Method for controlling cross bending defects of hot-rolled strip steel
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TANGSHAN COLLEGE
- Filing Date
- 2022-06-30
- Publication Date
- 2026-06-26
Smart Images
Figure CN115121627B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hot-rolled strip steel production technology, and in particular to a method for controlling transverse bending defects in hot-rolled strip steel. Background Technology
[0002] Hot-rolled strip steel is widely used in various sectors of the national economy, including military, automobile manufacturing, chemical, and machinery industries, and is one of the most technically challenging products in steel production. Strip shape is a crucial indicator of the dimensional accuracy of hot-rolled strip steel. Its control process is characterized by nonlinearity, large hysteresis, and strong coupling, which has become a bottleneck restricting the improvement of hot-rolled strip steel quality. Poor strip shape quality not only affects the product yield of downstream processes but can also cause production accidents in severe cases. The microstructure and properties of hot-rolled strip steel are regulated by a laminar flow cooling system located from the finishing mill exit to coiling. During this stage, the strip steel experiences significant temperature changes. Changes in volume and expansion coefficient caused by thermal expansion and phase transformation can easily lead to differences in expansion between the upper and lower surfaces of the strip steel, resulting in transverse bending defects.
[0003] However, most existing strip shape control methods target longitudinal strip shape defects, and there are few methods to improve transverse bending defects in strip. Therefore, it is essential to design a method for controlling transverse bending defects in hot-rolled strip. Summary of the Invention
[0004] The purpose of this invention is to provide a method for controlling transverse bending defects in hot-rolled strip steel, which can improve the transverse bending shape defects of hot-rolled strip steel and is easy to implement.
[0005] To achieve the above objectives, the present invention provides the following solution:
[0006] A method for controlling transverse bending defects in hot-rolled strip steel includes the following steps:
[0007] Step 1: Collect the transverse bending value of the first coil of strip steel and classify the first coil of strip steel according to the transverse bending value;
[0008] Step 2: Based on the classification results, different cooling water flow rates are set between the upper and lower surfaces of the first coil of strip steel for different types to improve the situation;
[0009] Step 3: Measure the transverse bending value of the first coil of strip after the improvement is completed. If it meets the quality requirements of the finished strip, maintain the set value of the cooling water flow difference. If it does not meet the requirements, increase the set value of the cooling water flow difference between the upper and lower plates by 10%, and measure the transverse bending value of the first coil of strip after the second improvement is completed until it meets the quality requirements of the strip.
[0010] Optionally, in step 1, the transverse bending value of the first coil of strip is collected, and the first coil of strip is classified according to the transverse bending value, specifically as follows:
[0011] Collect the transverse bending value of the first roll of strip steel. a ,like mm, then the first roll of strip steel is marked as Class A, if a If the thickness is 10 to 20 mm, then the first coil of strip steel is marked as Class B. a If the thickness is 20 to 30 mm, then the first coil of strip steel should be marked as Class C. a If the thickness is 30 to 50 mm, then the first coil of strip should be marked as Class D. If the thickness is mm, then the first roll of strip steel is marked as Class E.
[0012] Optionally, in step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the performance of the first coil of strip steel in category A. Specifically:
[0013] If the first coil of strip is of type A, then collect the thickness and width specifications of the first coil of strip. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then set the cooling water flow rate difference between the upper and lower surfaces to 150 m³ / h. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 180 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 220 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 260 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 310m. 3 / h;
[0014] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 190m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 230 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 280 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 330 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 390m. 3 / h;
[0015] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 240m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 290 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 340 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 390 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 440m. 3 / h;
[0016] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 300m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 360 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 500 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 580m³ / h. 3 / h;
[0017] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow difference between the upper and lower plates should be set to 350m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 420 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 490 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 570 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 660m³ / h. 3 / h.
[0018] Optionally, in step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the performance of the first coil of strip steel in category B. Specifically:
[0019] If the first coil of strip is of type B, then collect the thickness and width specifications of the first coil of strip. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then set the cooling water flow rate difference between the upper and lower surfaces to 190 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 220 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 260 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 300 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 350m. 3 / h;
[0020] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 230m³ / h. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 270 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 320 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 370 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 430m. 3 / h;
[0021] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 280m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 330 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 380 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 480m. 3 / h;
[0022] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow difference between the upper and lower plates should be set to 340m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 400 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 470 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 540 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 620m³ / h. 3 / h;
[0023] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow difference between the upper and lower plates should be set to 390m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 460 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 530 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 610 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 700m. 3 / h.
[0024] Optionally, in step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the performance of the first coil of strip steel in category C. Specifically:
[0025] If the first coil of strip is of type C, then collect the thickness and width specifications of the first coil of strip. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then set the cooling water flow rate difference between the upper and lower surfaces to 240 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 270 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 310 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 350 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 400m. 3 / h;
[0026] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 280m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 320 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 370 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 420 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 480m. 3 / h;
[0027] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 330m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 380 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 480 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 530m³ / h. 3 / h;
[0028] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow difference between the upper and lower plates should be set to 390m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 450 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 520 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 590 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 670m. 3 / h;
[0029] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 440m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 510 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 580 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 660 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 750m. 3 / h.
[0030] Optionally, in step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the performance of the first coil of strip steel in category D. Specifically:
[0031] If the first coil of strip is of type D, then collect the thickness and width specifications of the first coil of strip. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then set the cooling water flow rate difference between the upper and lower surfaces to 350 m³ / h. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 380 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 420 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 460 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 510m³ / h. 3 / h;
[0032] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 390m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 480 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 530 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 590m. 3 / h;
[0033] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 440m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 490 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 540 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 590 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 640m. 3 / h;
[0034] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 500m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 560 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 630 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 700 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 780m³ / h. 3 / h;
[0035] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow difference between the upper and lower plates should be set to 550m³ / s. 3 / h; If the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 620 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 690 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 770 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 860m. 3 / h.
[0036] Optionally, in step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the performance of the first coil of strip steel in category E. Specifically:
[0037] If the first coil of strip is of type E, then collect the thickness and width specifications of the first coil of strip. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then set the cooling water flow rate difference between the upper and lower surfaces to 500 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower plates is set to 530 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 570 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 610 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 660m³ / h. 3 / h;
[0038] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 540m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 580 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 630 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 680 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 740m³ / h. 3 / h;
[0039] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 590m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 640 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 690 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 740 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 790m³ / h. 3 / h;
[0040] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow difference between the upper and lower plates should be set to 650m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 710 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 780 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 850 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 930m³ / h. 3 / h;
[0041] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 700m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 770 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 840 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 920 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 1010m³ / h. 3 / h.
[0042] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects: The method for controlling transverse bending defects in hot-rolled strip steel provided by the present invention includes collecting the transverse bending value of the first coil of strip steel, classifying the first coil of strip steel according to the transverse bending value, setting different cooling water flow differences between the upper and lower plates for different types of first coil of strip steel according to the classification results, improving the quality, measuring the transverse bending value of the first coil of strip steel after improvement, and if it meets the quality requirements of the finished strip steel, maintaining the set value of the cooling water flow difference; if it does not meet the requirements, increasing the set value of the cooling water flow difference between the upper and lower plates by 10%, and measuring the transverse bending value of the first coil of strip steel after secondary improvement until it meets the quality requirements of the strip steel; the method can improve the transverse bending defects in hot-rolled strip steel, so that the finished strip steel meets the quality requirements. The method only changes the cooling water flow difference between the upper and lower plates, which is easy to implement. Attached Figure Description
[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0044] Figure 1 This is a schematic diagram of the process for controlling transverse bending defects in hot-rolled strip steel according to an embodiment of the present invention;
[0045] Figure 2 This is a schematic diagram of a transverse bending defect in hot-rolled strip steel. Detailed Implementation
[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.
[0047] The purpose of this invention is to provide a method for controlling transverse bending defects in hot-rolled strip steel, which can improve the transverse bending shape defects of hot-rolled strip steel and is easy to implement.
[0048] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0049] like Figure 1 As shown in the embodiment of the present invention, the method for controlling transverse bending defects in hot-rolled strip steel includes the following steps:
[0050] Step 1: Collect the transverse bending value of the first coil of strip steel and classify the first coil of strip steel according to the transverse bending value;
[0051] Step 2: Based on the classification results, different cooling water flow rates are set for the upper and lower surfaces of the first coil of strip steel of different types to improve the situation;
[0052] Step 3: Measure the transverse bending value of the first coil of strip after the improvement is completed. If it meets the quality requirements of the finished strip, maintain the set value of the cooling water flow difference. If it does not meet the requirements, increase the set value of the cooling water flow difference between the upper and lower plates by 10%, and measure the transverse bending value of the first coil of strip after the second improvement is completed until it meets the quality requirements of the strip.
[0053] In step 1, the transverse bending value of the first coil of strip is collected, and the first coil of strip is classified according to the transverse bending value, specifically as follows:
[0054] Collect the transverse bending value of the first roll of strip steel. a ,like mm, then the first roll of strip steel is marked as Class A, if a If the thickness is 10 to 20 mm, then the first coil of strip steel is marked as Class B. a If the thickness is 20 to 30 mm, then the first coil of strip should be marked as Class C. a If the thickness is 30 to 50 mm, then the first coil of strip should be marked as Class D. If the thickness is mm, then the first coil of strip steel is marked as Class E, as shown in Table 1.
[0055] Table 1 Classification of Transverse Bending Values
[0056]
[0057] In step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the first coil of strip steel in category A. Specifically:
[0058] Table 2. Set values for cooling water flow rate difference for Class A transverse bends (m) 3 / h)
[0059]
[0060] As shown in Table 2, if the first coil of strip is of type A, then the thickness and width specifications of the first coil of strip are collected. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then the difference in cooling water flow rate between the upper and lower surfaces is set to 150 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 180 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 220 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 260 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 310m. 3 / h;
[0061] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 190m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 230 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 280 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 330 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 390m. 3 / h;
[0062] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 240m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 290 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 340 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 390 m³ / h.3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 440m. 3 / h;
[0063] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 300m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 360 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 500 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 580m³ / h. 3 / h;
[0064] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow difference between the upper and lower plates should be set to 350m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 420 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 490 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 570 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 660m³ / h. 3 / h.
[0065] In step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the first coil of strip steel in category B. Specifically:
[0066] Table 3. Set values for cooling water flow rate difference for Class B transverse bends (m) 3 / h)
[0067]
[0068] As shown in Table 3, if the first coil of strip is of type B, then the thickness and width specifications of the first coil of strip are collected. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then the difference in cooling water flow rate between the upper and lower surfaces is set to 190 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 220 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 260 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 300 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 350m. 3 / h;
[0069] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 230m³ / h. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 270 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 320 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 370 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 430m. 3 / h;
[0070] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 280m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 330 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 380 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 480m.3 / h;
[0071] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow difference between the upper and lower plates should be set to 340m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 400 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 470 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 540 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 620m. 3 / h;
[0072] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow difference between the upper and lower plates should be set to 390m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 460 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 530 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 610 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 700m. 3 / h.
[0073] In step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the first coil of strip steel in category C. Specifically:
[0074] Table 4. Set values for cooling water flow rate difference for Class C transverse bends (m) 3 / h)
[0075]
[0076] As shown in Table 4, if the first coil of strip is of type C, then the thickness and width specifications of the first coil of strip are collected. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower surfaces is set to 240 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 270 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 310 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 350 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 400m. 3 / h;
[0077] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 280m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 320 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 370 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 420 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 480m. 3 / h;
[0078] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 330m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 380 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 480 m³ / h. 3 / h; if the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 530m³ / h. 3 / h;
[0079] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow difference between the upper and lower plates should be set to 390m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 450 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 520 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 590 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 670m. 3 / h;
[0080] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 440m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 510 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 580 m³ / h. 3 / h; If the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 660 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 750m. 3 / h.
[0081] In step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the first coil of strip steel in category D. Specifically:
[0082] Table 5. Set values for cooling water flow rate difference for Class D transverse bends (m) 3 / h)
[0083]
[0084] As shown in Table 5, if the first coil of strip is of type D, then the thickness and width specifications of the first coil of strip are collected. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower surfaces is set to 350 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 380 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 420 m³ / h.3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates should be set to 460 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 510m³ / h. 3 / h;
[0085] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 390m³. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 430 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 480 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 530 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 590m. 3 / h;
[0086] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 440m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 490 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 540 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 590 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 640m. 3 / h;
[0087] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 500m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 560 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 630 m³ / h.3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 700 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 780m³ / h. 3 / h;
[0088] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow difference between the upper and lower plates should be set to 550m³ / s. 3 / h; If the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 620 m³ / h. 3 / h; If the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 690 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 770 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 860m. 3 / h.
[0089] In step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the first coil of strip steel in category E. Specifically:
[0090] Table 6. Set values for cooling water flow rate difference for Class E transverse bends (m) 3 / h)
[0091]
[0092] As shown in Table 6, if the first coil of strip is of type E, then the thickness and width specifications of the first coil of strip are collected. If the width is less than or equal to 1000 mm and the thickness is less than or equal to 5 mm, then the difference in cooling water flow rate between the upper and lower surfaces is set to 500 m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is less than or equal to 5 mm, then the cooling water flow rate difference between the upper and lower plates is set to 530 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 570 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is less than or equal to 5 mm, then the cooling water flow difference between the upper and lower plates is set to 610 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is less than or equal to 5mm, then the cooling water flow difference between the upper and lower plates is set to 660m³ / h. 3 / h;
[0093] If the width is less than or equal to 1000mm and the thickness is 5 to 10mm, the cooling water flow difference between the upper and lower plates should be set to 540m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 5 to 10 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 580 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 630 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 5 to 10 mm, then the cooling water flow difference between the upper and lower plates should be set to 680 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 5 to 10mm, then the cooling water flow difference between the upper and lower plates is set to 740m³ / h. 3 / h;
[0094] If the width is less than or equal to 1000mm and the thickness is 10 to 15mm, the cooling water flow difference between the upper and lower plates should be set to 590m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 640 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 690 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 10 to 15 mm, then the cooling water flow difference between the upper and lower plates should be set to 740 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 10 to 15mm, then the cooling water flow difference between the upper and lower plates is set to 790m³ / h. 3 / h;
[0095] If the width is less than or equal to 1000mm and the thickness is 15 to 20mm, the cooling water flow difference between the upper and lower plates should be set to 650m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 710 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 780 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is 15 to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 850 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is 15 to 20mm, then the cooling water flow difference between the upper and lower plates is set to 930m³ / h. 3 / h;
[0096] If the width is less than or equal to 1000mm and the thickness is greater than or equal to 20mm, the cooling water flow rate difference between the upper and lower plates should be set to 700m³ / s. 3 / h; if the width is 1000 to 1200 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow rate difference between the upper and lower plates should be set to 770 m³ / h. 3 / h; if the width is 1200 to 1500 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 840 m³ / h. 3 / h; if the width is 1500 to 1800 mm and the thickness is greater than or equal to 20 mm, then the cooling water flow difference between the upper and lower plates should be set to 920 m³ / h. 3 / h; If the width is greater than or equal to 1800mm and the thickness is greater than or equal to 20mm, then the cooling water flow difference between the upper and lower plates is set to 1010m³ / h. 3 / h.
[0097] One embodiment of the present invention is as follows: Taking a hot continuous rolling production line as an example, its laminar flow cooling is divided into four process sections: ultra-fast cooling, rough adjustment, densification and fine adjustment. The equipment parameters of each section are shown in Table 7.
[0098] Table 7 Parameters of Laminar Flow Cooling Equipment for Hot Continuous Rolling Production Line
[0099]
[0100] Example 1: Hot-rolled strip steel with a thickness of 5 mm and a width of 950 mm was prepared and then cooled by laminar flow to produce 700L beam steel with a tensile strength of not less than 700 MPa. Measurements showed that the first coil of strip steel produced... a The value is 8 mm. According to Table 2, the cooling water flow difference for the next coil of strip should be set to 150 m. 3 / h, after measurement, it was found that after applying the control method of the present invention, the transverse bending value of the strip in Example 1 was reduced from 8 mm to 2 mm.
[0101] Example 2: Hot-rolled strip steel with a thickness of 8 mm and a width of 1150 mm was prepared and cooled by laminar flow to produce SPA-H weathering steel with a tensile strength of not less than 490 MPa. Measurements showed that the first coil of strip steel produced... a The value is 12 mm. According to Table 3, the cooling water flow difference for the next coil of strip should be set to 270 m. 3 / h, after measurement, it was found that after applying the control method of the present invention, the transverse bending value of the strip in Example 2 was reduced from 12 mm to 6 mm.
[0102] Example 3: Hot-rolled strip steel with a thickness of 13 mm and a width of 1300 mm was prepared and cooled by laminar flow to produce 380CL wheel steel with a tensile strength of not less than 380 MPa. Measurements showed that the first coil of strip steel... a The value is 24 mm. According to Table 4, the cooling water flow rate difference for the next coil of strip should be set to 430 m. 3 / h, after measurement, it was found that after applying the control method of the present invention, the transverse bending value of the strip in Example 3 was reduced from 24 mm to 8 mm.
[0103] Example 4: Hot-rolled strip steel with a thickness of 18 mm and a width of 1700 mm was prepared and cooled by laminar flow to produce X65M pipeline steel with a tensile strength of not less than 450 MPa. Measurements showed that the first coil of strip steel... a The value is 38 mm. According to Table 5, the cooling water flow rate difference for the next coil of strip should be set to 700 m. 3 / h, after measurement, it was found that after applying the control method of the present invention, the transverse bending value of the strip in Example 1 was reduced from 38 mm to 9 mm.
[0104] Example 5: Hot-rolled strip steel with a thickness of 24 mm and a width of 2000 mm was prepared and cooled by laminar flow to produce X80M pipeline steel with a tensile strength of not less than 560 MPa. Measurements showed that the first coil of strip steel... a The value is 53 mm. According to Table 6, the cooling water flow rate difference for the next coil of strip should be set to 1010 m³. 3 / h, after measurement, it was found that after applying the control method of the present invention, the transverse bending value of the strip in Example 1 was reduced from 53 mm to 9 mm.
[0105] The schematic diagram of transverse bending defects in hot-rolled strip steel is shown below. Figure 2 As shown.
[0106] The present invention provides a method for controlling transverse bending defects in hot-rolled strip steel. This method includes collecting the transverse bending value of the first coil of strip steel, classifying the first coil of strip steel according to the transverse bending value, setting different cooling water flow differences between the upper and lower surfaces for different types of first coil of strip steel based on the classification results, and measuring the transverse bending value of the first coil of strip steel after improvement. If the value meets the quality requirements of the finished strip steel, the set value of the cooling water flow difference is maintained; if not, the value is increased by 10% based on the original set value of the cooling water flow difference between the upper and lower surfaces. The transverse bending value of the first coil of strip steel after the second improvement is measured until it meets the quality requirements of the strip steel. This method can improve the transverse bending defects of hot-rolled strip steel, ensuring that the finished strip steel meets quality requirements. This method only changes the cooling water flow difference between the upper and lower surfaces, making it easy to implement.
[0107] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A method for controlling transverse bending defects in hot-rolled strip steel, characterized in that, Includes the following steps: Step 1: Collect the transverse bending value of the first coil of strip steel and classify the first coil of strip steel according to the transverse bending value; Step 2: Based on the classification results, different cooling water flow rates are set for the upper and lower surfaces of the first coil of strip steel of different types to improve the situation; Step 3: Measure the transverse bending value of the first coil of strip after the improvement is completed. If it meets the quality requirements of the finished strip, maintain the set value of the cooling water flow difference. If it does not meet the requirements, increase the set value of the cooling water flow difference between the upper and lower plates by 10% and measure the transverse bending value of the first coil of strip after the second improvement is completed until it meets the quality requirements of the strip. In step 1, the transverse bending value of the first coil of strip is collected, and the first coil of strip is classified according to the transverse bending value, specifically as follows: Collect the transverse bending value of the first roll of strip steel. a ,like mm, then the first roll of strip steel is marked as Class A, if a If the thickness is 10 to 20 mm, then the first coil of strip steel is marked as Class B. a If the thickness is 20 to 30 mm, then the first coil of strip should be marked as Class C. a If the thickness is 30 to 50 mm, then the first coil of strip should be marked as Class D. If the value is mm, then the first roll of strip steel is marked as Class E. In step 2, based on the classification results, a difference in cooling water flow between the upper and lower plates is set to improve the first coil of strip steel in category A. Specifically: Improvements were made to the first coil of strip steel in category B, specifically as follows: Improvements were made to the first coil of strip steel in category C, specifically as follows: Improvements were made to the first coil of strip steel in category D, specifically as follows: Improvements were made to the first coil of strip steel in category E, specifically as follows: The unit for the set value of the cooling water flow difference for various transverse bend values is: m. 3 / h.