A sector for an electromagnetic stirring device of a thin slab
By using a sector-shaped device with a triple electromagnetic stirring section in CSP continuous casting and rolling technology, the corrugation defect of medium and high grade non-oriented silicon steel was solved, achieving high-efficiency production, improving the equiaxed crystal ratio of the billet, and solving the problem of low production cost but no price advantage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUNAN ZHONGKE ELECTRIC CO LTD
- Filing Date
- 2022-12-06
- Publication Date
- 2026-06-02
AI Technical Summary
When producing high-grade non-oriented silicon steel, CSP continuous casting and rolling technology is prone to corrugation defects, which are difficult to solve effectively with existing technologies. This results in low production costs but no price advantage, and domestic production lines are in an unsaturated state.
A sector-shaped section with an electromagnetic stirring device for thin slabs is adopted, comprising three electromagnetic stirring sections. The slab is stirred three times by electromagnetic stirrers of different modes to form equiaxed crystals. Specifically, it includes a first, second and third electromagnetic stirring section, which provides electromagnetic field strengths of 600Gs, 800Gs and 1200Gs respectively, and is used in conjunction with non-magnetic rollers and free rollers for stirring.
It effectively solved the corrugation defect problem of medium and high grade non-oriented silicon steel, and the equiaxed crystal ratio of the cast billet reached more than 50%, improving the quality and efficiency of CSP production.
Smart Images
Figure CN115722639B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of continuous casting metallurgy, and particularly relates to a sector-shaped section for thin slabs with an electromagnetic stirring device. Background Technology
[0002] Traditional steelmaking typically separates casting and rolling, but this method is extremely energy-intensive, neither economical nor environmentally friendly. Therefore, continuous casting and rolling (CSP) technology emerged. Compared to traditional steelmaking, this technology can reduce energy consumption by more than 20%. However, the thickness of the cast billet is generally 50-90mm. At high casting speeds, this can lead to internal quality defects, especially in the production of non-oriented silicon steel, where columnar crystals are highly developed and equiaxed crystals are almost nonexistent. For medium- and high-grade non-oriented silicon steel, the lack of equiaxed crystals results in corrugated defects in the finished coils.
[0003] Because the corrugation defect problem of medium and high grade non-oriented silicon steel cannot be solved, CSP continuous casting and rolling technology is in a bottleneck period. Although the production cost is low, it can only produce low grade non-oriented silicon steel, and the price is not competitive, resulting in several domestic CSP production lines being in an unsaturated state. Summary of the Invention
[0004] The purpose of this invention is to provide a sector-shaped section for thin slabs with an electromagnetic stirring device to solve the corrugation defect problem of medium and high grade non-oriented silicon steel.
[0005] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:
[0006] A fan-shaped section for thin slabs with an electromagnetic stirring device, the fan-shaped section includes a fan-shaped section body, the fan-shaped section body includes a first frame and a second frame arranged opposite to each other, and the space between the first frame and the second frame is a channel for the movement of the casting slab.
[0007] The fan-shaped section body includes a first electromagnetic stirring section at the inlet, a third electromagnetic stirring section at the outlet, and a second electromagnetic stirring section between the first and third electromagnetic stirring sections. At least one set of free rollers is provided on both sides of the billet moving channel between the first and second electromagnetic stirring sections, and at least one set of free rollers is provided on both sides of the billet moving channel between the second and third electromagnetic stirring sections.
[0008] The first electromagnetic stirring section includes a first electromagnetic stirrer mounted on a second frame. A non-magnetic roller is mounted on one side of the billet moving channel within the first electromagnetic stirring section, and a free roller is mounted on the other side. The non-magnetic roller and the first electromagnetic stirrer are mounted on the same frame.
[0009] The second electromagnetic stirring section includes a second electromagnetic stirrer disposed on both sides of the billet moving channel within the second electromagnetic stirring section. The second electromagnetic stirrer is a roller-shaped structure with the same shape as the free roller.
[0010] The third electromagnetic stirring section includes a third electromagnetic stirrer disposed on both sides of the billet moving channel within the third electromagnetic stirring section. The third electromagnetic stirrer is a roller-shaped structure with the same shape as the free roller.
[0011] Thus, the billet enters the first electromagnetic stirring section from the moving channel. The first electromagnetic stirrer in this section is installed on one side, and it, along with its cooperating non-magnetic roller and free roller, provides initial stirring for the molten steel entering the fan-shaped region. The billet then enters the second electromagnetic stirring section, where the second electromagnetic stirrer requires a smaller electromagnetic field and serves as an auxiliary stirrer. Finally, the billet arrives at the third electromagnetic stirring section, where the third electromagnetic stirrer plays the primary stirring role, requiring very high electromagnetic strength to break up dendrites and form equiaxed crystals. This invention, through triple stirring of the billet in the fan-shaped section, forms equiaxed crystals, thus solving the quality defects of high-grade non-oriented silicon steel corrugated steel in CSP production.
[0012] Furthermore, the electromagnetic field X acting on the center of the billet by the first electromagnetic stirrer is ≥600Gs; the electromagnetic field X acting on the center of the billet by the second electromagnetic stirring section is ≤800Gs; and the electromagnetic field X acting on the center of the billet by the third electromagnetic stirrer is ≥1200Gs.
[0013] Furthermore, the roller diameter of the second electromagnetic stirrer is 130-160mm; the roller diameter of the third electromagnetic stirrer is 160-200mm; the non-magnetic roller is made of non-magnetic material and serves to support the casting billet. Generally, closely spaced rollers are used, and their roller diameter is 90-110mm.
[0014] Furthermore, the effective electromagnetic field coverage area S of the first electromagnetic stirring section is at least:
[0015] S = K × H,
[0016] In the formula, K is the cross-sectional width of the billet; H is the length of the billet's moving channel within the first electromagnetic stirring section, and the value of H is H≥600mm.
[0017] Furthermore, the free rollers on both sides of the billet moving channel are symmetrically arranged; the non-magnetic rollers and free rollers of the first electromagnetic stirring section are symmetrically arranged; the second electromagnetic stirrer is symmetrically arranged; and the third electromagnetic stirrer is symmetrically arranged.
[0018] The fan-shaped section with electromagnetic stirring device for thin slabs of the present invention has the following advantages: the slab is subjected to triple electromagnetic stirring through three different modes of electromagnetic stirring sections to form equiaxed crystals, thus solving the quality defects of high-grade non-oriented silicon steel corrugated steel in CSP production. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the fan-shaped segment body structure of the present invention;
[0020] Figure 2 This is a schematic cross-sectional view of the fan-shaped segment body of the present invention.
[0021] The markings in the diagram are as follows: 1. Cast billet; 2. Non-magnetic roller; 3. First frame; 4. Second electromagnetic stirrer on the outer arc side; 5. Second electromagnetic stirrer on the inner arc side; 6. Free roller; 7. Third electromagnetic stirrer on the outer arc side; 8. Third electromagnetic stirrer on the inner arc side; 9. First electromagnetic stirrer; 10. Second frame; 11. Fan-shaped section body; 12. First electromagnetic stirring section; 13. Second electromagnetic stirring section; 14. Third electromagnetic stirring section; 15. Second electromagnetic stirrer; 16. Third electromagnetic stirrer. Detailed Implementation
[0022] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.
[0023] like Figure 1 As shown in the figure, the fan-shaped section with an electromagnetic stirring device for thin slabs in this embodiment is mainly used in CSP high-speed continuous casting and rolling technology, with a casting speed generally reaching 3-9 m / min. It is installed at the crystallizer outlet and is mainly used for the production of medium-to-high grade non-oriented silicon steel. The fan-shaped section includes a fan-shaped section body 11, which includes a first frame 3 and a second frame 10 arranged opposite to each other. Specifically, in this embodiment, the first frame 3 is the inner frame of the fan-shaped section, and the second frame 10 is the outer frame of the fan-shaped section. The space between the first frame 3 and the second frame 10 forms the moving channel for the slab 1.
[0024] like Figure 2 As shown, the fan-shaped segment body 11 includes a first electromagnetic stirring section 12 located at the inlet, a third electromagnetic stirring section 14 located at the outlet, and a second electromagnetic stirring section 13 located between the first electromagnetic stirring section 12 and the third electromagnetic stirring section 14. At least one set of free rollers 6 are provided on both sides of the billet moving channel between the first electromagnetic stirring section 12 and the second electromagnetic stirring section 13. At least one set of free rollers 6 are provided on both sides of the billet moving channel between the second electromagnetic stirring section 13 and the third electromagnetic stirring section 14. The free rollers 6 on both sides of the billet moving channel are symmetrically arranged.
[0025] like Figure 2As shown, the first electromagnetic stirring section 12 includes a first electromagnetic stirrer 9 mounted on the second frame 10. A non-magnetic roller 2 is mounted on one side of the billet movement channel within the first electromagnetic stirring section 12, and a free roller 6 is mounted on the other side. The non-magnetic roller 2 and the first electromagnetic stirrer 9 are mounted on the same frame. Specifically, the non-magnetic roller 2 is made of a non-magnetic material, typically a closely spaced roller, and its diameter is 90-110 mm. The non-magnetic roller 2 and the free roller 6 of the first electromagnetic stirring section 12 are symmetrically arranged.
[0026] The electromagnetic field X acting on the center of the billet 1 by the first electromagnetic stirrer 9 is ≥ 600 Gs. The effective electromagnetic field coverage area S of the first electromagnetic stirring section 12 is at least:
[0027] S = K × H,
[0028] In the formula, K is the cross-sectional width of the billet 1. H is the length of the billet's moving channel within the first electromagnetic stirring section 12, and the value of H is H≥600mm.
[0029] like Figure 2 As shown, the second electromagnetic stirring section 13 includes second electromagnetic stirrers 15 disposed on both sides of the billet movement channel within the second electromagnetic stirring section 13, and the second electromagnetic stirrers 15 are symmetrically arranged. Specifically, in this embodiment, the second electromagnetic stirrer 15 includes an outer arc-side second electromagnetic stirrer 4 and an inner arc-side second electromagnetic stirrer 5. The second electromagnetic stirrer 15 is a roller-shaped structure with the same shape as the free roller 6, and the roller diameter of the second electromagnetic stirrer 15 is 130-160mm. The electromagnetic field X acting on the center of the billet 1 by the second electromagnetic stirring section 13 is ≤800Gs.
[0030] like Figure 2 As shown, the third electromagnetic stirring section 14 includes third electromagnetic stirrers 16 disposed on both sides of the billet movement channel within the third electromagnetic stirring section 14, and the third electromagnetic stirrers 16 are symmetrically arranged. Specifically, in this embodiment, the third electromagnetic stirrer 16 includes an outer arc-side third electromagnetic stirrer 7 and an inner arc-side third electromagnetic stirrer 8. The third electromagnetic stirrer 16 is a roller-shaped structure with the same shape as the free roller 6, and the roller diameter of the third electromagnetic stirrer 16 is 160-200mm. The electromagnetic field X acting on the center of the billet 1 by the third electromagnetic stirrer 16 is ≥1200Gs.
[0031] The present invention provides a sector-shaped section for thin slabs with an electromagnetic stirring device, which can solve the current quality problems of CSP continuous casting billets. The equiaxed crystal content of the billet can reach more than 50%, thus solving the problem of high-end non-oriented silicon steel in CSP production.
[0032] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.
Claims
1. A sector-shaped section for a thin slab with an electromagnetic stirring device, comprising a sector-shaped section body (11), wherein the sector-shaped section body (11) includes a first frame (3) and a second frame (10) arranged opposite to each other, and the space between the first frame (3) and the second frame (10) is a channel for the movement of the casting slab; characterized in that: The fan-shaped section body (11) includes a first electromagnetic stirring section (12) located at the inlet, a third electromagnetic stirring section (14) located at the outlet, and a second electromagnetic stirring section (13) located between the first electromagnetic stirring section (12) and the third electromagnetic stirring section (14). At least one set of free rollers (6) are provided on both sides of the billet moving channel between the first electromagnetic stirring section (12) and the second electromagnetic stirring section (13). At least one set of free rollers (6) is provided on both sides of the billet moving channel between the second electromagnetic stirring section (13) and the third electromagnetic stirring section (14). The first electromagnetic stirring section (12) includes a first electromagnetic stirrer (9) set on the second frame (10). A non-magnetic roller (2) is set on one side of the billet moving channel in the first electromagnetic stirring section (12), and a free roller (6) is set on the other side. The non-magnetic roller (2) and the first electromagnetic stirrer (9) are set on the same frame. The second electromagnetic stirring section (13) includes a second electromagnetic stirrer (15) disposed on both sides of the billet moving channel in the second electromagnetic stirring section (13). The second electromagnetic stirrer (15) is a roller structure with the same shape as the free roller (6). The third electromagnetic stirring section (14) includes a third electromagnetic stirrer (16) disposed on both sides of the billet moving channel in the third electromagnetic stirring section (14), wherein the third electromagnetic stirrer (16) is a roller structure with the same shape as the free roller (6). The billet (1) enters the first electromagnetic stirring section (12) through the active channel. The first electromagnetic stirrer (9) installed in the first electromagnetic stirring section (12) is installed on one side. The first electromagnetic stirrer (9) and the non-magnetic roller (2) and free roller that cooperate with it play an initial stirring role for the molten steel entering the fan-shaped area. Then the billet (1) enters the second electromagnetic stirring section (13). The second electromagnetic stirrer (15) installed in the second electromagnetic stirring section (13) performs auxiliary stirring with a smaller electromagnetic field. Finally, the billet enters the third electromagnetic stirring section (14). The third electromagnetic stirrer (16) installed in the third electromagnetic stirring section (14) stirs with a larger electromagnetic intensity to break dendrites and form equiaxed crystals.
2. The sector-shaped section for thin slabs with electromagnetic stirring device according to claim 1, characterized in that, The electromagnetic field X acting on the center of the billet (1) by the first electromagnetic stirrer (9) is ≥600Gs; the electromagnetic field X acting on the center of the billet (1) by the second electromagnetic stirring section (13) is ≤800Gs; and the electromagnetic field X acting on the center of the billet (1) by the third electromagnetic stirrer (16) is ≥1200Gs.
3. The sector-shaped section for thin slabs with electromagnetic stirring device according to claim 1, characterized in that, The roller diameter of the second electromagnetic stirrer (15) is 130-160mm; the roller diameter of the third electromagnetic stirrer (16) is 160-200mm; and the roller diameter of the non-magnetic roller (2) is 90-110mm.
4. The sector-shaped section for thin slabs with electromagnetic stirring device according to claim 1, characterized in that, The effective electromagnetic field coverage area S of the first electromagnetic stirring section (12) is at least: S = K × H, In the formula, K is the cross-sectional width of the billet (1); K is the length of the billet moving channel within the first electromagnetic stirring section (12), and the value of H is H≥600mm.
5. The sector-shaped section for thin slabs with electromagnetic stirring device according to claim 1, characterized in that, The free rollers (6) on both sides of the billet moving channel are symmetrically arranged; the non-magnetic roller (2) of the first electromagnetic stirring section (12) is symmetrically arranged with the free roller (6); the second electromagnetic stirrer (15) is symmetrically arranged; and the third electromagnetic stirrer (16) is symmetrically arranged.