CN210755016U - Double-roller ultrathin strip casting system - Google Patents
Double-roller ultrathin strip casting system Download PDFInfo
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- CN210755016U CN210755016U CN201921688916.5U CN201921688916U CN210755016U CN 210755016 U CN210755016 U CN 210755016U CN 201921688916 U CN201921688916 U CN 201921688916U CN 210755016 U CN210755016 U CN 210755016U
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Abstract
The utility model relates to an ultra-thin casting system of taking of two rollers, including distributing water mouthful and casting roll, form the weld pool between the casting roll, weld pool top sets up gas conduit and shower nozzle. In the process of pouring molten steel, a CO atmosphere is formed on the liquid level of the molten steel by the CO spray heads distributed on the liquid level of the molten steel around the molten steel distributor, and the combustion of the liquid level of the molten steel is performed by controlling the flow rate of CO airflow in sections to play a role in thermal compensation of the molten steel and refractory materials.
Description
Technical Field
The utility model relates to a function refractory material field is used in the continuous casting, especially relates to a two roller ultra-thin area casting systems.
Background
The twin-roll thin strip continuous casting technology is a leading-edge technology in the modern metallurgical industry, high-temperature molten metal can be directly cast and rolled into a thin strip steel plate, the cast and rolled thickness can reach the range of 0.1mm-10mm, the production flow of hot strip steel is greatly shortened, and the technology is the shortest hot strip steel production technology at present. The thin strip continuous casting process is a sub-rapid solidification process of metal, and can become an important solution for solving the most troublesome problems of plasticity, segregation, inclusion, uniformity, energy consumption and the like in the processing of high alloy materials.
The twin-roll strip casting process is different from and related to the conventional continuous casting process, and the process is that the molten metal in a tundish is distributed into a crystallization container consisting of a crystallizer and a side sealing plate through a submerged distribution water port to form a weld puddle, as shown in fig. 1, the molten metal with high temperature is gradually solidified on the surface of a rotating crystallization roll, and the molten metal is extruded to form the metal strip. The quality of the thin strip product is directly related to the state of a flow field in the weld pool, the distribution of a temperature field, the fluctuation of a liquid level and the purity of molten steel.
The lower temperature at both ends in the weld puddle and the faster cooling of the molten steel tend to cause the thickness of both edges of the strip to be slightly less than the thickness of the middle of the strip as shown in figures 4, 7 and 10. Such a situation may affect the product quality of the steel strip.
For example, the water distribution devices disclosed in application numbers 201711121376.8 and 20181004656548 are all that side nozzles are horizontally and uniformly arranged in a single row or multiple rows at intervals, as shown in fig. 2 and 3, molten steel is divided into multiple strands to flow out from the nozzles arranged at intervals, and then the molten steel is mixed after flowing out. When molten steel flowing out of the tap hole is mixed, the molten steel at a position aligned with the tap hole flows fast, the temperature of the molten steel is high, the molten steel at a position not aligned with the tap hole flows slow, the molten steel is easy to cool, and the temperature is low. This causes the temperature distribution of the molten steel in the puddle to form a striped distribution, and the thickness of the metal strip formed after cooling by the crystallization rolls also fluctuates in a striped manner. FIG. 4 is a graph showing the results of thickness inspection of an ultra thin strip produced at the nozzle, in which a thin strip steel plate has a standard thickness of 0.8mm and a width of 100cm and 10 tap holes are uniformly spaced. As can be seen from the figure, the steel strip is thicker at the position near the tap-holes, while the position between the adjacent tap-holes shows striations of smaller thickness, with a height of about 0.002cm and a difference of about 2% -2.5%. In an environment where the requirement for uniformity of the thickness of the steel strip is high, such a difference in thickness has an influence on the product quality.
The current distributor that application number is 201610930886.9 announced drives molten steel inclusion come-up through inert gas, but whole homogeneity is not enough, still partly molten steel inclusion along with through-hole torrent get into in the weld puddle.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem of providing a double-roller ultrathin strip casting system, which can reduce the condition of low molten steel temperature at the two ends of a weld pool and reduce the condition of smaller thickness of the two edges of a steel strip; the phenomenon that the temperature distribution in the weld puddle forms stripe-shaped distribution is reduced, and therefore stripe-shaped fluctuation of the thickness of the metal thin strip is reduced.
For solving the technical problem, the utility model discloses an ultra-thin area casting system of two rollers, including distributing water mouthful and casting roll, form the weld pool between the casting roll, weld pool top sets up gas pipeline and shower nozzle.
The water distribution flow port is provided with a support table, the spray heads are arranged below the support table, the arrangement interval of the CO spray heads is 20-100mm, and the flow of CO gas can be independently adjusted.
Carry out thermal compensation to the molten steel liquid level through segmentation control CO airflow flow size, calculate the best flow of shower nozzle, perhaps only set up the shower nozzle at the both ends of weld pool for the weld pool both ends obtain sufficient thermal compensation, the temperature at weld pool both ends is not less than weld pool middle part, makes the thickness and the middle part difference of steel band both sides reduce.
The distributing water hole comprises a side wall and a end face, the side wall and the end face are enclosed to form a containing cavity, a plurality of steel outlet holes are formed in the bottom of the side wall, a flow stabilizing groove is formed in the position, flush with the steel outlet holes, of the bottom of the outer side of the side wall, and the flow stabilizing groove is communicated with the steel outlet holes. After the steady flow groove is arranged, the molten steel flowing out of each separated steel outlet hole can not directly flow into the weld puddle, but transversely flow in the steady flow groove firstly, and then flow into the weld puddle after being mixed. Because the temperature of the molten steel in the steady flow groove is reduced slowly and has little difference with the temperature of the molten steel in the steel tapping hole, the temperature difference is almost not existed after the molten steel is mixed in the steady flow groove, the molten steel flowing into the weld puddle is not stranded any more, and the non-uniform degree of the molten steel distribution is reduced.
The width of the flow stabilizing groove is larger than the diameter of the steel outlet hole. After the molten steel flows out of the steel tapping hole and enters the steady flow groove, the width of the steady flow groove is increased, the flow speed of the molten steel is slowed down, and a flow field of the molten steel in the steady flow groove can generate vortex, so that the molten steel can be fully mixed in the steady flow groove.
The flow stabilizing groove comprises an inner cavity part on the inner side and an opening section arranged on the outer side. The width of the opening section is smaller than the width of the inner cavity part. The outlet on the outer side of the flow stabilizing groove is narrowed, molten steel can be more fused in the inner cavity part, the flow speed of the opening section is increased, and the flow speed can be adjusted.
The cavity is divided into an upper outer cavity and a lower flow stabilizing cavity, and a filter screen is arranged between the outer cavity and the flow stabilizing cavity.
The utility model discloses still relate to a two roller ultra-thin take weld pool molten steel heat compensation method, at the in-process of molten steel pouring, through the CO shower nozzle that distributes on the molten steel liquid level around molten steel water distributor, form CO atmosphere at weld pool liquid level, through segment control CO air current flow size, CO plays the effect that prevents molten steel surface oxidation and compensate to molten steel and refractory material heat at the burning of molten steel liquid level.
The utility model discloses a two roller ultra-thin area casting systems set up gas pipeline and shower nozzle above the weld pool, carry out thermal compensation to the molten steel liquid level through segment control CO airflow flow size, calculate the best flow of the shower nozzle at both ends, perhaps only set up the shower nozzle at the both ends of weld pool for the weld pool both ends obtain sufficient thermal compensation, and the temperature at weld pool both ends is not less than the weld pool middle part, makes the thickness and the middle part difference of steel band both sides reduce. The water distribution flow port initially forms a relatively stable flow field in the flow stabilizing cavity, and then enters the flow stabilizing groove through the through hole to decelerate and uniformly distribute the molten steel again.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of a structure of a casting system for twin roll strip casting.
Fig. 2 is a front view of a prior art water distribution spout.
Fig. 3 is a side view of a prior art water distribution spout.
Fig. 4 is a graph of the thickness inspection result of the ultra-thin strip produced by the distribution flow gate in the prior art.
Fig. 5 is a front view of the water distribution flow port in embodiment 1.
Fig. 6 is a side view of a water distribution flow port in embodiment 1.
Fig. 7 is a graph of the thickness inspection results of the ultra-thin ribbon produced by the distribution nozzle in example 1.
Fig. 8 is a front view of a water distribution flow port in embodiment 2.
Fig. 9 is a side view of a water distribution flow port in embodiment 2.
Fig. 10 is a graph of the thickness inspection results of the ultra-thin ribbon produced by the distribution flow gate in example 2.
Fig. 11 is a partially enlarged view of the stabilizer groove.
Fig. 12 is a graph of the thickness inspection results of the ultra-thin ribbon produced by the distribution nozzle in example 3.
Fig. 13 is a graph of the thickness inspection results of the ultra-thin ribbon produced by the distribution nozzle in example 4.
Detailed Description
As shown in fig. 1, the casting system for twin roll strip casting includes a water distribution port 1, a weld pool 2, and a casting roll 3, the water distribution port 1 includes two side walls 4 and two end surfaces 5, the side walls 4 and the end surfaces 5 enclose a cavity 6, a plurality of steel outlet holes 7 are provided at the bottom of the side walls 4, and molten steel flows into the weld pool 2 from the water distribution port 1 through the steel outlet holes 7.
As shown in fig. 1, a gas pipe and a shower head 30 are provided above the weld puddle 2, a support 31 is provided at the water distribution port 1, and the shower head 30 is provided below the support 31. The spray heads 30 are uniformly arranged below the support table 31, the arrangement interval of the CO spray heads 30 is 20-100mm, and the flow of CO gas can be independently adjusted. The nozzles 30 may be provided at both ends of the support base 31.
Carry out thermal compensation to the molten steel liquid level through segmentation control CO airflow flow size, calculate the best flow of the shower nozzle at both ends, perhaps only set up the shower nozzle at the both ends of weld pool for the weld pool both ends obtain sufficient thermal compensation, and the temperature at weld pool both ends is not less than weld pool middle part, makes the thickness and the middle part difference of steel band both sides reduce.
As shown in fig. 5 and 6, a flow stabilizing groove 8 is formed in the outer side of the bottom of the side wall 4 of the water distribution flow port and is flush with the steel tapping hole 7, and the flow stabilizing groove 8 is communicated with the steel tapping hole 7, that is, the flow stabilizing groove 8 is a strip-shaped groove formed in the outer bottom of the side wall 4 and is in the same height as the steel tapping hole 7, and the groove is parallel to the bottom of the side wall 4. The joint of the steady flow groove 8 and the tapping hole 7 can be provided with a round chamfer.
As shown in fig. 5, the receiving chamber 6 is divided into an upper outer chamber 61 and a lower flow stabilizing chamber 62, and a filter screen 10 is disposed between the outer chamber 61 and the flow stabilizing chamber 62.
In embodiment 1, as shown in fig. 5 and 6, the shape of the flow stabilizer groove 8 is a long-strip-shaped groove having a uniform width in the vertical direction. The molten steel flowing out of each separated steel outlet hole 7 does not directly flow into the weld pool 2, but a part of the molten steel flows transversely in the stabilizing trough 8, is mixed and then flows into the weld pool 2. Because the temperature of the molten steel in the steady flow groove 8 is reduced slowly and has almost no temperature difference with the temperature of the molten steel in the steel outlet hole 7, the molten steel is mixed in the steady flow groove 8, the temperature difference hardly exists, the molten steel flowing into the weld puddle 2 is not stranded, and the uneven degree of the molten steel distribution is reduced. FIG. 7 is a graph showing the results of thickness inspection of an ultra thin strip produced at a nozzle according to example 1, in which a thin strip steel plate has a standard thickness of 0.8mm and a width of 100cm and 10 tap holes are uniformly spaced. As can be seen from FIG. 7, the thickness of the ultra-thin strip is smaller than the thickness fluctuation shown in FIG. 4, and the position between the adjacent tap holes has stripes with smaller thickness, the height of the stripes is about 0.0006cm, the difference is about 0.5-0.75%, and the product quality is better.
The width of the steady flow groove 8 can be set to be larger than the diameter of the steel outlet hole 7.
In embodiment 2, as shown in fig. 8 and 9, the flow stabilization tank 8 includes an inner cavity portion 81 on the inner side and an opening section 82 provided on the outer side. The width of the open section 82 is less than the width of the inner cavity portion. The width of the open section 82 is smaller than the width of the inner cavity portion 81.
Although the strip-shaped distribution of the temperature change in the weld puddle 2 can be reduced after the flow stabilizing groove 8 is arranged, the flow stabilizing groove 8 can reduce the outflow speed of molten steel, so that the temperature gradient is generated on the upper surface of the molten steel in the weld puddle in the direction parallel to the water distribution port 1 and the casting rolls 3, and the uniformity of the steel strip is also influenced. The outlet on the outer side of the steady flow groove 8 is narrowed, on one hand, the molten steel can be more fused in the inner cavity part 81; on the other hand, the flow rate of the molten steel can be adjusted to be larger by the opening section 82, more stirring is generated in the weld puddle 2 after the molten steel flows out of the water gap, the distribution in the weld puddle is more uniform, and the temperature difference is small.
FIG. 10 is a graph showing the results of thickness inspection of an ultra thin strip produced at a nozzle according to example 2, in which a thin strip steel plate has a standard thickness of 0.8mm and a width of 100cm and 10 tap holes are uniformly spaced. As can be seen from fig. 10, the thickness of the ultra-thin band was smaller than the thickness fluctuation shown in fig. 4 and 7, and the positions between the adjacent tap holes showed small-thickness streaks having a height of about 0.0001cm and a difference of about 0.05-0.1%.
Through experiments, the width ratio of the inner cavity portion b and the opening section c can be suitably optimized. As shown in FIG. 11, the ratio of the width of the inner cavity portion b to the width of the opening section c is 1.5-2.5:1, and the ratio of the cross-sectional area of the inner cavity portion to the cross-sectional area of the opening section is also 1.5-2.5: 1. Most preferably 2:1, and in the third embodiment, the width ratio of the inner cavity part b to the opening section c is 2:1, and as can be seen from fig. 12, the thickness fluctuation of the ultra-thin strip is smaller, stripes with smaller thickness appear at the positions between the adjacent steel-tapping holes, the height of the stripes is about 0.0001cm, and the difference is about 0.05-0.07%.
The ratio of the total cross-sectional area of the plurality of steel outlet holes 7, the cross-sectional area of the inner cavity portion 81 and the cross-sectional area of the opening section 82 can be optimized, and is preferably 1:4: 2.
Claims (5)
1. A twin roll ultra thin strip casting system, characterized by: the device comprises a water distribution flow port and a casting roller, a weld pool is formed between the casting rollers, and a gas pipeline and a spray head are arranged above the weld pool.
2. The twin roll ultra thin strip casting system as claimed in claim 1, wherein: the water distribution flow port is provided with a support table, the spray heads are arranged below the support table, the arrangement interval of the CO spray heads is 20-100mm, and the flow of CO gas can be independently adjusted.
3. A twin roll ultra thin strip casting system as claimed in claim 1 or claim 2 wherein: the water distribution flow port comprises a side wall and a end face, the side wall and the end face are enclosed to form a cavity, a plurality of steel outlet holes are formed in the bottom of the side wall, a flow stabilizing groove is formed in the position, flush with the steel outlet holes, of the bottom of the outer side of the side wall, the flow stabilizing groove is communicated with the steel outlet holes, and the width of the flow stabilizing groove is larger than the diameter of the steel outlet holes.
4. A twin roll ultra thin strip casting system as claimed in claim 3 wherein: the flow stabilizing groove comprises an inner cavity part on the inner side and an opening part arranged on the outer side, and the width of the inner cavity part is larger than that of the opening part.
5. A twin roll ultra thin strip casting system as claimed in claim 3 wherein: the cavity is divided into an upper outer cavity and a lower flow stabilizing cavity, and a filter screen is arranged between the outer cavity and the flow stabilizing cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921688916.5U CN210755016U (en) | 2019-10-10 | 2019-10-10 | Double-roller ultrathin strip casting system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921688916.5U CN210755016U (en) | 2019-10-10 | 2019-10-10 | Double-roller ultrathin strip casting system |
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| CN210755016U true CN210755016U (en) | 2020-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110860663A (en) * | 2019-10-10 | 2020-03-06 | 青岛正望钢水控制股份有限公司 | Double-roller ultrathin strip casting system and molten steel heat compensation method for weld puddle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110860663A (en) * | 2019-10-10 | 2020-03-06 | 青岛正望钢水控制股份有限公司 | Double-roller ultrathin strip casting system and molten steel heat compensation method for weld puddle |
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Address after: 266200 No. 1, Zhengwang Road, Jimo environmental protection industrial park, Qingdao, Shandong Patentee after: Qingdao Zhengwang Material Co.,Ltd. Address before: 266200 No. 1, Zhengwang Road, Jimo environmental protection industrial park, Qingdao, Shandong Patentee before: QINGDAO HIWORLD MOLTEN STEEL CONTROL CO.,LTD. |