CN110756753A - Double-roller ultrathin strip continuous casting pouring water distribution flow port - Google Patents
Double-roller ultrathin strip continuous casting pouring water distribution flow port Download PDFInfo
- Publication number
- CN110756753A CN110756753A CN201910960090.1A CN201910960090A CN110756753A CN 110756753 A CN110756753 A CN 110756753A CN 201910960090 A CN201910960090 A CN 201910960090A CN 110756753 A CN110756753 A CN 110756753A
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- Prior art keywords
- flow
- steel
- molten steel
- groove
- thin strip
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- 238000009826 distribution Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000009749 continuous casting Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 79
- 239000010959 steel Substances 0.000 claims abstract description 79
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 24
- 238000010079 rubber tapping Methods 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims description 15
- 239000002184 metal Substances 0.000 description 8
- 238000007689 inspection Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- 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
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- 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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Abstract
The invention relates to a double-roller ultrathin strip continuous casting pouring water distribution flow hole which comprises a side wall and an end face, wherein the side wall and the end face define 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, at the bottom of the outer side of the side wall, which is flush with the steel outlet holes, 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.
Description
Technical Field
The invention relates to the field of functional fire-resistant materials for continuous casting, in particular to a double-roller ultrathin strip continuous casting water distribution nozzle.
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.
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.
Disclosure of Invention
The invention aims to provide a double-roller ultrathin strip continuous casting distribution water gap, which can reduce the phenomenon that the temperature distribution of molten steel in a weld puddle forms striped distribution, thereby reducing the striped fluctuation of the thickness of a metal thin strip.
In order to solve the technical problem, the double-roller ultra-thin strip continuous casting pouring water distribution flow hole comprises a side wall and an end face, wherein a cavity is defined by the side wall and the end face, a plurality of steel outlet holes are formed in the bottom of the side wall, a flow stabilizing groove is formed in the position, at the bottom of the outer side of the side wall, which is flush with the steel outlet holes, 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 width ratio of the inner cavity part to the adduction section is 1.5-2.5: 1.
The ratio of the total sectional area of the plurality of steel outlet holes, the sectional area of the inner cavity portion 81 and the sectional area of the opening section 82 may preferably be 1:4: 2.
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 water distribution flow port of the invention 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.
Detailed Description
The dual-roller ultra-thin strip casting water distribution flow port is used on a casting system for dual-roller thin strip casting, as shown in fig. 1, the casting system for dual-roller thin strip casting comprises a water distribution flow port 1, a weld puddle 2 and a casting roller 3, the water distribution flow port 1 comprises two side walls 4 and two end surfaces 5, a cavity 6 is enclosed by the side walls 4 and the end surfaces 5, a plurality of steel outlet holes 7 are arranged at the bottom of the side walls 4, and molten steel flows into the weld puddle 2 from the water distribution flow port 1 through the steel outlet holes 7.
As shown in fig. 5 and 6, the flow stabilizing groove 8 is formed in the position, on the outer side of the bottom of the side wall 4, of the double-roller ultra-thin strip continuous casting pouring water distribution nozzle of the present invention, which 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 position, on the outer bottom of the side wall 4, of which the height is consistent with that of 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 (6)
1. The utility model provides a two roller ultra-thin strip continuous casting pouring water distribution water gap, includes lateral wall and terminal surface, lateral wall and terminal surface enclose into and hold the chamber, the lateral wall bottom is equipped with a plurality of steel outlet holes, its characterized in that: and a flow stabilizing groove is formed in the position, at which the bottom of the outer side of the side wall is flush with the steel tapping hole, and is communicated with the steel tapping hole.
2. The twin roll ultra thin strip casting pouring spout according to claim 1, characterized in that: the width of the flow stabilizing groove is larger than the diameter of the steel outlet hole.
3. The twin roll ultra thin strip casting pouring spout according to claim 1, characterized in that: 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.
4. The twin roll ultra thin strip casting pouring spout according to claim 3, characterized in that: the width ratio of the inner cavity part to the opening section is 2-2.5: 1.
5. The twin roll ultra thin strip casting pouring spout according to claim 3, characterized in that: the ratio of the sectional area of the plurality of steel outlet holes, the sectional area of the inner cavity portion 81 and the sectional area of the opening section 82 may preferably be 1:4: 2.
6. The twin roll ultra thin strip casting pouring spout according to any one of claims 1 to 5, characterized in that: 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910960090.1A CN110756753A (en) | 2019-10-10 | 2019-10-10 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910960090.1A CN110756753A (en) | 2019-10-10 | 2019-10-10 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
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| Publication Number | Publication Date |
|---|---|
| CN110756753A true CN110756753A (en) | 2020-02-07 |
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| CN201910960090.1A Pending CN110756753A (en) | 2019-10-10 | 2019-10-10 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111590038A (en) * | 2020-06-08 | 2020-08-28 | 一重集团大连工程技术有限公司 | Thin-strip continuous casting flow distributor for inhibiting liquid level fluctuation |
| CN112157231A (en) * | 2020-09-16 | 2021-01-01 | 东北大学 | Thin strip continuous casting water distribution outlet device |
| CN115383102A (en) * | 2022-09-16 | 2022-11-25 | 青岛正望新材料股份有限公司 | Transition bag for thin strip continuous casting |
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| JPH08155593A (en) * | 1994-12-06 | 1996-06-18 | Nippon Steel Corp | Method for continuously casting thin cast slab and immersion nozzle for continuous casting |
| JPH08164454A (en) * | 1994-12-14 | 1996-06-25 | Nippon Steel Corp | Pouring nozzle for continuous casting apparatus for wide and thin cast slab |
| JPH08164450A (en) * | 1994-12-14 | 1996-06-25 | Nippon Steel Corp | Nozzle for continuously casting wide and thin cast slab |
| KR20060074634A (en) * | 2004-12-28 | 2006-07-03 | 주식회사 포스코 | A stabilized supply of molten steel in twin roll strip casting process |
| CN107716884A (en) * | 2017-11-14 | 2018-02-23 | 华耐国际（宜兴）高级陶瓷有限公司 | A kind of new thin strap continuous casting cloth flowing water mouth |
| CN207521665U (en) * | 2017-11-03 | 2018-06-22 | 阎素华 | A kind of non-crystal belt making nozzle |
| CN209318741U (en) * | 2018-12-11 | 2019-08-30 | 浙江兆晶电气科技有限公司 | A kind of Fe-based amorphous wide-band system nozzle structure |
| CN211803726U (en) * | 2019-10-10 | 2020-10-30 | 青岛正望钢水控制股份有限公司 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
-
2019
- 2019-10-10 CN CN201910960090.1A patent/CN110756753A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08155593A (en) * | 1994-12-06 | 1996-06-18 | Nippon Steel Corp | Method for continuously casting thin cast slab and immersion nozzle for continuous casting |
| JPH08164454A (en) * | 1994-12-14 | 1996-06-25 | Nippon Steel Corp | Pouring nozzle for continuous casting apparatus for wide and thin cast slab |
| JPH08164450A (en) * | 1994-12-14 | 1996-06-25 | Nippon Steel Corp | Nozzle for continuously casting wide and thin cast slab |
| KR20060074634A (en) * | 2004-12-28 | 2006-07-03 | 주식회사 포스코 | A stabilized supply of molten steel in twin roll strip casting process |
| CN207521665U (en) * | 2017-11-03 | 2018-06-22 | 阎素华 | A kind of non-crystal belt making nozzle |
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| CN211803726U (en) * | 2019-10-10 | 2020-10-30 | 青岛正望钢水控制股份有限公司 | Double-roller ultrathin strip continuous casting pouring water distribution flow port |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111590038A (en) * | 2020-06-08 | 2020-08-28 | 一重集团大连工程技术有限公司 | Thin-strip continuous casting flow distributor for inhibiting liquid level fluctuation |
| CN111590038B (en) * | 2020-06-08 | 2022-05-20 | 一重集团大连工程技术有限公司 | Thin-strip continuous casting flow distributor capable of inhibiting liquid level fluctuation |
| CN112157231A (en) * | 2020-09-16 | 2021-01-01 | 东北大学 | Thin strip continuous casting water distribution outlet device |
| CN112157231B (en) * | 2020-09-16 | 2021-10-19 | 东北大学 | Thin strip continuous casting water distribution outlet device |
| CN115383102A (en) * | 2022-09-16 | 2022-11-25 | 青岛正望新材料股份有限公司 | Transition bag for thin strip continuous casting |
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Application publication date: 20200207 |