A method for controlling rolling of a wide thin gauge 300 series stainless steel cold sheet
By controlling the centering offset of the steel coil, selecting the appropriate mill roll shape, and optimizing the rolling process, the problems of deviation and strip breakage during the rolling process of wide and thin 300 series stainless steel cold-rolled sheets were solved, improving production efficiency and yield, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANXI TAIGANG STAINLESS STEEL CO LTD
- Filing Date
- 2026-03-18
- Publication Date
- 2026-06-05
AI Technical Summary
Wide, thin 300 series stainless steel cold-rolled sheets are prone to deviation and strip breakage during the rolling process, resulting in low production efficiency, low yield and high cost.
By controlling the centering offset of the steel coil feed, selecting appropriate parameters for the intermediate rolls and work rolls of the rolling mill, and optimizing the rolling process and strip shape control, including controlling the deformation rate, tension, and actual stress deviation of the strip shape, the problems of deviation and strip breakage can be solved in stages.
It effectively improved the problems of belt deviation and breakage, increased the product qualification rate, reduced production costs, and improved the stability of the rolling process.
Smart Images
Figure CN122142098A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of stainless steel plate production and processing technology, specifically relating to a rolling control method for wide, thin-gauge 300 series stainless steel cold-rolled plates. Background Technology
[0002] 300 series stainless steel sheet is currently the most widely used stainless steel material. It is mainly composed of austenitic structure and has excellent corrosion resistance, formability and weldability. It is widely used in all aspects of modern industry and life.
[0003] Wide-width, thin-gauge 300-series stainless steel cold-rolled sheets are typically rolled using a Sendzimir 20-roll mill with multi-pass reversible rolling. However, during the rolling of wide-width, thin-gauge 300-series stainless steel cold-rolled sheets, the steel coils are prone to severe deviation, leading to reduced rolling speed and significantly decreased production efficiency. Furthermore, with the increase in the number of passes, the reduction in thickness, and the increase in work hardening, operators need to control the strip shape at multiple different positions along the width direction, especially when deviation occurs, making shape control even more difficult. If the control scheme is inadequate, the surface of the steel coil is highly susceptible to defects such as stamping, which can even lead to strip breakage, resulting in a significant decrease in product yield and a substantial increase in production costs. These issues require improvement. Summary of the Invention
[0004] In order to solve all or some of the above problems, the purpose of this invention is to provide a rolling control method for wide and thin 300 series stainless steel cold-rolled sheets, which can effectively improve the problems of misalignment and strip breakage, thereby improving the production qualification rate and reducing production costs.
[0005] This invention provides a rolling control method for wide, thin-gauge 300 series stainless steel cold-rolled sheets, comprising the following steps: S1 controls the centering offset of the steel coil during feeding into the rolling mill; S2, Select the intermediate roll of the rolling mill according to the width of the coil; S3 controls the deformation rate, rolling passes, and work roll roughness parameters; S4 controls the actual stress deviation of the edge and middle plate shape.
[0006] Alternatively, in S1: The centering offset of the steel coil during feeding is controlled to be 0-10mm.
[0007] Alternatively, in S2: If rolling 300 series stainless steel cold-rolled sheets with a width of 1500-1600mm, then choose: An intermediate roller has a cone length of 250-270 mm and a cone length: cone height ratio of 1:0.0015-0.0025. Two intermediate rollers, with a crown of 0.15-0.25mm; The work roll has a crown of 0 mm.
[0008] Alternatively, in S2: If rolling 300 series stainless steel cold-rolled sheets with a width of 1600-1650mm, then choose: An intermediate roller has a cone length of 150-170mm and a cone length: cone height ratio of 1:0.0020-0.0030. Two intermediate rollers, with a crown of 0.15-0.25mm; The work roll has a crown of 0 mm.
[0009] Alternatively, in S3: The total deformation rate should be controlled at 75-85%; The rolling passes should be controlled to be 8-11. The roughness of the working roller is controlled to be 0.1-0.9μm.
[0010] Alternatively, in S3: The deformation rate for the first pass should be controlled at 23-26%. The deformation rate of the finished product should be controlled at 9-12%.
[0011] Alternatively, in S3: The initial unit tension for the first pass should be controlled at 260-280 N / mm. 2 The unit tension difference between the front and rear is 180-220 N / mm. 2 ; Control the pre-pass unit tension for passes 2-4 to be 320-340 N / mm 2 The unit tension difference between the front and rear is 5-10 N / mm. 2 ; Control the unit tension of the 5th pass before the finished product to be 340-350 mm. 2 The unit tension difference before and after is 10-15 N / mm. 2 ; The unit tension of the finished product pass should be controlled at 350-370 mm. 2 The unit tension difference between the front and rear is 25-35 N / mm. 2 .
[0012] Alternatively, in S3: The surface roughness of the work rolls in the first four passes is controlled to be 0.7-0.9 μm; The surface roughness of the work rolls in the 5th to finished product pass is controlled to be 0.1-0.3 μm.
[0013] Alternatively, in S4: The actual stress deviation of the edge plate shape in the first 1-3 passes should be controlled to be 10-80 N / mm. 2The actual stress deviation of the middle plate is 10-80 N / mm. 2 ; The actual stress deviation of the edge plate shape in the 4th-finishing pass is controlled to be -60 to 0 N / mm. 2 The actual stress deviation within the range and in the middle of the plate is 10-80 N / mm. 2 .
[0014] Alternatively, in S4: The plate shape measurement area is opened during the first 7 rolling passes, and the plate shape measurement areas 13-16 and 30-33 are closed during the 8th to the finished product rolling passes, with the operating side and the transmission side being closed symmetrically. Before rolling, the transverse thickness of the steel coil is scanned. When the thickness on the operating side is greater than that on the drive side and the wedge ratio is ≥1%, tilt compensation of 7-15 N / mm is added for the first 1-3 passes. 2 When the thickness on the transmission side is greater than that on the operating side and the wedge ratio is ≥1%, tilt compensation of -7-15 N / mm is added for the first 1-3 passes. 2 .
[0015] As can be seen from the above technical solution, the rolling control method for wide-width, thin-gauge 300 series stainless steel cold-rolled sheets provided by the present invention has the following advantages: This rolling control method can effectively improve the problems of misalignment and strip breakage by controlling the centering offset of the feed, optimizing the rolling roll shape, optimizing the rolling process, and optimizing the strip shape control. It can improve the production qualification rate of products and reduce production costs.
[0016] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description
[0017] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
[0018] Figure 1 This is a flowchart illustrating an embodiment of the present invention; Figure 2 This is a graph showing the target shape curves for each cold rolling pass in an embodiment of the present invention. Figure 3 This is a graph showing the target shape curves for each cold rolling pass in an embodiment of the present invention. Figure 4 This is a diagram of the sheet shape measurement area for each cold rolling pass in an embodiment of the present invention; Figure 5 This is a diagram of the sheet shape measurement area for each cold rolling pass in an embodiment of the present invention. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.
[0020] Through on-site tracking, it was found that the problems of misalignment and strip breakage are two major challenges in the rolling of wide and thin 300 series stainless steel cold-rolled sheets. The problems of misalignment and strip breakage interfere with each other during the rolling process, resulting in a complex rolling stability control scheme, excessive human intervention, low rolling efficiency and high risk.
[0021] Based on the analysis of the above two problems, a rolling control method for wide-width, thin-gauge 300 series stainless steel cold-rolled sheets is proposed. The specific scheme is to control the coil shape and strip breakage problem in each pass, control the coil shape problem in passes 1-7, and control the strip breakage problem in passes 8 to the finished product. It involves four aspects: feeding and centering operation, roll shape design, rolling process specifications, and sheet shape control operation specifications. It is systematic and practical.
[0022] like Figures 1-5 The figure shown is an embodiment of the present invention, which discloses a rolling control method for wide, thin-gauge 300 series stainless steel cold-rolled sheets, including the following steps: S1 controls the centering offset of the steel coil during feeding into the rolling mill; S2, Select the intermediate roll of the rolling mill according to the width of the coil; S3 controls the deformation rate, rolling passes, and work roll roughness parameters; S4 controls the actual stress deviation of the edge and middle plate shape.
[0023] In S1, the centering offset of the steel coil during feeding is controlled to be 0-10mm.
[0024] In step S2, if rolling 300-series stainless steel cold-rolled sheets with a width of 1500-1600mm, an intermediate roll with a cone length of 250-270mm and a cone length:cone height ratio of 1:0.0015-0.0025 is selected, along with two intermediate rolls with a crown of 0.15-0.25mm, and a work roll with a crown of 0mm. In this application, the cone length of the intermediate roll is preferably 260mm.
[0025] In S2, if rolling 300-series stainless steel cold-rolled sheets with a width of 1600-1650mm, an intermediate roll with a cone length of 150-170mm and a cone length:cone height ratio of 1:0.0020-0.0030 is selected; two intermediate rolls with a crown of 0.15-0.25mm are selected; and a work roll with a crown of 0mm is selected. In this application, the cone length of the intermediate roll is preferably 160mm.
[0026] In S3, the total deformation rate is controlled at 75-85%, with the deformation rate of the first pass controlled at 23-26% and the deformation rate of the finished product pass controlled at 9-12%. The number of rolling passes is controlled at 8-11, and the work roll roughness is controlled at 0.1-0.9 μm. Specifically, the work roll roughness for passes 1-4 is controlled at 0.7-0.9 μm, and the work roll roughness for passes 5 through the finished product pass is controlled at 0.1-0.3 μm. Simultaneously, the unit tension before and after each pass is controlled, with specific parameters shown in Table 1.
[0027] Table 1. Parameters of unit tension before and after each pass of the rolling mill.
[0028] In S4, the actual stress deviation of the edge plate shape is controlled to be 10-80 N / mm for the first 1-3 passes. 2 The actual stress deviation of the middle plate is 10-80 N / mm. 2 As the number of passes increases, the deviation between the actual stress at the edges and the actual stress in the center of the plate decreases. In this application, the target plate shape curves for the first three rolling passes are as follows: Figure 2 As shown.
[0029] In S4, the actual stress deviation of the edge plate shape in the 4th finishing pass is controlled to be -60-0 N / mm. 2 The actual stress deviation within the range and in the middle of the plate is 10-80 N / mm. 2 As the number of passes increases, the actual stress deviation value of the edge plate decreases, while the actual stress deviation value of the middle plate increases. In this application, the target plate shape curve for the 4th-finishing pass is as follows: Figure 3 As shown.
[0030] In S4, such as Figure 4 As shown, the plate shape measurement area is opened during the first 7 rolling passes, as... Figure 5 As shown, during the 8th rolling pass (finished product pass), measurement areas 13-16 and 30-33 of the plate shape are closed, with the operating side and drive side closed symmetrically. Among these, Figure 4 and Figure 5 In the diagram, blue indicates the open area and red indicates the closed area.
[0031] In S4, the transverse thickness of the steel coil is scanned before rolling. When the thickness on the operating side is greater than that on the drive side and the wedge ratio is ≥1%, tilt compensation of 7-15 N / mm is added for the first 1-3 passes. 2 When the thickness on the transmission side is greater than that on the operating side and the wedge ratio is ≥1%, tilt compensation of -7-15 N / mm is added for the first 1-3 passes. 2 .
[0032] The rolling control method in this embodiment, by controlling the centering offset of the feeding, can minimize the deviation problem caused by the feeding operation, providing good rolling conditions for subsequent process control. Through the roll shape design, intermediate rolls with sufficient taper and sufficient convexity can be provided. By combining the axial lateral movement of the intermediate rolls and the convexity of the two intermediate rolls, the expected value of the plate shape control during the rolling process can be met and achieved, ensuring that the post-rolled plate shape is controllable at all transverse positions.
[0033] Furthermore, by standardizing the total rolling deformation rate, total number of passes, pass deformation rate, and tension, it is possible to ensure a reasonable distribution of rolling pressure in each pass, significantly reducing rolling pressure and improving coil stability. In addition, by standardizing strip shape control operations, it is possible to reduce strip breakage caused by raw material inconsistencies and improper operation, ensuring that the strip shape is straight after each pass.
[0034] Actual production testing has shown that this rolling control method has successfully solved the rolling problem of wide-width, thin-gauge 300 series stainless steel. The incidence of deviation and strip breakage has been reduced from 5% to below 0.5%, and the product qualification rate has been greatly improved.
[0035] To illustrate this application more clearly, the following are specific embodiments of this application: Example 1 One 0.5 mm coil is rolled using a Sendzimir 20-roll mill. The specific rolling control method for 1545mm diameter 304 stainless steel cold-rolled sheet is as follows: S1, the offset of the steel coil in the mill centering during feeding is controlled within 5mm.
[0036] S2, select an intermediate roller with a cone length of 260mm and a cone length: cone height ratio of 1:0.0020, select a second intermediate roller with a crown of 0.20mm, and select a work roller with a crown of 0mm.
[0037] S3 controls the rolling passes to be 9, and the deformation rates of the first to ninth passes are 23%, 18.5%, 16.2%, 14.9%, 14.2%, 13.6%, 13.3%, 12.9%, and 11%, respectively.
[0038] Control the unit tension before and after each pass, as shown in Table 2.
[0039] Table 2. Unit tension parameters before and after each pass of the rolling mill.
[0040] The surface roughness of the work rolls in the first to fourth passes is controlled to be 0.782 μm, and the surface roughness of the work rolls in the fifth to the finished product pass is controlled to be 0.155 μm.
[0041] S4, control the actual stress deviation values of the edge plate shape for the 1st to 3rd passes to be 40, 20, and 10 N / mm respectively. 2 The actual stress deviations of the middle plate were 40, 20, and 10 N / mm2, respectively.
[0042] The actual stress deviation values of the edge plate shape for passes 4-9 were controlled to be 0, -10, -15, -20, -25, and -30 N / mm, respectively. 2 The actual stress deviations of the middle plate were 10, 15, 20, 25, 30, and 35 N / mm, respectively. 2 .
[0043] The plate shape measurement area is opened during rolling passes 1-7, and the plate shape measurement areas 13-16 and 30-33 are closed during rolling passes 8-finished. The operation side and the transmission side are closed symmetrically.
[0044] Before rolling, the transverse thickness of the steel coil is scanned. The thickness on the operating side is greater than that on the drive side, and the wedge ratio is 1.2%. An inclination compensation of 13 N / mm is added for the first three passes. 2 During rolling, the steel coil deviates by 3mm on the drive side, and the plate shape curve shifts by 3mm.
[0045] Tests showed that no deviation or strip breakage occurred during the rolling process, and the stability of the rolling process met expectations.
[0046] Example 2 One 0.5 mm coil is rolled using a Sendzimir 20-roll mill. The specific rolling control method for 1625mm diameter 304 stainless steel cold-rolled sheet is as follows: S1, the offset of the steel coil in the mill centering during feeding is controlled within 6mm.
[0047] S2, select an intermediate roller with a cone length of 160mm and a cone length: cone height ratio of 1:0.0018, select a second intermediate roller with a crown of 0.18mm, and select a work roller with a crown of 0mm.
[0048] S3 controls the rolling passes to be 9, and the deformation rates of the first to ninth passes are 24%, 18.7%, 16.8%, 15.2%, 14.6%, 13.8%, 13.2%, 12.9%, and 10%, respectively.
[0049] Control the unit tension before and after each pass, as shown in Table 3.
[0050] Table 3. Unit tension parameters before and after each pass of the rolling mill.
[0051] The surface roughness of the work rolls in the first to fourth passes is controlled to be 0.786 μm, and the surface roughness of the work rolls in the fifth to the finished product pass is controlled to be 0.163 μm.
[0052] S4, control the actual stress deviation values of the edge plate shape for the 1st to 3rd passes to be 40, 20, and 10 N / mm respectively. 2 The actual stress deviations of the middle plate were 40, 20, and 10 N / mm, respectively. 2 .
[0053] The actual stress deviation values of the edge plate shape for passes 4-9 were controlled to be 0, -10, -15, -20, -25, and -30 N / mm, respectively. 2 The actual stress deviations of the middle plate were 10, 15, 20, 25, 30, and 35 N / mm, respectively. 2 .
[0054] The plate shape measurement area is opened during rolling passes 1-7, and the plate shape measurement areas 13-16 and 30-33 are closed during rolling passes 8-finished. The operation side and the transmission side are closed symmetrically.
[0055] Before rolling, the transverse thickness of the steel coil is scanned. The thickness on the operating side is greater than that on the drive side, and the wedge ratio is 1.4%. An inclination compensation of 14 N / mm is added for the first three passes. 2 During rolling, the steel coil deviates by 3mm on the drive side, and the plate shape curve shifts by 3mm.
[0056] Tests showed that no deviation or strip breakage occurred during the rolling process, and the stability of the rolling process met expectations.
[0057] As can be seen from the above, the rolling control method has successfully solved the problems of roll deviation and strip breakage in wide-width, thin-gauge 300 series stainless steel rolling. The occurrence rate of roll deviation and strip breakage has been reduced from 5% to below 0.5%, significantly improving the product qualification rate and effectively reducing production costs, making it suitable for large-scale promotion.
[0058] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.
[0059] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.
[0060] 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 therein. 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, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A rolling control method for wide-width, thin-gauge 300 series stainless steel cold-rolled sheets, characterized in that, Includes the following steps: S1 controls the centering offset of the steel coil during feeding into the rolling mill; S2, Select the intermediate roll of the rolling mill according to the width of the coil; S3 controls the deformation rate, rolling passes, and work roll roughness parameters; S4 controls the actual stress deviation of the edge and middle plate shape.
2. The rolling control method according to claim 1, characterized in that, In S1: The centering offset of the steel coil during feeding is controlled to be 0-10mm.
3. The rolling control method according to claim 1, characterized in that, In S2: If rolling 300 series stainless steel cold-rolled sheets with a width of 1500-1600mm, then choose: An intermediate roller has a cone length of 250-270 mm and a cone length: cone height ratio of 1:0.0015-0.0025. Two intermediate rollers, with a crown of 0.15-0.25mm; The work roll has a crown of 0 mm.
4. The rolling control method according to claim 3, characterized in that, In S2: If rolling 300 series stainless steel cold-rolled sheets with a width of 1600-1650mm, then choose: An intermediate roller has a cone length of 150-170mm and a cone length: cone height ratio of 1:0.0020-0.0030. Two intermediate rollers, with a crown of 0.15-0.25mm; The work roll has a crown of 0 mm.
5. The rolling control method according to claim 1, characterized in that, In S3: The total deformation rate should be controlled at 75-85%; The rolling passes should be controlled to be 8-11. The roughness of the working roller is controlled to be 0.1-0.9μm.
6. The rolling control method according to claim 5, characterized in that, In S3: The deformation rate for the first pass should be controlled at 23-26%. The deformation rate of the finished product should be controlled at 9-12%.
7. The rolling control method according to claim 5, characterized in that, In S3: The initial unit tension for the first pass should be controlled at 260-280 N / mm. 2 The unit tension difference between the front and rear is 180-220 N / mm. 2 ; Control the pre-pass unit tension for passes 2-4 to be 320-340 N / mm 2 The unit tension difference between the front and rear is 5-10 N / mm. 2 ; Control the unit tension of the 5th pass before the finished product to be 340-350 mm. 2 The unit tension difference before and after is 10-15 N / mm. 2 ; The unit tension of the finished product pass should be controlled at 350-370 mm. 2 The unit tension difference between the front and rear is 25-35 N / mm. 2 .
8. The rolling control method according to claim 5, characterized in that, In S3: The surface roughness of the work rolls in the first four passes is controlled to be 0.7-0.9 μm; The surface roughness of the work rolls in the 5th to finished product pass is controlled to be 0.1-0.3 μm.
9. The rolling control method according to claim 1, characterized in that, In S4: The actual stress deviation of the edge plate shape in the first 1-3 passes should be controlled to be 10-80 N / mm. 2 The actual stress deviation of the middle plate is 10-80 N / mm. 2 ; The actual stress deviation of the edge plate shape in the 4th-finishing pass is controlled to be -60 to 0 N / mm. 2 The actual stress deviation within the range and in the middle of the plate is 10-80 N / mm. 2 .
10. The rolling control method according to claim 9, characterized in that, In S4: The plate shape measurement area is opened during the first 7 rolling passes, and the plate shape measurement areas 13-16 and 30-33 are closed during the 8th to the finished product rolling passes, with the operating side and the transmission side being closed symmetrically. Before rolling, the transverse thickness of the steel coil is scanned. When the thickness on the operating side is greater than that on the drive side and the wedge ratio is ≥1%, tilt compensation of 7-15 N / mm is added for the first 1-3 passes. 2 When the thickness on the transmission side is greater than that on the operating side and the wedge ratio is ≥1%, tilt compensation of -7-15 N / mm is added for the first 1-3 passes. 2 .