CN115213387A - Continuous casting tundish and preparation method thereof - Google Patents
Continuous casting tundish and preparation method thereof Download PDFInfo
- Publication number
- CN115213387A CN115213387A CN202110404280.2A CN202110404280A CN115213387A CN 115213387 A CN115213387 A CN 115213387A CN 202110404280 A CN202110404280 A CN 202110404280A CN 115213387 A CN115213387 A CN 115213387A
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- Prior art keywords
- tundish
- continuous casting
- gas
- retaining wall
- layer
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- Pending
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000010410 layer Substances 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 239000011241 protective layer Substances 0.000 claims abstract description 21
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 239000011449 brick Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 50
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 46
- 229910052786 argon Inorganic materials 0.000 description 23
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 239000007788 liquid Substances 0.000 description 7
- 238000007664 blowing Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000024121 nodulation Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007306 turnover Effects 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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
-
- 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
- B22D11/117—Refining the metal by treating with gases
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a continuous casting tundish and a preparation method thereof, and the continuous casting tundish comprises a tundish body, an air curtain retaining wall arranged at the bottom in the tundish body, a tundish working layer arranged on the inner side wall of the tundish body and an air passage arranged between the inner side wall of the tundish body and the tundish working layer; a second protective layer is arranged between the gas circuit and the tundish working layer; the lower end of the gas circuit is communicated with the gas curtain retaining wall, and the upper end of the gas circuit is communicated with an external gas source; and a sealing slope is arranged between the two side surfaces of the air curtain retaining wall and the tundish working layer. The invention promotes the floating of the inclusion/bubble and stabilizes the flow field distribution in the tundish.
Description
Technical Field
The invention relates to a steelmaking process technology, in particular to a continuous casting tundish and a preparation method thereof.
Background
The continuous casting tundish, which is the last container before the molten steel is solidified, is a very important part for improving the product quality. Non-metallic inclusions in molten steel are floated and removed as much as possible in a continuous casting tundish, so that the nodulation condition of a stopper rod head is relieved, the risk that nodulation objects or particles of the nodulation objects enter a crystallizer along with the molten steel and bubbles is reduced, and the defects of a post-process and a final user caused by inclusions in a plate blank are reduced. At present, argon is blown in the tundish to generate an air curtain, so that the effect of a retaining wall is generated, the flowing of molten steel can be effectively improved, the retention time of the molten steel in the tundish is prolonged, dispersed argon bubbles can be used for capturing impurities, and the impurities are promoted to float upwards and be removed in the tundish.
The existing tundish adopts dam, weir and turbulence controller technology, and the flow of molten steel in the tundish is divided into three areas: in the injection area, the molten steel impacts the turbulence controller at a higher speed and flows upwards in a reverse direction after colliding with the turbulence controller; two strong small backflow areas are formed at two sides of the injection flow above the turbulence controller; between the upper retaining wall and the turbulence control device, a large recirculation zone is formed below the liquid surface near the free liquid surface, the recirculation zone having a recirculation direction opposite to the direction of a small recirculation immediately adjacent to the injection flow. Because the reflux zone is close to the liquid level, the speed of the reflux zone close to the liquid level is higher, and the slag entrapment phenomenon is easy to cause.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a continuous casting tundish and a preparation method thereof, which can promote floating of inclusions/bubbles and stabilize flow field distribution in the tundish.
In order to realize the purpose, the invention adopts the following technical scheme:
on one hand, the continuous casting tundish comprises a tundish body, an air curtain retaining wall arranged at the bottom in the tundish body, a tundish working layer arranged on the inner side wall of the tundish body and an air path arranged between the inner side wall of the tundish body and the tundish working layer;
a second protective layer is arranged between the gas circuit and the tundish working layer;
the lower end of the gas circuit is communicated with the gas curtain retaining wall, and the upper end of the gas circuit is communicated with an external gas source;
and a sealing slope is arranged between the two side surfaces of the air curtain retaining wall and the tundish working layer.
Preferably, the air path adopts a copper pipe with the outer diameter of 10 mm.
Preferably, the lower end of the gas circuit is communicated with the gas curtain retaining wall through a connector, and the upper end of the gas circuit is communicated with the external gas source through a connector.
Preferably, a sealing layer is coated on the joint, and the sealing layer is made of magnesium coating materials.
Preferably, the second protective layer is made of a wax stone brick.
Preferably, a wax stone brick is also arranged between the bottom in the tundish body and the air curtain retaining wall.
Preferably, the slope of the sealing slope is between 15 and 20 degrees.
Preferably, the sealing slope is made of magnesium coating.
Preferably, the tundish body comprises a tundish shell and a tundish permanent layer arranged on the inner side wall of the tundish shell;
the gas circuit is arranged between the tundish permanent layer and the second protective layer.
In another aspect, a method of making a continuous casting tundish includes the steps of:
1) Laying an air path from top to bottom along the inner side wall of the tundish body, laying a second protective layer at the bottom of the tundish body, wherein the second protective layer extends towards the inner side wall of the tundish body and covers the surface of the air path;
2) Arranging an air curtain retaining wall on the second protective layer at the bottom of the tundish body;
3) The lower end of the gas path is communicated with the gas inlet end of the gas curtain retaining wall through a joint, and the upper end of the gas path is communicated with an external gas source;
4) Sealing two ends of the air curtain retaining wall, and arranging sealing slopes on two side edges of the air curtain retaining wall;
5) And baking to form the continuous casting tundish.
The continuous casting tundish and the preparation method thereof provided by the invention start from the perspective of full-smooth oxygen control in steel making, improve the purity of molten steel, stabilize the distribution of a flow field in a crystallizer, promote the floating of ultra-low carbon steel inclusion/bubbles, and obviously improve the purity of ultra-low carbon automobile sheet steel.
Drawings
FIG. 1 is a schematic view of the construction of a continuous casting tundish according to the present invention;
fig. 2 isbase:Sub>A schematic sectional view taken along the linebase:Sub>A-base:Sub>A in fig. 1.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, the continuous casting tundish provided by the invention comprises a tundish body, an air curtain retaining wall 1 arranged at the bottom in the tundish body, a tundish working layer 2 arranged on the inner side wall of the tundish body and an air passage 3 arranged between the inner side wall of the tundish body and the tundish working layer 2, wherein the air passage 3 is a copper pipe with the outer diameter of 10 mm.
The tundish body comprises a tundish shell 4 and a tundish permanent layer 5 arranged on the inner side wall of the tundish shell 4.
And second protective layers 6 are arranged between the bottom of the tundish permanent layer 5 and the air curtain retaining wall 1 and between the air path 3 and the tundish working layer 2, and the second protective layers 6 are made of wax stone bricks.
The gas circuit 3 is arranged between the tundish permanent layer 5 and the second protective layer 6.
The lower end of the gas path 3 is communicated with the gas inlet end of the gas curtain retaining wall 1 through a connector, the upper end of the gas path is communicated with an external gas source 8 through a connector 7, and a pressure reducing valve 9 and a flow control instrument 10 are further arranged between the external gas source 8 and the connector 7.
The joint is coated with a sealing layer, and the sealing layer can be made of magnesium coating materials.
A sealing slope 11 is arranged between the two side surfaces of the air curtain retaining wall 1 and the tundish working layer 2, and the slope of the sealing slope 11 is between 15 and 20 degrees.
The sealing ramp 11 is made of a magnesium coating.
The invention also provides a preparation method of the continuous casting tundish, which comprises the following steps:
1) A gas path 3 is laid along the inner side wall of the tundish body from top to bottom, a second protective layer 6 is laid at the bottom of the tundish body, and the second protective layer 6 extends towards the inner side wall of the tundish body and covers the surface of the gas path 3;
2) An air curtain retaining wall 1 is arranged on a second protective layer 6 at the bottom of the tundish body;
3) The lower end of the gas path 3 is communicated with the gas inlet end of the gas curtain retaining wall 1 through a joint, and the upper end is communicated with an external gas source 8;
4) Sealing two ends of the air curtain retaining wall 1 (particularly at joint positions), arranging sealing slopes 11 on two side edges of the air curtain retaining wall 1, wherein the slope of each sealing slope 11 is preferably 15-20 degrees;
5) Baking is carried out, the continuous casting tundish is formed after the baking is finished, the gas path 3 and the second protective layer 6 covered on the surface are buried under the tundish working layer 2, so that the gas path 3 is under the double protection of the second protective layer 6 and the tundish working layer 2, and the melting loss caused by high temperature is avoided.
The preparation method of the continuous casting tundish of the invention also needs to be noted that:
the gas curtain retaining wall 1 is arranged at a position 2400mm away from the center of an inlet, the two side faces of the gas curtain retaining wall are provided with the sealing slopes 11, the corners of the two ends are also sealed, and the bottom of the gas curtain retaining wall is also coated with magnesium coating materials to prevent the gas curtain retaining wall 1 from floating.
The argon gas source of the argon blowing system of the gas curtain retaining wall 1 adopts the sealed argon of the tundish, the argon gas is connected out from the sealed argon main pipe of the tundish, and is blown into the gas chamber of the gas curtain retaining wall 1 after decompression, and the molten steel in the tundish is entered through the gas curtain retaining wall 1. The argon blowing flow is adjustable through a flowmeter, and the argon blowing amount needs to be controlled well so as to prevent the molten steel in the tundish from being exposed due to overlarge gas amount.
And air blowing is also carried out during baking, so that the air path 3 is prevented from being damaged at high temperature.
The gas circuit 3 is fixed at the upper edge opening of the tundish, so that the gas circuit 3 is prevented from loosening during movement or use.
Examples
The continuous casting tundish is applied to a special production station of a steel-making branch refined 2RH +2CC automobile plate line, and the specific implementation steps are as follows:
1) Baking the continuous casting tundish after the steps of the preparation method are completed, wherein before the baking is started, the gas curtain retaining wall 1 must be communicated with argon (in a communicated state, the pressure range of the argon is 0.8-1.2 bar);
2) The argon use parameters were as follows:
| phases | Argon back pressure setting (bar) |
| Tundish baking | 0.8～1.2 |
| Ladle casting-casting machine start | 0.5 |
| Normal casting | 1.0～1.5 |
| The end ladle is completely poured and the end is closed | 0.5 |
3) Argon pressure regulation
Adjusting argon pressure according to the turning state of the liquid level of the tundish, and when the molten steel at the position of a sampling hole of the ladle cover has one of the following phenomena: slightly turning over the slag surface, and keeping the current argon pressure setting when a small amount of steel liquid surface is exposed and small bubbles emerge; when the slag surface is static or turns over greatly, the argon pressure needs to be adjusted;
4) In the argon gas adjusting process, the pressure pointer rotates asynchronously when the pressure knob rotates, if the pointer does not move after the pressure knob rotates, the pointer continues to be adjusted in the same direction in a small amplitude or is adjusted in a small amplitude after stopping, otherwise, the phenomenon of argon gas shut-down or argon gas turn-over caused by the pressure of the argon gas is easily adjusted in a large amplitude, if the phenomenon of argon gas shut-down (the pressure pointer is 0) is found, the original state is maintained until the pouring is finished, the argon gas is not allowed to be opened, and otherwise, potential safety hazards exist;
5) After the steel in each furnace is poured normally, the captain confirms the liquid level of the tundish and strictly prohibits the molten steel from turning over too violently.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. A continuous casting tundish is characterized in that: the air curtain retaining wall is arranged at the bottom in the tundish body, the tundish working layer is arranged on the inner side wall of the tundish body, and the air path is arranged between the inner side wall of the tundish body and the tundish working layer;
a second protective layer is arranged between the gas circuit and the tundish working layer;
the lower end of the gas circuit is communicated with the gas curtain retaining wall, and the upper end of the gas circuit is communicated with an external gas source;
and a sealing slope is arranged between the two side surfaces of the air curtain retaining wall and the tundish working layer.
2. The continuous casting tundish of claim 1, wherein: the gas circuit adopts the copper pipe that the external diameter is 10 mm.
3. The continuous casting tundish according to claim 2, wherein: the lower end of the gas circuit is communicated with the gas curtain retaining wall through a connector, and the upper end of the gas circuit is communicated with the external gas source through a connector.
4. The continuous casting tundish according to claim 3, wherein: the joint is coated with a sealing layer, and the sealing layer is made of magnesium coating materials.
5. The continuous casting tundish of claim 1, wherein: the second protective layer adopts a wax stone brick.
6. The continuous casting tundish according to claim 5, wherein: the internal bottom of tundish with also be equipped with the agalmatolite brick between the air curtain barricade.
7. The continuous casting tundish of claim 1, wherein: the slope of the sealing slope is between 15 and 20 degrees.
8. The continuous casting tundish according to claim 7, wherein: the sealing slope is made of magnesium coating.
9. The continuous casting tundish of claim 1, wherein: the tundish body comprises a tundish shell and a tundish permanent layer arranged on the inner side wall of the tundish shell;
the gas circuit is arranged between the tundish permanent layer and the second protective layer.
10. A preparation method of a continuous casting tundish is characterized by comprising the following steps:
1) Laying an air path from top to bottom along the inner side wall of the tundish body, laying a second protective layer at the bottom of the tundish body, wherein the second protective layer extends towards the inner side wall of the tundish body and covers the surface of the air path;
2) Arranging an air curtain retaining wall on the second protective layer at the bottom of the tundish body;
3) The lower end of the gas path is communicated with the gas inlet end of the gas curtain retaining wall through a joint, and the upper end of the gas path is communicated with an external gas source;
4) Sealing two ends of the air curtain retaining wall, and arranging sealing slopes on two side edges of the air curtain retaining wall;
5) Baking to form the continuous casting tundish according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404280.2A CN115213387A (en) | 2021-04-15 | 2021-04-15 | Continuous casting tundish and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110404280.2A CN115213387A (en) | 2021-04-15 | 2021-04-15 | Continuous casting tundish and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115213387A true CN115213387A (en) | 2022-10-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110404280.2A Pending CN115213387A (en) | 2021-04-15 | 2021-04-15 | Continuous casting tundish and preparation method thereof |
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| Country | Link |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006035272A (en) * | 2004-07-27 | 2006-02-09 | Jfe Steel Kk | Method for removing inclusion in tundish for continuous casting, and tundish for continuous casting |
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| CN107214327A (en) * | 2017-07-14 | 2017-09-29 | 山东钢铁股份有限公司 | A kind of continuous casting production bar shaped air curtain barricade wall and its installation method |
| CN107225231A (en) * | 2017-07-14 | 2017-10-03 | 山东钢铁股份有限公司 | A kind of annular air curtain barricade wall of continuous casting production and its molten steel air purge method |
| CN111348904A (en) * | 2020-02-26 | 2020-06-30 | 郑州大学 | Tundish gas curtain retaining wall argon-blowing slag line protective sleeve and preparation method thereof |
-
2021
- 2021-04-15 CN CN202110404280.2A patent/CN115213387A/en active Pending
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|---|---|---|---|---|
| JP2006035272A (en) * | 2004-07-27 | 2006-02-09 | Jfe Steel Kk | Method for removing inclusion in tundish for continuous casting, and tundish for continuous casting |
| CN101121199A (en) * | 2007-09-12 | 2008-02-13 | 北京科技大学 | Continuous casting tundish gas curtain removing nonmetal impurities method |
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