CN103949629A - Ladle bottom structure capable of reducing continuous casting ladle cast residues - Google Patents
Ladle bottom structure capable of reducing continuous casting ladle cast residues Download PDFInfo
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- CN103949629A CN103949629A CN201410150457.0A CN201410150457A CN103949629A CN 103949629 A CN103949629 A CN 103949629A CN 201410150457 A CN201410150457 A CN 201410150457A CN 103949629 A CN103949629 A CN 103949629A
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- plane
- ladle
- ladle bottom
- flat surface
- continuous casting
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Abstract
The invention relates to a ladle bottom structure capable of reducing continuous casting ladle cast residues. The ladle bottom structure is characterized in that a ladle bottom and ladle walls form a ladle inner cavity together; the ladle bottom structure comprises a first flat surface, a second flat surface and a transition curved surface; the first flat surface is internally provided with a ladle outlet; the second flat surface is internally provided with a vent brick; the second flat surface is higher than the first flat surface; the transition curved surface is connected with the first flat surface and the second flat surface. The ladle bottom structure has the following advantages: (1) ladle cast residues can be greatly reduced, and the cast residues can be reduced by above 70% on the premise of preventing ladle slagging; (2) the transition between the second flat surface and the first flat surface is smooth, so that circulation flow of molten steel in a low-lying area during an argon blowing process can be ensured; (3) the ladle bottom structure is relatively simple, less in construction difficulty and low in maintenance cost.
Description
Technical field
The present invention relates to a kind of structure of ladle bottom, be specifically related to a kind of structure of ladle bottom that can reduce the large Bao Zhuyu of continuous casting, belong to metal material and processing technique field.
Background technology
Large bag is one of main equipment of continuous casting production, is mainly used to hold molten steel, and molten steel surface has refining slag to cover.Large bag stores and transports molten steel except being used for, and also has a series of liquid steel refining functions such as Argon stirring, temperature adjusting, composition adjustment, Control and Inclusion Removal.In casting process, molten steel flows out and enters crystallizer through tundish from the outlet of large bag, and under continuous throwing and continuous cooling condition, the strand that forms required form is also cut into scale, becomes the blank of steel rolling.After unwrapping greatly and watering, along with the carrying out of cast, the molten steel in large bag reduces gradually, and liquid steel level reduces gradually.When liquid level drops to a certain degree, at bag, bottom outlet place just forms the whirlpool that confluxes, and makes refining slag and molten steel volume flow out into tundish together with mixing, and molten steel is polluted, and then reduced the cleanliness factor of continuous casting billet.
Bale slag-blanking is one of important sources of steel inclusion, has a strong impact on some quality to the extremely strict steel grade of field trash requirement, as increased the fracture of wire frequency of cord steel in drawing process, making the surface of the deep punching steels such as DI tank and IF steel occur pit etc.For fear of lower slag, at large bag, pour into a mould latter stage, conventionally retain a certain amount of large Bao Zhuyu, before the whirlpool that confluxes is formed on large bag bottom, close slide gate nozzle, change another Baogang's water continuation cast.Large Bao Zhuyu is more, and the possibility of lower slag is less, but the recovery rate of molten steel is also just lower.For accurately the time started of the lower slag of judgement also closes in time and contracts out greatly mouth, so that can control lower slag reduces more than casting again as much as possible, except adopting manual observation, a series of bale slag-blanking automatic testing methods have also been developed, as electromagnetic detection method, oscillatory type detection method, the detection method of weighing, ultrasonic Detection Method, Infrared Detection Method etc., yet, large bag at present both domestic and external bottom is that plane is built by laying bricks or stones mostly, allow to accurately judge the time started of bale slag-blanking, also have larger casting surplus, affect the recovery rate of molten steel.Therefore, a kind of new technical scheme of exigence solves the problems of the technologies described above.
Summary of the invention
The present invention is just for the problem existing in current technology, a kind of compound large bag polycrystalline substance is provided, this structural design is ingenious, convenient to be implemented, avoiding under the prerequisite of bale slag-blanking, can significantly reduce large Bao Zhuyu, improve the recovery rate of molten steel, the continuous casting that is applicable to each steel grade is produced, and is particularly useful for the continuous casting of the high steel grade of cleanliness factor requirement to produce.
To achieve these goals, the technical solution used in the present invention is as follows, a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting, it is characterized in that, at the bottom of described bag, form large bag inner chamber together with bag wall, described structure of ladle bottom comprises the first plane, the second plane and fillet surface, in described the first plane, be provided with and contract out greatly mouth, in described the second plane, be provided with air brick, described the second plane is higher than the first plane, described fillet surface is arranged between the first plane and the second plane, for connecting the first plane and the second plane.Between the first plane and the second plane, transition is mild, guaranteed circulating of low laying areas molten steel in Argon process, avoids forming dead band, prevented molten steel local overcooling and causes outlet to be freezed.
As a modification of the present invention, described the first plane and the second plane parallel.
As a modification of the present invention, described the first plane is two zonules that minor arc surrounds, and its center is provided with and contracts out greatly mouth; This design can reduce large Bao Zhuyu to a greater extent.
As a modification of the present invention, described the second plane is the large region that two major arcs surround.This design can reduce large Bao Zhuyu to a greater extent.
As a modification of the present invention, the height difference H of described the second plane and the first plane is the critical lower slag liquid level of large bag, and the height of H is 100mm ~ 300mm, can by water mould, be tested or numerical simulation calculation is determined according to cast parameter.Under this height, stop cast, can on the basis of not wasting large bag inner chamber capacity, reduce to greatest extent large Bao Zhuyu.
As a modification of the present invention, between described the first plane and the second plane, with the mild surface blending of the gradient, the angle of fillet surface and first and second plane is 160 ° ~ 180 °.This design has guaranteed circulating of low lying areas molten steel in Argon whipping process, prevents in formation dead band, low lying areas.
As a modification of the present invention, the quantity of described air brick is at least one.
With respect to prior art, advantage of the present invention is as follows, and (1) can significantly reduce large Bao Zhuyu, in critical lower slag liquid level, stops cast, can reduce more than more than 70% casting; Between (2) first planes and the second plane, transition is mild, and the first plane has certain area, guaranteed circulating of low laying areas molten steel in Argon process, avoids forming dead band, prevented molten steel local overcooling and causes outlet to be freezed; (3) structure of ladle bottom is simpler, builds difficulty by laying bricks or stones little, and maintenance cost is low.
accompanying drawing explanation:
Fig. 1 is common large bag inner-cavity structure figure;
Fig. 2 is slag schematic diagram under common large bag casting latter stage;
Fig. 3 is large bag inner-cavity structure figure provided by the invention;
Fig. 4 is slag schematic diagram under large bag casting provided by the invention latter stage.
In figure: 1 is bag wall, 2 be plane bag at the bottom of, 3 is air brick, 4 for contracting out greatly mouth, 5 is the first plane, 6 is fillet surface, 7 is the second plane.
The specific embodiment
In order to deepen the understanding of the present invention and understanding, below in conjunction with accompanying drawing, the invention will be further described and introduction.
embodiment 1: referring to Fig. 3, a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting, at the bottom of described bag, form large bag inner chamber together with bag wall 1, described structure of ladle bottom comprises the first plane 5, the second plane 7 and fillet surface 6, in described the first plane 5, be provided with and contract out greatly mouth 4, in described the second plane 7, be provided with air brick 3, described the second plane 7 is higher than the first plane 5, described fillet surface 6 is arranged between the first plane 5 and the second plane 7, and described fillet surface 6 connects the first plane 5 and the second plane 7.Between the first plane 5 and the second plane 7, transition is mild, guaranteed circulating of low laying areas molten steel in Argon process, avoids forming dead band, prevented molten steel local overcooling and causes outlet to be freezed.
embodiment 2: referring to Fig. 3, as a modification of the present invention, described the first plane 5 is parallel with the second plane 7.All the other structures are identical with embodiment 1 with advantage.
embodiment 3: referring to Fig. 3, as a modification of the present invention, described the first plane 5 be two minor arcs surround compared with zonule, to reduce to a greater extent large Bao Zhuyu, its center is for contracting out greatly mouthfuls 4.All the other structures are identical with embodiment 1 with advantage.
embodiment 4: referring to Fig. 3, as a modification of the present invention, described the second plane 7 is larger regions that two major arcs surround, to reduce to a greater extent large Bao Zhuyu.All the other structures are identical with embodiment 1 with advantage.
embodiment 5: referring to Fig. 3, Fig. 4, as a modification of the present invention, the difference in height of described the second plane 7 and the first plane 5 is the critical lower slag liquid level H of large bag, and the height of H is 100mm ~ 300mm, can by water mould, be tested or numerical simulation calculation is determined according to cast parameter.This difference in height can significantly reduce large Bao Zhuyu, in critical lower slag liquid level, stops cast, can reduce more than more than 70% casting.According to casting process parameter, by simulated experiment, drawn.All the other structures are identical with embodiment 1 with advantage.
embodiment 6: referring to Fig. 3, as a modification of the present invention, between described the first plane 5 and the second plane 7, with mild fillet surface 6 transition of the gradient, the angle of fillet surface 6 and the first plane 5, the second plane 7 is 160 °-180 °, prevents in Argon whipping process in formation dead band, low lying areas.All the other structures are identical with embodiment 1 with advantage.
The present invention can also be combined to form new embodiment by least one and embodiment 1 in technical characterictic described in embodiment 2,3,4,5,6.
operation principle:
Referring to Fig. 2, Fig. 4, in large bag casting latter stage, when liquid level just forms the whirlpool that confluxes during lower than the critical altitude H of lower slag in exit, refining slag and the amalgamation of molten steel volume rise from exporting 4 outflows.The size of H value can be tested or numerical simulation calculation obtains by hydraulic analogy.For preventing that lower slag from polluting the molten steel in tundish, now should close outlet and change a bag pouring molten steel, and residue molten steel in large bag is just called more than casting.Generally remaining the pouring out of casting done to steel scrap processing after cooling from large bag.
Referring to Fig. 1, Fig. 2, in prior art, common large bag inner chamber comprises at the bottom of wall 1, plane bag 2, at the bottom of plane bag, air brick 3 and outlet 4 is being set on 2; When the critical altitude H of liquid level in lower slag, close outlet 4, the bag end, still remains more molten steel, therefore has more casting surplus.
Referring to Fig. 3, Fig. 4, by change, wrap the masonry way of end refractory material, build into the bag end by laying bricks or stones the first plane 5 of the present invention, the second plane 7 and fillet surface 6 form composite structured; The first plane 5 is surrounded by two minor arcs, and position is lower, area is less, and large Bao Zhuyu, for contracting out greatly mouth 4, can be reduced to a greater extent in its center; The second plane 7 is that two major arcs surround, and position is higher, and area is larger, and air brick 3 is arranged in the second plane 7; Between the second plane 7 and the first plane 5, with the mild fillet surface 6 of the gradient, be connected; The critical altitude H that the difference in height of the second plane 7 and the first plane 5 is lower slag.When the critical altitude H of liquid level in lower slag, close outlet 4, remaining molten steel amount reduces greatly at the bag end, therefore casts surplus and also greatly reduces.In addition, because large bag has also been born refining function, the change of structure of ladle bottom may affect flowing of molten steel at the bottom of refining Argon process bag; But because fillet surface 6 gradients in the present invention are very mild, and the critical altitude H of lower slag is generally smaller, general 200mm left and right, can effectively prevent in Argon whipping process in formation dead band, low lying areas.
The large bag of the 120t of Yi Mou steel mill is that example illustrates concrete implementation result of the present invention.By redesign, wrap end brick shape and size, will wrap greatly bottom and build into superpacket bottom structure by laying bricks or stones, building process is without difficulty, and baking, circulation etc. are identical with before transformation.Under current process conditions, by hydraulic analogy, test and show that the critical lower slag liquid level that large bag is cast latter stage is about 150mm.While building by laying bricks or stones at the bottom of use plane bag, large Bao Zhuyu is about 6.71t; Use after superpacket bottom structure, large Bao Zhuyu is about 1.70t, and casting surplus approximately reduces 75%, and molten steel recovery rate approximately improves 4.2%.
It should be noted that above-described embodiment is only preferred embodiment of the present invention; be not used for limiting protection scope of the present invention; being equal to replacement or substituting of having done on the basis of above-described embodiment all belongs to protection scope of the present invention, and protection scope of the present invention is as the criterion with claims.
Claims (7)
1. a structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting, it is characterized in that, at the bottom of described bag, form large bag inner chamber together with bag wall, described structure of ladle bottom comprises the first plane, the second plane and fillet surface, in described the first plane, be provided with and contract out greatly mouth, in described the second plane, be provided with air brick, described the second plane is higher than the first plane, described fillet surface is arranged between the first plane and the second plane, for connecting the first plane and the second plane.
2. a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting according to claim 1, is characterized in that, described the first plane and the second plane parallel.
3. a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting according to claim 1, is characterized in that, described the first plane is two zonules that minor arc surrounds, and its center is provided with and contracts out greatly mouth.
4. according to a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting described in claim 1 or 2 or 3, it is characterized in that, described the second plane is the large region that two major arcs surround.
5. according to a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting described in claim 1 or 2 or 3, it is characterized in that, between described the first plane and the second plane, with the mild surface blending of the gradient, the angle of fillet surface and first and second plane is 160 ° ~ 180 °.
6. a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting according to claim 1, is characterized in that, the quantity of described air brick is at least one.
7. a kind of structure of ladle bottom that reduces the large Bao Zhuyu of continuous casting according to claim 5, is characterized in that, the height difference H of described the second plane and the first plane is the critical lower slag liquid level of large bag, and the height of H is 100mm ~ 300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410150457.0A CN103949629A (en) | 2014-04-16 | 2014-04-16 | Ladle bottom structure capable of reducing continuous casting ladle cast residues |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410150457.0A CN103949629A (en) | 2014-04-16 | 2014-04-16 | Ladle bottom structure capable of reducing continuous casting ladle cast residues |
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| CN103949629A true CN103949629A (en) | 2014-07-30 |
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| CN201410150457.0A Pending CN103949629A (en) | 2014-04-16 | 2014-04-16 | Ladle bottom structure capable of reducing continuous casting ladle cast residues |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102748A (en) * | 2019-05-06 | 2019-08-09 | 共享铸钢有限公司 | A method of improving steel-casting casting quality |
| CN112207268A (en) * | 2020-10-21 | 2021-01-12 | 武汉钢铁有限公司 | Circular vortex-resisting device for bottom of steel ladle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07236966A (en) * | 1994-02-28 | 1995-09-12 | Daido Steel Co Ltd | Ladle bottom surface structure |
| JP2010188405A (en) * | 2009-02-20 | 2010-09-02 | Kobe Steel Ltd | Method for reducing amount of residual steel in ladle |
| CN201702360U (en) * | 2010-07-02 | 2011-01-12 | 武汉钢铁(集团)公司 | Steel ladle with slope-shaped ladle bottom |
| CN102078957A (en) * | 2010-12-24 | 2011-06-01 | 莱芜钢铁股份有限公司 | Continuous casting tundish for improving cleanliness of molten steel |
| CN203197232U (en) * | 2013-04-28 | 2013-09-18 | 浙江自立股份有限公司 | Steel ladle bottom structure capable of effectively reducing amount of residual molten steel of steel ladle |
| CN203830716U (en) * | 2014-04-16 | 2014-09-17 | 张家港联峰钢铁研究所有限公司 | Ladle bottom structure capable of reducing continuous casting big ladle casting wastes |
-
2014
- 2014-04-16 CN CN201410150457.0A patent/CN103949629A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07236966A (en) * | 1994-02-28 | 1995-09-12 | Daido Steel Co Ltd | Ladle bottom surface structure |
| JP2010188405A (en) * | 2009-02-20 | 2010-09-02 | Kobe Steel Ltd | Method for reducing amount of residual steel in ladle |
| CN201702360U (en) * | 2010-07-02 | 2011-01-12 | 武汉钢铁(集团)公司 | Steel ladle with slope-shaped ladle bottom |
| CN102078957A (en) * | 2010-12-24 | 2011-06-01 | 莱芜钢铁股份有限公司 | Continuous casting tundish for improving cleanliness of molten steel |
| CN203197232U (en) * | 2013-04-28 | 2013-09-18 | 浙江自立股份有限公司 | Steel ladle bottom structure capable of effectively reducing amount of residual molten steel of steel ladle |
| CN203830716U (en) * | 2014-04-16 | 2014-09-17 | 张家港联峰钢铁研究所有限公司 | Ladle bottom structure capable of reducing continuous casting big ladle casting wastes |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102748A (en) * | 2019-05-06 | 2019-08-09 | 共享铸钢有限公司 | A method of improving steel-casting casting quality |
| CN112207268A (en) * | 2020-10-21 | 2021-01-12 | 武汉钢铁有限公司 | Circular vortex-resisting device for bottom of steel ladle |
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Application publication date: 20140730 |
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