A non-equiangular four-side hole immersion nozzle suitable for ultra-thick plate continuous casting

Abstract

The present invention relates to the technical field of continuous casting. The present invention discloses a non-equi-angle four-side hole immersion nozzle suitable for continuous casting of ultra-thick plates, comprising a main body, a narrow side hole, and a wide side hole, wherein two narrow side holes are provided, and two wide side holes are provided, and the angle between the axis of the wide side hole and the cross section of the main body is greater than the angle between the axis of the narrow side hole and the cross section of the main body, so that the distance from the center of the narrow side hole to the narrow face plate is similar to the distance from the center of the wide side hole to the wide face plate, thereby reducing the impact of molten steel on the wide face shell of the ultra-thick plate, and allowing the wide face center shell to be partially remelted by a certain degree of impact, forming a shell thickness distribution feature of thick shells on both sides of the wide face and thin shells in the center within a safe range, thereby improving the non-uniform solidification caused by the fast growth rate of the wide face center shell due to uneven distribution of secondary cooling water.

Description

Technical Field

[0001] The invention relates to the technical field of continuous casting, and in particular to a non-equiangular four-side hole immersion nozzle suitable for continuous casting of extra-thick plates. Background Art

[0002] Wide and thick plates play a vital role in modern industry. They are important raw materials for manufacturing large, heavy-loaded, high-strength mechanical parts. They often work under huge loads and harsh environments, and need to have sufficient strength and stability. With the development of industrial technology, the demand for them is growing. Continuous casting technology can continuously and efficiently produce large quantities of billets, thus meeting the market's large demand for wide and thick plates. As the front-end product of wide and thick plate production, the quality of ultra-thick plate continuous casting billets is directly related to the performance and reliability of the final plate.

[0003] In order to improve the quality of extra-thick slabs, it is necessary to control the solidified shell starting from the crystallizer. The submerged nozzle is the connection link between the tundish and the crystallizer, and its structure directly affects the behavior characteristics of the molten steel flow, heat transfer and solidification in the crystallizer.

[0004] The conventional nozzle structure for continuous casting of extra-thick slabs is a double-side hole nozzle. During the continuous casting production process of extra-thick slabs, affected by the initial solidification shell of the crystallizer and the subsequent cooling process, it often presents non-uniform solidification characteristics, that is, the shell at the center of the width of the inner and outer arc sides grows at a relatively fast rate and bridges earlier, resulting in an "M" shape at the solidification end point. The molten steel with a high solute concentration cannot exchange with the external molten steel, and is sucked to the solidification front by the negative pressure generated by solidification shrinkage, resulting in uneven lateral distribution of the solute, severe segregation in the 1 / 4-1 / 8 area in the width direction, and it is difficult to eliminate in subsequent processes, resulting in unqualified rolled material performance and burying hidden dangers for engineering safety. Therefore, it is necessary to find a nozzle structure that can improve the quality of extra-thick slabs. Summary of the invention

[0005] In view of this, the present invention provides a non-equiangular four-side hole immersion nozzle suitable for ultra-thick plate continuous casting.

[0006] Specifically, the following technical solutions are included:

[0007] A non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting, comprising:

[0008] A main body, the main body is cylindrical and has an inner cavity;

[0009] Narrow side holes, two of which are arranged on the main body, the two narrow side holes are arranged opposite to each other, the narrow side holes are connected to the inner cavity and the crystallizer, and the narrow side holes and the narrow panels of the crystallizer are arranged in a one-to-one correspondence;

[0010] A wide surface side hole, wherein two wide surface side holes are provided, and the two wide surface side holes are arranged oppositely on the main body, the wide surface side holes are connected to the inner cavity and the crystallizer, and the wide surface side holes and the wide panels of the crystallizer are arranged in a one-to-one correspondence;

[0011] The axis of the narrow side hole and the axis of the wide side hole are arranged vertically, the axis of the narrow side hole is inclined toward the bottom of the main body and the angle between it and the cross section of the main body is a first angle, the axis of the wide side hole is inclined toward the bottom of the main body and the angle between it and the cross section of the main body is a second angle, and the second angle is greater than the first angle.

[0012] Preferably, the first angle is greater than 0° and less than 30°.

[0013] Preferably, the difference between the first angle and the second angle is an angle difference;

[0014] The angle difference is greater than 0° and less than 60°.

[0015] Preferably, the angle difference is calculated based on the cross-sectional length of the extra-thick plate, the cross-sectional width of the extra-thick plate and the drawing speed of the extra-thick plate: ;

[0016] Where: is the angle difference; , , is a constant; is the drawing speed of extra thick plates;

[0017] k is the area ratio coefficient , according to the cross-sectional length of the extra thick plate l and extra thick plate cross-sectional width w Calculate and obtain, is the correction factor.

[0018] Preferably, the area ratio coefficient has a value range of greater than 0.2 and less than or equal to 1.

[0019] Preferably, the correction factor has a value range of greater than or equal to 0.1 and less than or equal to 3.6.

[0020] Preferably, the hole area of ​​the narrow side hole is a first area, the hole area of ​​the wide side hole is a second area, and the first area is greater than the second area.

[0021] Preferably, the first area is greater than 15 cm 2 And less than 100cm 2 .

[0022] Preferably, the narrow surface side hole comprises a first narrow surface and a second narrow surface;

[0023] Two first narrow surfaces are provided, and the two first narrow surfaces are arranged in parallel and opposite to each other; two second narrow surfaces are provided, and the two second narrow surfaces are arranged in parallel and opposite to each other;

[0024] The angle between the first narrow surface and the cross section of the main body is a first angle, the second narrow surface and the cross section of the main body are arranged perpendicularly, and the second narrow surface and the narrow panel of the crystallizer are arranged perpendicularly.

[0025] Preferably, the wide surface side hole includes a first wide surface and a second wide surface;

[0026] There are two first wide surfaces, the two first wide surfaces are arranged in parallel and opposite to each other; there are two second wide surfaces, the two second wide surfaces are arranged in parallel and opposite to each other;

[0027] The angle between the first wide surface and the cross section of the main body is a first angle, the second wide surface and the cross section of the main body are vertically arranged, and the second wide surface and the wide panel of the crystallizer are vertically arranged.

[0028] The beneficial effects of the technical solution provided by the present invention include at least:

[0029] The present application adopts a four-side hole immersion nozzle to carry out continuous casting of extra-thick slabs, and makes the angle between the axis of the wide side hole and the cross-section of the main body larger than the angle between the axis of the narrow side hole and the cross-section of the main body, so that the distance from the center of the narrow side hole to the narrow panel is close to the distance from the center of the wide side hole to the wide panel, thereby reducing the impact of molten steel on the wide surface shell of the extra-thick slab, and allowing the center shell of the wide surface to be partially remelted after a certain degree of impact, forming a shell thickness distribution feature in which the two sides of the wide surface are thick and the center is thin within a safe range, thereby improving the non-uniform solidification caused by the faster growth rate of the center shell of the wide surface due to uneven distribution of secondary cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic diagram of the flow field simulation in the crystallizer when the existing double-side hole nozzle is applied to the ultra-thick plate continuous casting billet;

[0032] Figure 2 It is a schematic diagram of the flow field simulation in the crystallizer when the four-side-hole nozzle is applied to the continuous casting of extra-thick plate;

[0033] Figure 3It is a schematic diagram of the billet shell in the crystallizer when the existing double-side hole water inlet is applied to the ultra-thick plate continuous casting billet;

[0034] Figure 4 It is a schematic diagram of the billet shell in the crystallizer when the four-side hole water inlet is applied to the ultra-thick plate continuous casting billet;

[0035] Figure 5 A perspective structural diagram of a non-equiangular four-side hole immersion nozzle according to an embodiment of the present invention;

[0036] Figure 6 A schematic diagram of the first included angle and the wide side hole area of ​​a non-equal angle four-side hole immersion nozzle according to an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of the second included angle and the narrow side hole area of ​​a non-equal angle four-side hole immersion nozzle according to an embodiment of the present invention;

[0038] Figure 8 A schematic diagram of a flow field simulation in a crystallizer when a non-equi-angle four-side hole immersion nozzle according to an embodiment of the present invention is applied to a super thick plate continuous casting billet;

[0039] Fig. 9 It is a schematic diagram of a billet shell in a crystallizer when a non-equi-angle four-side hole immersion nozzle according to an embodiment of the present invention is applied to a super thick plate continuous casting billet;

[0040] The reference numerals in the figures represent respectively:

[0041] 1-main body; 11-inner cavity; 2-narrow side hole; 21-first narrow side; 22-second narrow side; 3-wide side hole; 31-first wide side; 32-second wide side.

[0042] The above drawings have shown a clear embodiment of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Before further describing the embodiments of the present invention in detail, the directional nouns involved in the embodiments of the present invention, such as "upper part", "lower part", "side part", etc., are Figure 1The directions shown in the figure are for reference only and do not limit the protection scope of the present invention.

[0045] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0046] As mentioned above, in the existing continuous casting of ultra-thick slabs, double-side water nozzles are used, resulting in non-uniform solidification, that is, the shell at the center of the width of the inner and outer arc sides grows at a relatively fast speed and bridges earlier, resulting in an "M" shape at the solidification end point. The molten steel with a high solute concentration cannot be exchanged with the external molten steel, and is sucked to the solidification front by the negative pressure generated by solidification shrinkage, resulting in uneven lateral distribution of the solute, severe segregation in the 1 / 4-1 / 8 area in the width direction, and it is difficult to eliminate it in subsequent processes, resulting in unqualified rolled material performance, which poses a hidden danger to engineering safety. In order to solve the above technical problems, a four-side hole nozzle is used in the continuous casting of ultra-thick slabs. The molten steel flows in from the tundish and flows out through the four side holes, flowing to the wide face plate and the narrow face plate of the crystallizer respectively. However, due to the large aspect ratio of the cross-section of the ultra-thick slab, the distance from the center of the nozzle to the narrow face plate is several times the distance from the center of the nozzle to the wide face plate. The molten steel will have a strong impact on the wide face shell of the ultra-thick slab and cause violent fluctuations in the liquid level, seriously affecting production safety and casting quality.

[0047] Fluent software is used to simulate and calculate the flow field of the double-side hole water nozzle and the four-side hole water nozzle in the crystallizer, so as to optimize the water nozzle structure. The schematic diagram of the flow field simulation in the crystallizer when the existing double-side hole water nozzle is applied to the ultra-thick plate continuous casting billet is shown in the figure. Figure 1 As shown in the figure, the schematic diagram of the flow field simulation in the crystallizer when the four-side hole nozzle is applied to the ultra-thick plate continuous casting billet is as follows Figure 2 As shown, through Figure 1 and Figure 2 It can be seen that the use of a four-side hole water inlet can significantly change the flow field of the extra-thick plate crystallizer. The molten steel flows into the crystallizer in four streams, which reduces the impact on the narrow panel and has a strong scouring effect on the wide panel. Because the wide panel is closer to the wide side hole 3, the molten steel rebounding from the wide panel to the meniscus still has a high flow rate, which will cause strong fluctuations in the liquid level and cause hazards such as slag rolling. The schematic diagram of the billet shell in the crystallizer when the existing double-side hole water inlet is applied to the extra-thick plate continuous casting billet is shown in the figure. Figure 3 As shown in the figure, the schematic diagram of the shell in the crystallizer when the four-side hole water inlet is applied to the ultra-thick plate continuous casting billet is as follows Figure 4 As shown, through Figure 3 and Figure 4 It can be seen that the solidified shell in the center of the wide surface is greatly thinned under the erosion of high-temperature molten steel, which can easily lead to accidents such as steel leakage.

[0048] In order to further improve the quality of extra thick slabs, Figure 5 , Figure 6 and Figure 7As shown, the present application proposes a non-equi-angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting, comprising: a main body 1, the main body 1 is cylindrical, and the main body 1 has an inner cavity 11. Narrow side holes 2, two narrow side holes 2 are provided, and the two narrow side holes 2 are relatively arranged on the main body 1, the narrow side holes 2 connect the inner cavity 11 and the crystallizer, and the narrow side holes 2 and the narrow face plate of the crystallizer are arranged one by one. Wide side holes 3, two wide side holes 3 are provided, and the two wide side holes 3 are relatively arranged on the main body 1, the wide side holes 3 connect the inner cavity 11 and the crystallizer, and the wide side holes 3 and the wide face plate of the crystallizer are arranged one by one. The narrow side hole 2 and the wide side hole 3 are arranged at the lower part of the main body 1. The molten steel flows from the tundish into the inner cavity 11 of the main body 1, and flows into the crystallizer through the narrow side hole 2 and the wide side hole 3. The axis of the narrow side hole 2 and the axis of the wide side hole 3 are vertically arranged. The angle between the axis of the narrow side hole 2 and the cross section of the main body 1 is a first angle, and the angle between the axis of the wide side hole 3 and the cross section of the main body 1 is a second angle, and the second angle is greater than the first angle. The present application introduces a four-side hole submerged water nozzle into the continuous casting of extra-thick slabs, and makes the angle between the axis of the wide side hole 3 and the cross-section of the main body 1 larger than the angle between the axis of the narrow side hole 2 and the cross-section of the main body 1, so that the distance from the center of the narrow side hole 2 to the narrow panel is close to the distance from the center of the wide side hole 3 to the wide panel, thereby reducing the impact of molten steel on the wide surface shell of the extra-thick slab, and allowing the center shell of the wide surface to be partially remelted after a certain degree of impact, forming a shell thickness distribution feature in which the wide side is thick on both sides and thin in the center within a safe range, thereby improving the non-uniform solidification caused by the faster growth rate of the center shell of the wide surface due to uneven distribution of secondary cooling water.

[0049] Specifically, Figure 5 As shown, the narrow side hole 2 includes four side surfaces, namely, a first narrow surface 21 and a second narrow surface 22. Two first narrow surfaces 21 are provided, and the two first narrow surfaces 21 are provided in parallel and opposite to each other. Two second narrow surfaces 22 are provided, and the two second narrow surfaces 22 are provided in parallel and opposite to each other. The first narrow surface 21 is inclined toward the bottom direction of the main body 1, and the angle between the first narrow surface 21 and the cross section of the main body 1 is the first angle. The second narrow surface 22 is provided perpendicularly to the cross section of the main body 1, and the second narrow surface 22 is provided perpendicularly to the narrow panel of the crystallizer. Furthermore, the second narrow surface 22 is provided in parallel to the wide panel of the crystallizer.

[0050] Specifically, Figure 5 As shown, the wide side hole 3 includes four side surfaces, namely, a first wide surface 31 and a second wide surface 32. Two first wide surfaces 31 are provided, and the two first wide surfaces 31 are provided in parallel and opposite to each other. Two second wide surfaces 32 are provided, and the two second wide surfaces 32 are provided in parallel and opposite to each other. The first wide surface 31 is inclined toward the bottom direction of the main body 1, and the angle between the first wide surface 31 and the cross section of the main body 1 is the first angle. The second wide surface 32 is provided perpendicularly to the cross section of the main body 1, and the second wide surface 32 is provided perpendicularly to the wide panel of the crystallizer. Furthermore, the second wide surface 32 is provided in parallel to the narrow panel of the crystallizer.

[0051] Further, the cross section of the narrow side hole 2 is rectangular or racetrack-shaped. The cross section of the wide side hole 3 is rectangular or racetrack-shaped.

[0052] Preferably, Figure 6 As shown, the first angle α1 is greater than 0° and less than 30°.

[0053] Preferably, Figure 6 and Figure 7 As shown, the difference between the first angle α1 and the second angle α2 is the angle difference , the angle difference is greater than 0° and less than 60°.

[0054] Furthermore, the angle difference According to the cross-sectional length of the extra thick plate l , Extra thick plate cross section width w And the drawing speed of extra thick plate Calculation results: ;

[0055] Where: is the angle difference; , , is a constant; is the drawing speed of extra thick plates;

[0056] k is the area ratio coefficient , according to the cross-sectional length of the extra thick plate l and extra thick plate cross-sectional width w Calculate and obtain, is the correction factor. Specifically, this embodiment is applicable to the cross-sectional width of the extra thick plate w ≥400mm, extra thick plate cross section length l Continuous casting ≥1800mm, Take 5.218, Take 8.31, Take 7.65.

[0057] Furthermore, the area ratio coefficient k The value range is greater than 0.2 and less than or equal to 1.

[0058] Furthermore, the correction factor The value range of is greater than or equal to 0.1 and less than or equal to 3.6. And the correction factor The cross-sectional length of the extra thick plate l and extra thick plate cross-sectional width w The ratio is inversely proportional to the cross-sectional length of the extra thick plate. l and extra thick plate cross-sectional width w The larger the ratio, the greater the correction factor. The smaller the value, the smaller the area ratio coefficient k Control within a reasonable range.

[0059] Preferably, Figure 6 and Figure 7 As shown, the hole area of ​​the narrow side hole 2 is the first area S1, and the hole area of ​​the wide side hole 3 is the second area S1, and the first area S1 is greater than the second area S2. Further, the first area S1 is equal to the second area S2 and the area ratio coefficient k The product of .

[0060] Furthermore, the first area S1 is greater than 15 cm 2 And less than 100cm 2 .

[0061] Further, after the implementation of this application, the schematic diagram of the flow field simulation in the crystallizer when the non-equiangular four-side hole immersion nozzle is applied to the ultra-thick plate continuous casting billet is as follows: Figure 8 As shown in the figure, the non-equiangular four-side hole immersion nozzle is applied to the billet shell in the crystallizer when the thick plate continuous casting billet is applied. Fig. 9 As shown. Figure 1 , Figure 2 and Figure 8 The contrast, Figure 3 , Figure 4 and Fig. 9 By comparison, it can be seen that the present application applies the four-side hole water inlet to the continuous casting of extra-thick plates, and increases the inclination angle of the wide side hole 3. While reducing the impact of molten steel on the narrow panel and stabilizing the liquid level of the crystallizer, it can ensure that the wide surface billet shell is in a safe thickness range, effectively improving the non-uniform solidification phenomenon during continuous casting of extra-thick plates.

[0062] The F number is used to determine the fluctuation of the liquid level in the crystallizer. The larger the F number, the more severe the liquid level fluctuation. The calculation formula is as follows: ;

[0063] in, ρ is the density of molten steel; is the steel throughput; is the impact velocity of the molten steel stream; β is the impact angle of the molten steel stream; D is the distance from the impact point to the slag interface.

[0064] Furthermore, compared with the conventional double-side hole water inlet, the F number of the narrow surface of the meniscus when the non-equiangular four-side hole immersion water inlet of the present application is applied is reduced by 1-1.5; compared with the conventional four-side hole water inlet, the F number of the wide surface of the meniscus when the non-equiangular four-side hole immersion water inlet of the present application is applied is reduced by 1-2.5, and the thickness of the wide surface blank shell out of the crystallizer is increased by 2-5 mm. While maintaining the stability of the crystallizer flow field, the wide surface blank shell presents the characteristics of being thin in the center and thick on both sides, which effectively improves the non-uniform solidification phenomenon of the extra-thick plate, such as Fig. 9 shown.

[0065] As a specific embodiment, the parameters of the ultra-thick slab required for continuous casting are as follows: the cross-sectional size is 450mm×2070mm, the steel composition (by mass percentage) is C: 0.14-0.30%, Si: 0.20-0.30%, Mn: 0.80-1.10%, P≤0.01%, S≤0.02%, Al≤0.01%, Ti≤0.01%, the superheat of the molten steel is 15-20°C, and the pulling speed is The speed is 0.45 m / min, the first angle α1 of the narrow side hole 2 is 15°, and the side hole area S1 is 24 cm 2 , the nozzle immersion depth is 150 mm. Correction factor The value is 0.16, and the corresponding side hole area ratio coefficient k is 0.736, the side hole angle difference is 16°, that is, the second angle α2 of the wide side hole 3 is 31°, and the area of ​​the side hole is 17.64 cm 2 . The flow, heat transfer and solidification of molten steel in the crystallizer were simulated and calculated. The results show that after applying the non-equi-angle four-side hole immersion nozzle, a stable flow field can be obtained in the crystallizer, and the wide face F number is 3.1. When the slag is in a state that will not cause serious impact on the stability of the slag interface, the thickness of the billet shell at the center of the wide face when leaving the crystallizer is 26mm, which is within the safe range and will not cause steel leakage accidents. The billet shell thickness at other positions on the wide face is reduced by 4mm, and the non-uniform solidification length at the end of solidification is shortened by 0.9m, which effectively reduces the non-uniform solidification problem of extra-thick plates. Among them, the nozzle immersion depth is the depth of the nozzle extending into the crystallizer. In this application, the nozzle immersion depth can be adjusted according to demand.

[0066] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0067] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting, characterized in that: include: A main body, the main body is cylindrical and has an inner cavity; Narrow side holes, two of which are arranged on the main body, the two narrow side holes are arranged opposite to each other, the narrow side holes are connected to the inner cavity and the crystallizer, and the narrow side holes and the narrow panels of the crystallizer are arranged in a one-to-one correspondence; A wide surface side hole, wherein two wide surface side holes are provided, and the two wide surface side holes are arranged oppositely on the main body, the wide surface side holes communicate with the inner cavity and the crystallizer, and the wide surface side holes and the wide panel of the crystallizer are arranged in a one-to-one correspondence; The axis of the narrow side hole and the axis of the wide side hole are arranged vertically, the axis of the narrow side hole is inclined toward the bottom of the main body and the angle between it and the cross section of the main body is a first angle, the axis of the wide side hole is inclined toward the bottom of the main body and the angle between it and the cross section of the main body is a second angle, and the second angle is greater than the first angle.

2. The non-equiangular four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 1, characterized in that: The first angle is greater than 0° and less than 30°.

3. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 1, characterized in that: The difference between the first angle and the second angle is an angle difference; The angle difference is greater than 0° and less than 60°.

4. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 3, characterized in that: The angle difference is calculated based on the cross-sectional length, cross-sectional width and drawing speed of the extra-thick plate: ; Where: is the angle difference; , , is a constant; is the drawing speed of extra thick plates; k is the area ratio coefficient , according to the cross-sectional length of the extra thick plate l and extra thick plate cross-sectional width w Calculate and obtain, is the correction factor.

5. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 4, characterized in that: The area ratio coefficient has a value range of greater than 0.2 and less than or equal to 1.

6. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 4, characterized in that: The correction factor has a value range of greater than or equal to 0.1 and less than or equal to 3.

6.

7. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 1, characterized in that: The hole area of ​​the narrow side hole is a first area, and the hole area of ​​the wide side hole is a second area, and the first area is greater than the second area.

8. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 7, characterized in that: The first area is greater than 15 cm 2 And less than 100cm 2 .

9. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 1, characterized in that: The narrow surface side hole comprises a first narrow surface and a second narrow surface; There are two first narrow surfaces, which are arranged in parallel and opposite to each other; there are two second narrow surfaces, which are arranged in parallel and opposite to each other; The angle between the first narrow surface and the cross section of the main body is a first angle, the second narrow surface and the cross section of the main body are arranged perpendicularly, and the second narrow surface and the narrow panel of the crystallizer are arranged perpendicularly.

10. The non-uniform angle four-side hole immersion nozzle suitable for ultra-thick plate continuous casting according to claim 1, characterized in that: The wide surface side hole comprises a first wide surface and a second wide surface; There are two first wide surfaces, which are arranged in parallel and opposite to each other; there are two second wide surfaces, which are arranged in parallel and opposite to each other; The angle between the first wide surface and the cross section of the main body is a second angle, the second wide surface and the cross section of the main body are vertically arranged, and the second wide surface and the wide panel of the crystallizer are vertically arranged.

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