Method for determining a roll shape of a finishing work roll of a medium-high carbon steel

Abstract

The application provides a method for determining a roll shape of a finishing work roll of medium-high carbon steel, comprising: obtaining an original roll shape of the finishing work roll; obtaining an axial single-side compensation range L and a starting point of the axial single-side compensation range L; obtaining a radial compensation amount delta; and superimposing the radial compensation amount delta within the axial single-side compensation range L starting from the starting point on the original roll shape to determine the roll shape of the finishing work roll. The application can improve the problem of excessive crown in the hot rolling process of medium-high carbon steel.

Description

Technical Field

[0001] This application relates to the field of metallurgical rolling technology, and in particular to a method for determining the roll shape of a work roll for finishing medium and high carbon steel. Background Technology

[0002] The crown of hot-rolled strip steel is a core indicator for measuring the quality of the strip shape. Its control precision directly affects the yield of downstream processes. Excessive crown will increase edge trimming loss. The formation of crown directly depends on the roll gap shape of the finishing work roll, which is determined by the roll shape of the work roll.

[0003] In the aforementioned strip shape control problem, medium and high carbon steels, due to their greater deformation resistance, exhibit a significantly higher wear rate of finishing work rolls during hot rolling than ordinary steels, with the wear being particularly concentrated near the strip edges. As the rolling process progresses, uneven wear occurs at the edges of the work rolls, resulting in localized indentations in the roll shape at corresponding positions. Consequently, the roll gap shape becomes distorted, and localized high points appear on the strip cross-section at the edges, altering the cross-sectional morphology.

[0004] X32 medium-high carbon steel, as a high-alloy tool steel, is widely used in high-grade saw blade substrates, elastic elements, and precision stamping parts due to its good hardenability, high elastic limit, and excellent wear resistance. However, because X32 medium-high carbon steel contains high levels of carbon and alloying elements, its resistance to high-temperature deformation is significantly increased. Furthermore, during the finishing rolling process, as the entry temperature of the finishing mill continuously decreases, the rolling force along the length of the strip continuously increases. This leads to a gradual increase in the convexity of the strip along its entire length, eventually exceeding the control range.

[0005] There has been relevant research in the existing technology regarding the control of crown and wear of work rolls in hot-rolled strip steel.

[0006] For example, patent publication CN116140376A discloses "a method for designing and setting the wear compensation roll shape of hot rolling work rolls". This method can reduce the depth of the wear groove of the work roll and improve defects such as local high points, large edge drop and narrow edge waves that occur in the later stage of rolling. However, the compensation position is preset by the compensation roll shape design stage, and there may be a deviation between it and the actual wear position.

[0007] The patent publication text CN105203731A discloses "a method and device for quantifying local high points of cross-sectional contour defects of strip steel". This method can accurately detect local high point defects in the cross-section of hot-rolled strip steel, but it does not associate the location of the local high point with the wear position of the edge of the work roll, nor does it use the location to guide the roll shape design.

[0008] Patent publication CN118926315A discloses "a method for improving the position of local high points in strip steel by work roll shifting." This method optimizes the position of the work roll shifting, preventing it from staying near the zero position and keeping the local high points on the strip cross-section away from the strip edge, further avoiding rib formation defects that may occur during cold rolling negative shifting. It adjusts the position of local high points through a shifting strategy without involving a redesign of the work roll shape.

[0009] The patent publication text CN116765148A discloses "a method for controlling the longitudinal distribution of crown of strip steel". This method controls the longitudinal distribution of crown by adjusting the lateral displacement of the work roll and the bending force of the roll, so that the crown attenuation phenomenon of the head and tail plates of hot continuous rolling strip steel is significantly improved or even eliminated. However, this method does not involve the redesign of the work roll shape and cannot solve the problem of mismatch between the original roll shape and the crown change law. Summary of the Invention

[0010] The present invention is made in view of the above-mentioned problems, and its purpose is to provide a method for determining the roll shape of the finishing roll of medium and high carbon steel, so as to solve the technical problem that the crown continuously increases due to the continuous increase of rolling force and the decrease of crown hit rate in the existing hot rolling process of medium and high carbon steel.

[0011] Specifically, the first aspect of the present invention provides a method for determining the roll shape of a finishing roll for medium and high carbon steel, characterized in that it includes: Obtain the original roll shape of the finishing mill work roll; Obtain the axial unilateral compensation range L and the starting point of the axial unilateral compensation range L; Obtain the radial compensation amount δ; On the original roll shape, starting from the starting point, the radial compensation amount δ is superimposed within the axial unilateral compensation range L to determine the roll shape of the finishing work roll.

[0012] Optionally, the axial unilateral compensation range is: ΔB≤L≤1.8ΔB; ΔB is the difference between the maximum and minimum finished product widths in a rolling plan.

[0013] Optionally, the radial compensation amount is: ΔC ≤ δ ≤ 1.6ΔC; ΔC is the difference between the current average maximum crown and the target maximum crown in a rolling plan.

[0014] Optionally, the current maximum crown average is the average of the maximum crown values ​​of each coil in the rolling schedule.

[0015] Optionally, the starting point is initially located as the position of the finishing work roll corresponding to the local high point of the strip edge.

[0016] Optionally, the local high point at the edge of the strip is a local convex position at the edge of the strip cross-sectional curve in a rolling plan.

[0017] Optionally, the worn roll profile of the finishing work roll is obtained, the wear amount is obtained based on the difference between the worn roll profile and the original roll profile of the finishing work roll, and the starting point is corrected based on the wear amount.

[0018] Optionally, when the curve value of the wear amount at the position corresponding to the starting point is the maximum value, the starting point is the position of the finishing work roll corresponding to the maximum wear amount.

[0019] Optionally, when the curve value of the wear amount at the position corresponding to the starting point is less than the maximum value, the starting point is corrected and positioned as the position of the finishing work roll corresponding to the maximum wear amount.

[0020] Optionally, the medium-high carbon steel is X32 medium-high carbon steel.

[0021] Optionally, the finished thickness of the medium-high carbon steel is 1mm to 3mm.

[0022] Compared with the prior art, the present invention has the following beneficial effects: This invention improves the accuracy and effectiveness of compensation by simultaneously acquiring three elements: the compensation starting point, the compensation range, and the compensation amount, and then superimposing the compensation amount on the original roll shape. This solves the technical problem of reduced crown hit rate caused by the continuous increase in crown due to the increasing rolling force during the hot rolling of medium and high carbon steel.

[0023] This invention does not depend on a specific rolling mill model or control system and can be applied to the production of medium and high carbon steel in various hot continuous rolling production lines, thus having good industrial promotion value. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this drawing 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 only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a graph showing the variation trend of the crown of a single medium-to-high carbon steel coil along its length.

[0026] Figure 2 This is a graph showing the variation trend of the maximum crown of different medium and high carbon steel coils with the rolling sequence in Example 1.

[0027] Figure 3 This is a diagram showing the change in the cross-sectional shape of the strip as the rolling sequence occurs in Example 1.

[0028] Figure 4 The diagram shows the original roll shape, worn roll shape, and roll shape error curve of the finishing work roll in Example 1.

[0029] Figure 5 This is a comparison curve of the original roll shape and the determined roll shape of the finishing work roll in Example 1. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following description and illustration are provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0031] Obviously, the following description is merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios without any inventive effort. Furthermore, it is understood that although the effort involved in such development may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0032] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0033] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0034] Figure 1 This is a graph showing the variation trend of the crown of a single medium- and high-carbon steel coil along its length. The graph indicates that, along the length of the coil, the crown is smaller at the head and larger at the tail.

[0035] This invention is applicable to conventional medium and high carbon steel grades, particularly X32 medium and high carbon steel. Its chemical composition and basic production process are conventional techniques in the field. By way of example and not limitation, the X32 medium and high carbon steel to which this invention applies may contain the following elements by weight percentage: C: 0.35%–0.45%, Si ≤ 0.60%, Mn ≤ 0.60%, Cr: 1.0%–1.5%, Mo: 0.2%–0.4%, V ≤ 0.2%, with the remainder being Fe and unavoidable impurities. The above chemical composition can be adjusted according to the specific steel grade, which can be understood and implemented by those skilled in the art.

[0036] Example 1 The method for determining the roll shape of medium and high carbon steel finishing rolls provided in this embodiment includes the following steps: 1. Obtain the original roll shape of the finishing mill work roll. In this embodiment, the original roll shape is the initial roll shape curve determined according to the rolling process requirements of X32 high carbon steel (finished thickness 2.5mm), such as... Figure 5 As shown.

[0037] 2. Obtain the axial single-sided compensation range L In this embodiment, the hot-rolled plan includes 50 coils of X32 medium and high carbon steel with width specifications ranging from 1020mm to 1280mm, i.e., the maximum finished product width is 1280mm and the minimum finished product width is 1020mm. ΔB=260mm, and the axial unilateral compensation range is: ΔB≤L≤1.8ΔB, i.e., 260mm≤L≤468mm. In this embodiment, the axial unilateral compensation range L is taken as 1.5ΔB, i.e., 400mm.

[0038] 3. Obtain the starting point of the axial unilateral compensation range L. (1) Preliminary positioning of the starting point: Obtain the variation of the strip cross-section within the hot rolling plan as the hot rolling sequence progresses. For example... Figure 3 As shown, within a complete rolling plan, the strip cross-sectional shape initially exhibits a normal parabolic shape, the strip cross-sectional shape in the middle of the plan shows a parabolic shape with decreasing height in the middle, and the strip cross-sectional shape at the end of the plan shows a plateau. The maximum convexity of the steel coil is 50um, indicating that there is a local high point on the edge of the strip cross-section. The compensation starting point is initially located at the position of the finishing work roll corresponding to this local high point.

[0039] (2) Correcting the positioning starting point: Obtain the worn roll profile of the finishing mill work roll, and obtain the wear amount based on the difference between the worn roll profile and the original roll profile. For example... Figure 4As shown, the roll shape error curve values ​​at the strip edge are greater than those at other positions. For the F7 finishing work roll, the roll shape error curve values ​​at the strip edge are -0.471mm (operating side) and -0.365mm (drive side), respectively, while the error curve value for the work roll corresponding to the middle of the strip is -0.290mm. The edge work roll shows 0.128mm more wear than the middle work roll, indicating that the edge position represents the maximum wear value. The initial positioning position corresponds to a wear value of -0.471mm, which is consistent with the maximum value at the edge (-0.471mm), indicating accurate initial positioning. The starting point should remain positioned at the finishing work roll position corresponding to this maximum value.

[0040] 4. Obtain the radial compensation amount δ The maximum crown value of each steel coil in the hot rolling plan is statistically analyzed and the average value is calculated. The first coil has a crown value of 89 μm, the 50th coil has a crown value of 52 μm, the current maximum average crown value is 65 μm, the target crown value is 40 μm, ΔC=25 μm, and the radial compensation amount is: ΔC≤δ≤1.6ΔC, that is, 25 μm≤δ≤40 μm. In this embodiment, δ is taken as 1.2ΔC, that is, δ is taken as 30 μm, of which the upper and lower work rolls are each 15 μm.

[0041] 5. Determine the shape of the finishing mill work rolls On the original roll profile, starting from the corrected starting point, δ=30μm is superimposed within L=400mm to determine the finish rolling work roll profile. For example... Figure 5 As shown, the curve after the roll shape is determined has a significant rise in the edge region compared to the original roll shape, which indicates that a radial compensation amount is superimposed starting from the edge.

[0042] After the medium and high carbon steel finishing work roll shape determined by the method of this embodiment is rolled on the mill, the average maximum value of the hot rolled crown of X32 medium and high carbon steel is 35.6μm, and the crown hit rate is 96%.

[0043] Crown accuracy rate = (Number of qualified crowning strip coils / Total number of strip coils produced) × 100% The number of qualified strip coils with a crown value ≤ 40μm is defined as the number of coils; the total number of strip coils produced is 50 coils.

[0044] Figure 2 This is a graph showing the variation trend of the maximum crown of different medium and high carbon steel coils with the rolling sequence in Example 1. The graph shows that within the same hot rolling plan, the maximum crown of different steel coils gradually decreases with the change of the rolling sequence, indicating that as the rolling plan progresses, the work rolls gradually wear down, and the maximum crown value gradually improves.

[0045] Example 2 The method for determining the roll shape of medium and high carbon steel finishing rolls provided in this embodiment differs from that in Embodiment 1 in that the axial unilateral compensation range L in this embodiment is ΔB, that is, L is 260mm.

[0046] After the medium and high carbon steel finishing work roll shape determined by the method of this embodiment is rolled on the mill, the average maximum value of the hot-rolled crown of X32 medium and high carbon steel is 38.2μm, and the crown hit rate is 88%.

[0047] Example 3 The method for determining the roll shape of medium and high carbon steel finishing rolls provided in this embodiment differs from that in Embodiment 1 in that: in this embodiment, the axial single-sided compensation range L is taken as 1.8ΔB, that is, L is taken as 468mm.

[0048] After the medium and high carbon steel finishing work roll shape determined by the method of this embodiment is rolled on the mill, the average maximum value of the hot rolled crown of X32 medium and high carbon steel is 37.5μm, and the crown hit rate is 90%.

[0049] Example 4 The method for determining the roll shape of the medium and high carbon steel finishing rolls provided in this embodiment differs from that in Embodiment 1 in that: in this embodiment, δ is taken as ΔC, that is, δ is taken as 25μm, of which the upper and lower work rolls are each 12.5μm.

[0050] After the medium and high carbon steel finishing work roll shape determined by the method of this embodiment is rolled on the mill, the average maximum value of the hot rolled crown of X32 medium and high carbon steel is 39.8 μm, and the crown hit rate is 82%.

[0051] Example 5 The method for determining the roll shape of medium and high carbon steel finishing rolling mill provided in this embodiment differs from that in Embodiment 1 in that: in this embodiment, δ is taken as 1.6ΔC, that is, δ is taken as 40μm, of which the upper and lower work rolls are each 20μm.

[0052] After the medium and high carbon steel finishing work roll shape determined by the method in this embodiment is rolled on the mill, the average maximum value of the hot-rolled crown of X32 medium and high carbon steel is 34.5μm, and the crown hit rate is 86%.

[0053] Example 6 The method for determining the roll shape of medium and high carbon steel finishing rolls provided in this embodiment includes the following steps: 1. Obtain the original roll shape of the finishing mill work roll. In this embodiment, the original roll shape is the initial roll shape curve determined according to the rolling process requirements of X32 high carbon steel (finished thickness 2.5mm).

[0054] 2. Obtain the axial single-sided compensation range L In this embodiment, the hot-rolled plan includes 50 coils of X32 medium and high carbon steel with width specifications ranging from 1050mm to 1250mm, i.e., the maximum finished product width is 1250mm and the minimum finished product width is 1050mm. ΔB=200mm, and the axial unilateral compensation range is: ΔB≤L≤1.8ΔB, i.e., 200mm≤L≤360mm. In this embodiment, the axial unilateral compensation range L is taken as 1.5ΔB, i.e., L is taken as 300mm.

[0055] 3. Obtain the starting point of the axial unilateral compensation range L. (1) Preliminary positioning of the starting point: Obtain the changes in the strip cross-section as the hot rolling sequence occurs within the hot rolling plan. In a complete rolling plan, the strip cross-section shape initially presents a normal parabolic shape, the strip cross-section shape in the middle of the plan presents a parabolic shape with decreasing height in the middle, and the strip cross-section shape at the end of the plan appears as a plateau. The maximum convexity of the coil is 48μm, indicating that a local high point appears at the edge of the strip cross-section. The compensation starting point is initially positioned at the position of the finishing work roll corresponding to this local high point.

[0056] (2) Correcting the starting point: Obtain the worn roll profile of the finishing work roll, and obtain the wear amount based on the difference between the worn roll profile and the original roll profile. The roll profile error curve values ​​of the F7 finishing work roll at the corresponding position on the edge of the strip are -0.452mm (operating side) and -0.348mm (drive side), respectively. The error curve value of the work roll corresponding to the middle of the strip is -0.278mm. The work roll corresponding to the edge is worn 0.174mm more than the work roll corresponding to the middle, indicating that the position corresponding to the edge is the position with the maximum wear amount (-0.452mm). The wear amount corresponding to the initial positioning position is -0.330mm, which is less than the maximum value of -0.452mm at the edge. The difference between the two wear amounts is 0.122mm, indicating that there is a deviation in the initial positioning. The starting point is corrected and positioned at the finishing work roll position corresponding to this maximum value (-0.452mm).

[0057] 4. Obtain the radial compensation amount δ The maximum crown value of each steel coil in the hot rolling plan is statistically analyzed and the average value is calculated. The first coil has a crown value of 86 μm, the 50th coil has a crown value of 50 μm, the current maximum average crown value is 62 μm, the target crown value is 40 μm, ΔC=22 μm, and the radial compensation amount is: ΔC≤δ≤1.6ΔC, that is, 22 μm≤δ≤35.2 μm. In this embodiment, δ is taken as 1.2ΔC, that is, δ is taken as 26.4 μm, of which the upper and lower work rolls are each 13.2 μm.

[0058] 5. Determine the shape of the finishing mill work rolls On the original roll shape, starting from the corrected starting point, δ=26.4μm is superimposed within L=300mm to determine the roll shape of the finishing work roll.

[0059] After the medium and high carbon steel finishing work roll shape determined by the method of this embodiment is rolled on the mill, the average maximum value of the hot-rolled crown of X32 medium and high carbon steel is 37.2μm, and the crown hit rate is 95%.

[0060] Example 7 The method for determining the roll shape of medium and high carbon steel finishing rolls provided in this embodiment differs from that in Embodiment 6 in that: no correction is performed on the positioning starting point.

[0061] After the medium and high carbon steel finishing work roll shape determined by the method of this embodiment is rolled on the mill, the average maximum value of the hot rolled crown of X32 medium and high carbon steel is 49.5μm, and the crown hit rate is 82%.

[0062] Comparative Example 1 This comparative example uses a conventional CVC roll profile (original roll profile) for rolling. The conventional CVC roll profile is the initial roll profile curve determined according to the rolling process requirements of X32 medium-high carbon steel (finished thickness 2.5mm), such as... Figure 5 As shown.

[0063] After rolling with the finishing work roll shape provided in this comparative example, the average maximum crown of hot-rolled X32 medium high carbon steel is 65μm, and the crown hit rate is 52%.

[0064] Comparative Example 2 The method for determining the roll shape of medium and high carbon steel finishing work rolls provided in this comparative example differs from that in Example 1 in that step 3, obtaining the starting point of the axial single-sided compensation range L, is not performed; instead, the compensation amount is directly superimposed starting from the edge of the finishing work roll.

[0065] After rolling with the finishing work roll profile provided in this comparative example, the average maximum crown of hot-rolled X32 medium high carbon steel is 48.7μm, and the crown hit rate is 68%.

[0066] Examples 1-3 show that the average maximum convexity value of Examples 2 (L is ΔB) and Examples 3 (L is 1.8ΔB) is greater than that of Example 1, and the convexity hit rate is less than that of Example 1. This may be because when the value of L is closer to ΔB, the compensation range cannot completely cover the edge wear area of ​​all width specifications; when the value of L is closer to 1.8ΔB, some compensation extends to the middle area of ​​the strip, which has a certain impact on the convexity control effect.

[0067] Examples 1, 4, and 5 show that the average maximum convexity value of Examples 4 (δ value is ΔC) and Examples 5 (δ value is 1.6ΔC) is greater than that of Example 1, and the convexity hit rate is less than that of Example 1. This may be because when the δ value is closer to ΔC, the compensation amount is smaller, and the convexity improvement of some steel coils is insufficient; when the δ value is closer to 1.6ΔC, the compensation amount is larger, and some steel coils may have a smaller convexity.

[0068] Examples 6 and 7 show that: Example 7, without correcting the positioning starting point, had a convexity hit rate of 72%, while Example 6, after correcting the positioning starting point, had a convexity hit rate of 95%, which is 23% higher than Example 7. This is because the correction step adjusts the starting point to the position of the maximum wear amount by measuring the actual wear amount, so that the compensation position corresponds to the actual wear position, thereby improving the convexity hit rate.

[0069] Comparative Example 1 uses the original roller shape, with a maximum average crown value of 65 μm and a crown hit rate of 52%. Compared with Example 1, Example 1 reduces the maximum average crown value by 45% and increases the crown hit rate by 44%. Compared with Example 6, Example 6 reduces the maximum average crown value by 43% and increases the crown hit rate by 43%.

[0070] Comparative Example 2 applied the same compensation amount as Example 1 (L=400mm, δ=30μm), but without starting point positioning and correction. The average maximum convexity was 48.7μm, and the convexity hit rate was 68%. Compared with Example 1, Example 1 reduced the average maximum convexity by 27% and increased the convexity hit rate by 28%. Compared with Example 6, Example 6 reduced the average maximum convexity by 24% and increased the convexity hit rate by 27%. Compared with Comparative Example 1, although the convexity hit rate of Comparative Example 2 was higher than that of Comparative Example 1, indicating that applying the compensation amount had a certain improvement effect, it was significantly lower than that of Example 1, indicating that the compensation effect was limited when starting point positioning and correction were not performed.

[0071] The method for determining the roll shape of finishing work rolls for medium and high carbon steel provided by this invention effectively improves the control accuracy of hot rolling crown of medium and high carbon steel, reduces the amount of trimming in downstream processes, and improves the overall yield. It can be applied to the design of finishing work roll shape in hot continuous rolling production lines, providing technical support for the high-quality production of thin-gauge medium and high carbon steel.

[0072] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for determining the roll shape of a finishing roll for medium and high carbon steel, characterized in that, include: Obtain the original roll shape of the finishing mill work roll; Obtain the axial unilateral compensation range L and the starting point of the axial unilateral compensation range L; Obtain the radial compensation amount δ; On the original roll shape, starting from the starting point, the radial compensation amount δ is superimposed within the axial unilateral compensation range L to determine the roll shape of the finishing work roll.

2. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 1, characterized in that, The axial unilateral compensation range is: ΔB≤L≤1.8ΔB; ΔB is the difference between the maximum and minimum finished product widths in a rolling plan.

3. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 1, characterized in that, The radial compensation amount is: ΔC≤δ≤1.6ΔC; ΔC is the difference between the current average maximum crown and the target maximum crown in a rolling plan.

4. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 3, characterized in that, The current maximum crown average is the average of the maximum crown values ​​of each steel coil in the rolling plan.

5. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 1, characterized in that, The starting point is initially located as the position of the finishing work roll corresponding to the local high point on the edge of the strip.

6. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 5, characterized in that, The local high point at the edge of the strip is a local convex position at the edge of the strip cross-sectional curve in a rolling plan.

7. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 5, characterized in that, The worn roll profile of the finishing work roll is obtained, the wear amount is obtained based on the difference between the worn roll profile and the original roll profile of the finishing work roll, and the starting point is corrected based on the wear amount.

8. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 7, characterized in that, When the curve value of the wear amount at the position corresponding to the starting point is the maximum value, the starting point is the position of the finishing work roll corresponding to the maximum wear amount.

9. The method for determining the roll shape of medium and high carbon steel finishing rolls according to claim 7, characterized in that, When the curve value of the wear amount at the starting point is less than the maximum value, the starting point is corrected and positioned as the position of the finishing work roll corresponding to the maximum wear amount.

10. The method for determining the roll shape of medium and high carbon steel finishing rolls according to any one of claims 1-9, characterized in that, The medium-high carbon steel mentioned is X32 medium-high carbon steel; And / or, the finished thickness of the medium-high carbon steel is 1mm to 3mm.

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