A method and system for controlling the surface quality of steel

Abstract

This invention discloses a method and system for controlling the surface quality of steel, belonging to the field of steel rolling technology. The process method of this invention is applied to a complete production line including heating devices, roughing mills, finishing mills, cooling equipment, and straightening machines. The core steps include: obtaining the specifications of the steel plate; matching a multi-pass descaling combination, including the "final empty pass" of the finishing mill, such as the first pass, the third pass, and the final empty pass; simultaneously increasing the finishing mill rolling speed by 10% to compensate for the temperature drop, and increasing the steel ejection and conveying speed. This method breaks the technical prejudice that strictly prohibits descaling at the end of the TMCP finishing mill to maintain temperature. Before the steel plate enters the cooling equipment and straightening machine, it removes the secondary iron oxide scale generated during the waiting period, eliminating the risk of the scale being pressed into the matrix in subsequent processes. The secondary iron oxide scale infiltration rate is reduced from 14.3% to below 3%, significantly improving surface quality.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a method and system for controlling the surface quality of steel. Background Technology

[0002] In the advanced manufacturing process of steel production, TMCP (Thermo-Mechanical Control Process) technology combines controlled rolling and controlled cooling, i.e., cooling equipment, to produce high-strength and high-toughness steel without adding too many alloying elements.

[0003] However, due to the special controlled rolling and cooling temperature range of the TMCP process, when the steel plate goes through heating, initial descaling, rough rolling, fine rolling, rapid cooling, and straightening processes in the production line, it is very easy to generate "red rust" and secondary iron oxide scale with strong adhesion.

[0004] In steel plates produced on conventional production lines, the iron oxide scale infiltration rate can be as high as 14.3%, while in steel plates produced using the non-TMCP process, the iron oxide scale infiltration rate is only about 0.2%. As a result, a large number of steel plates need to be reground, and some are even downgraded or scrapped due to severe infiltration, causing huge economic losses.

[0005] Research and analysis have revealed that the root causes of this problem mainly include: incorrect timing of descaling in the fine rolling mill, insufficient coverage of secondary iron oxide scale removal, and lack of control and operation methods for secondary iron oxide scale on the surface of the steel plate before entering the cooling equipment.

[0006] In existing rolling processes, to strictly ensure the lower limit of the final rolling temperature of TMCP steel plates before they enter the cooling equipment, the descaling device is prohibited from being activated during the latter half of the fine rolling mill, especially during the "final empty pass"—the pass where thickness reduction is not implemented and the steel plate is only allowed to pass through for finishing. This compromise in "temperature preservation" results in a large amount of newly formed red rust on the steel plate during the warming process. This rust is then directly passed through the cooling equipment and into the straightener. Under the pressure of the straightener's rollers, this residual secondary iron oxide scale is pressed into the steel plate matrix, forming surface pits and pits.

[0007] In view of the above problems, there is an urgent need for a method and system for controlling the surface quality of steel to completely solve the above technical defects. Summary of the Invention

[0008] In view of this, this application provides a steel surface quality control system. The main purpose is to solve the problem of excessive oxidation of steel plates in the later stages of fine rolling that cannot be covered by existing rolling processes for the TMCP process. It provides a method to forcibly incorporate the "last empty pass" into the descaling system of the fine rolling mill, so as to completely block the residue of secondary iron oxide scale from the process sequence before the steel plate enters the cooling equipment.

[0009] Another objective of this invention is to provide a method for controlling the surface quality of steel, which solves the process contradiction between the temperature loss caused by the end-stage descaling and the requirements for the controlled rolling temperature of steel plates. It provides a full-process heat compensation method by speeding up the fine mill and speeding up the rolling mill / conveying process, which can shorten the high-temperature exposure time and ensure the final rolling temperature while strongly peeling off the oxide scale.

[0010] According to a first aspect of the present invention, a method for controlling the surface quality of steel is provided, applied to a production line comprising, in sequence, a heating device, a roughing mill, a finishing mill, a cooling device, and a straightening machine, comprising: Step S1: Obtain the specifications of the steel plate to be produced, including but not limited to the width and thickness of the steel plate; Step S2: According to the specification parameters, match the corresponding multi-pass descaling combination of the fine mill body. The multi-pass descaling combination is to take the last empty pass in the rolling process of the fine mill as the target descaling pass and combine it in an orderly manner with at least one intermediate rolling pass among the first pass, the third pass, and the fifth pass. Step S3: Set rolling optimization parameters. The rolling optimization parameters include at least the rolling speed of each section, the steel throwing speed of the conveyor rollers on the steel plate, and the conveying speed. The rolling optimization parameters are greater than the rolling parameters based on the original process standard. Step S4: The steel plate billet is fed into the heating device for heating; In step S5, the heated steel plate is sequentially passed through the roughing mill for roughing, and after entering the fine mill, it is dynamically rolled and descaled in accordance with the multi-pass descaling combination matched in step S2 and the rolling optimization parameters set in step S3, in conjunction with the descaling device.

[0011] Furthermore, in step S2, the specific matching logic of the multi-pass descaling combination includes any of the following modes: the combination of the first pass and the last empty pass, the combination of the first pass and the third pass and the last empty pass, the combination of the first pass and the fifth pass and the last empty pass, or a full-coverage descaling combination including the first pass, the third pass, the fifth pass and the last empty pass.

[0012] Furthermore, when the obtained specification parameters of the steel plate are the first specification parameters, the corresponding multi-pass descaling combination is as follows: during the first pass, the third pass, and the last empty pass of the fine rolling mill, the descaling device is used to perform one descaling of the mill body, and the first specification parameters are that the thickness of the steel plate is 20mm and its width is 2.5m.

[0013] Further, in step S3, the process of setting the rolling optimization parameters is as follows: Increase the rolling parameters by at least 10% based on the original process standard; The rolling parameters include the rolling speed of each section, the steel plate throwing speed of the conveyor rollers, and the conveying speed.

[0014] Furthermore, in step S5, when the steel plate is in its last empty pass of the fine mill, the rolls of the fine mill do not apply a thickness reduction to the steel plate but only allow it to pass through for finishing, while the descaling device applies full-pressure spray to the steel plate during this pass.

[0015] Furthermore, the forced descaling of the fuselage during the final empty pass in step S5 pre-emptively removes oxide deposits from the steel plate surface.

[0016] Furthermore, the steel surface quality control method further includes: step S6, where the steel plate, after being thoroughly descaled in the last empty passage in step 5, is transported to the cooling equipment for controlled cooling and finally sent to the straightening machine to complete straightening; After performing step S6, the final secondary iron oxide scale indentation rate on the surface of the steel plate is less than 3%.

[0017] Furthermore, according to a second aspect of the present invention, a system for controlling the surface quality of steel plates as described in the above-described invention is provided, wherein the entire steel processing flow includes, in sequence according to the processing order: A heating device used for controlled heating of steel plate slabs; A roughing mill, located downstream of the heating device, is used to perform roughing rolling on the slab of the steel plate. A fine rolling mill, located downstream of the roughing mill, is used to perform multiple passes of fine rolling on the steel plate; Descaling device, used to perform multiple descaling operations, including the final empty pass; A cooling device is located downstream of the fine mill and is used to control the cooling of the steel plate exiting the fine mill. A straightening machine is located downstream of the cooling equipment and is used to flatten and straighten the cooled steel plate. Conveying roller conveyors, distributed throughout the aforementioned equipment, are used to transport the steel plates.

[0018] Furthermore, the system executes a preset TMCP descaling standard document for the mill body, and controls the rolling speed of the fine mill and the conveying speed of the conveyor rollers in a coordinated manner, so as to offset the temperature drop of the steel plate before entering the cooling equipment while increasing the number of descaling operations in the descaling device.

[0019] Furthermore, the system is equipped with a speed intervention module, which drives the rolling speed of the fine rolling mill to increase by 10% compared to the original process standard rolling speed.

[0020] Beneficial effects: The present invention provides a method and system for controlling the surface quality of steel. This application counterintuitively introduces the descaling of the "last empty pass" in fine rolling to induce the final forced cleaning of the steel plate before it enters the rapid cooling and straightening process. This overcomes the pain point of traditional processes that ignore oxides before entering the cooling bed due to the "temperature preservation" bias, and achieves complete removal of newly formed highly adhesive red rust, fundamentally blocking the physical path of oxides being pressed into the matrix by the straightening machine rollers.

[0021] In this application, the global synergy between the 10% increase in the rolling speed of the fine mill and the increase in the steel throwing / transporting speed leads to an increase in the frictional heat generated during rolling, and the exposure time of the steel plate throughout the entire process from the heating device to the cooling device is compressed to the extreme. This overcomes the contradiction of the TMCP final rolling temperature not meeting the standard due to blindly increasing the end descaling, and achieves "fast cooling compensation". While powerfully removing secondary oxide scale, it perfectly fulfills the strict controlled rolling and controlled cooling phase transformation requirements of TMCP.

[0022] Through the implementation and verification of this method, the iron oxide scale pressing rate of steel plates dropped drastically from 14.3% before implementation to below 3%, and stabilized at around 0.02% after optimization. The proportion of over-standard downgrades and re-judgments after rework dropped sharply from 32% to 0.05%, significantly improving the production stability of the entire process.

[0023] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0024] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0025] In the attached diagram: Figure 1A schematic flowchart of a steel surface quality control method provided by an embodiment of the present invention is shown; Figure 2 A system diagram of a steel surface quality control system provided by an embodiment of the present invention is shown.

[0026] Icon labels: 1-Steel plate; 3-Descaling device; 4-Cooling equipment; 5-Conveying roller conveyor; 6-Straightening machine; 7-Heating device; 21-Roughing mill; 22-Fine mill.

[0027] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example 1: As Figure 1 As shown, this embodiment discloses a steel surface quality control method that primarily utilizes process control methods throughout the entire process. This embodiment details the system execution process of the method in an actual production line, which completely overcomes the barriers preventing indentation from heating to straightening. The steel used in this embodiment is a TMCP slab.

[0032] In one feasible implementation, this application discloses a method for controlling the surface quality of steel. The method is applied to a production line that sequentially includes a heating device 7, a roughing mill 21, a fine mill 22, a cooling device 4, and a straightening machine 6. The method includes: step S1, obtaining the specification parameters of the steel plate 1 to be produced, the specification parameters including but not limited to the width and thickness of the steel plate 1. Step S2: According to the specification parameters, match the corresponding multi-pass descaling combination of the fine mill body. The multi-pass descaling combination is to take the last empty pass in the rolling process of the fine mill 22 as the target descaling pass and combine it in an orderly manner with at least one intermediate rolling pass among the first pass, the third pass, and the fifth pass. Step S3: Set rolling optimization parameters. The rolling optimization parameters include at least the rolling speed of each section, the steel throwing speed of the conveyor roller 5 to the steel plate 1, and the conveying speed. The rolling optimization parameters are greater than the rolling parameters based on the original process standard. Step S4: The steel plate 1 blank is fed into the heating device 7 for heating; In step S5, the heated steel plate 1 is rolled by the roughing mill 21 in sequence, and after entering the fine mill 22, it is dynamically rolled and descaled in accordance with the multi-pass descaling combination matched in step S2 and the rolling optimization parameters set in step S3, in conjunction with the descaling device 3.

[0033] In this embodiment, in step S2, the specific matching logic of the multi-pass descaling combination includes any of the following modes: the combination of the first pass and the last empty pass, the combination of the first pass and the third pass and the last empty pass, the combination of the first pass and the fifth pass and the last empty pass, or a full-coverage descaling combination including the first pass, the third pass, the fifth pass and the last empty pass.

[0034] In this embodiment, when the obtained specification parameters of the steel plate 1 are the first specification parameters, the corresponding multi-pass descaling combination is as follows: during the first pass, the third pass and the last empty pass of the fine rolling mill 22, the descaling device 3 is used to perform one descaling of the machine body. The first specification parameters are that the thickness of the steel plate 1 is 20mm and its width is 2.5m.

[0035] In this embodiment, the process of setting the rolling optimization parameters in step S3 is as follows: Increase the rolling parameters by at least 10% based on the original process standard; The rolling parameters include the rolling speed of each section, the steel-throwing speed of the conveyor roller 5 on the steel plate 1, and the conveying speed.

[0036] In this embodiment, during step S5, when the fine mill 22 is in its last empty pass, the rolls of the fine mill 22 do not apply a thickness reduction to the steel plate 1, but only allow it to pass through for finishing. At the same time, the descaling device 3 applies full-pressure spray to the steel plate 1 during this pass.

[0037] In this embodiment, the oxide deposits on the steel plate surface are pre-removed by the forced descaling of the fuselage during the last empty pass in step S5.

[0038] In this embodiment, the steel surface quality control method further includes: step S6, where the steel plate 1, after being thoroughly descaled in the last empty passage in step 5, is transported to the cooling equipment 4 for controlled cooling, and finally sent to the straightening machine 6 to complete straightening; After performing step S6, the final secondary iron oxide scale indentation rate on the surface of the steel plate 1 is less than 3%.

[0039] Example 2: This example is a further refinement of the method described in Example 1, specifically illustrating the execution process of the method disclosed in Example 1 in an actual TMCP slab production line.

[0040] Step 1: Preparatory and heating work: First, the TMCP slab to be rolled is fed into heating device 7 and heated according to a specific temperature curve. After exiting the furnace, the system reads the specification parameters (thickness and width) of the TMCP slab to be rolled from the MES schedule. Due to the significant differences in the iron oxide scale formation characteristics of different types and specifications of TMCP steel plates, the system will call the newly formulated descaling operation standard document for the fine rolling mill.

[0041] Step 2: Rough Rolling: After the heated steel plate 1 is initially descaled by high-pressure water, it is sent to the roughing mill 21 for multi-pass reversible rough rolling to roll the thick slab of steel plate 1 into an intermediate billet. At this time, the intermediate billet of steel plate 1 is sent to the fine rolling stage by the conveyor roller table 5.

[0042] Step 3: Multi-pass descaling in fine rolling: When the steel plate enters the fine rolling mill 22, this application completely overturns the traditional practice of "descaling only in the first pass". In this application, based on the built-in descaling standard document, the system makes the "last empty pass", i.e., the roll gap of the fine rolling mill is open, no reduction is applied, and the steel plate 1 only passes through for finishing as a mandatory activation item. For example, for a steel plate with a thickness of 20mm and a width of 2.5m, the determined descaling sequence is: three descaling operations are performed in the rolling stage of the fine rolling mill 22, respectively, in the first pass, the third pass, and the last pass, i.e., the last empty pass, with the descaling device 3 activated. In this application, the first and third passes are used to remove the thick scale accumulated in the rough rolling and previous stages, while the descaling in the last empty pass plays a key "cleaner" role, thoroughly sweeping away the thin and highly adhesive layer of red rust that precipitates during the warming and the second half of the fine rolling process.

[0043] Step 4: The introduction of "final empty pass descaling" inevitably leads to a significant loss of heat from the surface of steel plate 1, threatening the final rolling temperature before entering the cooling equipment 4. To address this thorny issue, this application implements "global speed-up thermal compensation": that is, while ensuring the stability of the fine mill 22, the rolling speed of each section is gradually increased, for example, by 10% at the beginning. This not only offsets the additional deformation heat generated by accelerating plastic deformation, but more importantly, it simultaneously increases the steel-throwing speed of the conveyor roller 5, the speed at which the plate tail leaves the fine mill, and the conveying speed. Through this composite speed increase, the high-temperature waiting time of the steel plate is compressed to the extreme, cutting off the life cycle of secondary iron oxide scale growth at the source of chemical reaction.

[0044] Step 5: After the descaling and speed-up processes described above, the steel plate 1 has a smooth and flawless surface. When it is immediately transported to the downstream cooling equipment 4 for controlled cooling of the microstructure phase transformation, since there is no residual red rust on the surface, the oxides are completely prevented from being drawn in by the cooling water flow. Finally, the cooled steel plate 1 smoothly enters the straightener 6. In the past, this was the "high-incidence period" when secondary iron oxide scale was forcefully crushed into the steel plate matrix by the straightening rollers, forming pits; however, due to the early intervention of this invention in the fine rolling pass, the surface of the steel plate entering the straightener 6 completely eliminates the pressing defect from the physical source.

[0045] In this implementation method, after implementing the aforementioned comprehensive control approach, systematic training for rolling mill operators and strict adherence to descaling standards are crucial. Taking data from a steel plant production line as an example: the amount of iron oxide scale pressed in decreased sharply from 460 tons per month at the initial stage to 25 tons; the iron oxide scale pressing rate plummeted from 14.3% to 2.5%, far below the set target of 3%, and after further optimization, it stabilized at an extremely low level of around 0.02%. After rework, the proportion of excess inventory downgraded and reclassified from non-compliant levels dropped dramatically from 32% to 0.05%, significantly improving the stability and economic efficiency of the entire production process.

[0046] Example 3: As Figure 2As shown, this embodiment discloses a system for controlling the surface quality of steel plates using the methods described in Embodiments 1 and 2. The system, in sequence according to the processing order, includes: a heating device 7 for controlled heating of the steel plate 1 slab; a roughing mill 21, located downstream of the heating device 7, for roughing the steel plate 1 slab; a finishing mill 22, located downstream of the roughing mill 21, for performing multi-pass finishing rolling on the steel plate 1; a descaling device 3 for performing multi-pass descaling operations, including a final empty pass; a cooling device 4, located downstream of the finishing mill 22, for rapidly and controlled cooling of the steel plate 1 exiting the finishing mill to induce a phase transformation; a straightening machine 6, located downstream of the cooling device 4, for leveling and straightening the cooled steel plate; and a conveyor roller conveyor 5, distributed throughout the above-mentioned equipment, for transporting the steel plate 1.

[0047] In this embodiment, the system executes a preset TMCP descaling standard document and controls the rolling speed of the fine mill 22 and the conveying speed of the conveyor roller table 5 in conjunction with each other, so as to offset the temperature drop of the steel plate before entering the cooling equipment 4 while increasing the number of descaling cycles in the descaling device 3.

[0048] In this embodiment, the system is equipped with a speed intervention module, which drives the rolling speed of the fine rolling mill 22 to increase by 10% compared with the original process standard rolling speed, and simultaneously shortens the generation cycle of secondary iron oxide scale on the steel plate 1, ensuring that the steel plate surface entering the straightening machine is smooth and free of red rust.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for controlling the surface quality of steel, applied to a production line comprising, in sequence, a heating device (7), a roughing mill (21), a finishing mill (22), a cooling device (4), and a straightening machine (6), characterized in that, include: Step S1: Obtain the specifications of the steel plate (1) to be produced, including but not limited to the width and thickness of the steel plate (1); Step S2: According to the specification parameters, match the corresponding multi-pass descaling combination of the fine mill body. The multi-pass descaling combination is to take the last empty pass in the rolling process of the fine mill (22) as the target descaling pass and combine it in an orderly manner with at least one intermediate rolling pass among the first pass, the third pass, and the fifth pass. Step S3: Set rolling optimization parameters. The rolling optimization parameters include at least the rolling speed of each section, the steel throwing speed of the conveyor roller (5) on the steel plate (1), and the conveying speed. The rolling optimization parameters are greater than the rolling parameters based on the original process standard. Step S4: The billet of the steel plate (1) is fed into the heating device (7) for heating; In step S5, the heated steel plate (1) is rolled in the roughing mill (21) and then enters the fine mill (22). According to the multi-pass descaling combination matched in step S2 and the rolling optimization parameters set in step S3, the descaling device (3) performs dynamic finishing rolling and descaling operations.

2. The method for controlling the surface quality of steel according to claim 1, characterized in that: In step S2, the specific matching logic of the multi-pass descaling combination includes any of the following modes: the combination of the first pass and the last empty pass, the combination of the first pass and the third pass and the last empty pass, the combination of the first pass and the fifth pass and the last empty pass, or a full-coverage descaling combination including the first pass, the third pass, the fifth pass and the last empty pass.

3. The method for controlling the surface quality of steel according to claim 2, characterized in that: When the obtained specification parameters of the steel plate (1) are the first specification parameters, the corresponding multi-pass descaling combination is as follows: during the first pass, the third pass and the last empty pass of the fine rolling mill (22), the descaling device (3) is used to perform one descaling of the machine body. The first specification parameter is that the thickness of the steel plate (1) is 20mm and its width is 2.5m.

4. The method for controlling the surface quality of steel according to claim 1, characterized in that: In step S3, the process of setting the rolling optimization parameters is as follows: Increase the rolling parameters by at least 10% based on the original process standard; The rolling parameters include the rolling speed of each section, the throwing speed of the conveyor rollers (5) on the steel plate (1), and the conveying speed.

5. The method for controlling the surface quality of steel according to claim 1, characterized in that: In step S5, when the last empty pass of the fine mill (22) is in progress, the rolls of the fine mill (22) do not apply a thickness reduction to the steel plate (1) but only allow it to pass through for finishing, while the descaling device (3) sprays the steel plate (1) at full pressure during this pass.

6. The method for controlling the surface quality of steel according to claim 1, characterized in that: By performing forced descaling of the fuselage in the final empty passage in step S5, the oxide deposits on the surface of the steel plate are eliminated in advance.

7. The method for controlling the surface quality of steel according to claim 1, characterized in that: Also includes: In step S6, the steel plate (1) that has been thoroughly descaled in the last empty passage as described in step 5 is transported to the cooling equipment (4) for controlled cooling and finally sent to the straightening machine (6) to complete straightening. After performing step S6, the final secondary iron oxide scale indentation rate on the surface of the steel plate (1) is less than 3%.

8. A system for controlling the surface quality of steel plates by implementing the method as described in any one of claims 1 to 7, characterized in that, The entire process of steel (1) includes the following steps in the order of processing: Heating device (7) is used for controlled heating of the steel plate (1) slab; A roughing mill (21) is located downstream of the heating device (7) and is used to rough roll the slab of the steel plate (1). A fine rolling mill (22) is located downstream of the rough rolling mill (21) and is used to perform multiple passes of fine rolling on the steel plate (1); Descaling device (3) is used to perform multiple descaling operations, including the last empty pass. Cooling equipment (4) is located downstream of the fine mill (22) and is used to control the cooling of the steel plate (1) exiting the fine mill. A straightening machine (6) is located downstream of the cooling equipment (4) and is used to straighten and flatten the cooled steel plate. Conveying rollers (5) are distributed throughout the above-mentioned equipment and are used to transport the steel plate (1).

9. The system for controlling the surface quality of steel plates according to claim 8, characterized in that: The system executes a preset TMCP descaling standard document for the machine body, and controls the rolling speed of the fine mill (22) and the conveying speed of the conveying roller table (5) in a coordinated manner, so as to offset the temperature drop of the steel plate before entering the cooling equipment (4) while increasing the number of descaling operations in the descaling device (3).

10. The system for controlling the surface quality of steel plates according to claim 8, characterized in that: The system is equipped with a speed intervention module, which drives the rolling speed of the fine rolling mill (22) to be increased by 10% compared with the original process standard rolling speed.

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