CN211758438U - Submersed nozzle for high-speed continuous casting of small square billets - Google Patents
Submersed nozzle for high-speed continuous casting of small square billets Download PDFInfo
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- CN211758438U CN211758438U CN202020445842.9U CN202020445842U CN211758438U CN 211758438 U CN211758438 U CN 211758438U CN 202020445842 U CN202020445842 U CN 202020445842U CN 211758438 U CN211758438 U CN 211758438U
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Abstract
The utility model discloses an immersion nozzle for high-speed continuous casting of small square billets, which comprises an immersion nozzle body, a nozzle straight hole and a small side hole; the upper part of the submerged nozzle body is connected with the sliding nozzle at the bottom of the tundish, and the lower part of the submerged nozzle body is communicated with the crystallizer; the water gap straight-through hole penetrates through the middle part of the submerged water gap body and is used for passing molten steel; the outside of immersion nozzle body is close to the lower part and is equipped with the slag line, the lateral wall that the immersion nozzle body was run through to little side opening is located the below of slag line, and the quantity of little side opening is a plurality of. Under the high throwing speed condition, the utility model discloses can reduce the velocity of flow of the straight hole exit molten steel of immersion nozzle, reduce the depth of impact of stream, reduce the difference of slag interface molten steel temperature, be favorable to the homogenization sediment and lower sediment, promote the even growth of solidification blank shell in the crystallizer.
Description
Technical Field
The utility model belongs to the technical field of the metallurgy, involve the ferrous metallurgy continuous casting process technology, concretely relates to immersion nozzle is used in high-speed continuous casting of billet.
Background
In the continuous casting production, the production capacity of a continuous casting machine can be greatly increased by increasing the blank drawing speed, and the adoption of the high-speed continuous casting technology is an important technical approach for improving the continuous casting production efficiency, reducing cost and improving efficiency and is a long-term pursuit target in the continuous casting field. At present, the blank drawing speed of the domestic small square billet arc continuous casting machine can be stabilized above 4.2m/min, and the maximum blank drawing speed can reach 5.07 m/min. In the continuous casting production of small square billets, a straight-through type submerged nozzle is usually adopted for pouring, the billet drawing speed is improved, the impact depth of molten steel in a crystallizer is increased, the upward floating removal of inclusions in the molten steel is not facilitated, the impact on a solidified billet shell at the outer arc side in the crystallizer is enhanced, the ascending reflux at the outer arc side is stronger than that at the inner arc side, the difference of the temperature of a steel slag interface is increased, the uniform melting and slagging of protective slag are not facilitated, and the defects of high inclusion content, stripping, surface cracks and the like easily occur to the high-speed continuous casting small square billets.
In order to prevent the problems of casting blank purity reduction and casting blank defects caused by high drawing speed and improve the quality of the casting blank, a large number of technical means are adopted in production, and the technical means improve the problems caused by high drawing speed pouring to a certain extent, but have some problems.
In the prior art, the main technical means and problems adopted at present comprise:
(1) electromagnetic braking technology for crystallizer. The electromagnetic braking device is arranged at the upper part of the crystallizer, so that the stream of the molten steel from the water gap is braked, the impact depth of the molten steel and the fluctuation of a steel slag interface are reduced, and the upward movement of a high-temperature area in the crystallizer is promoted. The technology is mainly used in the continuous casting of thin slabs and slabs, and the electromagnetic braking technology is not applied in the continuous casting of small square slabs.
(2) Electromagnetic stirring technology for crystallizer. The electromagnetic stirring technology of the crystallizer can reduce the impact depth of the molten steel by driving the molten steel to rotate and flow. The electromagnetic stirring technology of the crystallizer is adopted in the continuous casting production of the small square billet, the electromagnetic stirring intensity is fixed along with the improvement of the billet drawing speed, the fluctuation of a steel slag interface near a water gap is enhanced, the slag entrapment phenomenon occurs on the liquid level when a certain value is reached, the molten steel slag entrapment is caused, and meanwhile, the production cost is relatively high.
(3) And optimizing the structural parameters and technological parameters of the water gap. The purposes of reducing the impact depth of molten steel and reducing the overlarge fluctuation of a steel slag interface can be realized by increasing the area of a water gap outlet and reducing the immersion depth of a water gap. The continuous casting of small square billets generally adopts a straight-through type nozzle structure, and the optimization mode is limited by the requirements of the size of an inner cavity of a crystallizer, the wall thickness of a nozzle and the strength under the condition of high drawing speed.
(4) Arc submerged nozzle technology. Chinese utility model publication No. CN206662259U discloses a small square billet crystallizer submerged nozzle, which is designed into an arc section at the lower part of the inner cavity of the nozzle to provide a buffer to prevent the direct impact of the steel flow under direct impact on the primary billet shell in the outer arc region of the square billet, thereby ensuring the casting quality. However, under the condition of high-casting-speed continuous casting, the water gap can not solve the problems that the impact depth of molten steel is too deep and inclusions are not easy to float upwards.
(5) And (3) a porous water gap flow control technology. A two-side hole water gap structure is usually adopted in the slab continuous casting process; four-hole or five-hole nozzles are usually adopted in bloom continuous casting, the sizes of side holes of the four-hole nozzles are the same, the sizes of the four side holes of the five-hole nozzle are larger than the size of a fifth hole at the bottom of the nozzle, and the fifth hole is arranged at the bottom of the nozzle to reduce molten steel retention in the adjacent area of the bottom of the nozzle. (a) The Chinese patent publication No. CN102764865A discloses an immersion nozzle of a high-casting-speed continuous casting crystallizer, wherein transversely and straightly staggered wave-shaped grooves are arranged at the bottom of the nozzle, the hole wall of a side hole is provided with a wavy curved surface which is fluctuated, molten steel flows in through an upper opening of an inner cavity of a side wall, rebounds after impacting the bottom of the inner cavity of the side wall and flows out of the side hole of the side wall, the speed of the molten steel is buffered through the bottom of the inner cavity, the kinetic energy of the molten steel is dissipated, and the impact force of the molten steel at the high-. (b) Chinese utility model publication No. CN204413139U discloses a submerged nozzle for high-casting speed slab continuous casting, the bottom of the nozzle body is a concave spherical surface, the molten steel in the nozzle body enters the nozzle by the rebound of the spherical bottom, the rebounded molten steel can collide with the lower stream, the kinetic energy of the molten steel is dissipated, the smooth flow of the molten steel flowing out of the side hole of the nozzle is ensured, and the fluctuation of the molten steel level during high-casting speed is reduced. (c) The Chinese patent publication No. CN102950275A discloses a multi-hole continuous casting submerged nozzle for square and round billets, wherein a plurality of side holes are uniformly distributed on the side wall higher than the upper surface of a bottom plate and lower than or equal to the upper surface of a boss, and the boss protruding towards an inner cavity is arranged at the center of the upper surface of the bottom plate, so that a crystallizer is transversely kept in a uniform temperature field and flow field, and the impact of molten steel on an initially solidified billet shell on the wall surface of the crystallizer can be reduced. The three types of water gaps are not provided with holes at the bottom, and are not suitable for the production process conditions of high-speed continuous casting small square billets. (d) The Chinese patent with publication number CN108746578A discloses a rotary jet flow submerged nozzle, wherein the bottom of the central hole of the nozzle is provided with N spiral cambered surface inclined side holes and 1 circular truncated cone-shaped bottom hole, and the average size of the bottom hole is smaller than that of the inner cavity of the nozzle. Under the condition of high steel flux, the water gap structure is not suitable for the production process condition of the high-speed continuous casting billet.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that exists among the prior art and not enough, the utility model provides a high-speed continuous casting of billet is with immersion nozzle. Under the high throwing speed condition, the utility model discloses can reduce the velocity of flow of the straight hole exit molten steel of immersion nozzle, reduce the depth of impact of stream, reduce the difference of slag interface molten steel temperature, be favorable to the homogenization sediment and lower sediment, promote the even growth of solidification blank shell in the crystallizer.
Therefore, the utility model adopts the following technical scheme:
a submersed nozzle for high-speed continuous casting of small square billets comprises a submersed nozzle body, a nozzle straight-through hole and a small side hole; the upper part of the submerged nozzle body is connected with the sliding nozzle at the bottom of the tundish, and the lower part of the submerged nozzle body is communicated with the crystallizer; the water gap straight-through hole penetrates through the middle part of the submerged water gap body and is used for passing molten steel; the outside of immersion nozzle body is close to the lower part and is equipped with the slag line, the lateral wall that the immersion nozzle body was run through to little side opening is located the below of slag line, and the quantity of little side opening is a plurality of.
Preferably, the small side hole is an expanding side hole, and the section size of the side hole close to the inner cavity of the submerged nozzle body is smaller than that of the side hole close to the outer side of the submerged nozzle body.
Preferably, the central line of the small side hole forms a downward inclination angle with the horizontal direction.
Further, the downward inclination angle is between 30 and 60 °.
Preferably, the sum of the average cross-sectional areas of the small side holes is smaller than the cross-sectional area of the straight through hole of the nozzle.
Further, the sum of the average cross-sectional areas of the small side holes is 10-30% of the cross-sectional area of the straight through hole of the water gap.
Preferably, the small side holes are uniformly distributed along the circumferential direction of the submerged nozzle body.
Further, the number of the small side holes is 4-8.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model provides a high-speed continuous casting of billet uses immersion nozzle not only can reduce molten steel depth of impact and intensity, still helps improving the regional molten steel cooling solidification's of crystallizer initial solidification circumference homogeneity.
(2) Through the shunting of a plurality of small expanding side holes, the flow velocity of the molten steel entering the small square billet crystallizer through the submerged nozzle straight-through hole is obviously reduced, the impact depth of the molten steel becomes shallow, and the impact strength on the outer arc side of a casting blank is reduced.
(3) The flow velocity of molten steel of the small side hole can be further reduced by the expansion type small side hole, and the risk of strong scouring caused by too close distance between the outer wall of the water gap and the initial solidified billet shell in the continuous casting process of the small square billet is avoided.
(4) The outflow of the small side hole reaches the side surface to form an upper flow and a lower flow, the descending flow collides with the ascending flow formed by the impact flow in the through hole at the bottom of the water gap, the ascending turbulent kinetic energy of the descending flow is dissipated, and the over-strong ascending flow at the outer arc side in the small square billet arc continuous casting machine is reduced; the relatively uniformly distributed upward flow in the circumferential direction formed by the small side holes is beneficial to reducing the difference of the flowing of a steel slag interface, is beneficial to uniformly melting and discharging the protective slag, and improves the uniformity of lubrication and heat transfer of the crystallizer, thereby playing the roles of improving the purity of molten steel, preventing the defects of stripping, cracking and the like from forming.
Drawings
Fig. 1 is a schematic structural view of a submerged nozzle for high-speed continuous casting of small square billets according to a first embodiment of the present invention.
Fig. 2 is a sectional view of an immersion nozzle for high-speed continuous casting of billets according to a first embodiment of the present invention.
Fig. 3 is a schematic structural view of a submerged nozzle for high-speed continuous casting of small square billets according to a second embodiment of the present invention.
Fig. 4 is a B-B sectional view of a submerged nozzle for high-speed continuous casting of billets according to a second embodiment of the present invention.
Description of reference numerals: 1. a submerged entry nozzle body; 2. a water gap straight through hole; 3. a slag line; 4. a small side hole.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are only used for explaining the present invention, but not for limiting the present invention.
A submerged nozzle for high-speed continuous casting of small square billets comprises a submerged nozzle body 1, a nozzle straight through hole 2 and a small side hole 4; the upper part of the submerged nozzle body 1 is connected with a sliding nozzle at the bottom of the tundish, and the lower part of the submerged nozzle body is communicated with the crystallizer; the water gap straight-through hole 2 penetrates through the middle part of the submerged water gap body 1 and is used for molten steel to pass through; the outside of immersion nozzle body 1 is close to the lower part and is equipped with slag line 3, little side opening 4 runs through the lateral wall of immersion nozzle body 1 and is located the below of slag line 3, and the quantity of little side opening 4 is a plurality of.
Specifically, little side opening 4 is the expanding type side opening, and the side opening cross dimension that is close to 1 inner chamber of immersion nozzle body is less than the side opening cross dimension that is close to the 1 outside of immersion nozzle body.
Specifically, the central line of the small side hole 4 forms a downward inclination angle with the horizontal direction.
In particular, said downward inclination angle is comprised between 30 and 60 °.
Specifically, the sum of the average cross-sectional areas of the small side holes 4 is smaller than the cross-sectional area of the nozzle straight through hole 2.
Specifically, the sum of the average cross-sectional areas of the small side holes 4 is 10-30% of the cross-sectional area of the straight through hole 2 of the water gap.
Specifically, the small side holes 4 are uniformly distributed along the circumferential direction of the submerged nozzle body 1.
Specifically, the number of the small side holes 4 is between 4 and 8.
Example one
As shown in figure 1 and figure 2, the utility model discloses an immersion nozzle for high-speed continuous casting of billet, including immersion nozzle body 1, the straight through hole 2 in mouth of a river, little side opening 4 of expansion type. The small side holes 4 are uniformly distributed in an annular array by taking the submerged nozzle body 1 as the center, the number of the small side holes 4 is 4, and the inclination angle of the nozzle is 450The cross-sectional area of the small side hole 4 close to the side of the nozzle through hole 2 is 6mm multiplied by 8mm, the cross-sectional area of the small side hole 4 close to the outer side of the submerged nozzle body 1 is 7.2mm multiplied by 9.6mm, and the diameter of the nozzle through hole 2 is 35 mm.
Under the conditions that the throwing speed is 4.0m/min, the immersion depth of a submerged nozzle into molten steel is 110mm, and the section size of a casting blank is 150mm multiplied by 150mm, the impact depth of the molten steel in the crystallizer is reduced from 554mm to 445mm, and the maximum temperature difference of a steel slag interface is reduced from 5 ℃ to 3.5 ℃.
Example two
As shown in fig. 3 and 4Show, the utility model discloses a high-speed continuous casting of little square billet is with immersion nozzle, including immersion nozzle body 1, the straight through hole in mouth of a river 2, little side opening 4 of expansion type. The small side holes 4 are uniformly distributed in an annular array by taking the submerged nozzle body 1 as the center, the number of the small side holes 4 is 6, and the inclination angle of the nozzle is 450The cross-sectional area of the small side hole 4 close to the side of the nozzle through hole 2 is 6mm multiplied by 8mm, the cross-sectional area of the small side hole 4 close to the outer side of the submerged nozzle body 1 is 7.2mm multiplied by 9.6mm, and the diameter of the nozzle through hole 2 is 40 mm.
Under the conditions that the throwing speed is 4.5m/min, the immersion depth of a submerged nozzle into molten steel is 110mm, and the section size of a casting blank is 150mm multiplied by 150mm, the impact depth of the molten steel in the crystallizer is reduced from 513mm to 426mm, and the maximum temperature difference of a steel slag interface is reduced from 4.1 ℃ to 2.1 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and scope of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a high-speed continuous casting of billet is with immersion nozzle which characterized in that: comprises an immersion nozzle body (1), a nozzle straight through hole (2) and a small side hole (4); the upper part of the submerged nozzle body (1) is connected with a sliding nozzle at the bottom of the tundish, and the lower part of the submerged nozzle body is communicated with the crystallizer; the water gap straight-through hole (2) penetrates through the middle part of the submerged water gap body (1) and is used for molten steel to pass through; the outside of immersion nozzle body (1) is close to the lower part and is equipped with slag line (3), little side opening (4) run through the lateral wall of immersion nozzle body (1) and are located the below of slag line (3), and the quantity of little side opening (4) is a plurality of.
2. The submerged entry nozzle for high-speed continuous casting of billets according to claim 1, characterized in that: the small side hole (4) is an expansion side hole, and the side hole section size close to the inner cavity of the submerged nozzle body (1) is smaller than the side hole section size close to the outer side of the submerged nozzle body (1).
3. The submerged entry nozzle for high-speed continuous casting of billets according to claim 2, characterized in that: the central line of the small side hole (4) forms a downward inclination angle with the horizontal direction.
4. The submerged entry nozzle for high-speed continuous casting of billets according to claim 3, characterized in that: the downward inclination angle is between 30-60 deg..
5. The submerged entry nozzle for high-speed continuous casting of billets according to claim 2, characterized in that: the sum of the average section areas of the small side holes (4) is smaller than the section area of the straight through hole (2) of the water gap.
6. The submerged entry nozzle for high-speed continuous casting of billets according to claim 5, characterized in that: the sum of the average cross section areas of the small side holes (4) is 10-30% of the cross section area of the straight through hole (2) of the water gap.
7. The submerged entry nozzle for high-speed continuous casting of billets according to any one of claims 1 to 6, characterized in that: the small side holes (4) are uniformly distributed along the circumferential direction of the submerged nozzle body (1).
8. The submerged entry nozzle for high-speed continuous casting of billets according to claim 7, characterized in that: the number of the small side holes (4) is between 4 and 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020445842.9U CN211758438U (en) | 2020-03-31 | 2020-03-31 | Submersed nozzle for high-speed continuous casting of small square billets |
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| CN202020445842.9U CN211758438U (en) | 2020-03-31 | 2020-03-31 | Submersed nozzle for high-speed continuous casting of small square billets |
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| CN211758438U true CN211758438U (en) | 2020-10-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215617A (en) * | 2020-03-31 | 2020-06-02 | 武汉科技大学 | Submersed nozzle for high-speed continuous casting of small square billets |
| CN112643007A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Continuous casting method for reducing large-size inclusions on surface layer of aluminum-containing steel casting blank |
-
2020
- 2020-03-31 CN CN202020445842.9U patent/CN211758438U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215617A (en) * | 2020-03-31 | 2020-06-02 | 武汉科技大学 | Submersed nozzle for high-speed continuous casting of small square billets |
| CN112643007A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Continuous casting method for reducing large-size inclusions on surface layer of aluminum-containing steel casting blank |
| CN112643007B (en) * | 2020-11-23 | 2022-05-20 | 首钢集团有限公司 | Continuous casting method for reducing large-size impurities on surface layer of aluminum-containing steel casting blank |
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