Method for controlling depth of pits on surface of strip steel in DP steel production process

Abstract

The invention discloses a method for controlling the depth of pits on the surface of strip steel in the DP steel production process, and relates to the technical field of DP steel production. The method comprises the steps that pretreatment and detection adjustment are conducted on an inlet cleaning section and an industrial furnace of a DP steel production line; in the target area of the industrial furnace, tension borne by the strip steel is adjusted; the fan power in the rapid cooling area is reduced to be within a preset range; the pressure in the industrial furnace is set according to a preset value, heat dissipation of a third subarea of the heating area is opened, and outlet sealing purging is started; before strip steel enters the production process, the temperature and humidity of the industrial furnace and the inlet cleaning section are adjusted; and based on the adjusted industrial furnace and the DP steel production line, the depth of the pits on the surface of the strip steel is controlled in the DP steel production process.

Description

Technical Field

[0001] The present application relates to the technical field of DP steel production, and in particular to a method for controlling the depth of pitting on the surface of a steel strip during the production of DP steel. Background Art

[0002] The continuous annealing furnace is the most important equipment in the continuous annealing line. The internal structure of the strip is changed through the annealing furnace to meet the process requirements. Therefore, the performance and surface quality requirements are extremely high. Since it is impossible for the surface of the strip entering the furnace to achieve 100% cleanliness, when DP steel (Dual Phase Steel) is produced, its components are rapidly oxidized by high temperature, react chemically with the surface material of the furnace roller, form adhesive substances, and form nodules on the furnace roller. When the strip comes into contact with the furnace roller, pitting defects are formed, which seriously affect the product quality. If the pitting cannot go down and remains on the furnace roller for a long time, the defects will worsen, and the nodules on the surface of the furnace roller will become larger and larger, forming more serious defects such as rubbing marks, and the depth exceeds the standard, which seriously affects the surface quality. It makes it impossible for subsequent high-level automotive plates to be produced on time with guaranteed quality and quantity and delivered to customers on time. In addition, since the annealing furnace equipment is sealed, high-temperature and high-speed, it is extremely difficult to handle and there are major safety hazards.

[0003] The direct cause of pitting in the furnace is usually caused by foreign matter adhering to the furnace rollers. The pitting defects on the surface of the strip steel, which are unique to the continuous annealing unit, lead to the surface nodule phenomenon of the furnace rollers, which are unique to the continuous annealing unit. When producing high-strength steel in continuous annealing, the dew point in the annealing furnace is -50°C, and the Si and Mn elements on the surface of the strip steel are severely oxidized on the surface of the strip steel. As a result, many irregular impressions (black spots) without hand feeling begin to appear on the upper surface of the continuous annealing strip steel, which are mainly distributed in the middle of the upper surface of the strip steel on the operating side. As the production progresses, black spots also begin to appear on the lower surface, located in the middle of the lower surface of the strip steel. The depth of the pitting defect exceeds the standard and cannot meet the surface requirements of the strip steel.

[0004] Therefore, how to control the depth and density of pitting on the surface of the strip in the industrial furnace to meet customer demand for product standards has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In a first aspect, the present application proposes a method for controlling the pit depth on the surface of a strip steel during the production process of DP steel, comprising:

[0007] Pre-treat and detect and adjust the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pitting on the strip surface;

[0008] In the target area of the industrial furnace, adjust the tension on the strip to control the generation of pitting on the strip surface, where the target area is the third partition of the heating zone, the soaking zone and the rapid cooling zone, and the strip is made of DP steel;

[0009] Reduce the fan power in the rapid cooling zone within a preset range to control the depth of pitting on the strip surface;

[0010] Set the pressure in the industrial furnace according to a preset value, open the heat dissipation of the third partition of the heating area, and turn on the outlet seal purge to keep the atmosphere in the industrial furnace balanced;

[0011] Before the strip enters the production process, adjust the temperature and humidity of the industrial furnace and the inlet cleaning section;

[0012] Based on the adjusted industrial furnace and the DP steel production line, control the depth of pitting on the strip surface during the DP steel production process.

[0013] In a feasible implementation manner, the pre-treating and detecting and adjusting the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pitting on the strip surface includes:

[0014] Clean and inspect the inlet cleaning section of the DP steel production line to reduce the generation of pitting on the strip surface;

[0015] Detect the airtightness of each area in the industrial furnace and adjust the radiant tubes in the furnace area through the waste gas analysis results.

[0016] In a feasible implementation manner, the adjusting the radiant tubes in the furnace area through the waste gas analysis results includes:

[0017] Real-time monitor the components of the waste gas generated by combustion in the industrial furnace to obtain the waste gas analysis results;

[0018] Adjust the combustion condition of the radiant tubes according to the waste gas analysis results so that the proportion of various gases in the atmosphere in the industrial furnace meets the requirements of strip heat treatment.

[0019] In a feasible implementation manner, the adjusting the temperature and humidity of the industrial furnace and the inlet cleaning section before the strip enters the production process includes:

[0020] Before the strip enters the production process, turn on the steam tracing in the industrial furnace and raise the cleaning temperature of the inlet cleaning section to a preset temperature;

[0021] Two hours before the strip enters the production process, adjust the humidity in the industrial furnace to the target value so that the dew point of the strip in the heating zone is within the target range.

[0022] In a feasible implementation, cleaning and inspection are performed on the inlet cleaning section of the DP steel production line to reduce the generation of pitting on the strip surface, including:

[0023] One hour before the strip enters the production process, drain the waste in the tanks of the inlet cleaning section;

[0024] Check whether the magnetic filtration is normal;

[0025] Adjust the brush roll current according to the target current value.

[0026] In a feasible implementation, the atmosphere refers to the composition, proportion, and corresponding gas environment state of the gas in the industrial furnace.

[0027] In a feasible implementation, based on the adjusted industrial furnace and the DP steel production line, controlling the depth of pitting on the strip surface during DP steel production includes:

[0028] Based on the adjusted industrial furnace and the DP steel production line, turn on the grinding roll in the heating zone to control the depth of pitting on the strip surface during DP steel production.

[0029] In a second aspect, the present application proposes a system for controlling the depth of pitting on the strip surface during DP steel production, which is applied to the method for controlling the depth of pitting on the strip surface during DP steel production described in any of the above embodiments, including:

[0030] A cleaning and detection unit for preprocessing, detecting, and adjusting the inlet cleaning section of the DP steel production line and the industrial furnace to reduce the generation of pitting on the strip surface;

[0031] A tension adjustment unit for adjusting the tension applied to the strip within the target area of the industrial furnace to control the generation of pitting on the strip surface, where the target area is the third partition of the heating zone, the soaking zone, and the rapid cooling zone, and the strip is made of DP steel;

[0032] A power adjustment unit for reducing the fan power in the rapid cooling zone within a preset range to control the depth of pitting on the strip surface;

[0033] A pressure adjustment unit for setting the pressure in the industrial furnace according to a preset value, opening the heat dissipation of the third partition of the heating area, and turning on the outlet seal purge to keep the atmosphere in the industrial furnace balanced;

[0034] A temperature and humidity adjustment unit, configured to adjust the temperature and humidity of the industrial furnace and the inlet cleaning section before the strip enters the production process;

[0035] A production control unit, configured to control the depth of surface pitting of the strip during the production of DP steel based on the adjusted industrial furnace and the DP steel production line.

[0036] In a third aspect, an electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program stored in the memory, the steps of the method for controlling the depth of surface pitting of the strip during the production of DP steel according to any one of the first aspects described above are implemented.

[0037] In a fourth aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for controlling the depth of surface pitting of the strip during the production of DP steel according to any one of the first aspects are implemented.

[0038] In summary, the method for controlling the depth of surface pitting of the strip during the production of DP steel proposed in the present application adjusts key parameters such as the dew point and oxygen content in the annealing furnace, converts external oxidation to internal oxidation in the heating section of the furnace, and achieves the purpose of inhibiting alloy elements. It can control the depth and density of surface pitting of the strip in the furnace, meet the customer's required standards for products, avoid the problem that the depth of large-area pitting defects on the strip surface exceeds the standard, and solve the problems such as the extremely difficult treatment due to the sealing, high temperature, and high-speed operation of the annealing furnace equipment. It is easy to operate, has strong popularization value and application prospects. In addition, the method is simple to operate and convenient and fast to process.

[0039] For the method for controlling the depth of surface pitting of the strip during the production of DP steel proposed in the present application, other advantages, objectives, and features of the present application will be partially reflected by the following description, and partially will be understood by those skilled in the art through the research and practice of the present application. Description of the Drawings

[0040] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to limit this specification. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0041] Figure 1 It is a flowchart of a method for controlling the depth of surface pitting of the strip during the production of DP steel provided by an embodiment of the present application;

[0042] Figure 2System functional module diagram for controlling the depth of surface pitting of strip steel during the production of DP steel provided by an embodiment of the present application;

[0043] Figure 3 Schematic structural diagram of an electronic device for controlling the depth of surface pitting of strip steel during the production of DP steel provided by an embodiment of the present application. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the accompanying drawings in the present application are only for the purposes of illustration and description, and are not used to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without a logical context relationship may be reversed or implemented simultaneously. In addition, those skilled in the art may add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present application.

[0045] In addition, the described embodiments are only some embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and illustrated in the accompanying drawings here may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts fall within the protection scope of the present application.

[0046] In this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element. The term "more than two" includes two or more than two.

[0047] At present, when producing DP steel on the continuous annealing production line, the continuous annealing line undergoes two alkali washes + two brush washes + electrolysis + rinsing. The cleaning section of cold rolling is before the loop, and affected by welding, the speed fluctuates greatly. Currently, the main index for detecting cleaning quality is the reflectivity. When the pitting is relatively deep, through the existing pulling steel control mini-program, the pulling steel control of the furnace rolls in a section can be carried out. The control principle is: change the roll diameter of the furnace roll (the physical object remains unchanged), make the strip and the furnace roll have a speed difference (7-9%), and achieve the removal of the nodule substances on the furnace roll.

[0048] The direct cause of pitting in the furnace is usually caused by foreign substances adhering to the furnace rolls. The pitting defects on the strip surface unique to the continuous annealing unit lead to the nodule phenomenon on the surface of the furnace rolls unique to the continuous annealing unit. When producing high-strength steel in continuous annealing, the dew point in the annealing furnace is -50°C, and the external oxidation of Si and Mn elements on the strip surface is serious. As a result, multiple irregular indentations (black dots) without a tactile sensation begin to appear on the upper surface of the continuous annealing strip, mainly distributed in the middle part of the upper surface of the strip on the operation side. As production progresses, black dots also begin to appear on the lower surface, located in the middle part of the lower surface of the strip. The depth of the pitting defect exceeds the standard and cannot meet the requirements of the strip surface.

[0049] This application provides a method for controlling the depth of pitting on the surface of the strip during the production of DP steel, which can effectively control the depth and density of pitting in the furnace and solve the problem of strip surface quality.

[0050] Please refer to Figure 1 , which is a flowchart of a method for controlling the depth of pitting on the surface of the strip during the production of DP steel provided by an embodiment of this application. Specifically, it can include:

[0051] S110. Pre-treat and detect and adjust the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pitting on the strip surface.

[0052] Exemplarily, before production, the three tanks in the inlet cleaning section discharge waste one hour in advance, check whether the magnetic filtration is normal, and adjust the brush roll current from 4.5 to 5.0 to improve the cleaning quality. Before production, the airtightness of each area of the industrial furnace is detected, and the radiant tubes on-site are adjusted through waste gas analysis to ensure the normal furnace atmosphere.

[0053] S120. Adjust the tension applied to the strip in the target area of the industrial furnace to control the generation of pitting on the strip surface, where the target area is the third partition of the heating zone, the soaking zone, and the rapid cooling zone, and the strip is made of DP steel.

[0054] For example, during the heat treatment of the strip, the strip will run in the furnace driven by the furnace rollers. There is a certain adhesion between the strip and the furnace rollers. When the adhesion is too large, the surface of the strip may be damaged during the contact with the furnace rollers, resulting in defects such as pitting. Reducing the tension of the third sub-zone, the equalization zone, and the rapid cooling zone of the heating zone by about -10% can make the strip more relaxed when running in the furnace, reduce the pressure between the strip and the furnace rollers, and thus reduce the adhesion between the two. This can avoid the adverse effects on the surface quality of the strip caused by excessive friction and adhesion between the strip and the furnace rollers, and effectively control the generation of pitting.

[0055] S130, reducing the fan power in the rapid cooling zone within a preset range to control the depth of pitting on the surface of the strip.

[0056] Exemplarily, the fan in the rapid cooling zone is mainly used to accelerate the cooling rate of the strip to meet the production process requirements of DP steel. However, when the fan is running at full load, it will produce large airflow disturbances. This drastic change in airflow may destroy the originally stable atmosphere distribution in the furnace. The instability of the atmosphere in the furnace may cause uneven oxidation, reduction and other reactions on the surface of the strip, thereby affecting the surface quality of the strip and increasing the probability of pitting. Reducing the fan power in the three zones in the rapid cooling zone by 5%-10% to a load of about 85% can not only ensure that the cooling rate of the strip meets the process requirements, but also reduce the adverse effects of the high-power operation of the fan on the atmosphere in the furnace, maintain the stability of the atmosphere in the furnace, and help control the depth of pitting on the surface of the strip.

[0057] S140, setting the pressure in the industrial furnace according to the preset value, opening the heat dissipation of the third partition of the heating area, and opening the outlet seal purge to keep the atmosphere in the industrial furnace balanced.

[0058] For example, a suitable furnace pressure is very important for maintaining a stable furnace atmosphere and normal processing of the strip. Setting the furnace pressure to 1.5 (the unit may be determined according to actual conditions, such as Pa, kPa, etc.) can ensure that the furnace atmosphere remains balanced.

[0059] In some examples, the atmosphere is the composition, proportion, and corresponding gas environment state of the gas in an industrial furnace.

[0060] S150. Adjust the temperature and humidity of the industrial furnace and the entrance cleaning section before the strip enters the production process.

[0061] Exemplarily, start the steam tracing in the furnace area in advance to increase the cleaning temperature in the cleaning section to around 120°C. Humidification is set at (36 - 38%) two hours in advance in the industrial furnace area. Keep the dew point of the strip in the heating section at around -30°C to cause internal oxidation of the strip, prevent the precipitation of easily oxidizable elements on the strip surface, and avoid the formation of many black dot-like pockmarks on the surface. The purpose is to form a protective film to reduce the precipitation of the strip.

[0062] S160. Based on the adjusted industrial furnace and DP steel production line, control the depth of pockmarks on the strip surface during the production of DP steel.

[0063] Exemplarily, after the adjustment is completed, start the roll grinding in the heating zone to control the depth of pockmarks on the strip surface during the production of DP steel.

[0064] In some examples, pre-treat and detect and adjust the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pockmarks on the strip surface, including:

[0065] Clean and inspect the inlet cleaning section of the DP steel production line to reduce the generation of pockmarks on the strip surface;

[0066] Detect the airtightness of each area in the industrial furnace and adjust the radiant tubes in the furnace area based on the waste gas analysis results.

[0067] In some examples, clean and inspect the inlet cleaning section of the DP steel production line to reduce the generation of pockmarks on the strip surface, including:

[0068] One hour before the strip enters the production process, discharge the waste from the tanks in the inlet cleaning section;

[0069] Check whether the magnetic filtration is normal;

[0070] Adjust the brush roll current according to the target current value.

[0071] Exemplarily, discharge the waste from the three tanks in the inlet cleaning section one hour in advance because the tanks in the inlet cleaning section will accumulate impurities, oil stains and other pollutants during the production process. Discharging the waste one hour in advance can remove these accumulated pollutants and prevent them from causing secondary pollution to the strip surface in subsequent production, providing good basic conditions for the high-quality cleaning of the subsequent strip.

[0072] When checking whether the magnetic filtration is normal, use the magnetic filtration device to remove the magnetic impurities in the cleaning liquid. If the magnetic filtration is not normal, the magnetic impurities may remain in the cleaning liquid and adhere to the strip surface during the strip cleaning process, affecting the cleaning effect and the strip surface quality. Checking the normal operation of the magnetic filtration can ensure that the cleaning liquid remains clean and improve the effectiveness of the cleaning.

[0073] Adjust the brush roll current from 4.5 to 5.0 according to the target current value to improve the cleaning quality. The brush roll contacts the strip surface through rotation during the cleaning process to remove surface dirt. Increasing the brush roll current can change the rotational speed or pressure of the brush roll (specifically depending on the working principle of the brush roll motor), enhancing the frictional force and removal ability of the brush roll on the dirt on the strip surface, thereby improving the cleaning quality, reducing the impurities remaining on the strip surface, and reducing the possibility of pitting.

[0074] Exemplarily, detect the airtightness of each area in the industrial furnace before production. The airtightness of each area in the furnace is crucial for the stability of the furnace atmosphere. If there are leaks in each area of the furnace, outside air may enter the furnace, changing the gas composition and pressure inside the furnace and affecting the heating and processing of the strip. Through airtightness detection, leakage points can be discovered and repaired in a timely manner to ensure that the furnace atmosphere is not interfered by the outside world, providing a guarantee for the stable heat treatment of the strip.

[0075] In some examples, adjust the radiant tubes in the furnace area according to the exhaust gas analysis results, including:

[0076] Monitor the exhaust gas composition generated by combustion in the industrial furnace in real time to obtain the exhaust gas analysis results;

[0077] Adjust the combustion of the radiant tubes according to the exhaust gas analysis results so that the proportions of various gases in the furnace atmosphere meet the requirements of strip heat treatment.

[0078] Exemplarily, ensure the normal furnace atmosphere through on-site adjustment of the radiant tubes based on exhaust gas analysis: Exhaust gas analysis can monitor the exhaust gas composition generated by combustion in the furnace in real time, such as the contents of gases such as carbon monoxide, carbon dioxide, and hydrogen. According to the exhaust gas analysis results, the combustion of the on-site radiant tubes can be adjusted, for example, adjusting parameters such as gas flow rate and air flow rate, making the combustion process in the furnace more stable, and ensuring that the proportions of various gases in the furnace atmosphere meet the requirements of the strip heat treatment process. A suitable furnace atmosphere helps control the oxidation degree and other chemical reactions of the strip, preventing defects such as pitting on the strip surface due to abnormal atmosphere.

[0079] In some examples, before the strip enters the production process, adjust the temperature and humidity of the industrial furnace and the inlet cleaning section, including:

[0080] Before the strip enters the production process, turn on the steam tracing in the industrial furnace and raise the cleaning temperature of the inlet cleaning section to the preset temperature;

[0081] Two hours before the strip enters the production process, adjust the humidity in the industrial furnace according to the target value so that the dew point of the strip in the heating zone is within the target range.

[0082] Exemplarily, turn on the steam tracing in the industrial furnace in advance, raise the cleaning temperature of the cleaning section to reach the preset temperature, that is, about 120 degrees.

[0083] The reason for turning on the steam heating in the industrial furnace in advance and raising the cleaning temperature of the cleaning section to about 120 degrees is that temperature has an important influence on the cleaning effect. Within a certain range, increasing the temperature can enhance the activity and solubility of the cleaning agent, so that the cleaning agent can better react chemically with impurities and oil stains on the surface of the strip and dissolve and peel them off. Higher temperatures can also make the cleaning liquid more fluid and contact the surface of the strip more evenly, thereby more effectively removing dirt on the surface of the strip, further improving the cleaning quality, and reducing the possibility of pitting due to residual impurities.

[0084] Humidification is set within the target value (36-38%) two hours in advance. The dew point of the strip in the heating section is about -30℃, so that the strip is internally oxidized, and the oxidizable elements on the surface of the strip are prevented from precipitating, and more black spots are produced on the surface. The purpose is to form a protective film to reduce the precipitation of the strip. Humidification is set at 36-38% two hours in advance, so that the dew point of the strip in the heating section reaches about -30℃, in order to promote the internal oxidation of the strip, prevent the oxidizable elements on the surface of the strip, and produce more black spots on the surface. The purpose is to form a protective film to reduce the precipitation of the strip. Some elements in the strip will undergo internal oxidation reaction under specific temperature and humidity conditions to form a relatively stable oxide film. When the humidity and dew point of the furnace area are controlled within the appropriate range, oxidation reaction occurs preferentially inside and on the subsurface of the strip, rather than on the surface of the strip. This can prevent the oxidizable elements on the surface of the strip from precipitating and oxidizing to the surface during the subsequent heating process, and avoid the appearance of more black spots on the surface of the strip. This protective film formed by internal oxidation can hinder the diffusion and migration of easily oxidizable elements, thereby reducing the occurrence of pitting caused by oxidation of these elements on the strip surface and improving the surface quality of the strip.

[0085] In some examples, the depth of pits on the surface of the strip steel is controlled during the DP steel production process based on the adjusted industrial furnace and DP steel production line, including:

[0086] Based on the adjusted industrial furnace and DP steel production line, the grinding rollers are turned on in the heating zone to control the depth of pitting on the strip surface during DP steel production.

[0087] Exemplarily, after the adjustment is completed and the switching specifications are adjusted, the grinding roller is turned on in the heating zone.

[0088] In summary, in the method for controlling the pitting depth of the strip surface during the production of DP steel proposed in this application, key parameters such as the dew point and oxygen content in the annealing furnace are adjusted, and external oxidation is transformed into internal oxidation in the heating section of the furnace, achieving the purpose of inhibiting alloying elements. The pitting depth and density of the strip surface can be controlled in the furnace to meet the required standards of customers for the product. The problem that the depth of large-area pitting defects on the strip surface exceeds the standard is avoided. The problems such as the extremely difficult treatment due to the sealing, high temperature, and high-speed operation of the annealing furnace equipment are solved. It is easy to operate and has strong popularization value and application prospects. In addition, this method is simple to operate and convenient and fast to process.

[0089] It should be noted that the above embodiments are only the best examples and do not limit the implementation modes of this application.

[0090] Based on the same inventive concept, in the embodiments of this application, a system for controlling the pitting depth of the strip surface during the production of DP steel corresponding to the method for controlling the pitting depth of the strip surface during the production of DP steel provided in the above embodiments is also provided. Since the principle of solving problems by the system for controlling the pitting depth of the strip surface during the production of DP steel in the embodiments of this application is similar to that of the method for controlling the pitting depth of the strip surface during the production of DP steel in the above embodiments of this application, the implementation of the system can refer to the implementation of the method, and the repeated parts will not be described again.

[0091] As Figure 2 shown, Figure 2 is a functional module diagram of a system for controlling the pitting depth of the strip surface during the production of DP steel provided by this application. The system includes:

[0092] A cleaning and detection unit 21, which is used for preprocessing, detecting and adjusting the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pitting on the strip surface;

[0093] A tension adjustment unit 22, which is used for adjusting the tension applied to the strip in the target area of the industrial furnace to control the generation of pitting on the strip surface. The target area is the third partition of the heating zone, the soaking zone, and the rapid cooling zone, and the strip is made of DP steel;

[0094] A power adjustment unit 23, which is used for reducing the fan power in the rapid cooling zone within a preset range to control the pitting depth of the strip surface;

[0095] A pressure adjustment unit 24, which is used for setting the pressure in the industrial furnace according to a preset value, opening the heat dissipation of the third partition of the heating area, and opening the outlet seal purge to keep the atmosphere in the industrial furnace balanced;

[0096] A temperature and humidity adjustment unit 25, which is used for adjusting the temperature and humidity of the industrial furnace and the inlet cleaning section before the strip enters the production process;

[0097] A production control unit 26 for controlling the depth of pitting on the strip surface during DP steel production based on the adjusted industrial furnace and DP steel production line.

[0098] In summary, the system for controlling the depth of pitting on the strip surface during DP steel production provided by this application adjusts key parameters such as the dew point and oxygen content in the annealing furnace, converts external oxidation to internal oxidation in the heating section of the furnace, and achieves the purpose of inhibiting alloy elements. It can control the depth and density of pitting on the strip surface in the industrial furnace, meet the customer's required product standards, avoid the problem that the depth of large-area pitting defects on the strip surface exceeds the standard, and solve the problems such as the extremely difficult treatment due to the sealing, high temperature, and high-speed operation of the annealing furnace equipment. It is easy to operate and has strong promotion value and application prospects. In addition, this method is simple to operate and convenient and fast to process.

[0099] As Figure 3 shown, based on the same inventive concept, the embodiment of this application also provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored on the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, it implements the steps of any of the above methods for controlling the depth of pitting on the strip surface during DP steel production.

[0100] Since the electronic device introduced in this embodiment is the device used to implement a method for controlling the depth of pitting on the strip surface during DP steel production in the embodiment of this application, based on the method introduced in the embodiment of this application, those skilled in the art can understand the specific implementation manner and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device implements the method in the embodiment of this application will not be described in detail here. As long as it is the device used by those skilled in the art to implement the method in the embodiment of this application, it falls within the scope of protection of this application.

[0101] Those skilled in the art should understand that the embodiments of this application can be provided as a method, a system, or a computer program product. Therefore, this application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0102] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded computers, or other programmable data processing devices to generate a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices produce means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or in multiple blocks.

[0103] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or in multiple blocks.

[0104] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or in multiple blocks.

[0105] Embodiments of the present application also provide a computer program product that includes computer software instructions. When the computer software instructions run on a processing device, the processing device is caused to execute the method flow for controlling the depth of surface pitting of strip steel during the production of DP steel in the corresponding embodiment.

[0106] A computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from a website, a computer, a server, or a data center to another website, a computer, a server, or a data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0107] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and modules can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0108] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules is only a logical function division, and there may be other division methods in actual implementation. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other may be indirect couplings or communication connections through some interfaces, devices, or units, and may be in electrical, mechanical, or other forms.

[0109] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0110] In addition, in each embodiment of the present application, each functional module can be integrated into one processing module, or each module can exist physically alone, or two or more modules can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module.

[0111] If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0112] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A method for controlling the depth of pitting on the strip surface during the production of DP steel, characterized in that Including: Pre-treating and detecting and adjusting the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pitting on the strip surface; Adjusting the tension applied to the strip within the target area of the industrial furnace to control the generation of pitting on the strip surface, where the target area is the third partition of the heating zone, the soaking zone, and the rapid cooling zone, and the strip is made of DP steel; Reducing the fan power within the rapid cooling zone to a preset range to control the depth of pitting on the strip surface; Setting the pressure inside the industrial furnace according to a preset value, opening the heat dissipation of the third partition of the heating area, and starting the outlet seal purge to keep the atmosphere inside the industrial furnace balanced; Adjusting the temperature and humidity of the industrial furnace and the inlet cleaning section before the strip enters the production process; Based on the adjusted industrial furnace and the DP steel production line, controlling the depth of pitting on the strip surface during the DP steel production process.

2. The method for controlling the pitting depth on the strip surface during the production of DP steel according to claim 1, characterized in that The pre-treating and detecting and adjusting the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pitting on the strip surface includes: Cleaning and inspecting the inlet cleaning section of the DP steel production line to reduce the generation of pitting on the strip surface; Detecting the airtightness of each area inside the industrial furnace and adjusting the radiant tubes in the furnace area according to the waste gas analysis results.

3. The method for controlling the depth of surface pitting of strip steel during the production of DP steel according to claim 2, characterized in that, The adjusting the radiant tubes in the furnace area according to the waste gas analysis results includes: Real-time monitoring the composition of the waste gas generated by combustion inside the industrial furnace to obtain the waste gas analysis results; Adjusting the combustion condition of the radiant tubes according to the waste gas analysis results so that the proportion of various gases in the atmosphere inside the industrial furnace meets the requirements of strip heat treatment.

4. The method for controlling the depth of surface pitting of strip steel during the production of DP steel according to claim 1, characterized in that, The adjusting the temperature and humidity of the industrial furnace and the inlet cleaning section before the strip enters the production process includes: Before the strip enters the production process, turning on the steam tracing inside the industrial furnace and raising the cleaning temperature of the inlet cleaning section to a preset temperature; Two hours before the strip enters the production process, adjusting the humidity inside the industrial furnace to a target value so that the dew point of the strip in the heating zone is within the target range.

5. The method for controlling the depth of surface pitting of strip steel during the production of DP steel according to claim 2, characterized in that, The cleaning and inspecting the inlet cleaning section of the DP steel production line to reduce the generation of pitting on the strip surface includes: One hour before the strip enters the production process, draining the waste from the tank of the inlet cleaning section; Checking whether the magnetic filtration is normal; Adjusting the brush roll current according to the target current value.

6. The method for controlling the depth of surface pitting of strip steel during the production of DP steel according to claim 1, characterized in that The atmosphere refers to the composition, proportion, and corresponding gas environmental state of the gas inside the industrial furnace.

7. The method for controlling the depth of surface pitting of strip steel during the production of DP steel according to claim 1, characterized in that, The controlling the depth of pitting on the strip surface during the DP steel production process based on the adjusted industrial furnace and the DP steel production line includes: Based on the adjusted industrial furnace and the DP steel production line, turning on the grinding roll in the heating zone to control the depth of pitting on the strip surface during the DP steel production process.

8. A system for controlling the depth of surface pitting of strip steel during the production of DP steel, which is applied to the method for controlling the depth of surface pitting of strip steel during the production of DP steel according to any one of claims 1 to 7 above, characterized in that, Including: A cleaning and detection unit for pre-treating and detecting and adjusting the inlet cleaning section and the industrial furnace of the DP steel production line to reduce the generation of pitting on the strip surface; Tension adjustment unit, used to adjust the tension of the strip in the target area of the industrial furnace to control the generation of surface pitting of the strip. Wherein, the target area is the third partition of the heating zone, the soaking zone and the rapid cooling zone, and the strip is made of DP steel; Power adjustment unit, used to reduce the fan power in the rapid cooling zone within a preset range to control the depth of surface pitting of the strip; Pressure adjustment unit, used to set the pressure in the industrial furnace according to a preset value, open the heat dissipation of the third partition of the heating area, and turn on the outlet seal purge to keep the atmosphere in the industrial furnace balanced; Temperature and humidity adjustment unit, used to adjust the temperature and humidity of the industrial furnace and the inlet cleaning section before the strip enters the production process; Production control unit, used to control the depth of surface pitting of the strip during the production of DP steel based on the adjusted industrial furnace and the DP steel production line; 9. An electronic device, comprising: Memory and processor, characterized in that the processor is used to implement the steps of the method for controlling the depth of surface pitting of the strip during the production of DP steel as described in any one of claims 1 to 7 when executing the computer program stored in the memory; 10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program, when executed by the processor, implements the steps of the method for controlling the depth of surface pitting of the strip during the production of DP steel as described in any one of claims 1 to 7.

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