CN107983944B - Method and device for reducing molten steel casting allowance in continuous casting process - Google Patents
Method and device for reducing molten steel casting allowance in continuous casting process Download PDFInfo
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- CN107983944B CN107983944B CN201810038562.3A CN201810038562A CN107983944B CN 107983944 B CN107983944 B CN 107983944B CN 201810038562 A CN201810038562 A CN 201810038562A CN 107983944 B CN107983944 B CN 107983944B
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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
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/004—Retaining slag during pouring molten metal by using filtering means
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
Abstract
The invention belongs to the technical field of ferrous metallurgy, and discloses a method and a device for reducing molten steel casting allowance in a continuous casting process. The device for reducing molten steel casting allowance in the continuous casting process comprises a dipping cover, wherein the dipping cover is a truncated cone-shaped vacuum dipping cover. The height of the vacuum dipping cover is 400-700 mm, the cross section of the top is round, and the diameter is 150-500 mm; the diameter of the circular cross section of the bottom is 200-600 mm. At the end of pouring of the ladle or tundish, a truncated cone-shaped vacuum dipping cover is placed in the molten steel right above the ladle nozzle or tundish nozzle. The device and the method can effectively avoid the phenomenon that the vortex slag is rolled up to pollute the molten steel. The vacuum dipping cover not only can play a slag blocking effect, but also can not obviously block the flow of molten steel, thereby being beneficial to the stable and efficient operation of continuous casting.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method and a device for reducing molten steel casting allowance in a continuous casting process.
Background
The casting residue in the continuous casting process comprises ladle casting residue and tundish casting residue. At the end of pouring of the ladle or the tundish, along with the drop of the liquid level of molten steel, in order to prevent vortex slag-rolling, when the ladle or the tundish is not poured completely, a steel tapping hole is closed, and the ladle or the tundish with casting residual steel is hoisted away. In general, the steel ladle will be left with casting steel residue with the liquid level height of 50-75 mm, and the tundish will be left with casting steel residue with the liquid level height of 200-300 mm.
In the later casting period, as the liquid level of molten steel is lowered, confluence vortex is generated at the interface of steel slag, and the phenomenon of vortex slag entrainment is caused by emulsification of the slag steel. The converging vortex is that during the draining process of the container, liquid first descends vertically to certain height, and when the liquid descends to certain height, the liquid begins to converge toward the central line of the outflow port and forms concave vortex on the slag layer surface. The swirling slag can pollute molten steel and cause the degradation of steel quality.
In the continuous casting process, there is a report that slag is prevented from being swirled by throwing a slag-stopping ball into a ladle, but in order to play a role in separating slag, the diameter of the slag-stopping ball needs to be about 2 times that of a ladle nozzle, and because the slag-stopping ball is large in size, when the liquid level of molten steel is low, the slag-stopping ball falls above the nozzle, the spherical structure of the slag-stopping ball is matched with the circular tubular structure of the nozzle, and the slag-stopping ball can block a part of the nozzle, so that the casting speed is reduced, fluctuation of the liquid level of molten steel in a tundish is caused, and the production rhythm of continuous casting is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for reducing molten steel casting allowance in a continuous casting process.
An apparatus for reducing molten steel casting allowance in a continuous casting process includes a dipping cover.
The dipping cover is a truncated cone-shaped vacuum dipping cover. The height of the vacuum dipping cover is 400-700 mm.
The diameter of the circular cross section of the top of the vacuum impregnation cover is 150-500 mm; the diameter of the circular cross section of the bottom of the vacuum dipping cover is 200-600 mm.
The truncated cone-shaped vacuum impregnation cover has an inner layer and an outer layer. The inner layer structure of the vacuum impregnation cover is a hollow truncated cone-shaped refractory material with an opening at the bottom and a sealing top, the material is corundum, the bottom of the hollow truncated cone-shaped refractory material is a sawtooth-shaped circular ring, and the height of the sawtooth is 10-20 mm; the outer layer structure of the vacuum impregnation cover is a hollow truncated cone-shaped device with sealed bottom and top, the material is a thin steel plate, and the bottom of the outer layer structure is provided with a vacuumizing pipeline and a valve.
Before the vacuum dipping cover is used, the vacuum dipping cover is vacuumized by utilizing vacuumizing equipment, and the valve is closed.
The invention relates to a method for reducing molten steel casting allowance in a continuous casting process, which comprises the following steps: and placing a truncated cone-shaped vacuum dipping cover in molten steel right above a ladle nozzle or a tundish nozzle at the end of pouring of the ladle or the tundish, wherein the height of the vacuum dipping cover is 400-700 mm. Before the vacuum dipping cover is placed into molten steel, the interior of the vacuum dipping cover is in a vacuum state, after the vacuum dipping cover is placed into the molten steel, the bottom of the vacuum dipping cover is melted away by the molten steel, the molten steel is pressed into the vacuum dipping cover under the influence of atmospheric pressure, and the liquid level of the molten steel in the vacuum dipping cover is increased. The vacuum dipping cover is arranged above the water gap, so that the molten steel liquid level with the height of 400-700 mm is still arranged above the water gap at the end of pouring of the ladle or the tundish, the local high-liquid-level pouring is realized, and the vortex slag-rolling phenomenon still cannot occur at the end of pouring.
Preferably, at the end of pouring of the ladle or the tundish, the vacuum dipping cover is lifted into the molten steel above the ladle nozzle or the tundish nozzle by a small electromagnetic crane, the vacuum dipping cover can drain the top slag on the molten steel liquid surface, the outer layer structure of the steel sheet is melted by the molten steel in the descending process of the vacuum dipping cover, the molten steel is pressed into the vacuum dipping cover from the bottom of the vacuum dipping cover under the action of atmospheric pressure, and the molten steel is pressed into the vacuum dipping cover under the action of atmospheric pressure, and the vacuum dipping cover is positioned right above the nozzle, so that the molten steel liquid level above the nozzle is still 400-700 mm as the molten steel liquid level above the nozzle is still the vacuum dipping cover at the end of pouring. At such high liquid level, the phenomenon of vortex slag rolling does not occur basically, and even if slag flows into the vacuum impregnation hood, the slag flowing from the bottom of the vacuum impregnation hood floats upwards to the top of the impregnation hood due to the higher liquid level of molten steel in the impregnation hood.
Preferably, a truncated cone-shaped vacuum dipping cover is placed right above the ladle nozzle or the tundish nozzle at the end of pouring of the ladle or the tundish when the liquid level of molten steel is lower than 200-400 mm.
Preferably, at the end of pouring of the ladle or tundish, when the liquid level of molten steel is lower than 200-400 mm, the vacuum dipping cover is lifted above the ladle nozzle or tundish nozzle by a small electromagnetic crane, and the vacuum dipping cover is lowered into the molten steel at a speed of 5-15 mm/s.
Preferably, when the vacuum impregnation hood is applied to pouring of the tundish, the tundish stops pouring when the liquid level in the tundish is lower than 30-50 mm.
After the vacuum impregnation hood descends to the bottom of the ladle or the tundish, the serrated circular ring at the bottom of the hollow truncated cone-shaped refractory material plays a role of supporting the vacuum impregnation hood, and molten steel flows into the vacuum impregnation hood from serrated gaps. When the vacuum dipping cover is applied to pouring of the steel ladle, when the liquid level in the steel ladle is lower than the height of the saw teeth, the pouring of the molten steel in the heat is stopped. When the vacuum dipping cover is applied to pouring of the tundish, the pouring of the tundish is stopped when the liquid level in the tundish is lower than 30-50 mm.
THE ADVANTAGES OF THE PRESENT INVENTION
1. At the end of pouring, the liquid level of molten steel in the vacuum dipping cover above the water gap is very high and is higher than the liquid level of the molten steel with critical rotation, a confluence vortex is not formed, slag around the vacuum dipping cover is not involved in the molten steel, and the phenomenon that vortex slag is wound to pollute the molten steel can be avoided.
2. The vacuum dipping cover can drain slag above the water gap, can play the same slag blocking effect as a slag blocking ball, and the bottom shape of the vacuum dipping cover is a zigzag ring, so that the blocking effect on molten steel is limited, the molten steel can flow into the water gap through a zigzag gap at a higher speed, the vacuum dipping cover can play the slag blocking effect and can not obviously block the flow of the molten steel, and the continuous casting stable and efficient operation is facilitated.
3. Due to the vacuum dipping cover, the problem of vortex slag rolling is solved, the phenomenon of vortex slag rolling can not occur under the condition of lower liquid level height of molten steel, low liquid level pouring of the molten steel can be realized, the casting allowance of the molten steel can be reduced by more than 60%, the steel yield is increased, and resources are saved.
Description of the drawings:
FIG. 1 is a cross-sectional view of the vacuum impregnation hood during use.
Fig. 2 is a view showing the structure of an inner layer of the vacuum impregnation hood.
Fig. 3 is a schematic diagram showing an outer layer structure of the vacuum impregnation hood.
Wherein: 1: an outer layer of the vacuum impregnation hood; 2: an inner layer of the vacuum impregnation hood; 3: slag; 4: molten steel; 5: slag flowing into the vacuum impregnation hood; the method comprises the steps of carrying out a first treatment on the surface of the 6: a water gap; 11: the top of the outer layer device of the vacuum dipping cover; 12: the bottom of the outer layer device of the vacuum dipping cover; 13: a vacuum pumping pipeline; 14: a valve; 21: the top of the vacuum dipping cover inner layer device; 22: a zigzag ring.
The specific embodiment is as follows:
at the end of pouring of a ladle or a tundish, when the liquid level of molten steel is lower than 200-400 mm, a truncated cone-shaped vacuum dipping cover is placed right above a ladle nozzle or a tundish nozzle, the height of the vacuum dipping cover is 400-700 mm, the bottom diameter is 200-600 mm, the top diameter is 150-500 mm, the structure of the truncated cone-shaped vacuum dipping cover is divided into an inner layer and an outer layer, the inner layer 2 of the vacuum dipping cover is hollow truncated cone-shaped refractory material with an opening at the bottom and a sealed top and made of corundum, the bottom of the hollow truncated cone-shaped refractory material is a saw-tooth-shaped circular ring 22, the height of saw teeth is 10-20 mm, the outer layer of the vacuum dipping cover is a hollow truncated cone-shaped device with both the sealed bottom and the sealed top, the vacuum dipping cover is made of a thin steel plate, a vacuumizing pipeline 13 and a valve 14 are arranged at the bottom 12 of the outer layer structure, the valve 14 is closed after the vacuum dipping cover is vacuumized by adopting an external vacuumizing device, and the vacuum dipping cover is reserved.
At the end of pouring of the ladle or the tundish, when the liquid level of molten steel is lower than 200-400 mm, a vacuum dipping cover is hung above a ladle nozzle or a tundish nozzle 6 by a small electromagnetic crane, the vacuum dipping cover is lowered into the molten steel at a speed of 5-15 mm/s, the steel sheet 12 at the middle bottom of the outer layer structure 1 is melted by the molten steel 4 in the vacuum dipping cover in the lowering process, the molten steel 4 is pressed into the vacuum dipping cover through the bottom of the vacuum dipping cover under the action of atmospheric pressure, meanwhile, the steel sheet at the contact part with the molten steel in the outer layer structure 1 is melted by the molten steel, and after the vacuum dipping cover is lowered to the bottom of the ladle or the tundish, the serrated circular ring 22 in the inner layer structure 2 plays a role of supporting the vacuum dipping cover, and meanwhile, the molten steel flows into the vacuum dipping cover from gaps among the serrations. When the vacuum dipping cover is applied to pouring of the steel ladle, and when the liquid level in the steel ladle is lower than the height of the saw teeth, the pouring of the molten steel in the heat is stopped; when the vacuum dipping cover is applied to pouring of the tundish, the pouring of the tundish is stopped when the liquid level in the tundish is lower than 30-50 mm.
Under the action of atmospheric pressure, molten steel is pressed into the vacuum dipping cover, and the vacuum dipping cover is positioned right above the water gap, so that the liquid level of the molten steel above the water gap is still kept at the height of the vacuum dipping cover at the end of pouring, namely 400-700 mm, the phenomenon of vortex slag rolling basically cannot occur under the high liquid level, and even if slag flows into the vacuum dipping cover, the slag 5 flowing into the bottom of the vacuum dipping cover also floats upwards and floats to the top of the dipping cover.
The vacuum dipping cover can drain slag above the water gap, not only can play a slag blocking effect, but also can not obviously block the flow of molten steel, and is favorable for stable and efficient operation of continuous casting.
Example 1,
Processing a vacuum dipping cover shown in figures 1, 2 and 3, placing a truncated cone-shaped vacuum dipping cover right above a ladle nozzle at the end of pouring of a ladle, wherein the vacuum dipping cover is 400 in height, 600mm in bottom diameter and 500mm in top diameter, the structure of the truncated cone-shaped vacuum dipping cover is divided into an inner layer and an outer layer, an inner layer 2 of the vacuum dipping cover is a hollow truncated cone-shaped refractory material with an opening at the bottom and a sealed top, the hollow truncated cone-shaped refractory material is made of corundum, the bottom of the hollow truncated cone-shaped refractory material is a saw-tooth-shaped circular ring 22, the height of saw teeth is 10mm, the outer layer of the vacuum dipping cover is a hollow truncated cone-shaped device with both the sealed bottom and the sealed top, the hollow truncated cone-shaped refractory material is made of a thin steel plate, a vacuumizing pipeline 13 and a valve 14 are arranged at the bottom 12 of an outer layer structure, and the valve 14 is closed after the vacuum dipping cover is vacuumized by adopting an external vacuumizing device, and the vacuum dipping cover is reserved.
At the end of pouring of the ladle, when the liquid level of molten steel is lower than 200mm, a vacuum dipping cover is hung above a ladle nozzle or a tundish nozzle 6 by a small electromagnetic crane, the vacuum dipping cover is lowered into the molten steel at a speed of 5mm/s, the steel sheet 12 at the bottom of the outer layer structure 1 is melted by the molten steel 4 in the process of lowering the vacuum dipping cover, the molten steel 4 is pressed into the vacuum dipping cover through the bottom of the vacuum dipping cover under the action of atmospheric pressure, meanwhile, the steel sheet at the part contacted with the molten steel in the outer layer structure 1 is melted by the molten steel, and after the vacuum dipping cover is lowered to the bottom of the ladle, the serrated circular ring 22 at the bottom of the hollow truncated cone-shaped refractory material plays a role of supporting the vacuum dipping cover, and meanwhile, the molten steel flows into the vacuum dipping cover from gaps among the serrations. And when the liquid level in the ladle is lower than the height of the saw teeth, stopping pouring the molten steel in the heat.
Under the action of atmospheric pressure, molten steel is pressed into the vacuum dipping cover, and the vacuum dipping cover is positioned right above the water gap, so that the liquid level of the molten steel above the water gap is still kept at the height of the vacuum dipping cover at the end of pouring, namely 400mm, the phenomenon of vortex slag rolling basically cannot occur under the high liquid level, and even if slag flows into the vacuum dipping cover, the phenomenon of floating up can occur to slag 5 flowing from the bottom of the vacuum dipping cover, and the slag floats up to the top of the dipping cover.
By using the vacuum dipping cover, the problem of vortex slag rolling is solved, low liquid level pouring of molten steel can be realized, the casting allowance of a ladle of molten steel can be reduced by more than 60%, the steel yield is increased, and resources are saved.
EXAMPLE 2,
Processing a vacuum dipping cover shown in figures 1, 2 and 3, placing a truncated cone-shaped vacuum dipping cover right above a pouring opening of a pouring box at the pouring end of the pouring box, wherein the vacuum dipping cover is 700mm in height, 200mm in bottom diameter and 150mm in top diameter, the truncated cone-shaped vacuum dipping cover is of an inner layer and an outer layer, an inner layer 2 of the vacuum dipping cover is made of hollow truncated cone-shaped refractory materials with an opening at the bottom and a sealed top, the hollow truncated cone-shaped refractory materials are corundum, the bottoms of the hollow truncated cone-shaped refractory materials are saw-tooth-shaped circular rings 22, the heights of saw teeth are 20mm, the outer layer of the vacuum dipping cover is made of hollow truncated cone-shaped devices with the sealed bottom and the top, the hollow truncated cone-shaped devices are made of thin steel plates, a vacuumizing pipeline 13 and a valve 14 are arranged at the bottom 12 of an outer layer structure, the valve 14 is closed after the vacuum dipping cover is vacuumized by adopting an external vacuumizing device, and the vacuum dipping cover is ready for use.
At the end of pouring of the tundish, when the liquid level of molten steel is lower than 400mm, a vacuum dipping cover is hung above a ladle nozzle or a tundish nozzle 6 by a small electromagnetic crane, the vacuum dipping cover is lowered into the molten steel at a speed of 15mm/s, the steel sheet 12 at the bottom of the outer layer structure is melted by the molten steel 4 in the process of lowering the vacuum dipping cover, the molten steel 4 is pressed into the vacuum dipping cover through the bottom of the vacuum dipping cover under the action of atmospheric pressure, meanwhile, the steel sheet at the part contacted with the molten steel in the outer layer structure 1 is melted by the molten steel, and after the vacuum dipping cover is lowered to the bottom of the tundish, the serrated circular ring 22 at the bottom of the hollow truncated cone-shaped refractory material plays a role of supporting the vacuum dipping cover, and meanwhile, the molten steel flows into the vacuum dipping cover from gaps among the serrations. And when the liquid level in the tundish is lower than 30mm, stopping pouring by the tundish.
Under the action of atmospheric pressure, molten steel is pressed into the vacuum dipping cover, and the vacuum dipping cover is positioned right above the water gap, so that the liquid level of the molten steel above the water gap is still kept at the height of the vacuum dipping cover at the end of pouring, namely 700mm, the phenomenon of vortex slag rolling basically cannot occur under the high liquid level, and even if slag flows into the vacuum dipping cover, the phenomenon of floating up can occur to slag 5 flowing from the bottom of the vacuum dipping cover, and the slag floats up to the top of the dipping cover.
By using the vacuum dipping cover, the problem of vortex slag rolling is solved, low liquid level pouring of molten steel can be realized, the casting allowance of the molten steel in the tundish can be reduced by more than 70%, the steel yield is increased, and resources are saved.
Claims (5)
1. A method for reducing molten steel casting allowance in continuous casting process is characterized in that a truncated cone-shaped vacuum dipping cover is placed in molten steel right above a ladle nozzle or a tundish nozzle at the end of casting of a ladle or a tundish, and the height of the vacuum dipping cover is 400-700 mm; before the vacuum dipping cover is placed into molten steel, the interior of the vacuum dipping cover is in a vacuum state, after the vacuum dipping cover is placed into the molten steel, the bottom of the vacuum dipping cover is melted away by the molten steel, the molten steel is pressed into the vacuum dipping cover under the influence of atmospheric pressure, and the liquid level of the molten steel in the vacuum dipping cover is increased; the vacuum dipping cover is arranged above the water gap, so that the molten steel liquid level with the height of 400-700 mm is still arranged above the water gap at the end of pouring of the ladle or the tundish, the local high-liquid-level pouring is realized, and the vortex slag rolling phenomenon still cannot occur at the end of pouring;
the truncated cone-shaped vacuum impregnation cover has an inner layer and an outer layer; the inner layer structure of the vacuum impregnation cover is a hollow truncated cone-shaped refractory material with an opening at the bottom and a sealing top, the material is corundum, the bottom of the hollow truncated cone-shaped refractory material is a sawtooth-shaped circular ring, and the height of the sawtooth is 10-20 mm; the outer layer structure of the vacuum impregnation cover is a hollow truncated cone-shaped device with sealed bottom and top, the material is a thin steel plate, and the bottom of the outer layer structure is provided with a vacuumizing pipeline and a valve.
2. The method for reducing the casting margin of molten steel in a continuous casting process according to claim 1, wherein the diameter of the circular shape of the top cross section of the vacuum impregnation hood is 150-500 mm; the diameter of the circular cross section of the bottom of the vacuum dipping cover is 200-600 mm.
3. The method for reducing a casting margin of molten steel in a continuous casting process according to claim 1, wherein a truncated cone-shaped vacuum submerged arc is placed right above a ladle nozzle or a tundish nozzle at the end of casting of a ladle or a tundish at a molten steel level lower than 400 mm.
4. A method for reducing the casting margin of molten steel in a continuous casting process according to claim 3, characterized in that at the end of casting of the ladle or tundish, the vacuum impregnation hood is lifted by a small electromagnetic crane above the ladle nozzle or tundish nozzle and lowered into the molten steel at a speed of 5-15 mm/s at a molten steel level below 400 mm.
5. The method for reducing a casting margin of molten steel in a continuous casting process according to any one of claims 1 to 4, wherein the pouring is stopped when the level of the liquid in the tundish is less than 50mm when the vacuum dipping cover is applied to the pouring of the tundish.
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| CN201810038562.3A CN107983944B (en) | 2018-01-13 | 2018-01-13 | Method and device for reducing molten steel casting allowance in continuous casting process |
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| CN201810038562.3A CN107983944B (en) | 2018-01-13 | 2018-01-13 | Method and device for reducing molten steel casting allowance in continuous casting process |
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| JPS6241462U (en) * | 1985-08-24 | 1987-03-12 | ||
| JPS6340668A (en) * | 1986-08-06 | 1988-02-22 | Nippon Kokan Kk <Nkk> | Vessel for molten metal having molten metal outflow port |
| JPH0715143U (en) * | 1993-07-29 | 1995-03-14 | 合同製鐵株式会社 | Tundish slag outflow prevention device |
| JP4419934B2 (en) * | 2005-09-07 | 2010-02-24 | 住友金属工業株式会社 | Method for continuous casting of molten metal |
| JP4670762B2 (en) * | 2006-07-27 | 2011-04-13 | 住友金属工業株式会社 | Method for continuous casting of molten metal |
| CN202411367U (en) * | 2011-12-20 | 2012-09-05 | 鞍钢股份有限公司 | Slag-rolling-proof cap of steel casting opening of tundish |
| CN102728827B (en) * | 2012-07-23 | 2014-11-05 | 武汉钢铁(集团)公司 | Continuous casting tundish capable of improving molten steel cleanliness |
| CN102825229A (en) * | 2012-08-24 | 2012-12-19 | 中冶南方工程技术有限公司 | Flow control structure for preventing vortexes from being generated in tundish |
| CN105710357A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Tundish flow control device and method |
| CN207787694U (en) * | 2018-01-13 | 2018-08-31 | 山东钢铁股份有限公司 | The device of molten steel casting surplus is reduced in a kind of casting process |
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