A method for rolling and preparing a corrosion-prevention performance steel bar based on a multi-dimension rolling process control

Abstract

The application discloses a kind of based on multi-dimension rolling process control's anti-rust performance reinforcing steel rolling preparation method, mainly related to reinforcing steel rolling field. Including S1, the billet needing to be rolled is carried out high-pressure water descaling operation, the original mill scale existing on the surface of billet is removed, to ensure that the surface of billet is clean and clean;S2, the billet after pretreatment is sent into heating furnace, the temperature of heating furnace is controlled by integrated control system, so that billet is heated with normal distribution temperature function image processing, while the temperature of furnace body is monitored, and the real-time center edge temperature function image of furnace body inside is obtained.The beneficial effects of the present application are that: it can ensure that the structure of the steel surface oxide scale produced is stable, and the problem of cracking and damage will not easily occur, thereby ensuring that the reinforcing steel will not rust during storage and transportation, so that the reinforcing steel can better function in the building to maximize the mechanical properties of reinforcing steel.

Description

Technical Field

[0001] This invention relates to the field of steel bar rolling methods, specifically a method for preparing rust-resistant steel bars based on multi-dimensional rolling process control. Background Technology

[0002] As a core structural material in the construction engineering field, reinforcing steel is widely used in housing construction, bridges, tunnels, rail transit, and large-scale infrastructure projects. Its service durability directly determines the structural safety and service life. During the hot-rolled steel bar production process, iron oxide scale inevitably forms on the surface of the steel bars under high-temperature conditions. The microstructure, density, bonding strength, and phase composition of this oxide layer are key factors determining the steel bar's rust resistance. Steel bars produced by traditional hot-rolling processes generally have defects in their surface iron oxide scale, such as loose structure, coarse grains, uneven thickness, and weak interfacial bonding. During rolling, cooling, and handling, it is prone to peeling, cracking, and detachment. This type of oxide layer cannot effectively prevent corrosive media such as oxygen, water vapor, and chloride ions in the atmosphere from contacting the steel bar matrix, making the steel bars extremely susceptible to corrosion during storage, transportation, open-air stacking, and on-site construction. Corrosion not only severely degrades the appearance quality of the steel bars but also weakens their mechanical properties, reduces the bond strength and anchorage performance between the steel bars and concrete, thereby affecting the overall safety and durability of the structure.

[0003] In current industrial production, rust prevention of reinforcing steel mainly relies on subsequent additional treatments such as oiling, galvanizing, and passivation. These processes not only significantly increase production costs and process complexity but also easily generate pollutants such as volatile organic compounds, heavy metal ions, and acidic / alkaline waste liquids, contradicting the industry's development direction of green building materials, low-carbon manufacturing, and clean production. While existing publicly available technologies focus on research related to iron oxide scale on the surface of reinforcing steel, they largely concentrate on the mechanical removal, acid pickling, or simple thickness control of the scale. They fail to achieve precise and coordinated control of the oxide layer's density, phase composition, surface color, and bonding strength, making it difficult to form a uniform, dense, stable, and aesthetically pleasing bluish-green protective oxide film on the reinforcing steel surface.

[0004] Therefore, based on the above problems, a method for preparing anti-corrosion steel bars based on multi-dimensional rolling process control is proposed. This method can ensure that the iron oxide scale structure on the surface of the produced steel bars is stable and will not easily crack or break. This ensures that the steel bars will not rust during storage and transportation, thus enabling the steel bars to be better used in construction and to maximize their mechanical properties. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing anti-corrosion steel bars based on multi-dimensional rolling process control. This method can ensure that the iron oxide scale structure on the surface of the steel bars is stable and will not easily crack or break. This ensures that the steel bars will not rust during storage and transportation, thus enabling the steel bars to be better used in construction and to maximize their mechanical properties.

[0006] To achieve the above objectives, the present invention employs the following technical solution: A method for preparing corrosion-resistant steel bars based on multi-dimensional rolling process control includes the following steps: S1, High-pressure water descaling is performed on the steel billet that needs to be rolled to remove the original iron oxide scale on the surface of the steel billet and ensure that the surface of the steel billet is clean. S2, the pre-treated steel billet is sent into the heating furnace, and the temperature of the heating furnace is controlled by the integrated control system so that the steel billet is heated with a normal temperature function image. At the same time, the furnace body temperature is monitored and a real-time center-edge temperature function image inside the furnace body is obtained. S3, based on the obtained real-time center and edge temperature function image inside the furnace, make a judgment and adjust the heating index of the heating equipment at each position inside the furnace in real time so that the temperature difference between the center and edge positions inside the furnace is within the specified range. S4. After the billet is heated, the billet is transported as a whole to the rolling line. When the billet comes into contact with the conveyor rollers on the rolling line, the length of the billet on the conveyor rollers is calculated by the number of rotations of the conveyor rollers, and the calculation data is transmitted to the integrated control system. S5. When the integrated control system receives the length information of the billet, it judges the temperature difference between the initial end and the final end of the billet during the rolling process based on the cooling function curve of the billet at room temperature. S6 transmits the temperature difference between the initial and final billet to the integrated control system. The integrated control system calculates and determines the magnitude of the force required to roll billets at different temperatures and plots the billet temperature versus force function graph. S7, the integrated control system transmits the data of the required rolling force at different temperatures to the extrusion end of the rolls, so that the extrusion end of the rolls applies different forces to different positions of the billet at different temperatures to perform extrusion rolling operations until the overall rolling of the billet is completed. S8 involves repeatedly rolling the billet under different temperatures and with different forces, enabling the billet to complete the multi-step rolling process from roughing to finishing, thereby completing the rolling of the billet.

[0007] The heating method for the normal distribution temperature function image in step S2 includes a preheating section, a heating section, and a homogenization section. S21. When the billet enters the furnace, the various parts of the furnace are slowly heated so that the temperature rises slowly to the billet preheating section and is maintained for a certain period of time to avoid the billet from heating up too quickly and generating thermal stress. S22, based on the real-time center and edge temperature function image inside the furnace body, the difference between the center temperature and the edge temperature of the furnace body is calculated, so that the difference between the center temperature and the edge temperature of the furnace body is kept stable while the furnace body is heated, so that the billet enters the billet heating section and is held for a certain period of time. S23: After the billet has been in the heating section for a certain period of time, the temperature inside the furnace is reduced so that the billet enters the billet soaking section, and the furnace atmosphere is controlled to a weak oxidizing atmosphere until the billet reaches the tapping time.

[0008] The real-time center-edge temperature function image inside the furnace body in step S2 is established according to the following temperature distribution function:

[0009] in, This represents the real-time temperature at the lateral position of the furnace body. Temperature at the center of the furnace body. Temperature at the edge of the furnace body. The center position of the furnace body The temperature diffusion distribution coefficient; The integrated control system is based on the temperature at the center of the furnace body. Temperature at the edge of the furnace body Calculate the temperature difference between the center and the edge:

[0010] When the temperature difference ΔT at the center edge exceeds the preset temperature difference range, the integrated control system sends an adjustment command to the heating device at the corresponding location.

[0011] The calculation formula for the billet length in step S4, based on the number of rotations of the conveyor rollers, is as follows:

[0012] in, The length of the steel billet. The number of rotations of the conveyor roller. The diameter of the conveyor roller, This is a conveying correction factor; when slippage between the conveying rollers and the billet is not considered, the conveying correction factor is... The value is 1; when there is slippage between the conveying roller and the steel billet, the conveying correction coefficient is... Less than 1; The integrated control system is based on the billet length and conveying speed Calculate the time difference between the initial and final ends of the billet entering the rolling zone: The time difference is used as the input parameter for calculating the temperature difference between the beginning and end of the billet.

[0013] In step S5, the billet cooling function curve at room temperature is established according to the following cooling function:

[0014] in, After cooling time The final billet temperature, For ambient temperature, The initial temperature of the steel billet. The coefficient of performance is the cooling factor. The temperature distribution function at position x along the length of the steel billet is:

[0015] Where t0 is the exposure time of the initial end of the billet before it enters the rolling line, and v is the conveying speed; The integrated control system calculates the initial temperature Tinitial and the final temperature Tfinal of the billet based on the temperature distribution function, and obtains the temperature difference between the initial and final ends of the billet. in, This represents the temperature difference between the beginning and end of the billet along its length.

[0016] In step S6, the functional relationship between the billet temperature and the rolling force is as follows: in, The billet temperature is The rolling force required at that time Reference temperature The rolling force below, For reference temperature, This refers to the temperature sensitivity coefficient. The integrated control system substitutes the temperature distribution function along the length of the billet into the functional relationship between the billet temperature and the rolling force to obtain the rolling force compensation function along the length of the billet:

[0017] in, Position along the length of the steel billet The rolling force required at the point; When the temperature at a certain position along the length of the billet decreases, the integrated control system controls the extrusion end of the rolls to increase the rolling force corresponding to that position; when the temperature at a certain position along the length of the billet increases, the integrated control system controls the extrusion end of the rolls to decrease the rolling force corresponding to that position.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention establishes a furnace body center-edge temperature function image and adjusts the heating index of each heating zone in real time according to the temperature difference between the furnace body center temperature and edge temperature. This can reduce the impact of uneven temperature distribution inside the furnace body on the billet structure and surface oxidation state, and reduce problems such as local overheating and underheating of the billet and the resulting surface cracks and uneven oxide scale thickness.

[0019] 2. This invention calculates the billet length by measuring the number of rotations of the conveying rollers, and calculates the temperature difference between the initial and final ends of the billet by combining the conveying speed and cooling function. This allows for accurate determination of the temperature distribution along the length of the billet during conveying and rolling, providing a data basis for subsequent adjustment of rolling force at different positions.

[0020] 3. By establishing a functional relationship between billet temperature and rolling force, this invention enables the extrusion end of the rolls to apply different rolling forces according to the temperature state of different positions of the billet, thereby reducing problems such as insufficient deformation in the low-temperature section, excessive extrusion in the high-temperature section, damage to the surface oxide layer, and dimensional fluctuations caused by constant rolling force. Attached Figure Description

[0021] Appendix Figure 1 This is a schematic diagram of the process of this invention.

[0022] Appendix Figure 2 This is a graph of the temperature function from the center to the edge of the furnace body in this invention.

[0023] Appendix Figure 3 This is a graph of the cooling function of a steel billet at room temperature in this invention.

[0024] Appendix Figure 4 This is a graph of the temperature distribution function of the steel billet along its length in this invention.

[0025] Appendix Figure 5 This is a graph of the force function of billet temperature rolling in this invention. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0027] A method for preparing corrosion-resistant steel bars based on multi-dimensional rolling process control includes the following steps: S1 involves a high-pressure water descaling operation on the steel billet to be rolled, removing the original iron oxide scale from its surface to ensure a clean billet surface. Before entering the heating furnace or rolling line, the billet surface is typically covered with original iron oxide scale, a loose oxide layer, and localized impurities. If these surface deposits are not effectively removed, they can easily form uneven secondary oxide layers during subsequent heating. These layers can then be pressed into the steel reinforcement surface or crack, peel, and detach during rolling, thus forming rust initiation points. Therefore, high-pressure water descaling is performed here to avoid the impact of excessive iron oxide scale on the billet surface on the normal rolling process.

[0028] S2, the pre-treated steel billet is sent into the heating furnace, and the temperature of the heating furnace is controlled by the integrated control system so that the steel billet is heated with a normal temperature function image. At the same time, the furnace body temperature is monitored and a real-time center-edge temperature function image inside the furnace body is obtained. S3, based on the obtained real-time center and edge temperature function image inside the furnace, make a judgment and adjust the heating index of the heating equipment at each position inside the furnace in real time so that the temperature difference between the center and edge positions inside the furnace is within the specified range. When steel billets are heated in a furnace, a temperature difference typically exists between the central and peripheral areas of the furnace. If the temperature distribution within the furnace is uneven, different parts of the billet will experience varying degrees of heating, leading to differences in the billet's internal structure, surface oxide layer thickness, and deformation resistance. Traditional furnace temperature control often relies on the overall furnace temperature or a single point temperature, which fails to reflect the real-time temperature distribution across different transverse locations within the furnace, easily resulting in localized overheating, underheating, or insufficient heat uniformity. Localized overheating exacerbates surface oxidation of the billet, while localized underheating increases rolling deformation resistance; both negatively impact the surface quality and rust resistance of the finished steel reinforcement.

[0029] In this step, the heating method of the normal distribution temperature function image in step S2 includes a preheating section, a heating section, and a homogenization section; S21. When the billet enters the furnace, the various parts of the furnace are slowly heated so that the temperature rises slowly to the billet preheating section and is maintained for a certain period of time to avoid the billet from heating up too quickly and generating thermal stress. S22, based on the real-time center and edge temperature function image inside the furnace body, the difference between the center temperature and the edge temperature of the furnace body is calculated, so that the difference between the center temperature and the edge temperature of the furnace body is kept stable while the furnace body is heated, so that the billet enters the billet heating section and is held for a certain period of time. S23: After the billet has been in the heating section for a certain period of time, the temperature inside the furnace is reduced so that the billet enters the billet soaking section, and the furnace atmosphere is controlled to a weak oxidizing atmosphere until the billet reaches the tapping time.

[0030] Specifically, the preheating section maintains a temperature of 650-950℃ and a holding time of 15-20 minutes to prevent rapid heating of the billet and the generation of thermal stress. The heating section raises the temperature to 1100-1180℃ and holds for 30-40 minutes to ensure uniform billet temperature with a core-to-surface temperature difference of ≤30℃. The soaking section stabilizes the temperature at 1080-1150℃ and holds for 10-15 minutes. The furnace atmosphere is controlled as a weakly oxidizing atmosphere with an excess air coefficient of 1.05-1.10 to reduce excessive oxidation of the billet and prevent the formation of loose iron oxide scale.

[0031] Meanwhile, the real-time center-edge temperature function image inside the furnace body in step S2 is established according to the following temperature distribution function:

[0032] in, The horizontal position of the furnace body Real-time temperature at the location, Temperature at the center of the furnace body. Temperature at the edge of the furnace body. The center position of the furnace body The temperature diffusion distribution coefficient; The integrated control system calculates the temperature difference between the center and edge of the furnace body based on the temperature Tc at the center and the temperature Te at the edge. When the temperature difference ΔT between the center and edge exceeds the preset temperature difference range, the integrated control system sends an adjustment command to the heating equipment at the corresponding location. Through the above settings, the internal temperature distribution of the furnace can be transformed from traditional empirical judgment to function graph judgment, enabling the integrated control system to intuitively identify the temperature deviation between the central and edge regions of the furnace. The preheating section reduces the thermal stress caused by rapid heating of the billet; the heating section ensures that the billet reaches the temperature required for rolling; and the soaking section improves the overall temperature uniformity of the billet. Weak oxidizing atmosphere control also avoids excessive oxidation of the billet surface, which is beneficial for forming a more uniform and stable surface oxide protective layer.

[0033] S4. After the billet is heated, the billet is transported as a whole to the rolling line. When the billet comes into contact with the conveyor rollers on the rolling line, the length of the billet on the conveyor rollers is calculated by the number of rotations of the conveyor rollers, and the calculation data is transmitted to the integrated control system. When a steel billet enters the rolling line after exiting the heating furnace, its initial end enters the rolling zone first, followed by its final end. For longer billets, there is a significant time difference between the initial and final ends entering the same rolling position. Because the billet continuously dissipates heat during transport, this time difference leads to temperature variations between the initial and final ends. Traditional rolling control often ignores the impact of billet length on the temperature difference between the beginning and end, or relies solely on manual experience to estimate temperature drop, making it difficult to accurately determine the temperature state of the billet at different positions entering the rolling zone.

[0034] Therefore, after the billet is heated, the billet is transported as a whole to the rolling line. When the billet comes into contact with the conveyor rollers on the rolling line, the length of the billet on the conveyor rollers is calculated by the number of rotations of the conveyor rollers, and the calculated data is transmitted to the integrated control system.

[0035] The formula for calculating the billet length based on the number of rotations of the conveyor rollers is as follows:

[0036] Where L is the length of the steel billet, N is the number of rotations of the conveyor roller, and D is the diameter of the conveyor roller. This is a conveying correction factor; when slippage between the conveying rollers and the billet is not considered, the conveying correction factor is... The value is 1; when there is slippage between the conveying roller and the steel billet, the conveying correction coefficient is... Less than 1; The integrated control system calculates the time difference between the initial and final ends of the billet entering the rolling zone based on the billet length L and conveying speed v.

[0037] The time difference is used as the input parameter for calculating the temperature difference between the beginning and end of the billet.

[0038] With the above settings, the billet length can be calculated using the rotation information of the conveyor rollers themselves, eliminating the need for additional complex length measuring equipment. After calculating the time difference between the first and last ends based on the conveying speed, the integrated control system can further calculate the temperature drop difference between the first and last ends of the billet, providing an accurate basis for subsequent temperature compensation and rolling force compensation. This step can reduce rolling control errors caused by differences in billet length and conveying speed.

[0039] S5. When the integrated control system receives the length information of the billet, it judges the temperature difference between the initial end and the final end of the billet during the rolling process based on the cooling function curve of the billet at room temperature. After the integrated control system receives the length information of the billet, it determines the temperature difference between the initial and final ends of the billet during the rolling process based on the billet cooling function curve at room temperature.

[0040] The cooling function curve of the steel billet at room temperature is established according to the following cooling function:

[0041] in, The temperature of the steel billet after cooling time t. For ambient temperature, The initial temperature of the steel billet is given by k, where k is the cooling coefficient. The temperature distribution function at position x along the length of the steel billet is:

[0042] in, The initial exposure time of the steel billet before it enters the rolling line is denoted by v, and the conveying speed is denoted by v. The integrated control system calculates the initial temperature Tinitial and the final temperature Tfinal of the billet based on the temperature distribution function, and obtains the temperature difference between the initial and final ends of the billet.

[0043] in, This represents the temperature difference between the beginning and end of the billet along its length. Following this step, different positions on the billet require different magnitudes of rolling force to establish the relationship between the billet rolling temperature and the rolling force.

[0044] S6 transmits the temperature difference between the initial and final billet to the integrated control system. The integrated control system calculates and determines the magnitude of the force required to roll billets at different temperatures and plots the billet temperature versus force function graph. S7, the integrated control system transmits the data of the required rolling force at different temperatures to the extrusion end of the rolls, so that the extrusion end of the rolls applies different forces to different positions of the billet at different temperatures to perform extrusion rolling operations until the overall rolling of the billet is completed. The temperature of the steel billet directly affects its deformation resistance. Generally, the higher the billet temperature, the better its plasticity, the lower its deformation resistance, and the less rolling force is required; conversely, the lower the billet temperature, the greater its deformation resistance and the greater the rolling force required. If a fixed force or fixed roll gap is used for control during rolling, different deformation results will occur at different temperature locations. Low-temperature locations may experience insufficient deformation due to insufficient force, while high-temperature locations may suffer surface damage due to excessive force, thus affecting the dimensional accuracy, microstructure uniformity, and surface oxide layer integrity of the reinforcing bar.

[0045] Therefore, the temperature difference between the initial and final billet is transmitted to the integrated control system. The integrated control system calculates and determines the magnitude of the force required to roll billets at different temperatures, and plots a graph of the billet temperature versus the force function.

[0046] The functional relationship between billet temperature and rolling force is as follows:

[0047] in, The billet temperature is The rolling force required at that time Reference temperature The rolling force below, For reference temperature, This refers to the temperature sensitivity coefficient. The integrated control system substitutes the temperature distribution function along the length of the billet into the functional relationship between the billet temperature and the rolling force to obtain the rolling force compensation function along the length of the billet:

[0048] in, Position along the length of the steel billet The rolling force required at the point; When the temperature at a certain location along the length of the billet decreases, the integrated control system controls the extrusion end of the rolls to increase the rolling force corresponding to that location; conversely, when the temperature at a certain location along the length of the billet increases, the integrated control system controls the extrusion end of the rolls to decrease the rolling force corresponding to that location. Through this setup, a correspondence is established between changes in billet temperature and changes in rolling force, allowing the rolling system to no longer simply roll under a fixed pressure, but rather to match the force based on the real-time or calculated temperature at different locations on the billet. This step improves the uniformity of rolling deformation, reduces under-rolling, excessive reduction, and surface damage caused by temperature differences, and provides the rolling force conditions for forming a continuous and stable surface oxide protective layer.

[0049] S8 involves repeatedly rolling the billet under different temperatures and with different forces, enabling the billet to complete the multi-step rolling process from roughing to finishing, thereby completing the rolling of the billet.

[0050] Therefore, a method for preparing anti-corrosion steel bars based on multi-dimensional rolling process control can ensure that the iron oxide scale structure on the surface of the produced steel bars is stable and will not easily crack or break. This ensures that the steel bars will not rust during storage and transportation, thus enabling the steel bars to be better used in construction and to maximize their mechanical properties.

Claims

1. A method for preparing corrosion-resistant steel bars based on multi-dimensional rolling process control, characterized in that: Includes the following steps: S1, High-pressure water descaling is performed on the steel billet that needs to be rolled to remove the original iron oxide scale on the surface of the steel billet and ensure that the surface of the steel billet is clean. S2, the pre-treated steel billet is sent into the heating furnace, and the temperature of the heating furnace is controlled by the integrated control system so that the steel billet is heated with a normal temperature function image. At the same time, the furnace body temperature is monitored and a real-time center-edge temperature function image inside the furnace body is obtained. S3, based on the obtained real-time center and edge temperature function image inside the furnace, make a judgment and adjust the heating index of the heating equipment at each position inside the furnace in real time so that the temperature difference between the center and edge positions inside the furnace is within the specified range. S4. After the billet is heated, the billet is transported as a whole to the rolling line. When the billet comes into contact with the conveyor rollers on the rolling line, the length of the billet on the conveyor rollers is calculated by the number of rotations of the conveyor rollers, and the calculation data is transmitted to the integrated control system. S5. When the integrated control system receives the length information of the billet, it judges the temperature difference between the initial end and the final end of the billet during the rolling process based on the cooling function curve of the billet at room temperature. S6 transmits the temperature difference between the initial and final billet to the integrated control system. The integrated control system calculates and determines the magnitude of the force required to roll billets at different temperatures and plots the billet temperature versus force function graph. S7, the integrated control system transmits the data of the required rolling force at different temperatures to the extrusion end of the rolls, so that the extrusion end of the rolls applies different forces to different positions of the billet at different temperatures to perform extrusion rolling operations until the overall rolling of the billet is completed. S8, repeatedly rolling the steel billet under different temperatures and with different forces, so that the steel billet completes the multi-step rolling operation from rough rolling to finish rolling, thereby completing the rolling of the steel billet; The real-time center-edge temperature function image inside the furnace body in step S2 is established according to the following temperature distribution function: in, This represents the real-time temperature at the x-axis position of the furnace body. Temperature at the center of the furnace body. Temperature at the edge of the furnace body. The center position of the furnace body The temperature diffusion distribution coefficient; The integrated control system is based on the temperature at the center of the furnace body. Temperature at the edge of the furnace body Calculate the temperature difference between the center and the edge: When the temperature difference at the center edge When the temperature difference exceeds the preset range, the integrated control system sends an adjustment command to the heating equipment at the corresponding location; In step S6, the functional relationship between the billet temperature and the rolling force is as follows: in, The billet temperature is The rolling force required at that time Reference temperature The rolling force below, The reference temperature is β, and the temperature sensitivity coefficient is β. The integrated control system substitutes the temperature distribution function along the length of the billet into the functional relationship between the billet temperature and the rolling force to obtain the rolling force compensation function along the length of the billet: in, The rolling force required at position x along the length of the steel billet; When the temperature at a certain position along the length of the billet decreases, the integrated control system controls the extrusion end of the rolls to increase the rolling force corresponding to that position; when the temperature at a certain position along the length of the billet increases, the integrated control system controls the extrusion end of the rolls to decrease the rolling force corresponding to that position.

2. The method for preparing corrosion-resistant steel bars based on multi-dimensional rolling process control according to claim 1, characterized in that: The heating method for the normal distribution temperature function image in step S2 includes a preheating section, a heating section, and a homogenization section. S21. When the billet enters the furnace, the various parts of the furnace are slowly heated so that the temperature rises slowly to the billet preheating section and is maintained for a certain period of time to avoid the billet from heating up too quickly and generating thermal stress. S22, based on the real-time center-edge temperature function image inside the furnace body, the difference between the center temperature and the edge temperature of the furnace body is calculated, so that the difference between the center temperature and the edge temperature of the furnace body is kept stable while the furnace body is heated, so that the billet enters the billet heating section and is held for a certain period of time. S23: After the billet has been in the heating section for a certain period of time, the temperature inside the furnace is reduced so that the billet enters the billet soaking section, and the furnace atmosphere is controlled to a weak oxidizing atmosphere until the billet reaches the tapping time.

3. The method for preparing corrosion-resistant steel bars based on multi-dimensional rolling process control according to claim 1, characterized in that: The calculation formula for the billet length in step S4, based on the number of rotations of the conveyor rollers, is as follows: Where L is the length of the billet, N is the number of rotations of the conveyor roller, D is the diameter of the conveyor roller, and η is the conveying correction coefficient; when slippage between the conveyor roller and the billet is not considered, the conveying correction coefficient η is 1; when there is slippage between the conveyor roller and the billet, the conveying correction coefficient η is less than 1. The integrated control system calculates the time difference between the initial and final ends of the billet entering the rolling zone based on the billet length L and conveying speed v. The time difference is used as the input parameter for calculating the temperature difference between the beginning and end of the billet.

4. The method for preparing corrosion-resistant steel bars based on multi-dimensional rolling process control according to claim 1, characterized in that: In step S5, the billet cooling function curve at room temperature is established according to the following cooling function: in, The temperature of the steel billet after cooling time t. For ambient temperature, The initial temperature of the steel billet is given by k, where k is the cooling coefficient. The temperature distribution function at position x along the length of the steel billet is: Where t0 is the exposure time of the initial end of the billet before it enters the rolling line, and v is the conveying speed; The integrated control system calculates the initial temperature Tinitial and the final temperature Tfinal of the billet based on the temperature distribution function, and obtains the temperature difference between the initial and final ends of the billet. Wherein, ΔTs is the temperature difference between the beginning and end of the billet along its length.

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