Asymmetric secondary cooling plate blank sectional electromagnetic stirring roller with magnetic poles

Abstract

The invention discloses an asymmetric magnetic pole type secondary cooling slab segmented electromagnetic stirring roller which is arranged on a fan-shaped section of a continuous casting machine, the two segmented electromagnetic stirring rollers are arranged in pairs, and the segmented electromagnetic stirring rollers are inner arc segmented electromagnetic stirring rollers and outer arc segmented electromagnetic stirring rollers which are the same in structure and are symmetrically installed on the two sides of a continuous casting slab; the inner arc segmented electromagnetic stirring rollers and the outer arc segmented electromagnetic stirring rollers are respectively mounted on the fan-shaped section inner arc frame and the fan-shaped section outer arc frame in pairs; each segmented electromagnetic stirring roller single roller comprises a long segmented roller and a short segmented roller; a long traveling wave magnetic field generator is arranged in the long segmented roller, and a short traveling wave magnetic field generator is arranged in the short segmented roller. The method is mainly used for slab continuous casting production with the slab width larger than 1800 mm and the slab thickness larger than 230 mm. The magnetic induction intensity is effectively improved by adding the magnetic poles at the traveling wave magnetic field generator of the electromagnetic stirring roller, the problem of insufficient electromagnetic force of the stirring roller is solved, and the core quality of a casting blank is improved.

Description

Technical Field

[0001] This invention relates to an asymmetric, magnetically poled, segmented electromagnetic stirring roller for secondary cooling slabs, belonging to the field of slab continuous casting production technology. Background Technology

[0002] During the continuous casting process, the secondary cooling zone mainly performs unidirectional cooling on the inner and outer arcs of the billet. This cooling method causes the internal crystal structure of the billet to exhibit dendritic crystals. These dendritic crystals are detrimental to the quality of the center of the continuously cast billet, easily leading to central porosity and central segregation, which in turn affects the rolling yield of the continuously cast billet and causes defects such as rolled skin and cracks.

[0003] In continuous casting processes where the slab width exceeds 1800mm, electromagnetic stirring rollers are required to improve center segregation and porosity in the slab. These rollers in the secondary cooling zone primarily utilize electromagnetic eddy current induction to generate a traveling wave magnetic field, promoting uniform heat dissipation between the solid and liquid phases of the slab, inhibiting dendritic crystal formation, and promoting equiaxed crystal formation, thereby improving center segregation and porosity. However, due to the large slab width, traditional through-roller electromagnetic stirring rollers cannot meet the structural rigidity requirements, frequently resulting in roller body deflection and damage during production. Summary of the Invention

[0004] To improve the yield of continuously cast slabs and avoid defects such as rolled skin and cracks, this invention provides an asymmetric magnetic pole type segmented electromagnetic stirring roller for secondary cooling slabs. It is mainly used in continuous casting production of wide slabs with a width greater than 1800mm and a thickness greater than 230mm to produce high-grade steels such as 400 series stainless steel, high carbon steel, and medium plates, so as to improve the center segregation and center porosity of the slab, thereby improving the slab yield.

[0005] This invention designs a segmented roller stirring structure, employing a long roller and a short roller. The traveling wave magnetic field generators within the long and short rollers are physically isolated from each other, but the coils of the traveling wave magnetic field generators are cooled by water entering from the long roller side and exiting from the short roller side. Furthermore, to enhance the magnetic field strength, a magnetic pole structure is added between the coils, effectively improving the magnetic performance. This invention completely solves the problems of insufficient rigidity of the through rollers in wide slab continuous casting machines, their inapplicability in engineering, and the insufficient magnetic performance after segmentation, effectively improving the center quality of the cast slab in continuous casting machines.

[0006] This invention provides an asymmetric magnetic pole type segmented electromagnetic stirring roller for secondary cooling slabs, which is mainly used for continuous casting production of slabs with a width greater than 1800mm and a thickness greater than 230mm.

[0007] This invention provides an asymmetric segmented electromagnetic stirring roller with magnetic poles for secondary cooling slabs, which is installed in the sector section of a continuous casting machine. The segmented electromagnetic stirring rollers are arranged in pairs, consisting of an inner arc segmented electromagnetic stirring roller and an outer arc segmented electromagnetic stirring roller with identical structures, symmetrically installed on both sides of the continuously cast slab. The inner arc segmented electromagnetic stirring roller and the outer arc segmented electromagnetic stirring roller are respectively installed on the inner arc frame and the outer arc frame of the sector section. Each segmented electromagnetic stirring roller includes a long segmented roller and a short segmented roller. Because the lengths of the long segmented roller and the short segmented roller are not equal, the problem of insufficient rigidity when using a through roller is solved.

[0008] The long segmented roller of the segmented electromagnetic stirring roller is connected to the long roller movable side bearing seat, the long roller transition terminal box and the long roller junction box on the left side. The long roller junction box adopts a positive pressure design to prevent water vapor from entering. The junction box contains the long roller positive pressure junction box and the long roller coil terminal at the tail. The stirring roller cooling water inlet pipe is connected to the long roller transition terminal box. The long segmented roller is connected to the short segmented roller through the long roller fixed side bearing seat and the short roller fixed side bearing seat. The short segmented roller is connected to the short roller movable side bearing seat, the short roller transition terminal box and the short roller junction box on the right side. The short roller junction box is connected to the short roller coil terminal and the short roller positive pressure junction box on the outside. The stirring roller cooling water return pipe is connected to the short roller transition terminal box. The internal structure of a segmented electromagnetic stirring roller includes: a roller end shaft, a long roller sleeve, a long traveling wave magnetic field generator, magnetic poles, a ball joint, a connecting ring, a water channel between the rollers, a short roller sleeve, and a short traveling wave magnetic field generator. The long traveling wave magnetic field generator has four magnetic poles and is installed in the core of the long roller sleeve, connected to the roller end shaft by bolts. The short traveling wave magnetic field generator has one magnetic pole and is installed in the core of the short roller sleeve, connected to the roller end shaft by bolts. The long roller sleeve and the short roller sleeve contact the cast billet, and the cast billet drives them to rotate.

[0009] The long segmented roller is equipped with a long traveling wave magnetic field generator, and the short segmented roller is equipped with a short traveling wave magnetic field generator. The formation of the traveling wave induced magnetic field of the asymmetric magnetic pole type segmented electromagnetic stirring roller for double-cooled slab mainly relies on four traveling wave magnetic field generators. The inner arc long traveling wave magnetic field generator and the outer arc long traveling wave magnetic field generator are connected in parallel to power supply and excite the magnetic field. The inner arc short traveling wave magnetic field generator and the outer arc short traveling wave magnetic field generator are also connected in parallel to power supply and excite the magnetic field.

[0010] Furthermore, each segmented electromagnetic stirring roller has a traveling wave magnetic field generator consisting of a long traveling wave magnetic field generator and a short traveling wave magnetic field generator, which are physically isolated from each other but cooled by the same cooling water. The cooling water enters the long and short traveling wave magnetic field generators from the stirring roller cooling inlet pipe, and heat exchange is achieved between the water and the traveling wave magnetic field generators. Then, it flows out through the stirring roller cooling return pipe. Each long roller traveling wave magnetic field generator includes five coils and two magnetic poles, using two-phase winding. Each short roller traveling wave magnetic field generator includes two coils and one magnetic pole.

[0011] The present invention relates to an asymmetric, magnetically poled, segmented electromagnetic stirring roller for secondary cooling slabs. These rollers need to be installed in pairs at the inlet or outlet of the sector section of a continuous casting machine. Generally, 2-3 pairs are installed on a single continuous casting machine. They are used to ensure the central porosity and central segregation of the slab when producing high-grade steels such as 400 series stainless steel, high carbon steel, and medium plates, so as to improve the central quality of the continuously cast slab.

[0012] This invention provides a method for using the above-mentioned asymmetric magnetic pole type segmented electromagnetic stirring roller for secondary cooling slabs, including the following steps: a pair of segmented electromagnetic stirring rollers are installed at the inlet or outlet of the fan-shaped section of the continuous casting machine. After being energized, the process conditions are controlled as follows: current is 350A and frequency is 6Hz. The traveling wave magnetic field generator generates a magnetic field, which causes the solid and liquid two-phase grains in the slab to dissipate heat evenly and form an equiaxed crystal structure, thereby improving the core quality of the slab.

[0013] The beneficial effects of this invention are: (1) When using a continuous casting machine with a width greater than 1800mm and a thickness greater than 230mm to produce high-grade steels such as 400 series stainless steel, high carbon steel, and medium plates, the problem of insufficient rigidity and insufficient stirring force of the rollers with the through roller structure should be solved. (2) By adding magnetic poles at the traveling wave magnetic field generator of the electromagnetic stirring roller, the magnetic induction intensity is effectively improved, which effectively solves the problem of insufficient electromagnetic force of the stirring roller and can be used for the electromagnetic stirring roller requirements of large thickness and wide cross section slab blanks. Attached Figure Description

[0014] Figure 1 A schematic diagram of the asymmetric, magnetically poled, double-sectioned electromagnetic stirring rollers installed in pairs on a secondary cooling slab. Figure 2 This is a structural diagram of a single-roller segmented electromagnetic stirring roller. Figure 3 A schematic diagram of the internal structure of a single segmented electromagnetic stirring roller. Figure 4 A schematic diagram of the electrical connection method for the paired installation of segmented electromagnetic stirring rollers and traveling wave magnetic field generators; Figure 5 A schematic diagram of the internal structure of the traveling wave magnetic field of a single segmented electromagnetic stirring roller; Figure 6 A schematic diagram of the connection method for the traveling wave magnetic field coil of the segmented electromagnetic stirring roller; In the diagram: 1. Inner arc frame of the sector segment; 2. Continuously cast billet; 3. Inner arc segmented electromagnetic stirring roller; 4. Outer arc segmented electromagnetic stirring roller; 5. Outer arc frame of the sector segment; 6. Long roller coil terminal; 7. Long roller junction box; 8. Long roller positive pressure junction box; 9. Stirring roller cooling water inlet pipe; 10. Long roller transition terminal box; 11. Long roller movable side bearing seat; 12. Long segmented roller; 13. Long roller fixed side bearing seat; 14. Short roller fixed side bearing seat; 15. Short segmented roller; 16. Short roller movable side bearing seat; 17. Short roller transition terminal box; 18. Stirring roller cooling water return pipe; 19. Short roller positive pressure junction box; 20. Short roller junction box; 21. Short roller coil terminal; 22. Roller end shaft; 23. Long roller sleeve. 4. Long traveling wave magnetic field generator; 25. Magnetic pole; 26. Ball joint; 27. Connecting ring; 28. Water channel between rollers; 29. ​​Short roller sleeve; 30. Short traveling wave magnetic field generator; 31. Inner arc long traveling wave magnetic field generator; 32. Inner arc short traveling wave magnetic field generator; 33. Outer arc long traveling wave magnetic field generator; 34. Outer arc short traveling wave magnetic field generator; 35. Long roller #1 coil; 36. Long roller #1 magnetic pole; 37. Long roller #2 coil; 38. Long roller #2 magnetic pole; 39. Long roller #3 coil; 40. Long roller #3 magnetic pole; 41. Long roller #4 coil; 42. Long roller #4 magnetic pole; 43. Long roller #5 coil; 44. Short roller #1 coil; 45. Short roller #1 magnetic pole; 46. Short roller #2 coil. Detailed Implementation

[0015] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, 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.

[0016] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0017] The present invention will be further illustrated by the following embodiments, but is not limited to the following embodiments. Example

[0018] like Figures 1-6As shown, an asymmetric magnetic pole type segmented electromagnetic stirring roller for secondary cooling slabs is mainly used for continuous casting production of slabs with a width greater than 1800mm and a thickness greater than 230mm.

[0019] This invention provides an asymmetric, magnetically poled, segmented electromagnetic stirring roller for a secondary cooling slab, installed in the sector section of a continuous casting machine. Two segmented electromagnetic stirring rollers are arranged in pairs, symmetrically installed on both sides of the continuously cast slab; for example... Figure 1 As shown, asymmetrical segmented electromagnetic stirring rollers with magnetic poles are arranged in pairs on both sides of the continuously cast billet 2. They are an inner arc segmented electromagnetic stirring roller 3 and an outer arc segmented electromagnetic stirring roller 4 with the same structure. They are respectively installed on the inner arc frame 1 and the outer arc frame 5 of the sector segment. Because the lengths of the long segmented roller and the short segmented roller are not equal, the problem of insufficient rigidity of the through roller is solved.

[0020] The specific structure of the segmented electromagnetic stirring roller is described below. Since the inner arc segmented electromagnetic stirring roller 3 and the outer arc segmented electromagnetic stirring roller 4 have the same structure, the following description is for a single segmented electromagnetic stirring roller.

[0021] like Figure 2 As shown, each segmented electromagnetic stirring roller includes: a long roller coil terminal 6, a long roller junction box 7, a long roller positive pressure junction box 8, a stirring roller cooling water inlet pipe 9, a long roller transition terminal box 10, a long roller movable side bearing seat 11, a long segmented roller 12, a long roller fixed side bearing seat 13, a short roller fixed side bearing seat 14, a short segmented roller 15, a short roller movable side bearing seat 16, a short roller transition terminal box 17, a stirring roller cooling water return pipe 18, a short roller positive pressure junction box 19, a short roller junction box 20, and a short roller coil terminal 21; the left side of the long segmented roller 12 of the segmented electromagnetic stirring roller is connected to the long roller movable side bearing seat 11, the long roller transition terminal box 10, and the long roller coil terminal 21. The long roller junction box 7 is designed with positive pressure inside, and nitrogen is introduced to prevent water vapor from entering. The long roller junction box 7 contains a long roller positive pressure junction box 8, and the tail end is provided with a long roller coil terminal 6. The cooling water inlet pipe 9 of the stirring roller is connected to the long roller transition terminal box 10. The long segmented roller 12 is connected to the short segmented roller 15 through the long roller fixed side bearing seat 13 and the short roller fixed side bearing seat 14. The right side of the short segmented roller 15 is connected to the short roller movable side bearing seat 16, the short roller transition terminal box 17 and the short roller junction box 20. The short roller junction box 20 is externally connected to the short roller coil terminal 21 and the short roller positive pressure junction box. The cooling water return pipe 18 of the stirring roller is connected to the short roller transition terminal box 17. like Figure 3As shown, the internal structure of a segmented electromagnetic stirring roller includes: a roller end shaft 22, a long roller sleeve 23, a long traveling wave magnetic field generator 24, magnetic poles 25, a ball joint 26, a connecting ring 27, a water channel between rollers 28, a short roller sleeve 29, and a short traveling wave magnetic field generator 30. The long traveling wave magnetic field generator 24 has four magnetic poles 25, which are installed in the core of the long roller sleeve 23 and connected to the roller end shaft 22 by bolts. The short traveling wave magnetic field generator 30 has one magnetic pole 25, which is installed in the core of the short roller sleeve 29 and connected to the roller end shaft 22 by bolts. The long roller sleeve 23 and the short roller sleeve 29 are in contact with the cast billet and are driven to rotate by the cast billet.

[0022] A long traveling wave magnetic field generator 24 is installed inside the long segmented roller 12, and a short traveling wave magnetic field generator 30 is installed inside the short segmented roller 15. Figure 4 As shown, the formation of the traveling wave induced magnetic field of the asymmetric magnetic pole type segmented electromagnetic stirring roller for double-cooled slabs mainly relies on four traveling wave magnetic field generators, including an inner arc long traveling wave magnetic field generator 31, an inner arc short traveling wave magnetic field generator 32, an outer arc long traveling wave magnetic field generator 33, and an outer arc short traveling wave magnetic field generator 34. Among them, the inner arc long traveling wave magnetic field generator 31 and the outer arc long traveling wave magnetic field generator 33 are powered and excited in parallel, and the inner arc short traveling wave magnetic field generator 32 and the outer arc short traveling wave magnetic field generator 34 are also powered and excited in parallel.

[0023] Furthermore, each segmented electromagnetic stirring roller has a traveling wave magnetic field generator comprising a long traveling wave magnetic field generator and a short traveling wave magnetic field generator, which are physically isolated from each other but cooled by the same cooling water. Cooling water enters the long traveling wave magnetic field generator 24 and the short traveling wave magnetic field generator 30 from the stirring roller cooling inlet pipe 9, achieving heat exchange between the water and the traveling wave magnetic field generators. Then, it flows out through the stirring roller cooling return pipe 18. Each long roller traveling wave magnetic field generator includes five coils and two... Each magnetic pole employs a two-phase winding structure, specifically including: long roller #1 coil 35, long roller #1 magnetic pole 36, long roller #2 coil 37, long roller #2 magnetic pole 38, long roller #3 coil 39, long roller #3 magnetic pole 40, long roller #4 coil 41, long roller #4 magnetic pole 42, and long roller #5 coil 43; each short roller traveling wave magnetic field generator includes two coils and one magnetic pole, specifically including: short roller #1 coil 44, short roller #1 magnetic pole 45, and short roller #2 coil 46. For example... Figure 5 As shown.

[0024] The winding method of long traveling wave magnetic field generator and short traveling wave magnetic field generator is as follows: Figure 6 . Figure 6In the design, the long traveling wave magnetic field generator contains 5 coils, with two phases wound (phase A and phase B with a phase angle of 90°), and the other coil is phase C (the common phase of phases A and B). The short traveling wave magnetic field generator contains 2 coils, with two phases wound (phase A and phase B with a phase angle of 90°), and the other coil is phase C (the common phase of phases A and B). The long and short traveling wave magnetic field generators operate independently and are physically isolated from each other. That is, the inner arc long traveling wave magnetic field generator 31 and the outer arc long traveling wave magnetic field generator 33 have the same coil winding method, and the inner arc short traveling wave magnetic field generator 32 and the outer arc short traveling wave magnetic field generator 34 have the same coil winding method.

[0025] The present invention relates to an asymmetric, magnetically poled, segmented electromagnetic stirring roller for secondary cooling slabs. These rollers need to be installed in pairs at the inlet or outlet of the sector section of a continuous casting machine. Generally, 2-3 pairs are installed on a single continuous casting machine. They are used to ensure the central porosity and central segregation of the slab when producing high-grade steels such as 400 series stainless steel, high carbon steel, and medium plates, so as to improve the central quality of the continuously cast slab.

[0026] This invention provides a method for using the above-mentioned asymmetric magnetic pole type segmented electromagnetic stirring rollers for secondary cooling slabs, including the following steps: two pairs of segmented electromagnetic stirring rollers are installed at the inlet or outlet of the fan-shaped section of the continuous casting machine. After being energized, the process conditions are controlled as follows: current is 350A and frequency is 6Hz. The traveling wave magnetic field generator generates a magnetic field, which causes the solid and liquid two-phase grains in the slab to dissipate heat evenly and form an equiaxed crystal structure, thereby improving the core quality of the slab.

[0027] Application process: The aforementioned asymmetric, magnetically-pole-equipped, segmented electromagnetic stirring rollers for secondary cooling slabs were used in a continuous casting machine, specifically at the inlet of section 2 and the outlet of section 3 of the secondary cooling arc section. Two pairs of these rollers were installed respectively for producing high-carbon steel, medium plates, silicon steel, and other steel grades requiring high central quality of the cast billet. The implementation conditions were: current 350A and frequency 6Hz. After trial use, this technical solution met the central quality requirements for the aforementioned steel grades.

[0028] Generally, asymmetrical electromagnetic stirring rollers with magnetic poles are installed in pairs at the inlet or outlet of the continuous casting machine. At least two sets are installed in the continuous casting machine, respectively set on the upper and lower sides of the continuously cast billet. After the current is applied, the "stirring" of the solid and liquid two-phase regions of the billet is achieved, thereby improving the quality of the center of the billet.

Claims

1. An asymmetric, magnetically poled, segmented electromagnetic stirring roller for secondary cooling slabs, installed in the sector section of a continuous casting machine, characterized in that: Two segmented electromagnetic stirring rollers are arranged in pairs, consisting of an inner arc segmented electromagnetic stirring roller and an outer arc segmented electromagnetic stirring roller with identical structures, symmetrically installed on both sides of the continuous casting billet. The inner arc segmented electromagnetic stirring roller and the outer arc segmented electromagnetic stirring roller are respectively installed on the inner arc frame and the outer arc frame of the sector segment. Each segmented electromagnetic stirring roller includes a long segmented roller and a short segmented roller. The left side of the long segmented roller of each segmented electromagnetic stirring roller is connected to the long roller movable side bearing seat, the long roller transition terminal box, and the long roller junction box. Inside the long roller junction box... The unit adopts a positive pressure design to prevent moisture from entering. The junction box contains a long roller positive pressure junction box, and the tail end has a long roller coil terminal. The cooling water inlet pipe of the stirring roller is connected to the long roller transition terminal box. The long segmented roller is connected to the short segmented roller through the long roller fixed side bearing seat and the short roller fixed side bearing seat. The right side of the short segmented roller is connected to the short roller movable side bearing seat, the short roller transition terminal box and the short roller junction box. The short roller junction box is externally connected to the short roller coil terminal and the short roller positive pressure junction box. The cooling water return pipe of the stirring roller is connected to the short roller transition terminal box. Each segmented electromagnetic stirring roller has a traveling wave magnetic field generator consisting of a long traveling wave magnetic field generator and a short traveling wave magnetic field generator. The long traveling wave magnetic field generator is located inside the long segmented roller, and the short traveling wave magnetic field generator is located inside the short segmented roller.

2. The asymmetric segmented electromagnetic stirring roller with magnetic poles for secondary cooling slabs according to claim 1, characterized in that: The internal structure of a segmented electromagnetic stirring roller includes: a roller end shaft, a long roller sleeve, a long traveling wave magnetic field generator, magnetic poles, a ball joint, a connecting ring, a water channel between rollers, a short roller sleeve, and a short traveling wave magnetic field generator. The long traveling wave magnetic field generator has four magnetic poles, which are installed in the core of the long roller sleeve and connected to the roller end shaft by bolts. The short traveling wave magnetic field generator has one magnetic pole, which is installed in the core of the short roller sleeve and connected to the roller end shaft by bolts.

3. The asymmetric segmented electromagnetic stirring roller with magnetic poles for secondary cooling slabs according to claim 2, characterized in that: The long and short roller sleeves come into contact with the cast billet, and are driven to rotate by the cast billet.

4. The asymmetric segmented electromagnetic stirring roller with magnetic poles for secondary cooling slabs according to claim 1, characterized in that: The formation of the traveling wave induced magnetic field of the asymmetric magnetic pole type segmented electromagnetic stirring roller for double-cooled slabs mainly relies on four traveling wave magnetic field generators. The inner arc long traveling wave magnetic field generator and the outer arc long traveling wave magnetic field generator are connected in parallel to power supply and excite the magnetic field. The inner arc short traveling wave magnetic field generator and the outer arc short traveling wave magnetic field generator are also connected in parallel to power supply and excite the magnetic field.

5. The asymmetric segmented electromagnetic stirring roller with magnetic poles for secondary cooling slabs according to claim 4, characterized in that: The long traveling wave magnetic field generator and the short traveling wave magnetic field generator are physically isolated and cooled by the same cooling water. The cooling water enters the long traveling wave magnetic field generator and the short traveling wave magnetic field generator from the cooling water inlet pipe of the stirring roller, and heat exchange is achieved between the water and the traveling wave magnetic field generator. Then, it flows out through the cooling water return pipe of the stirring roller.

6. The asymmetric segmented electromagnetic stirring roller with magnetic poles for secondary cooling slabs according to claim 5, characterized in that: Each long-roll traveling wave magnetic field generator includes five coils and two magnetic poles, employing two-phase winding. Each short-roll traveling wave magnetic field generator includes two coils and one magnetic pole.

7. The asymmetric segmented electromagnetic stirring roller with magnetic poles for secondary cooling slabs according to claim 1, characterized in that: The asymmetric electromagnetic stirring rollers with magnetic poles for the second cooling slab segment need to be installed in pairs at the inlet or outlet of the fan-shaped section of the continuous casting machine, with 2-3 pairs installed on one continuous casting machine.

8. A method of using the asymmetric magnetic pole type segmented electromagnetic stirring roller for secondary cooling slabs as described in any one of claims 1 to 7, characterized in that... The process includes the following steps: A pair of segmented electromagnetic stirring rollers are installed at the inlet or outlet of the sector section of the continuous casting machine. After powering on, the process conditions are controlled as follows: current is 350A and frequency is 6Hz. The traveling wave magnetic field generator generates a magnetic field, which causes the solid and liquid two-phase grains in the billet to dissipate heat evenly and form an equiaxed crystal structure, thereby improving the quality of the billet core.

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