CN101658924B - Cylindrical continuous-casting tundish - Google Patents
Cylindrical continuous-casting tundish Download PDFInfo
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- CN101658924B CN101658924B CN2009101875851A CN200910187585A CN101658924B CN 101658924 B CN101658924 B CN 101658924B CN 2009101875851 A CN2009101875851 A CN 2009101875851A CN 200910187585 A CN200910187585 A CN 200910187585A CN 101658924 B CN101658924 B CN 101658924B
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Abstract
The invention relates to a cylindrical continuous-casting tundish which is composed of a cylindrical bottom surface and a cylindrical side wall; the middle part of the cylindrical bottom surface is provided with a cylindrical blocking dam, 4-12 steel taping holes are uniformly distributed on a circular bottom surface at the periphery of the cylindrical blocking dam, the centers of the steel taping holes are arranged at the same circumference on the circular bottom surface. The invention saves cost of the device by arranging the simple blocking dam, reduces the corrosion of fireproofing material, is beneficial to the production of high-quality steel products, radically solves the metallurgy problem that a rectangle or T-shaped continuous-casting tundish can not solve no matter any one current controlled structure is adopted and has wide developing prospect and great social and economic benefits.
Description
Technical field
The present invention relates to continuous casting tundish equipment, particularly a kind of cylindrical continuous-casting tundish.
Background technology
The direct casting production process of steel as connect casting ladle and continuous cast mold important metallurgical tank---the shape of tundish is in different poses and with different expressions, rectangle, triangle, V-arrangement, T shape, H shape etc. are arranged, and mainly are that the concrete condition according to conticaster and workshop designs.The billet caster tundish is generally arranged a plurality of tapping holes (mouth of a river) along the length direction of rectangle tundish for adapting to the needs of multi-stream casting, has 4,6 even 8.Each tapping hole is from the horizontal range difference of injecting tundish molten steel stream like this, thereby cause from the near tapping hole molten steel (inboard) of beam with away from tapping hole molten steel (outside) temperature differ bigger, medial and lateral beam molten steel temperature has tangible difference, has influenced normally operation smoothly of casting machine; Because the horizontal range difference of interior outside steel stream causes serious unbalanced of the time of staying of molten steel in tundish, to such an extent as to the molten steel inclusion content and the composition of each tapping hole all are very different, water the slab quality that casts out like this and also differs bigger.
Problem for above existence, many researchers have carried out big quantity research, " steel research journal " magazine in January, 2006 (the 18th volume the 1st phase 11-15 page or leaf, the physical analogy and the metallurgical effect in six stream square billet tundish flow fields, Qi Xinxia etc.) reported by masonry wall and dam in tundish, change molten steel flow state in the tundish, Anyang Steel ﹠ Iron Co., Ltd's six stream square billet tundish internal structures are optimized design, set up good tundish flow field and temperature field, solved the bleed-out in this factory's continuous casting production process, problems such as cover eye are for reducing molten steel overheat, improve watering property of molten steel, promote inclusion floating and develop new product and lay a good foundation.Simultaneously, this magazine in November, 2008 (the 20th volume o. 11th 10-14 page or leaf, six stream square billet tundish structures are optimized the experiment of water mould, Zheng Shuguo etc.) reported: by six stream billet continuous casting tundish water mould experiments, studied of the influence of different flow control devices to its flow behavior.The result shows, band cross wall and all can obviously not improve the uniformity that respectively flows flow behavior with " V " type barricade of cross wall, with not with the quantity on " V " type barricade of cross wall combination retaining dam, highly all influential to flow behavior, on more excellent " V " type barricade and retaining dam combination flow control device basis, add press down rapid device after flow control effect better." iron and steel " magazine in May, 1998 (the 33rd volume the 5th phase 24-28 page or leaf, the water model research of six stream T shape continuous casting tundish internal control stream installation optimizations, Fan Junfei etc.) reported by finding behind the hydraulic analogy six stream caster tundish, also there is deficiency in intrinsic tundish aspect the uniformity of floating foreign and temperature, can not satisfy manufacturing technique requirent well, by optimal design, proposed to promote the design of liquid steel temperature in inclusion floating and the even tundish.
In above-mentioned research, the research thinking all is to make up to reach and change the tundish flow field by the inner different flow control devices of tundish are set, and then dwindles the temperature difference of each tapping hole molten steel and the difference of the time of staying.But, for the multithread tundish, no matter it is big to take which type of control flow structure fundamentally not solve each tapping hole molten steel temperature difference yet, the problem that time of staying difference is big; And, increased cost owing to be provided with more complicated inner control flow structures such as barricade retaining dam, and also having increased refractory corrosion simultaneously, the possibility of molten steel secondary pollution also increases thereupon.
In sum, from document, patent and the open source information of having delivered, the molten steel temperature difference was bigger outside Shang Weiyou fundamentally solved in the multithread billet continuous casting tundish, molten steel composition and the serious uneven problem of inclusion content distribution.
Summary of the invention
The interior outside molten steel temperature difference that exists at existing multithread continuous casting tundish is bigger, and molten steel composition and the serious uneven problem of inclusion content distribution the invention provides a kind of cylindrical continuous-casting tundish.
Cylindrical continuous-casting tundish of the present invention is made of a rounded bottom surface and cylindrical sidewall, the middle part of rounded bottom surface is provided with a tubular retaining dam, periphery on tubular retaining dam is evenly distributed with 4～12 tapping holes on the rounded bottom surface, being centered close on the same circumference on the rounded bottom surface of each tapping hole.Tubular retaining bottom, dam connects rounded bottom surface.
The equal diameters of each above-mentioned tapping hole, the axis on the axis of the circumference at the place, center of each tapping hole and tubular retaining dam is same straight line.The diameter of tapping hole is provided with according to actual needs.
The axis on above-mentioned tubular retaining dam and the axis of rounded bottom surface are same straight line.
The volume of above-mentioned cylindrical continuous-casting tundish is provided with as required, the ratio of the height of its cylindrical sidewall and the internal diameter of cylindrical sidewall is 1: 1.8～2.2, the internal diameter on tubular retaining dam and the internal diameter ratio of cylindrical sidewall are 1: 1.5～2, the height on tubular retaining dam and the height ratio of cylindrical sidewall are 1: 3.2～3.8, and the center of each tapping hole and the horizontal range of cylindrical sidewall are 1/100～1/130 of cylindrical sidewall internal diameter.
For reducing the thermal loss of tundish surface, can clad be set at above-mentioned cylindrical continuous-casting tundish, the clad diameter is greater than the cylindrical sidewall internal diameter.
When adopting cylindrical continuous-casting tundish of the present invention to carry out direct casting, because the continuous casting tundish is a centrosymmetric structure, each tapping hole central distribution is on same circumference, so the distance of being crossed by the steel flow that flows to each tapping hole in the retaining dam equates, liquid steel temperature, inclusion content and the molten steel time of staying that can guarantee each tapping hole are identical, can solve the insurmountable problem of rectangle tundish, help the normal operation smoothly of conticaster and improve slab quality; Circular retaining dam is set in rounded bottom surface, can prevents from directly to flow to tapping hole after molten steel from entering tundish; On the cylindrical continuous-casting tundish, clad is set, can reduces the thermal loss of molten steel surface.Device of the present invention can be by being provided with simple retaining dam, reach the equally distributed effect of molten steel, compared with prior art, saved the cost of device, reduced the corrosion of refractory material, thereby the less possibility of molten steel secondary pollution in tundish helps the production of high-quality steel, has fundamentally solved rectangle or T shape continuous casting tundish and has adopted all insurmountable metallurgical problems of which kind of control flow structure.
Description of drawings
Fig. 1 is a cylindrical continuous-casting tundish structure schematic diagram of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 looks up structural representation for cylindrical continuous-casting tundish of the present invention when being connected with conticaster; Among the figure 1, rounded bottom surface, 2, cylindrical sidewall, 3, the retaining dam, 4, tapping hole, 5, conticaster, 6, the strand storage area.
Fig. 4 is under the rectangle continuous casting tundish condition, the non dimensional time-concentration curve of the tracer of each tapping hole;
Fig. 5 is under the cylindrical continuous-casting tundish condition of the present invention, the non dimensional time-concentration curve of the tracer of each tapping hole; Zone1 is the 1# tapping hole among the figure, and zone2 is the 2# tapping hole, and zone3 is the 3# tapping hole.
The specific embodiment
The internal diameter of the cylindrical continuous-casting tundish that adopts in the embodiment of the invention (internal diameter of cylindrical sidewall) guarantees that according to the number setting between the adjacent tapping hole distance satisfies adjacent conticaster roller-way required separation distance between the adjacent tapping hole.
Retaining dam in the embodiment of the invention adopts usual manner to build by laying bricks or stones on the rounded bottom surface of tundish for adopting the conventional retaining dam that uses of continuous casting tundish.
The cylindrical continuous-casting tundish structure as depicted in figs. 1 and 2, comprise rounded bottom surface and cylindrical sidewall, the middle part of rounded bottom surface is provided with tubular retaining dam, tubular retaining bottom, dam is connected with rounded bottom surface, the rounded bottom surface of tubular retaining periphery, dam is provided with 6 tapping holes, each tapping hole evenly distributes and equal diameters on rounded bottom surface, being centered close to and keeping off on the coaxial circle in dam with circular of each tapping hole; The axis on tubular retaining dam and the axis of rounded bottom surface are same axis.
The internal diameter of cylindrical sidewall is 1.635m, and the height of cylindrical sidewall is 0.85m, and height is 1: 1.92 with the ratio of internal diameter, and the internal diameter on tubular retaining dam is 0.9m, with the internal diameter ratio of cylindrical sidewall be 1: 1.82; The height on tubular retaining dam is 0.25m, with the height ratio of cylindrical sidewall be 1: 3.4; The center of each tapping hole and the horizontal range of cylindrical sidewall are 0.135m, and this horizontal range is 1/121 of a cylindrical sidewall internal diameter.
When carrying out continuous casting production, each tapping hole of cylindrical continuous-casting tundish is connected with conticaster respectively, about conticaster is divided into two groups, is made up of three conticasters for every group, as shown in Figure 3, this method to set up can solve the Layout Problem of circular continuous casting tundish in factory building.According to production requirement, the number of opening tapping hole is 1,2,3,4 or 6, and when the number of wherein opening tapping hole was 2,3 or 4, each tapping hole of opening was that the center evenly distributes with the rounded bottom surface center.
Adopt said apparatus to carry out continuous casting production, molten steel enters in the retaining dam of continuous casting tundish from the long nozzle of continuous casting ladle, on rounded bottom surface evenly to around scatter, long-pending completely keep off the dam after, molten steel overflows from the retaining dam and flows to each tapping hole, by the flow of molten steel in the stopper adjusting tapping hole, molten steel enters conticaster crystallizer through tapping hole.Because the cylindrical continuous-casting tundish is a centrosymmetric structure, flow field, temperature, composition, the time of staying and the inclusion content of molten steel are all consistent in each tapping hole.And do not have tangible thermal stratification phenomenon in the cylindrical continuous-casting tundish, compare with the rectangle tundish, the piston region volume fraction of molten steel improves 7%, and the dead space volume mark of molten steel reduces by 5%.
Select three tapping holes of continuous casting tundish, adopt the stimuli responsive method to analyze the mean residence time and the average response time of each tapping hole of cylindrical continuous-casting tundish, non dimensional time-the concentration curve (time of staying scatter chart) that obtains respectively as shown in Figure 4 and Figure 5, wherein Fig. 4 is under the rectangle continuous casting tundish condition, the non dimensional time-concentration curve of the tracer of each tapping hole; Fig. 5 is under the cylindrical continuous-casting tundish condition, the non dimensional time-concentration curve of the tracer of each tapping hole.Record the mean residence time and the average response time of each tapping hole respectively according to non dimensional time-concentration curve, and piston region mean volume fraction and dead band mean volume fraction, and adopting rectangle continuous casting tundish to compare experiment, the result is as shown in table 1.
Table 1
| Tmin 1 | Tmin 2 | Tmin 3 | Ta 1 | Ta 2 | Ta 3 | V p | V d | V p/V d | |
| Circular tundish | 101 | 101 | 101 | 583 | 583 | 583 | 0.1726 | 0.2013 | 0.857 |
| The rectangle tundish | 20 | 60 | 171 | 461 | 649 | 1008 | 0.102 | 0.251 | 0.427 |
Tmin wherein
1The response time of-1# tapping hole, Tmin
2The response time of-2# tapping hole, Tmin
3The response time of-3# tapping hole, the described response time be tracer with molten steel from entering tundish to the used time of tapping hole; Ta
1The actual time of staying of-1# tapping hole, Ta
2The actual time of staying of-2# tapping hole, Ta
3The actual time of staying of-3# tapping hole, the described actual time of staying is that tracer enters tundish to the average time of all leaving tapping hole with molten steel; V
pBe tundish inner carrier district mean volume fraction, V
dBe dead space volume mark in the tundish.
By above-mentioned test, when proof adopted the cylindrical continuous-casting tundish to carry out continuous casting production, the temperature in the tundish is more even: when adopting the rectangle tundish, each tapping hole temperature difference reached 8～10 ℃, the thermal stratification phenomenon is more serious, and the surface temperature and the tapping hole temperature difference are 7～8 ℃; Temperature Distribution is more even in the drum shape tundish, and each tapping hole temperature is identical, does not have the thermal stratification phenomenon, and surface temperature and tapping hole temperature difference are 2～3 ℃.
The cylindrical continuous-casting tundish structure is with embodiment 1, and difference is that the rounded bottom surface of tubular retaining periphery, dam is provided with 4 tapping holes, being centered close to and keeping off on the coaxial circle in dam with circular of each tapping hole.
The internal diameter of cylindrical sidewall is 1.68m, and the height of cylindrical sidewall and the ratio of internal diameter are 1: 2.2, and the internal diameter ratio of the internal diameter cylindrical sidewall on tubular retaining dam is 1: 2; The height on tubular retaining dam and the height ratio of cylindrical sidewall are 1: 3.2; The center of each tapping hole and the horizontal range of cylindrical sidewall are 1/100 of cylindrical sidewall internal diameter.
Carry out continuous casting when producing, each tapping hole of cylindrical continuous-casting tundish is connected with conticaster respectively, about conticaster is divided into two groups, is made up of two conticasters for every group.According to production requirement, the number of opening tapping hole is 1,2 or 4, and when the number of wherein opening tapping hole was 2, each tapping hole of opening was that the center evenly distributes with the rounded bottom surface center.
Adopt said apparatus to carry out continuous casting production, molten steel enters in the retaining dam of continuous casting tundish from the long nozzle of continuous casting ladle, on rounded bottom surface evenly to around scatter, long-pending completely keep off the dam after, molten steel overflows and flows to each tapping hole from keeping off the dam.Because the cylindrical continuous-casting tundish is a centrosymmetric structure, flow field, temperature, composition, the time of staying and the inclusion content of molten steel are all consistent in each tapping hole.And do not have tangible thermal stratification phenomenon in the cylindrical continuous-casting tundish, compare with the rectangle tundish, the piston region volume fraction of molten steel improves, and the dead space volume mark of molten steel reduces.
The cylindrical continuous-casting tundish structure is with embodiment 1, and difference is that rounded bottom surface is provided with 12 tapping holes, each tapping hole be centered close to one with the coaxial circle in circular retaining dam on.
The internal diameter of cylindrical sidewall is 1.7m, and the height of cylindrical sidewall and the ratio of internal diameter are 1: 1.8, and the internal diameter ratio of the internal diameter cylindrical sidewall on tubular retaining dam is 1: 1.5; The height on tubular retaining dam and the height ratio of cylindrical sidewall are 1: 3.8; The center of each tapping hole and the horizontal range of cylindrical sidewall are 1/120 of cylindrical sidewall internal diameter.
For reducing the thermal loss on molten steel surface, be provided with clad at the cylindrical continuous-casting tundish, the lower surface of clad is connected with the cylindrical sidewall top, and clad is a circular plate type, and diameter is 1.72m.
Carry out continuous casting when producing, each tapping hole of cylindrical continuous-casting tundish is connected with conticaster respectively, about conticaster is divided into two groups, is made up of 6 conticasters for every group.According to production requirement, the number of opening tapping hole is 1,2,3,4,6 or 12, and when the number of wherein opening tapping hole was 2,3,4 or 6, each tapping hole of opening was that the center evenly distributes with the rounded bottom surface center.
Adopt said apparatus to carry out continuous casting production, molten steel enters in the retaining dam of continuous casting tundish from the long nozzle of continuous casting ladle, on rounded bottom surface evenly to around scatter, long-pending completely keep off the dam after, molten steel overflows and flows to each tapping hole from keeping off the dam.Because the cylindrical continuous-casting tundish is a centrosymmetric structure, flow field, temperature, composition, the time of staying and the inclusion content of molten steel are all consistent in each tapping hole.And do not have tangible thermal stratification phenomenon in the cylindrical continuous-casting tundish, compare with the rectangle tundish, the piston region volume fraction of molten steel improves, and the dead space volume mark of molten steel reduces.
Claims (3)
1. cylindrical continuous-casting tundish, it is characterized in that constituting by a rounded bottom surface and cylindrical sidewall, the middle part of rounded bottom surface is provided with a tubular retaining dam, periphery on tubular retaining dam, be evenly distributed with 4～12 tapping holes on the rounded bottom surface, being centered close on the same circumference on the rounded bottom surface of each tapping hole; The equal diameters of described each tapping hole, the axis on the axis of the circumference at the place, center of each tapping hole and tubular retaining dam is same straight line.
According to claim 1 described a kind of cylindrical continuous-casting tundish, it is characterized in that the axis on described tubular retaining dam and the axis of rounded bottom surface are same straight line.
According to claim 1 described a kind of cylindrical continuous-casting tundish, the ratio that it is characterized in that the internal diameter of the height of cylindrical sidewall of described cylindrical continuous-casting tundish and cylindrical sidewall is 1: 1.8～2.2, the internal diameter on tubular retaining dam and the internal diameter ratio of cylindrical sidewall are 1: 1.5～2, the height on tubular retaining dam and the height ratio of cylindrical sidewall are 1: 3.2～3.8, and the center of each tapping hole and the horizontal range of cylindrical sidewall are 1/100～1/130 of cylindrical sidewall internal diameter.
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| CN2009101875851A CN101658924B (en) | 2009-09-24 | 2009-09-24 | Cylindrical continuous-casting tundish |
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| CN2009101875851A CN101658924B (en) | 2009-09-24 | 2009-09-24 | Cylindrical continuous-casting tundish |
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| CN101658924B true CN101658924B (en) | 2011-05-25 |
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