inlet temperature; wherein, when the furnace inlet temperature is <400℃, the minimum duration is 190 minutes and the maximum duration is 300 minutes; when 400℃≤furnace inlet temperature≤600℃, the minimum duration is 180 minutes and the maximum duration is 300 minutes; when the furnace inlet temperature is >600℃, the minimum duration is 170 minutes and the maximum duration is 300 minutes.

[0010] In the preferred technical solution of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, the "placing the slab in the heating furnace and determining the slab's time in the furnace during the heating stage" includes, after the slab is placed in the heating furnace, continuously heating the slab in sequence according to four stages: preheating section, first heating section, second heating section and soaking section, and determining the slab's time in the furnace when the slab is heated to the second heating section.

[0011] In the preferred technical solution of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, the "stage of preheating and holding the slab in place during hot rolling production line abnormalities and continuing heating after production line recovery" includes, when the time of the hot rolling production line abnormality affecting production is ≤t minutes, reducing the outlet temperature of the soaking section and the second heating section by 50℃-100℃ for preheating and holding the slab in place and continuing heating after production line recovery; when the time of the hot rolling production line abnormality affecting production is >t minutes, changing the outlet temperature of the preheating section, the first heating section, the second heating section, and the soaking section for preheating and holding the slab in place and continuing heating after production line recovery, wherein the outlet temperature of the preheating section is ≤900℃, the outlet temperature of the first heating section is ≤1080℃, the outlet temperature of the second heating section is ≤1080℃, and the outlet temperature of the soaking section is ≤1080℃.

[0012] In the preferred embodiment of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, the control method further includes raising the temperature t0 minutes before production resumes when the time of abnormal impact on production in the hot rolling production line is ≤t minutes, wherein t0 <t。

[0013] In the preferred technical scheme of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, the value of t is 30 minutes and the value of t0 is 10 minutes.

[0014] In the preferred embodiment of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, the control method further includes, when the hot rolling production line is operating normally, if it is determined that the time in the furnace is less than the minimum time, then after heating in the soaking zone, the slab is kept at a constant temperature until the total time reaches the minimum time to meet the furnace exit temperature requirement; if it is determined that the time in the furnace is greater than the maximum time, then the slab is returned to the furnace for processing.

[0015] In the preferred technical scheme of the above-mentioned control method for reducing copper embrittlement defects in hot-rolled weathering steel, if the furnace time is determined to be greater than the maximum duration + t1 when the hot rolling production line is abnormal, the slab will be returned to the furnace.

[0016] In a second aspect, embodiments of this disclosure provide a control device for reducing copper embrittlement defects in hot-rolled weathering steel, comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the aforementioned control method for reducing copper embrittlement defects in hot-rolled weathering steel when executing the program instructions.

[0017] The method, apparatus, and heating furnace for reducing copper embrittlement defects in hot-rolled weathering steel provided in this disclosure can achieve the following technical effects:

[0018] First, the furnace inlet temperature is combined with different upper and lower limits of heating time. By corresponding different maximum and minimum heating times to the furnace inlet temperature before the slab enters the heating furnace, copper embrittlement defects are controlled within a reasonable range. Furthermore, by changing the outlet temperature and setting the waiting time for rolling when hot rolling is found to be abnormal, the high-temperature period is reduced, thereby reducing copper embrittlement defects.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0021] Figure 1 A schematic flowchart of a control method for reducing copper embrittlement defects in hot-rolled weathering steel provided by the present invention is shown.

[0022] Figure 2 A flowchart illustrating another control method for reducing copper embrittlement defects in hot-rolled weathering steel provided by the present invention is shown.

[0023] Figure 3 The diagram shows a control device for reducing copper embrittlement defects in hot-rolled weathering steel provided by the present invention.

[0024] Figure label:

[0025] 100. Processor; 101. Memory; 102. Communication interface; 103. Bus. Detailed Implementation

[0026] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0027] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0028] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0029] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0030] Unless otherwise stated, the term "multiple" means two or more.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0032] like Figure 1 As shown, embodiments of this disclosure provide a method for controlling copper embrittlement defects in hot-rolled weathering steel, comprising:

[0033] Step S1: Determine the maximum and minimum duration of the heating stage for the slab based on the furnace entry temperature;

[0034] Step S2: Place the slab into the heating furnace and determine the slab's time in the furnace during the heating stage;

[0035] Step S3: Determine if there are any abnormalities in the hot rolling production line;

[0036] Step S4: When the hot rolling production line is operating normally, if the minimum duration ≤ furnace time ≤ maximum duration, the slab will be continuously heated and produced.

[0037] Step S5: If the minimum duration is less than or equal to the furnace time and the maximum duration is less than or equal to the maximum duration, the slab is kept warm before rolling and then heated again after the production line is restored.

[0038] Specifically, the heating furnace of this application is preferably a regenerative heating furnace. Extensive experiments have yielded ranges of heating times corresponding to different furnace entry temperatures. Based on the hot rolling production line, the furnace entry temperature of the slab is determined before it enters the heating furnace. Once the furnace entry temperature is obtained, the minimum and maximum heating times are selected from the range of heating times. The heating stage begins after the slab is placed into the heating furnace, and the furnace simultaneously determines the slab's in-furnace time. If the in-furnace time is within the minimum and maximum range, and the hot rolling production line is operating normally, the entire heating process is completed. If the hot rolling production line reports an abnormality, production must be stopped to handle the abnormality. In this case, the slab's pre-rolling holding time is determined based on the length of the stoppage, and the heating stage resumes after the production line recovers.

[0039] In the preferred embodiment of this application, the heating stage of the slab includes a preheating section, a first heating section, a second heating section, and a soaking section, wherein the outlet temperature of the preheating section is ≤1000℃, the outlet temperature of the first heating section is ≤1250℃, the outlet temperature of the second heating section is ≤1300℃, and the outlet temperature of the soaking section is ≤1280℃.

[0040] Specifically, heating the slab in the furnace in four stages yields better results. Extensive experiments have shown that controlling the outlet temperature of each stage as described above ensures the slab's exit performance meets requirements, and by coordinating this with the in-furnace time, the probability of copper embrittlement defects can be effectively controlled.

[0041] In the preferred embodiment of this application, "determining the maximum and minimum duration of the heating stage based on the furnace entry temperature" includes: measuring the temperature of the slab before it enters the heating furnace and using it as the furnace entry temperature; determining the minimum and maximum duration of the heating stage based on the temperature range of the furnace entry temperature; wherein, when the furnace entry temperature is <400℃, the minimum duration is 190 minutes and the maximum duration is 300 minutes; when 400℃ ≤ furnace entry temperature ≤ 600℃, the minimum duration is 180 minutes and the maximum duration is 300 minutes; and when the furnace entry temperature is >600℃, the minimum duration is 170 minutes and the maximum duration is 300 minutes.

[0042] Specifically, before the slab enters the heating furnace, its temperature is measured using a tool to determine the optimal temperature range, which ultimately determines the maximum and minimum heating time. The correspondence between the furnace temperature range and the maximum and minimum heating times was established through extensive experimentation. Heating below the minimum time will result in insufficient heating of the slab, failing to meet production requirements. Heating above the maximum time will lead to copper cracking. Within the specified range, the requirements for controlling copper embrittlement defects are met; the closer the heating time is to the minimum, the better.

[0043] In the preferred technical solution of the present application, "placing the slab into the heating furnace and judging the in-furnace time of the slab during the heating stage" includes, after the slab is placed into the heating furnace, continuously heating the slab in sequence according to four stages: the preheating section, the first heating section, the second heating section, and the soaking section, and determining the in-furnace time of the slab when the slab is heated to the second heating section.

[0044] Specifically, the four heating stages are carried out continuously. After the slab enters the heating furnace for production, the in-furnace time of the slab can only be finally determined until the second heating section, and only then can it be judged whether the in-furnace time meets the corresponding interval.

[0045] As Figure 2 shown, in the preferred technical solution of the present application, "when the hot rolling production line is abnormal, performing holding for standby rolling on the slab and continuing the heating stage after the production line is restored" further includes:

[0046] Step S51: When the time when the hot rolling production line is abnormal and affects production ≤ t minutes, reducing the outlet temperatures of the soaking section and the second heating section by 50°C - 100°C for holding for standby rolling and continuing the heating stage after the production line is restored;

[0047] Step S52: When the time when the hot rolling production line is abnormal and affects production > t minutes, changing the outlet temperatures of the preheating section, the first heating section, the second heating section, and the soaking section for holding for standby rolling and continuing the heating stage, wherein the outlet temperature of the preheating section ≤ 900°C, the outlet temperature of the first heating section ≤ 1080°C, the outlet temperature of the second heating section ≤ 1080°C, and the outlet temperature of the soaking section ≤ 1080°C.

[0048] Specifically, when the hot rolling production line is abnormal, an abnormal handling time will be fed back to the heating furnace at this time. If this time is within a certain range, only the outlet temperatures of the soaking section and the second heating section need to be reduced. If the abnormality occurs before the second heating section, the outlet temperatures of both sections are reduced. If the abnormality occurs in the soaking section, only the outlet temperature of the soaking section can be reduced, or both sections can be reduced. However, since the second heating section is already completed, whether to reduce it or not does not affect. When the abnormal handling time exceeds this range, the outlet temperatures of all four stages need to be reduced. Similarly, since it is not certain at which stage the abnormality occurs, whether to reduce the temperature before the abnormal stage does not affect.

[0049] In the preferred technical solution of the present application, the control method further includes: when the time when the hot rolling production line is abnormal and affects production ≤ t minutes, raising the temperature t0 minutes before the production is restored, where t0 < t. The value of t is 30 minutes, and the value of t0 is 10 minutes.

[0050] Specifically, when the anomaly handling time is within a certain range, it is not necessary to wait until the anomaly is completely handled before starting heating; instead, the temperature should be raised t0 minutes in advance. Based on extensive experiments, the preferred value for t is 30 minutes, and the preferred value for t0 is 10 minutes. t can also take other values, such as 40 minutes, 45 minutes, etc.

[0051] In the preferred embodiment of this application, the control method further includes, when the hot rolling production line is operating normally, if it is determined that the time in the furnace is less than the minimum duration, then after heating in the soaking zone is completed, the slab is kept warm until the total duration reaches the minimum duration to meet the furnace exit temperature requirement; if it is determined that the time in the furnace is greater than the maximum duration, then the slab is returned to the furnace for processing.

[0052] Specifically, in addition to ensuring control of copper embrittlement defects, the performance requirements of the slab must also be met. The heating process must not be shorter than the minimum duration. If it is shorter than the minimum duration, the soaking zone must be kept at a constant temperature until the total duration reaches the minimum. Furthermore, if the total duration exceeds the minimum, the slab does not need further processing and can be returned to the furnace.

[0053] In the preferred embodiment of this application, the control method further includes, when the hot rolling production line is abnormal, if it is determined that the time in the furnace is greater than the maximum duration + t1, then the slab is returned to the furnace.

[0054] Specifically, the same applies to abnormal situations. Once the total timeout period is exceeded, there is no need to process the slab further; it can simply be returned to the furnace. The preferred value for t1 is 30 minutes.

[0055] like Figure 3 As shown, an embodiment of this disclosure provides a control device for reducing copper embrittlement defects in hot-rolled weathering steel, including a processor 100 and a memory 101. Optionally, the battery management system may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the battery remaining life estimation method of the above embodiment.

[0056] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0057] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, it implements the battery remaining life estimation method in the above embodiments.

[0058] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0059] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0060] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0061] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0062] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0063] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling copper embrittlement defects in hot-rolled weathering steel, characterized in that, Includes the following steps: The maximum and minimum duration of the heating stage of the slab are determined based on the furnace entry temperature. The slab is placed into the heating furnace, and the furnace time of the slab is determined during the heating stage; Determine if there are any abnormalities in the hot rolling production line; When the hot rolling production line is operating normally, if the minimum duration ≤ furnace time ≤ maximum duration, the slab will be continuously heated and produced. If the minimum duration is less than or equal to the furnace time and the maximum duration is less than or equal to the maximum duration, the slab will be kept warm before rolling and will continue to be heated after the production line is restored. The heating stage of the slab includes a preheating section, a first heating section, a second heating section, and a homogenization section; The step of placing the slab into the heating furnace and determining the slab's time in the furnace during the heating stage includes: After the slab is placed into the heating furnace, it is continuously heated in four stages: preheating section, first heating section, second heating section and soaking section. The furnace time of the slab is determined when it is heated to the second heating section. The stage of preheating the slab before rolling and continuing heating after the production line is restored during an abnormality includes: When the time that the hot rolling production line is affected by an abnormality is ≤t minutes, the outlet temperature of the soaking section and the second heating section is reduced by 50℃-100℃ for pre-rolling heat preservation and the heating stage continues after the production line is restored. When the time that abnormality affects production on the hot rolling production line exceeds t minutes, the outlet temperatures of the preheating section, the first heating section, the second heating section, and the soaking section are changed for pre-rolling heat preservation and heating is continued after the production line recovers. Specifically, the outlet temperature of the preheating section is ≤900℃, the outlet temperature of the first heating section is ≤1080℃, the outlet temperature of the second heating section is ≤1080℃, and the outlet temperature of the soaking section is ≤1080℃.

2. The control method according to claim 1, characterized in that, During normal production on the hot rolling production line, the outlet temperature of the preheating section is ≤1000℃, the outlet temperature of the first heating section is ≤1250℃, the outlet temperature of the second heating section is ≤1300℃, and the outlet temperature of the soaking section is ≤1280℃.

3. The control method according to claim 1, characterized in that, The determination of the maximum and minimum duration of the heating stage based on the furnace inlet temperature includes: Measure the temperature of the slab before it enters the heating furnace and use it as the furnace entry temperature; The minimum and maximum duration of the heating stage are determined based on the temperature range of the furnace inlet temperature. Specifically, when the furnace temperature is <400℃, the minimum duration is 190 minutes and the maximum duration is 300 minutes; when the furnace temperature is 400℃≤furnace temperature≤600℃, the minimum duration is 180 minutes and the maximum duration is 300 minutes; when the furnace temperature is >600℃, the minimum duration is 170 minutes and the maximum duration is 300 minutes.

4. The control method according to claim 1, characterized in that, The control method further includes: When the time of production disruption on the hot rolling production line is ≤t minutes, the temperature is increased t0 minutes before production resumes, where t0... <t。 5. The control method according to claim 4, characterized in that, The value of t is 30 minutes, and the value of t0 is 10 minutes.

6. The control method according to claim 2, characterized in that, The control method further includes: When the hot rolling production line is operating normally, if it is determined that the furnace time is less than the minimum time, then after heating in the soaking zone is completed, the furnace is kept warm until the total time reaches the minimum time to meet the furnace exit temperature requirements. If the furnace time is determined to be greater than the maximum duration, the slab will be returned to the furnace for processing.

7. The control method according to claim 2, characterized in that, The control method further includes: If the hot rolling production line is abnormal and it is determined that the furnace time is greater than the maximum duration + t1, the slab will be returned to the furnace.

8. A control device for reducing copper embrittlement defects in hot-rolled weathering steel, characterized in that, The invention includes a processor and a memory storing program instructions, characterized in that the processor is configured to, when executing the program instructions, perform a control method for reducing copper embrittlement defects in hot-rolled weathering steel as described in any one of claims 1 to 7.

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