A Rectangular Control Method for PVPC-3T Rolling in the Low-Temperature Zone of Heated Water Beams for Thick Plates

Abstract

This invention relates to the field of steel rolling technology, and in particular to a rectangular control method for PVPC-3T rolling in the low-temperature zone of a heated water beam for thick plates. The method includes the following steps: S1 Divide the billet into groups according to its length, match and set the inner parameter Inner-K1 and outer parameter Outer-K2 of the transverse groove in the 3T-Manual model, and create a reference table; S2 Accumulate data based on the billet cross-sectional dimensions and width ratio, and iteratively optimize to create a reference table for transverse groove depth values; S3 Utilize the uniform temperature characteristics of the steel plate in the width direction, and automatically set the longitudinal groove parameters through the PVPC-3T-Auto model; S4 Combine the parameters from S1-S2, manually set the transverse groove opening value, and automatically adjust the longitudinal groove parameters. This invention clarifies the optimization range of the transverse groove parameters, achieves refined control, solves the problem of width control in automatic models, and improves steel plate quality and yield.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a method for rectangular control of PVPC-3T rolling in the low-temperature zone of heated water beams for thick plates. Background Technology

[0002] In the field of heavy plate rolling production, yield is one of the core indicators for measuring production efficiency, and the planar shape quality of the steel plate directly determines the yield. During the steel plate rolling process, due to factors such as uneven metal flow and mismatch of rolling process parameters, planar shape defects such as irregular beginnings and ends and uneven width distribution are prone to occur. These defects need to be removed by cutting to meet the finished product specifications, which results in a large amount of steel waste and restricts the improvement of yield.

[0003] To address the aforementioned issues, PVPC planar shape control technology is widely used in the industry. The core of this technology is to achieve consistent metal elongation in the rolling direction by adjusting the variable reduction in intermediate passes during the rolling process, thereby improving the planar shape of the steel plate, reducing head and tail losses, and ultimately increasing the yield of thick plates. Among these technologies, the PVPC-3T-Auto model, as a typical application of PVPC technology, leverages its automated parameter setting capabilities to achieve rectangular control of steel plates in conventional production scenarios, providing technical support for stable production.

[0004] In recent years, with the continuous improvement of production efficiency and output requirements in the heavy plate industry, the rolling production conditions have undergone significant changes. The limitations of the original PVPC-3T-Auto model have gradually become apparent, especially in the rolling scenarios of specific billet specifications, where it shows obvious inadequacy. Actual production testing has revealed that when using 300mm thick cross-section billets and rolling heavy plates with a width ratio greater than 1.5, the finished steel plates generally exhibit quality problems such as large width differences between the same plate and localized narrow dimensions. Specifically, under the PVPC-3T-Auto rolling mode, the width distribution of the steel plate is uneven at the head, middle, and tail. Some areas become scrap due to width not meeting standard requirements, which not only seriously affects product quality stability but also leads to a rebound in head and tail cutting losses, greatly restricting further improvement in yield and failing to meet the current demand for efficient and high-quality production. Therefore, it is urgent to optimize the existing PVPC control scheme to solve the problem of planar shape control under the rolling of specific billet specifications, in order to adapt to the process requirements after the improvement of production efficiency and ensure a stable increase in yield. Summary of the Invention

[0005] To address the technical challenge of controlling the planar shape during the rolling of billets of specific specifications, this invention provides a method for rectangular control during the rolling of PVPC-3T in the low-temperature zone of a heated water beam for thick plates.

[0006] Therefore, the present invention provides the following technical solution: A method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by a water beam includes the following steps: S1. Based on the billet length distribution pattern and rolling control requirements, divide the billet length group interval, and match and set the inner parameter Inner-K1 and outer parameter Outer-K2 of the 3T-Manual transverse groove based on different length group intervals; make a parameter comparison table based on the billet length group interval and the matching setting results of the inner and outer parameters, and select the corresponding parameter values ​​of the inner parameter Inner-K1 and outer parameter Outer-K2 from the parameter comparison table according to the actual length of the billet to be rolled; S2. Accumulate measured data of rolled product width according to the billet cross-sectional dimensions and rolling width ratio. Judge the width expansion effect by comparing the measured width with the target width. After adjustment and correction test iterative optimization, make a cross groove depth value comparison table. Select the appropriate cross groove depth value from the comparison table according to the cross-sectional dimensions and rolling width ratio of the billet to be rolled. S3. Taking advantage of the relatively uniform temperature distribution of steel plates along the width direction in the rolling scenario, the PVPC-3T-Auto model is directly used to automatically set the longitudinal groove parameter values; S4. Based on the parameter values ​​of the inner parameter Inner-K1 and the outer parameter Outer-K2 obtained in steps S1-S2, as well as the transverse groove depth value, the groove opening value of the transverse groove is set using the 3T-Manual manual mode, while the matching parameters of the longitudinal groove are adjusted using the PVPC-3T-Auto automatic mode to complete the PVPC-3T rolling rectangular control of the low-temperature zone of the heating water beam for the wide and thick plate.

[0007] Furthermore, the specific data in the parameter lookup table mentioned in step S1 is as follows: When the billet length is 3000~3500mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. ; When the billet length is 3500~4000mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. ; When the billet length is 4000~4800mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. ; When the billet length is 4800~5200mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. .

[0008] Furthermore, the data in the table for referring to the transverse groove depth values ​​in step S2 is as follows: When the cross-sectional dimensions of the billet are 300×1950mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is ; 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is ; 2.1 When the rolling width ratio is >1.8, the cross groove depth value is ; 2.4 When the rolling width ratio is >2.1, the cross groove depth value is ; 2.7 When the rolling width ratio is >2.4, the cross groove depth value is ; When the rolling width ratio is >2.7, the transverse groove depth value is ; When the cross-sectional dimensions of the billet are 300×2200mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is ; 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is ; 2.1 When the rolling width ratio is >1.8, the cross groove depth value is ; 2.4 When the rolling width ratio is >2.1, the cross groove depth value is ; 2.7 When the rolling width ratio is >2.4, the cross groove depth value is ; When the rolling width ratio is >2.7, the transverse groove depth value is =5; When the cross-sectional dimensions of the billet are 300×2300mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is . 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is . 2.1 When the rolling width ratio is >1.8, the cross groove depth value is . 2.4 When the rolling width ratio is >2.1, the cross groove depth value is . 2.7 When the rolling width ratio is >2.4, the cross groove depth value is . When the rolling width ratio is >2.7, the transverse groove depth value is =5.

[0009] Furthermore, in step S2, the widening effect is judged by comparing the measured width with the target width: if the measured value is less than the target value, it indicates that the widening is insufficient and the depth of the transverse groove needs to be increased to increase the widening amount; if the measured value is greater than the target value, it indicates that the widening is excessive and the depth of the transverse groove needs to be reduced to reduce the widening amount.

[0010] Furthermore, in step S4, the slot opening value of the transverse groove is set using the 3T-Manual manual mode. The setting order is as follows: first, set the Inner-K1 internal parameter value determined in step 1, then set the Outer-K2 external parameter value determined in step 1, and finally set the transverse groove depth value determined in step S2.

[0011] Furthermore, the control method of steps S1 to S4 is applicable to 300mm cross-section billets, rolling width ratio greater than 1.5 wide and thick plates, and the wide and thick plates have a low temperature zone caused by the heating water beams of the steelmaking process.

[0012] Advantages and positive effects of the present invention: By conducting in-depth research and clarifying the optimization range of the internal parameters, external parameters, and depth values ​​of the transverse groove under the roughing PVPC-3T-Manual mode, the fine control of rolling parameters has been achieved, which can accurately address the width control problem that cannot be solved by the automatic model.

[0013] This invention is based on the existing PVPC technology system and improves performance by optimizing the core parameters in Manual mode. It does not require large-scale modification of existing rolling equipment, has low process adjustment costs, can be quickly integrated into existing production processes, and has strong engineering application feasibility. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 The flowchart of a method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by a water beam is provided by the present invention. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0017] This invention provides a method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by a water beam, such as... Figure 1 As shown, it includes the following steps: S1. Based on the billet length distribution pattern and rolling control requirements, divide the billet length group interval, and match and set the inner parameter Inner-K1 and outer parameter Outer-K2 of 3T-Manual transverse groove according to different length group intervals; make a parameter comparison table based on the billet length group interval and the matching setting results of inner and outer parameters, and select the corresponding inner parameter Inner-K1 and outer parameter Outer-K2 parameter values ​​from the parameter comparison table according to the actual length of the billet to be rolled. The specific data in the parameter lookup table for step S1 is as follows: When the billet length is 3000~3500mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. . When the billet length is 3500~4000mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. . When the billet length is 4000~4800mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. . When the billet length is 4800~5200mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. .

[0018] Specifically: When the billet length is 3000~3500mm, the Inner-K1 parameter value is 50% of the billet length, and the Outer-K2 parameter value is 80% of the billet length. When the billet length is 3500~4000mm, the Inner-K1 parameter value is 45% of the billet length, and the Outer-K2 parameter value is 70% of the billet length. When the billet length is 4000~4800mm, the Inner-K1 parameter value is 40% of the billet length, and the Outer-K2 parameter value is 60% of the billet length. When the billet length is 4800~5200mm, the Inner-K1 parameter value is 35% of the billet length, and the Outer-K2 parameter value is 55% of the billet length.

[0019] S2. Accumulate measured data on the width of rolled products based on the billet cross-sectional dimensions and rolling width ratio. Judge the width-expansion effect by comparing the measured width with the target width: if the measured value is less than the target value, it indicates insufficient width expansion, requiring an increase in the groove depth to increase the width. If the measured value is greater than the target value, it indicates excessive width expansion, requiring a decrease in the groove depth to reduce the width expansion. After adjustment and iterative optimization through correction experiments, create a groove depth value reference table. Select an appropriate groove depth value from this reference table based on the cross-sectional dimensions and rolling width ratio of the billet to be rolled.

[0020] The specific data in the table for the transverse groove depth values ​​in step S2 are as follows: When the cross-sectional dimensions of the billet are 300×1950mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is . 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is . 2.1 When the rolling width ratio is >1.8, the cross groove depth value is . 2.4 When the rolling width ratio is >2.1, the cross groove depth value is . 2.7 When the rolling width ratio is >2.4, the cross groove depth value is . When the rolling width ratio is >2.7, the transverse groove depth value is .

[0021] When the cross-sectional dimensions of the billet are 300×2200mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is . 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is . 2.1 When the rolling width ratio is >1.8, the cross groove depth value is . 2.4 When the rolling width ratio is >2.1, the cross groove depth value is . 2.7 When the rolling width ratio is >2.4, the cross groove depth value is . When the rolling width ratio is >2.7, the transverse groove depth value is =5. When the cross-sectional dimensions of the billet are 300×2300mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is . 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is . 2.1 When the rolling width ratio is >1.8, the cross groove depth value is . 2.4 When the rolling width ratio is >2.1, the cross groove depth value is . 2.7 When the rolling width ratio is >2.4, the cross groove depth value is . When the rolling width ratio is >2.7, the transverse groove depth value is =5.

[0022] Specifically: When the cross-sectional dimensions of the billet are 300×1950mm: 1.5 When the rolling width ratio is greater than 1.2, the transverse groove depth is 2. 1.8 When the rolling width ratio is greater than 1.5, the transverse groove depth is 2.7. 2.1 When the rolling width ratio is greater than 1.8, the transverse groove depth is 3. 2.4 When the rolling width ratio is greater than 2.1, the transverse groove depth is 3.6. 2.7 When the rolling width ratio is greater than 2.4, the transverse groove depth is 4.5. When the rolling width ratio is greater than 2.7, the transverse groove depth is 5. When the cross-sectional dimensions of the billet are 300×2200mm: 1.5 When the rolling width ratio is greater than 1.2, the transverse groove depth is 2. 1.8 When the rolling width ratio is greater than 1.5, the transverse groove depth is 3. 2.1 When the rolling width ratio is greater than 1.8, the transverse groove depth is 3.5. 2.4 When the rolling width ratio is greater than 2.1, the transverse groove depth is 4.2. 2.7 When the rolling width ratio is greater than 2.4, the transverse groove depth is 5. When the rolling width ratio is greater than 2.7, the transverse groove depth is 5. When the cross-sectional dimensions of the billet are 300×2300mm: 1.5 When the rolling width ratio is greater than 1.2, the transverse groove depth is 2. 1.8 When the rolling width ratio is greater than 1.5, the transverse groove depth is 3. 2.1 When the rolling width ratio is greater than 1.8, the transverse groove depth is 3.7. 2.4 When the rolling width ratio is greater than 2.1, the transverse groove depth is 4.5. 2.7 When the rolling width ratio is greater than 2.4, the transverse groove depth is 5. When the rolling width ratio is greater than 2.7, the transverse groove depth is 5.

[0023] S3. Taking advantage of the relatively uniform temperature distribution of steel plates along the width direction in the rolling scenario, the PVPC-3T-Auto model is directly used to automatically set the longitudinal groove parameter values.

[0024] S4. Based on the parameter values ​​of the inner parameter Inner-K1 and the outer parameter Outer-K2 obtained in steps S1-S2, as well as the transverse groove depth value, the groove opening value of the transverse groove is set using the 3T-Manual manual mode, while the matching parameters of the longitudinal groove are adjusted using the PVPC-3T-Auto automatic mode to complete the PVPC-3T rolling rectangular control of the low-temperature zone of the heating water beam for the wide and thick plate.

[0025] In step S4, the slot opening value of the transverse groove is set using the 3T-Manual manual mode. The setting order is as follows: first set the Inner-K1 inner parameter value determined in step 1, then set the Outer-K2 outer parameter value determined in step 1, and finally set the transverse groove depth value determined in step S2.

[0026] The control method of steps S1 to S4 is applicable to 300mm thick cross-section billets, rolling width ratio greater than 1.5 wide and thick plates, and wide and thick plates have a low temperature zone caused by the heating water beam of the steelmaking process.

[0027] The method provided by this invention increases the overall yield of 300mm thick cross-section billets and rolled steel plates with a width ratio of 1.5 or higher from 90.56% to 91.19%. This improves quality while significantly increasing production efficiency.

[0028] The specific improvements in yield are shown in the following statistics:

[0029] This invention utilizes existing equipment and processes, without increasing investment and production costs or the risk of equipment damage, while improving production efficiency, thus achieving cost reduction and efficiency improvement.

[0030] The products produced by the method of this invention can be widely used in the delivery of steel plates in various fields such as shipbuilding, bridges, construction and engineering machinery, ensuring the optimized control of rectangular rolling of steel plates.

[0031] Specific implementation case 1: For PVPC-3T rolling billets with dimensions of 300×1950×3400mm and a rolling width ratio of 1.9, select 10 or more billets for continuous centralized production. The following batch manual settings can be made for the rolling strategy: The horizontal slots Inner-K1 and Outer-K2 are set to 50% and 80% respectively.

[0032] The groove depth is set to 3mm.

[0033] The longitudinal groove parameters are set to Auto mode to automatically match the model parameters.

[0034] The rolling parameters for rough PVPC are set as follows:

[0035] Specific Implementation Case 2: For PVPC-3T rolling billets with dimensions of 300×2300×4500mm and a rolling width ratio of 2.3, select 10 or more billets for continuous centralized production. The following batch manual settings can be made for the rolling strategy: The horizontal slots Inner-K1 and Outer-K2 are set to 40% and 60% respectively; The groove depth is set to 4.5mm; The longitudinal groove parameters are set to Auto mode to automatically match the model parameters.

[0036] The rolling parameters for rough PVPC are set as follows:

[0037] Compare with Case 1: For rolled billets with dimensions of 300×1950×3800mm and a rolling width ratio of 1.3, select 10 or more billets for continuous centralized production. The PVPC-3T rolling strategy should be automatically set according to the Auto model. The horizontal slot parameter is set to Auto mode to automatically match the model parameters.

[0038] The longitudinal groove parameters are set to Auto mode to automatically match the model parameters.

[0039] Since the aspect ratio is less than 1.5, the method described in this application cannot be used. Therefore, the Auto mode is used to automatically set the parameters.

[0040] The rolling parameters for rough PVPC are set as follows:

[0041] The actual success rate of the above cases was 89.29%.

[0042] Compare with Case 2: For billets with dimensions of 300×2300×4500mm and a rolling width ratio of 1.6, select 10 or more billets for continuous centralized production. Since the width ratio is above 1.5, the Auto mode for automatically setting parameters will no longer be used. Therefore, the PVPC-3T rolling strategy can be manually set in batches as follows: The horizontal slots Inner-K1 and Outer-K2 are set to 40% and 60%, respectively.

[0043] The groove depth is set to 3mm.

[0044] The longitudinal groove parameters are set to Auto mode to automatically match the model parameters.

[0045] The rolling parameters for rough PVPC are set as follows:

[0046] The actual success rate of the above cases was 90.03%.

[0047] Compare with Case 3: For PVPC-3T rolling billets with dimensions of 300×1950×3800mm and a rolling width ratio of 2.3, select 10 or more billets for continuous centralized production. The following batch manual settings can be made for the rolling strategy: The horizontal slots Inner-K1 and Outer-K2 are set to 45% and 70%, respectively. The groove depth is set to 3.6mm; The longitudinal groove parameters are set to Auto mode to automatically match the model parameters.

[0048] The rolling parameters for rough PVPC are set as follows:

[0049] The actual success rate of the above cases was 91.54%.

[0050] By comparing the data from the above embodiments, the method provided by the present invention improves the overall yield of steel plates with a cross-sectional thickness of 300mm and a rolling width ratio of 1.5 or higher.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by water beams, characterized in that, Includes the following steps: S1. Based on the billet length distribution pattern and rolling control requirements, divide the billet length group interval, and match and set the inner parameter Inner-K1 and outer parameter Outer-K2 of the 3T-Manual transverse groove based on different length group intervals; make a parameter comparison table based on the billet length group interval and the matching setting results of the inner and outer parameters, and select the corresponding parameter values ​​of the inner parameter Inner-K1 and outer parameter Outer-K2 from the parameter comparison table according to the actual length of the billet to be rolled; S2. Accumulate measured data of rolled product width according to the billet cross-sectional dimensions and rolling width ratio. Judge the width expansion effect by comparing the measured width with the target width. After adjustment and correction test iterative optimization, make a cross groove depth value comparison table. Select the appropriate cross groove depth value from the comparison table according to the cross-sectional dimensions and rolling width ratio of the billet to be rolled. S3. Taking advantage of the relatively uniform temperature distribution of steel plates along the width direction in the rolling scenario, the PVPC-3T-Auto model is directly used to automatically set the longitudinal groove parameter values; S4. Based on the parameter values ​​of the inner parameter Inner-K1 and the outer parameter Outer-K2 obtained in steps S1-S2, as well as the transverse groove depth value, the groove opening value of the transverse groove is set using the 3T-Manual manual mode, while the matching parameters of the longitudinal groove are adjusted using the PVPC-3T-Auto automatic mode to complete the PVPC-3T rolling rectangular control of the low-temperature zone of the heating water beam for the wide and thick plate.

2. The method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by water beams according to claim 1, characterized in that, The specific data in the parameter comparison table mentioned in step S1 are as follows: When the billet length is 3000~3500mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. ; When the billet length is 3500~4000mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. ; When the billet length is 4000~4800mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. ; When the billet length is 4800~5200mm, the Inner-K1 parameter value is the billet length. The Outer-K2 parameter value is the length of the billet. .

3. The method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by water beams according to claim 1, characterized in that, The specific data in the reference table for the transverse groove depth value mentioned in step S2 is as follows: When the cross-sectional dimensions of the billet are 300×1950mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is The unit is mm; 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is The unit is mm; 2.1 When the rolling width ratio is >1.8, the cross groove depth value is The unit is mm; 2.4 When the rolling width ratio is >2.1, the cross groove depth value is The unit is mm; 2.7 When the rolling width ratio is >2.4, the cross groove depth value is The unit is mm; When the rolling width ratio is >2.7, the transverse groove depth value is The unit is mm; When the cross-sectional dimensions of the billet are 300×2200mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is The unit is mm; 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is The unit is mm; 2.1 When the rolling width ratio is >1.8, the cross groove depth value is The unit is mm; 2.4 When the rolling width ratio is >2.1, the cross groove depth value is The unit is mm; 2.7 When the rolling width ratio is >2.4, the cross groove depth value is The unit is mm; When the rolling width ratio is >2.7, the transverse groove depth value is =5, unit: mm; When the cross-sectional dimensions of the billet are 300×2300mm: 1.5 When the rolling width ratio is >1.2, the transverse groove depth value is The unit is mm; 1.8 When the rolling width ratio is >1.5, the transverse groove depth value is The unit is mm; 2.1 When the rolling width ratio is >1.8, the cross groove depth value is The unit is mm; 2.4 When the rolling width ratio is >2.1, the cross groove depth value is The unit is mm; 2.7 When the rolling width ratio is >2.4, the cross groove depth value is The unit is mm; When the rolling width ratio is >2.7, the transverse groove depth value is =5.

4. The method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by water beams according to claim 1, characterized in that, In step S2, the widening effect is judged by comparing the measured width with the target width: if the measured value is less than the target value, it indicates that the widening is insufficient and the depth of the transverse groove needs to be increased to increase the widening amount; if the measured value is greater than the target value, it indicates that the widening is excessive and the depth of the transverse groove needs to be reduced to reduce the widening amount.

5. The method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by water beams according to claim 1, characterized in that, In step S4, the slot opening value of the transverse groove is set using the 3T-Manual manual mode. The setting order is as follows: first, set the Inner-K1 internal parameter value determined in step 1, then set the Outer-K2 external parameter value determined in step 1, and finally set the transverse groove depth value determined in step S2.

6. The method for rectangular control of PVPC-3T rolling in the low-temperature zone of a thick plate heated by water beams according to claim 1, characterized in that, The control method described in steps S1 to S4 is applicable to 300mm thick cross-section billets, rolling width ratios greater than 1.5, and the 300mm thick plates have a low-temperature zone caused by the heating water beams of the steelmaking process.

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