CN115319073B - Long-service-life tundish for near-net-shaped ultrathin deformed steel continuous casting and application method - Google Patents
Long-service-life tundish for near-net-shaped ultrathin deformed steel continuous casting and application method Download PDFInfo
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- CN115319073B CN115319073B CN202211000384.8A CN202211000384A CN115319073B CN 115319073 B CN115319073 B CN 115319073B CN 202211000384 A CN202211000384 A CN 202211000384A CN 115319073 B CN115319073 B CN 115319073B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 103
- 239000010959 steel Substances 0.000 title claims abstract description 103
- 238000009749 continuous casting Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 21
- 238000004401 flow injection analysis Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 abstract description 6
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 238000010079 rubber tapping Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011449 brick Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 101150038956 cup-4 gene Proteins 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
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Abstract
The invention provides a long-life tundish for near-net-shaped ultrathin special-shaped blank continuous casting and a use method thereof, belonging to the technical field of ultrathin special-shaped blank continuous casting. The tundish device comprises a tundish body and a cavity for containing molten steel in the tundish body, wherein the tundish body consists of a pair of first side walls, a second side wall, a third side wall and a ladle bottom arranged in parallel; the middle part of the third side wall protrudes outwards to form an outer convex part; the outer convex part is provided with a cylindrical retaining wall which divides the cavity into a circular impact area and a flow injection area; two dams are arranged between the retaining wall and the second side wall, the two dams divide the injection region into three regions, and each region comprises a group of tundish outlets. The invention can improve the residence time of molten steel in the tundish and enhance the floating of inclusions, thereby improving the purity of the molten steel, improving the stability of the quality of each casting billet, reducing the impact of the molten steel on the tundish wall, reducing the erosion of the tundish wall and prolonging the service life of the tundish.
Description
Technical Field
The invention relates to the field of tundish in continuous casting procedures of steel mills, in particular to a long-service-life tundish for continuous casting of near-net-shaped ultrathin deformed steel and a use method thereof.
Background
The tundish is an important device in continuous casting production and is mainly used for receiving and temporarily storing large ladle molten steel so as to realize stable flow of the molten steel in the crystallizer. However, when the existing tundish is used for pouring, the problems of short molten steel residence time, poor consistency of response time of each flow, large dead zone proportion and the like exist, so that inclusions in the molten steel are difficult to float up effectively, the consistency of each casting blank is poor, and the like, so that the quality of a casting blank is low and certain fluctuation exists. Meanwhile, the short-final ultrathin special-shaped blank continuous casting tundish has a long length and a high flow velocity, so that the service life of the tundish is low, the continuous casting production efficiency is reduced, and the tundish becomes a limiting link for improving the yield in steelmaking production.
Chinese patent document CN 206622605U (201720366794.2) discloses a three-machine three-stream slab continuous casting tundish, wherein the tundish body adopts a T-shaped structure, a tundish lining is arranged between the tundish body and a molten steel cavity, a U-shaped slag blocking wall is arranged at the T-shaped intersection of the molten steel cavity, two ends of the U-shaped slag blocking wall are fixedly connected with the tundish lining, the molten steel cavity is divided into an impact area and a flow injection area, and two side walls of the U-shaped slag blocking wall are respectively provided with flow guide holes for communicating the impact area and the flow injection area; the pouring area is provided with three tapping holes, namely a first tapping hole, a second tapping hole and a third tapping hole, and a dam is arranged between the lower support brick and the first tapping hole and between the lower support brick and the third tapping hole. The molten steel can be ensured to be uniformly distributed to each tapping hole so as to be matched with a large converter for use, the production capacity is improved, the temperature difference of molten steel of each flow can be reduced, the floating of inclusions is promoted, and the service life of the tundish refractory material is prolonged.
The tundish provided by the above patent can improve the residence time of the molten steel by increasing the flow rate of the molten steel at the first and third steel tapping holes through the dam, but the flow rate of the molten steel can be obviously reduced, so that the temperature drop can be increased, and the temperature of the molten steel of the tundish must be increased to ensure the stability of pouring, so that the cost is higher. The above patent is a slab tundish, the tapping hole is larger, and the above problems can be alleviated to a certain extent. However, the tundish steel outlet used for the ultrathin beam blank is small, the web is only 90mm, and if the tundish structure of the patent is adopted, the temperature drop of molten steel is increased. At this time, in order to ensure normal production, the ladle molten steel temperature must be increased more, which leads to increased refining power consumption, increased ladle erosion, and increased tundish erosion. Meanwhile, the tundish of the patent only has three outlets, and the molten steel flow field in the tundish is relatively stable during casting. However, if the number of outlets of the tundish is increased or the length of the tundish is increased, the flow field in the tundish is more complicated, and the stable and efficient pouring of molten steel is difficult to realize in the tundish in the patent.
Disclosure of Invention
The invention provides a long-life tundish for near-net-shaped ultrathin deformed steel continuous casting and a use method thereof, aiming at solving the defects of the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the long-life tundish for near-net-type ultrathin deformed steel continuous casting comprises a tundish body and a cavity in the tundish body, wherein the cavity is used for containing molten steel, and the tundish body consists of a pair of first side walls, second side walls and third side walls which are arranged in parallel and a ladle bottom between the first side walls, the second side walls and the third side walls; the middle part of the third side wall protrudes outwards to form an outer convex part;
the outer convex part is provided with a cylindrical retaining wall which divides the cavity into a circular impact area and a flow injection area, the upper end of the retaining wall is provided with an overflow port, and the retaining wall is provided with a retaining wall outlet;
two dams are arranged between the retaining wall and the second side wall, two ends of each dam are respectively connected with the second side wall and the retaining wall, and a dam outlet is formed in each dam; the two dams divide the flow into three zones, each zone containing a set of tundish outlets.
The thickness of the near-net-shaped ultrathin special-shaped blank web plate is 90mm.
Preferably, the outer protruding portion is in a straight plate shape or an arc shape.
Preferably, the height of the retaining wall is 440-460 mm; the thickness is 80-120 mm, and the outer diameter is 500-600 mm.
Preferably, the overflow port is a groove with an open upper end, and the shape of the groove is square, round, oval or rectangular. Preferably, the number of overflow ports is 3, and the overflow ports are uniformly distributed along the circumference of the retaining wall.
Preferably, the retaining wall outlet is square, round, oval or rectangular; the quantity of the retaining wall outlets is 2, and the retaining wall outlets are symmetrically arranged by taking a middle shaft as an axis in a top view of the tundish. The outlet direction of the retaining wall is inclined downwards, and the angle between the retaining wall and the horizontal plane is 15-25 degrees. The diameter of the outlet of the retaining wall is 60-65 mm, and the center height of the outlet of the retaining wall is 190-210 mm away from the bottom of the bag. Preferably, the cross-sectional area of the outlet of the retaining wall is greater than or equal to 1/2 of the area of the long nozzle of the tundish.
Preferably, the dam is a cuboid or trapezoid, preferably a cuboid. The included angle between the dam and the second side wall is 25-35 degrees; preferably, the dam height is 160-200 mm.
Preferably, the shape of the dam outlet is circular, oval, square or rectangular. The height of the dam outlet is 19-21 mm from the ladle bottom, the horizontal and vertical distance from the second side wall is 350-450 mm, and the diameter of the dam outlet is 59-61 mm.
Preferably, each set of tundish outlets comprises two outlets; the outlets of the three groups of tundish are uniformly arranged along the length direction of the bottom of the ladle and are positioned at the center position in the width direction.
The invention also provides a using method of the long-life tundish for near-net-shaped ultrathin deformed steel continuous casting, which comprises the following steps:
(1) Moving a long-life tundish for near-net-shaped ultrathin deformed steel continuous casting, and enabling the lower end of a water outlet of the device to correspond to the center point of a flange triangular area of an H-shaped crystallizer;
(2) Injecting molten steel into a round impact area of the tundish through a long ladle nozzle, and enabling the molten steel to flow out through a retaining wall outlet to reach tundish outlets at two ends of the tundish; the molten steel sequentially passes through a retaining wall outlet and a retaining dam outlet and reaches a tundish outlet positioned in the middle of the ladle;
when the liquid level reaches the casting liquid level, casting is started; according to the casting blank pulling speed, molten steel passes through an upper water gap and a lower water gap and is injected into an H-shaped crystallizer;
(3) Pushing the blind hole drain opening to the original drain opening through a hydraulic cylinder after pouring is finished, and blocking flow;
(4) When the drain opening reaches the use limit, the drain opening is replaced by pushing and pulling the hydraulic cylinder, and then normal production is carried out.
The invention can solve the problems of large impact and rapid erosion of the tundish wall in the ultra-thin special-shaped blank pouring process and asymmetric distribution of the tundish molten steel flow field and the temperature field, increases and stabilizes the residence time and consistency of each molten steel flow in the tundish, and enhances the inclusion removal capability, thereby improving the special-shaped blank quality, reducing the fluctuation of each casting blank quality, prolonging the service life of the tundish and realizing the stable batch production of special-shaped blank continuous casting machines at low cost.
The technical scheme of the invention has the beneficial effects that:
(1) The tundish disclosed by the invention has a simple structure, can be modified on the existing tundish, does not need to modify the original tundish cladding, and is mainly adjusted by changing the modeling of the refractory material in the tundish, so that the modification cost is low, and meanwhile, related spare parts are not increased, so that the maintenance cost is lower.
(2) Compared with the condition that the height of the retaining wall is lower than the liquid level of molten steel in the prior art, the retaining wall which is higher than the liquid level of molten steel and lower than the upper surface of the covering agent is arranged in the invention, so that on one hand, the retention time of molten steel in the tundish can be improved, the floating of inclusions is enhanced, and the purity of molten steel is improved, on the other hand, the flow field in the tundish can be improved, the consistency of the response time of each flow and the retention time of each flow of molten steel in the tundish is improved, and the stability of the quality of each casting blank is improved.
(3) The double-hole flow distribution of the retaining wall can reduce the impact of molten steel on the tundish wall, reduce the erosion of the tundish wall and prolong the service life of the tundish.
(4) The outlets of the tundish are symmetrically arranged by taking the center line of the top view of the tundish as a symmetrical axis, and the uniformity of the molten steel flow field in the tundish can be improved by combining the structural arrangement of the retaining wall and the retaining dam, so that the flow field in the tundish is further improved, the response time of each flow and the residence time of each flow of molten steel in the tundish are improved, the stability of the quality of each flow casting blank is improved, and the tundish is suitable for the tundish with smaller aperture and more outlets.
(5) The pouring nozzle is opened and poured after the pouring, the structure is simple, the cost is low, and the batch stable production of the conventional near-net-shaped ultrathin special-shaped blanks can be met.
Drawings
FIG. 1 is a schematic diagram of a tundish according to the present invention.
Fig. 2 is a top view of the tundish of the present invention.
Fig. 3 is a perspective view of a tundish retaining wall according to the present invention.
Fig. 4 is a perspective view of a tundish dam according to the present invention.
Fig. 5 is a schematic diagram of the corresponding position of the water outlet in the crystallizer according to the present invention.
Wherein: 1. the upper water gap, the lower water gap, the molten steel flowing out of the upper water gap, the lower water gap, the brick seat, the tundish body, the molten steel in the tundish, the molten steel in the crystallizer, the crystallizer and the crystallizer, 9, a dam, 10, a crystallizer central line, 11, a tundish central line, 12, a dam outlet, 13, a retaining wall, 14, an overflow port, 15, a retaining wall outlet, 16 and a tundish outlet; 17. a long nozzle pouring position; 501. a first sidewall 502, a second sidewall 503, a third sidewall 504, and an outer flange.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the long-life tundish device for near-net-shape ultrathin deformed steel continuous casting comprises a tundish body 5 and a cavity for containing molten steel in the tundish body 5, wherein the tundish body 5 consists of a pair of first side wall 501, second side wall 502, third side wall 503 and a ladle bottom arranged in parallel;
the middle part of the third side wall 503 protrudes outwards to form an outer protruding part 504, and the outer protruding part 504 is in a straight plate shape or a circular arc shape.
The outer part is provided with a cylindrical retaining wall 13, and the retaining wall 13 divides the cavity into a circular impact area and a flow injection area; the round impact area has less dead angle, and can improve the uniformity of the flow field after the ladle molten steel enters the tundish. The height of the retaining wall is higher than the liquid level of molten steel when the tundish is stably poured and lower than the upper surface of the covering agent of the tundish. The height of the retaining wall 13 is 440-460 mm; the thickness is 80-120 mm, and the outer diameter is 500-600 mm. The liquid level of the tundish is generally 420-440 mm and slightly lower than the height of the retaining wall when the tundish is stably poured.
The upper end of the retaining wall 13 is provided with an overflow port 14, and the overflow port 14 is a groove with an opening at the upper end, and the shape is preferably square, or round, oval or rectangular. When the molten steel is too high, the molten steel can overflow from the overflow port 14, and the casting powder flows in the whole ladle range from the overflow port. The number of overflow ports 14 is preferably 3 and is evenly distributed along the circumference of the wall. If the overflow port 14 is too much, molten steel can flow over the retaining wall, so that the flow field in the tundish is destroyed, and the tundish effect is reduced. If the overflow port is too small, the overflow effect is reduced.
The retaining wall 13 is provided with a retaining wall outlet 15, and the retaining wall outlet 15 can be square, round, oval or rectangular, preferably round; the number of the retaining wall outlets 15 is 2, and the retaining wall outlets are symmetrically arranged by taking a tundish top view intermediate shaft (a tundish central line 11) as an axis. The outlet direction of the retaining wall outlet 15 is inclined downwards, the angle between the retaining wall outlet 15 and the horizontal plane is 15-25 degrees, the diameter of the retaining wall outlet 15 is 60-65 mm, and the center height of the retaining wall outlet 15 is 190-210 mm away from the ladle bottom. The cross-sectional area of the retaining wall outlet 15 on the retaining wall 13 of the tundish is more than or equal to 1/2 of the area of the long nozzle of the tundish. The round impact area formed by the retaining wall 13 can fully buffer molten steel, so that the fluctuation of the liquid level of the tundish is avoided; and the disturbance to the pouring area is avoided, so that the stability of the pouring area of the tundish is facilitated. A dam 9 is arranged between the retaining wall 13 and the second side wall 502, and the dam 9 is a cuboid or a trapezoid, preferably a cuboid. The dam height is 160-200 mm; the two ends of the dam 9 are respectively connected with the second side wall 502 and the retaining wall 13.
The included angle between the dam 9 and the second side wall 502 is 25-35 degrees, and the two dams form an inverted V shape. The dam with the included angle can relieve molten steel impact, improve deformation resistance of the dam in molten steel and prolong service life of the dam. Two dams divide the flow into three zones, each zone containing a set of tundish outlets 16.
The dam 9 is provided with a dam outlet 12, and the shape of the dam outlet 12 is preferably round, or elliptical, square or rectangular. The height of the dam outlet 12 from the ladle bottom is 20mm, the horizontal and vertical distance from the second side wall 502 is 350-450 mm, and the diameter of the dam outlet 12 is 60mm; the impact of molten steel entering the middle area from two sides can be relieved, and the residence time of the molten steel in the middle part in the tundish is increased.
Each set of tundish outlets 16 includes two outlets; the three sets of tundish outlets 16 are arranged at equal intervals along the longitudinal direction of the tundish bottom, are arranged axisymmetrically with respect to the tundish top view intermediate shaft (the tundish center line 11), and are positioned at the center position in the width direction. The distance between the centers of two outlets in a group of tundish outlets is determined according to a specification, for example, the distance is 418mm when the specification of a casting blank is 575mm×450 mm; the distance is 595mm when the casting blank specification is 750mm multiplied by 370 mm; distance was 852mm at 1024mm x 390mm specification.
The tundish outlet is provided with a water inlet 1 and is fixed by a brick cup 4, and the lower end of the water inlet 1 is connected with a water outlet 2.
The application method of the long-life tundish device for near-net-type ultrathin deformed steel continuous casting comprises the following steps of:
(1) The long-life tundish for near-net-shaped ultrathin deformed steel continuous casting is connected and assembled according to the structure shown in the drawing.
(2) The long-life tundish for the continuous casting of the near-net-shaped ultrathin deformed steel is characterized in that the lower end of a water outlet of the tundish is corresponding to the center point of a flange triangular area of an H-shaped crystallizer.
Specifically, each pair of the water outlets corresponds to the center point of two flange triangular areas of one H-shaped crystallizer respectively.
(3) The ladle injects molten steel into the tundish impact area through the ladle long nozzle. For the middle injection zone portion, the molten steel passes through the outlet on the baffle wall and the baffle dam outlet in sequence to reach the tundish outlet 16. The defect that the residence time of molten steel in a pouring area in the middle of a conventional tundish is too short, namely a so-called short-circuit flow, which is unfavorable for floating inclusions is overcome. And when the liquid level of the molten steel in the tundish reaches the casting liquid level, starting casting, and injecting the molten steel into the H-shaped crystallizer through the water inlet and the water outlet according to the casting blank pulling speed. The casting liquid level is generally about 220 mm.
(4) After the pouring is finished, pushing the blind hole sewer to the original sewer through a hydraulic cylinder to block the flow.
(5) When the drain opening reaches the use limit, the drain opening is replaced by pushing and pulling the hydraulic cylinder, and then normal production is carried out.
Example 1:
the continuous casting production is carried out by using the long-life tundish device for near-net-shaped ultrathin deformed steel continuous casting, and in the embodiment, the parameters of the tundish are as follows:
the height of the retaining wall 13 is 440mm, the thickness of the retaining wall is 100mm, and the outer diameter of the retaining wall is 550mm;
the retaining wall outlet 15 is circular, the diameter is 60mm, the height from the center of the retaining wall outlet 15 to the bottom of the bag is 210mm, and the included angle between the retaining wall outlet 15 and the horizontal plane is 20 degrees;
the dam 9 has a height of 160mm, the dam outlet 12 is circular, and the diameter is 40mm; the included angle between the dam 9 and the second side wall 502 is 30 degrees;
the vertical distance from the center of the dam outlet 12 to the horizontal direction of the second side wall 502 is 400mm, and the height of the dam outlet 12 is 20mm; the diameter of the dam outlet 12 is 60mm;
the distance between the dam outlet 15 and the dam outlet 12 in the horizontal direction is 1450mm.
Example 2:
the continuous casting production is carried out by using the long-life tundish device for near-net-shaped ultrathin deformed steel continuous casting, and in the embodiment, the parameters of the tundish are as follows:
the height of the retaining wall 13 is 450mm, the thickness of the retaining wall is 80mm, and the outer diameter of the retaining wall is 500mm;
the retaining wall outlet 15 is circular, the diameter is 60mm, the height from the center of the retaining wall outlet 15 to the bottom of the bag is 200mm, and the included angle between the retaining wall outlet 15 and the horizontal plane is 15 degrees;
the dam 9 has a height of 200mm, the dam outlet 12 is round, and the diameter is 40mm; the included angle between the dam 9 and the second side wall 502 is 25 degrees;
the vertical distance from the center of the dam outlet 12 to the horizontal direction of the second side wall 502 is 350mm, and the height of the dam outlet 12 is 20mm; the diameter of the dam outlet 12 is 60mm;
the distance between the dam outlet 15 and the dam outlet 12 in the horizontal direction is 1450mm.
Example 3:
the continuous casting production is carried out by using the long-life tundish device for near-net-shaped ultrathin deformed steel continuous casting, and in the embodiment, the parameters of the tundish are as follows:
the height of the retaining wall 13 is 460mm, the thickness of the retaining wall is 120mm, and the outer diameter of the retaining wall is 600mm;
the retaining wall outlet 15 is circular, the diameter is 65mm, the center of the retaining wall outlet 15 is 190mm from the bottom of the bag, and the included angle between the retaining wall outlet 15 and the horizontal plane is 15 degrees;
the dam 9 has a height of 180mm, the dam outlet 12 is circular, and the diameter is 40mm; the included angle between the dam 9 and the second side wall 502 is 30 degrees;
the vertical distance from the center of the dam outlet 12 to the horizontal direction of the second side wall 502 is 450mm, and the height of the dam outlet 12 is 20mm; the diameter of the dam outlet 12 is 60mm;
the distance between the dam outlet 15 and the dam outlet 12 in the horizontal direction is 1450mm.
Comparative example 1:
the tundish continuous casting of the following parameters was used to produce near-net-shaped ultrathin deformed steel, and unlike example 1, the height of the retaining wall 13 of the tundish was 260mm, the retaining wall 13 was free of outlet, and no dam was provided.
Comparative example 2:
the tundish continuous casting with the following parameters was used to produce near-net-shaped ultrathin deformed steel, and the difference from example 1 is that the height of the retaining wall 13 of the tundish was 260mm, the diameter of the retaining wall outlet 15 was 25mm, the height of the retaining wall outlet 15 was 100mm, and the height of the retaining wall 9 was 50mm.
Comparative example 3:
the tundish continuous casting with the following parameters is used for producing near-net-shaped ultrathin deformed steel, and the difference is that the height of a tundish retaining wall 13 is 260mm, the diameter of a retaining wall outlet 15 is 35mm, and the height of the retaining wall outlet 15 is 80mm, compared with the embodiment 1; the dam 9 has a height of 200mm.
The near-net-shape ultrathin deformed steel billets produced in examples 1 to 3 and comparative examples 1 to 3 had a specification of 750mm×370mm, a web of 90mm, and the response times, residence times, settling times, and dead zone ratios of the respective flows are shown in table 1.
Table 1 comparison of the main effects of examples and comparative examples
As can be seen from comparison of the data in table 1, the flow differences in the three aspects of response time, average residence time and settling time of examples 1 to 3 are all significantly improved compared with the comparative example, wherein the flow differences in response time are reduced by 16.8s, the flow differences in average residence time are reduced by 64.6s, and the flow differences in settling time are reduced by 56.7s. The device has the effect of stabilizing the flow of molten steel of each flow.
As can be seen from comparing the data in Table 1, the total residence time of examples 1-3 is improved by 158.4s, and the response time of each flow is the lowest by 38 s.
Comparing the data in table 1, the dead zone volume of examples 1-3 is reduced by 16.2%, which indicates that the structural improvement of the tundish of the invention can increase the flow velocity at the far end, reduce the dead zone volume ratio and effectively improve the utilization efficiency of the tundish.
As can be seen from comparison of the data in Table 1, the continuous casting time of examples 1 to 3 is increased by 25 hours under the condition that the casting stopping maximum temperatures are basically consistent, and the service life is relatively increased by 67.7%, which indicates that after the tundish structure is changed, the molten steel flow field is more stable, the impact of molten steel on the tundish is reduced, and the impact erosion of the molten steel on the tundish working layer is reduced, so that the service life of the tundish can be prolonged.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (17)
1. The long-life tundish for near-net-shaped ultrathin deformed steel continuous casting is characterized by comprising a tundish body (5) and a cavity for containing molten steel in the tundish body (5), wherein the tundish body (5) consists of a pair of first side walls (501), second side walls (502) and third side walls (503) which are arranged in parallel and a ladle bottom arranged between the first side walls and the second side walls; the middle part of the third side wall (503) protrudes outwards to form an outer convex part;
the outer part is provided with a cylindrical retaining wall (13), the retaining wall (13) divides the cavity into a circular impact area and a flow injection area, the upper end of the retaining wall (13) is provided with an overflow port (14), and the retaining wall (13) is provided with a retaining wall outlet (15); the retaining walls (13) are higher than the liquid level of molten steel and lower than the upper surface of the covering agent, the number of retaining wall outlets (15) is 2, and the retaining walls are symmetrically arranged by taking a tundish top view intermediate shaft as an axis;
two retaining dams (9) are arranged between the retaining wall (13) and the second side wall (502), two ends of each retaining dam (9) are respectively connected with the second side wall (502) and the retaining wall (13), and a retaining dam outlet (12) is formed in each retaining dam (9); two dams (9) divide the flow section into three zones, each zone containing a set of tundish outlets (16).
2. The long life tundish for near net shape ultra thin profiled steel continuous casting of claim 1, wherein the outer flange is in the shape of a straight plate or a circular arc.
3. The long-life tundish for near-net-shape ultrathin deformed steel continuous casting according to claim 1, wherein the height of the retaining wall (13) is 440-460 mm; the thickness is 80-120 mm, and the outer diameter is 500-600 mm.
4. The long-life tundish for near-net-shape ultra-thin deformed steel continuous casting according to claim 1, characterized in that the overflow port (14) is a groove with an open upper end, and the shape of the groove is square, round, oval or rectangular.
5. The long life tundish for near net-shape ultra thin profiled steel continuous casting according to claim 4, wherein the number of overflow ports (14) is 3, and the overflow ports are uniformly distributed along the circumference of the retaining wall.
6. The long life tundish for near net shape ultra thin profiled steel continuous casting according to claim 1, characterized in that the retaining wall outlet (15) is square, round, oval or rectangular.
7. The long-life tundish for near-net-shape ultra-thin deformed steel continuous casting according to claim 1, characterized in that the direction of the retaining wall outlet (15) is obliquely downward, and the angle between the retaining wall outlet and the horizontal plane is 15-25 °.
8. The long-life tundish for near-net-shaped ultrathin deformed steel continuous casting according to claim 1, wherein the diameter of the retaining wall outlet (15) is 60-65 mm, and the center height of the retaining wall outlet (15) is 190-210 mm away from the ladle bottom.
9. The long-life tundish for near-net-shape ultra-thin deformed steel continuous casting according to claim 8, wherein the cross-sectional area of the upper retaining wall outlet (15) of the tundish retaining wall (13) is 1/2 or more of the long nozzle area of the tundish.
10. The long-life tundish for near-net-shape ultrathin deformed steel continuous casting according to claim 1, characterized in that the dam (9) is a cuboid or a trapezoid.
11. The long-life tundish for near-net-shape ultrathin deformed steel continuous casting according to claim 10, characterized in that the dam (9) is a cuboid.
12. The long life tundish for near net shape ultra thin profiled steel continuous casting according to claim 10, characterized in that the included angle between the dam (9) and the second side wall (502) is 25-35 °.
13. The long-life tundish for near-net-shape ultrathin deformed steel continuous casting of claim 10, wherein the dam height is 160-200 mm.
14. The long life tundish for near net shape ultra thin profiled steel continuous casting according to claim 1, characterized in that the dam outlet (12) is circular, oval, square or rectangular in shape.
15. The long-life tundish for near-net-shape ultrathin continuous casting according to claim 14, wherein the height of the dam outlet (12) from the bottom of the tundish is 19-21 mm, the horizontal and vertical distance from the second side wall (502) is 350-450 mm, and the diameter of the dam outlet (12) is 59-61 mm.
16. Long life tundish for continuous casting of near net-shape ultra thin profiled steel according to claim 1, characterized in that each set of tundish outlets (16) comprises two outlets; the three groups of tundish outlets (16) are uniformly arranged along the length direction of the ladle bottom and are positioned at the center position in the width direction.
17. The method for using the long-life tundish for near-net-shape ultrathin deformed steel continuous casting of any one of claims 1-16, which is characterized by comprising the following steps:
(1) Moving a long-life tundish for near-net-shaped ultrathin deformed steel continuous casting, and enabling the lower end of a water outlet of the device to correspond to the center point of a flange triangular area of an H-shaped crystallizer;
(2) Injecting molten steel into a round impact area of the tundish through a long ladle nozzle, and enabling the molten steel to flow out through a retaining wall outlet to reach tundish outlets at two ends of the tundish; the molten steel sequentially passes through a retaining wall outlet and a retaining dam outlet and reaches a tundish outlet positioned in the middle of the ladle;
when the liquid level reaches the casting liquid level, casting is started; according to the casting blank pulling speed, molten steel passes through an upper water gap and a lower water gap and is injected into an H-shaped crystallizer;
(3) Pushing the blind hole drain opening to the original drain opening through a hydraulic cylinder after pouring is finished, and blocking flow;
(4) When the drain opening reaches the use limit, the drain opening is replaced by pushing and pulling the hydraulic cylinder, and then normal production is carried out.
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