CN115401193A - Method for hot exchanging tundish in billet continuous casting machine - Google Patents
Method for hot exchanging tundish in billet continuous casting machine Download PDFInfo
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- CN115401193A CN115401193A CN202211189421.4A CN202211189421A CN115401193A CN 115401193 A CN115401193 A CN 115401193A CN 202211189421 A CN202211189421 A CN 202211189421A CN 115401193 A CN115401193 A CN 115401193A
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- tundish
- crystallizer
- withdrawal
- casting
- billet
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- 238000005266 casting Methods 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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
- B22D41/50—Pouring-nozzles
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
-
- 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
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The application provides a method for hot exchange of a tundish in a billet continuous casting machine, when the height of the liquid level of an old tundish is reduced to 200-250mm, the stop casting of the old tundish is completed, then a connecting piece is immediately inserted into molten steel of a crystallizer, and simultaneously the pulling speed is manually adjusted to pull the liquid level to a position 700-750mm away from the upper opening of the crystallizer and then returns to zero; opening the baked new tundish to a pouring position, pouring the big ladle into the new tundish, pouring the new tundish into the crystallizer, and starting the withdrawal and straightening unit according to the rising of the liquid level of the crystallizer to carry out normal production; the hot exchange time is reduced to 8-10 minutes, the operation efficiency of a continuous casting machine is improved, the yield is improved, the production cost is reduced, the accidents of steel leakage and stretch-break are avoided, the casting stop times of a casting machine are reduced, the waste of casting starting raw materials is reduced, the cutting loss is reduced, and the yield of molten steel is also improved.
Description
Technical Field
The invention relates to the technical field of continuous casting, in particular to a tundish heat exchange method in a billet continuous casting machine.
Background
In the continuous casting production process, the tundish can stabilize steel flow, reduce the scouring of the steel flow to a primary blank shell in a crystallizer, store molten steel, ensure the uniform temperature of the molten steel and simultaneously separate and float non-metallic inclusions and the molten steel; on a multi-strand small square billet continuous casting machine, the tundish can also distribute molten steel to each crystallizer to play a role in shunting; the tundish can play a role in buffering when the ladle is replaced, thereby ensuring the normal operation of multi-furnace continuous casting.
With the need of continuous casting development and the continuous development of high-efficiency continuous casting machines, the service life of a tundish directly influences the operating rate of the continuous casting machine, and although various methods for prolonging the service life of the tundish are adopted at present, the effect of performing long-time continuous casting on a single tundish still cannot be realized, and the service life of the tundish is usually 42 hours at present.
The problem that a single tundish cannot be used for a long time is solved by adopting a heat exchange technology of the tundish at present. The influence of the service life of the refractory material of the working layer of the tundish in the continuous casting production process requires stopping casting and starting a new tundish again after a certain time, so that the casting machine is stopped, and the metal yield and the continuous casting operation rate are reduced. In order to avoid the shutdown of the casting machine, a continuous casting tundish heat exchange technology is adopted. The continuous casting tundish hot exchange is to replace the tundish under the condition that the continuous casting machine does not stop casting, so that the continuous casting machine can continuously operate, and the continuous casting operation rate is improved. By adopting the tundish heat exchange technology, the waste of the head and the tail of the casting blank is effectively reduced, and the operating rate of the continuous casting machine is improved. However, in the prior art, the replacement time of the billet continuous casting tundish heat exchange technology is long, generally 10-15 minutes, so that molten steel solidified shells in the crystallizer shrink, and new and old shells in the crystallizer cannot be effectively fused when the tundish heat exchange technology is used, and steel leakage and breakage accidents occur after the billet continuous casting tundish is taken out of the crystallizer.
Disclosure of Invention
The invention aims to provide a tundish heat exchange method in a billet continuous casting machine, which aims to solve or partially solve the technical problems that in the prior art, the tundish heat exchange technology in billet continuous casting is long in exchange time, and steel leakage and billet lying accidents are easily caused.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for hot exchanging a tundish in a billet continuous casting machine comprises the following steps of:
1) When the liquid level of the molten steel of the old tundish is reduced to 200-250mm, operating an accident hydraulic cylinder of a sliding nozzle on the old tundish to stop pouring all the casting flows;
2) Stopping secondary cooling water of the casting flow, and adjusting the pressure of a withdrawal and straightening roller of a withdrawal and straightening machine to 14MPa;
3) Vertically inserting a connecting piece welded by deformed steel bar into the position with the depth larger than 200mm at the right center of a liquid core in a crystallizer, hooking a hanging point of the connecting piece by using a thin oxygen tube, and putting a cold material into the liquid core in the crystallizer for quick cooling to firmly fix the connecting piece;
4) Measuring the position of a tail billet by using a T-shaped scale, and manually starting a withdrawal and straightening machine to pull down the tail billet in the crystallizer;
when the tail billet reaches a distance of 700-750mm from the upper opening of the crystallizer, manually stopping the withdrawal and straightening machine;
5) Moving the old tundish to a baking position, and simultaneously moving the new tundish to a pouring position;
6) Centering the new tundish and the crystallizer by using a centering device;
7) Pressing an automatic ladle transferring button to rotate the ladle to a pouring position, pressing a hydraulic cylinder pull-open button to pour the molten steel in the ladle into a new tundish;
8) Firstly, the intermediate flows of a new tundish are reconnected, and then the two flows of the tundish are reconnected;
after the new tundish is poured, starting a withdrawal and straightening machine when the liquid level in the crystallizer rises to be 100-150mm away from the upper opening of the crystallizer;
and after the casting blank joint is taken out of the withdrawal and straightening machine, the withdrawal and straightening machine is adjusted back to the hot blank pressure, and the hot exchange of the tundish is completed.
Preferably, in the step 3), the cold charge is deformed steel bar with the length of 230mm and the outer diameter of 12mm or 14mm, and 50 +/-5 cold charges with the diameter of 12mm or 40 +/-5 cold charges with the diameter of 14mm are placed in the cold charge.
Preferably, in the step 4), the manual pulling speed is controlled to be 1.0-2.0m/min.
Preferably, in step 6), the centering deviation crystallizer center is less than 10mm.
Preferably, in the step 8), the hot billet pressure of the withdrawal and straightening unit is adjusted to be 3.4MPa.
The application obtains the following beneficial technical effects:
according to the liquid level height of the molten steel of the old tundish, when the liquid level height reaches 200-250mm, stopping casting of the old tundish is completed, immediately inserting a connecting piece into the molten steel of the crystallizer after casting flow stops casting, and simultaneously manually adjusting the pulling speed to pull the liquid level to a position 700-750mm away from the upper opening of the crystallizer and then returning the pulling speed to zero; opening the baked new tundish to a pouring position, pouring the steel ladle into the new tundish, pouring the new tundish into the crystallizer, and starting a withdrawal and straightening machine according to the rising of the liquid level of the crystallizer to carry out normal production;
the heat exchange time is reduced to 8-10 minutes, the heat exchange level of the tundish is improved, the heat exchange success rate reaches 100 percent, and the ordered development of production is ensured;
the flow is blocked according to the liquid level height of the old tundish, so that the flow blocking time is saved, and the heat exchange efficiency is improved by 50%;
opening a new tundish from a baking position to a pouring position, pouring the steel ladle into the new tundish when the new tundish falls to a target position, pouring the new tundish into the crystallizer to enable the liquid level of the crystallizer to rise, and starting a withdrawal and straightening machine to carry out normal production;
the continuous casting tundish heat exchange process greatly improves the capacity of a casting machine, reduces the casting stop times of the casting machine, reduces the waste of casting starting raw materials, reduces the cutting loss, improves the yield of molten steel, improves the operating efficiency of a continuous casting machine, improves the yield, reduces the production cost, avoids the occurrence of steel leakage and snapping accidents, maximizes the capacity and the benefit, and achieves the aims of saving energy and reducing consumption to a certain extent.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The application provides a method for tundish heat exchange in a billet continuous casting machine, which comprises the following steps of:
1) When the liquid level of the molten steel of the old tundish is reduced to 200-250mm, operating an accident hydraulic cylinder of a sliding nozzle on the old tundish to stop pouring all the casting flows;
2) Stopping secondary cooling water of the casting flow, and adjusting the pressure of a withdrawal and straightening roller of a withdrawal and straightening machine to 14MPa;
3) Vertically inserting a connecting piece welded by deformed steel bar into the position with the depth larger than 200mm at the right center of a liquid core in a crystallizer, hooking a hanging point of the connecting piece by using a thin oxygen tube, and putting a cold material into the liquid core in the crystallizer for quick cooling to firmly fix the connecting piece;
4) Measuring the position of a tail billet by using a T-shaped scale, and manually starting a withdrawal and straightening machine to pull down the tail billet in the crystallizer;
when the tail billet reaches a distance of 700-750mm from the upper opening of the crystallizer, manually stopping the withdrawal and straightening machine;
5) Moving the old tundish to a baking position, and simultaneously moving the new tundish to a pouring position;
6) Centering the new tundish and the crystallizer by using a centering device;
7) Pressing an automatic ladle transferring button to rotate the ladle to a pouring position, pressing a hydraulic cylinder pull-open button to pour the molten steel in the ladle into a new tundish;
8) Firstly, the intermediate flows of a new tundish are reconnected, and then the two flows of the tundish are reconnected;
after the new tundish is poured, when the liquid level in the crystallizer rises to be 100-150mm away from the upper opening of the crystallizer, starting a withdrawal and straightening machine;
and after the casting blank joint is taken out of the withdrawal and straightening machine, the withdrawal and straightening machine is adjusted back to the hot blank pressure, and the hot exchange of the tundish is completed.
In one embodiment of the application, in step 3), the cold charge is deformed steel bar with the length of 230mm and the outer diameter of 12mm or 14mm, and 50 +/-5 cold charges with the diameter of 12mm or 40 +/-5 cold charges with the diameter of 14mm are placed.
In one embodiment of the present application, in step 4), the manual pull rate is controlled to be 1.0-2.0m/min.
In one embodiment of the present application, step 6) is carried out until the centering deviation crystallizer center is < 10mm.
In one embodiment of the application, in step 8), the withdrawal and straightening unit is adjusted back to a hot billet pressure of 3.4MPa.
In this application, the package wall structure of middle package is: the thickness of the steel plate, the thickness of the nanometer plate for heat insulation, the thickness of the light brick for heat insulation, the thickness of the permanent lining casting material layer and the thickness of the working layer coating are sequentially 30mm, 5mm, 30mm, 185mm and 40mm from the outside to the inside of the ladle; the service life of the tundish is usually 42 hours, which means that the service life of the working layer coating is 42 hours; the service life of the permanent lining casting material layer is about 1 year, and the specified use times are less than 100 times.
In this application, the connecting piece that the screw-thread steel welded, it is similar to embedded bar, in the cold billet of lower head pre-buried in the crystallizer earlier, in the time of follow-up continuous casting again, link together subsequent casting blank, utilize the screw-thread steel to cluster the two, the connecting piece is welded together with two diameter 25mm, length 500mm screw-thread steel and is made.
In this application, catch on the connecting piece with the thin oxygen pipe, prevent that the connecting piece from dropping, the casting liquid core molten steel that just stopped has not solidified yet, for preventing that the connecting piece from directly putting into the back and totally submerging in the molten steel liquid core and play unable connection effect, so catch with the thin oxygen pipe.
In the application, the steel ladle is filled with molten steel, and the continuous casting is performed by casting the molten steel in the steel ladle into a tundish, and then shunting the molten steel in the tundish into a plurality of crystallizers.
The application provides a working principle of a tundish heat exchange method in a billet continuous casting machine, which comprises the following steps:
the original technology is that after 8 casting flows are completely stopped, a 1# tundish car is started to remove the old tundish from a casting position to a baking position A, then personnel stand in a casting area to adjust the pulling speed of a withdrawal and straightening machine to pull the liquid level of the 8 flows one by one to a position 700-750mm away from the upper opening of a crystallizer, and then the 2# tundish car is started to remove a baked new tundish from the baking position B to the casting position; the new tundish is opened to a pouring position and then is cast and centered, and the operation has great influence on the operation efficiency;
in the prior art, after 1 casting flow is stopped and a connecting piece is placed, the pulling speed of a withdrawal and straightening machine is adjusted to pull down the liquid level of the flow to a position 700-750mm away from the upper opening of a crystallizer (note: after 8 flows are stopped, the liquid level pulling operation of the 8 flows is finished, time is saved), then a 1# tundish car is started to move an old tundish from a casting position to a baking position A, and another person starts a 2# tundish car at the same time, so that the waiting time of starting the car is shortened, casting centering needs to be carried out after a new tundish is moved to the casting position, a limit alarm of the tundish to the casting position is manufactured on site, the person can finely adjust centering, the centering time of the tundish is shortened, the operation shortens the time from multiple aspects compared with the original technology, and the operation efficiency is improved.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
For further understanding of the present invention, the method for hot swap of a tundish in a billet caster according to the present invention is described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
A method for hot exchanging a tundish in a billet continuous casting machine comprises the following steps of:
1) When the liquid level of the molten steel of the old tundish is reduced to 220-240mm, operating an accident hydraulic cylinder of a sliding nozzle on the old tundish to stop pouring all the casting flows;
2) Stopping the secondary cooling water of the casting flow, and adjusting the pressure of a withdrawal and straightening roller of a withdrawal and straightening machine to 14MPa;
3) Vertically inserting a connecting piece welded by deformed steel bar into the position with the depth larger than 200mm at the right center of a liquid core in a crystallizer, hooking a hanging point of the connecting piece by using a thin oxygen tube, and putting a cold material into the liquid core in the crystallizer for quick cooling to firmly fix the connecting piece;
in the step 3), 50 +/-5 cold stocks with the diameter of 12mm are put in;
4) Measuring the position of a tail billet by using a T-shaped scale, manually starting a withdrawal and straightening machine to pull down the tail billet in the crystallizer, and controlling the manual drawing speed to be 2.0 m/min;
stopping the withdrawal and straightening machine manually when the tail billet reaches a distance of 720-740mm from the upper opening of the crystallizer;
5) Moving the old tundish to a baking position, and simultaneously moving the new tundish to a pouring position;
6) Centering the new tundish and the crystallizer by using a centering device until the centering deviation of the center of the crystallizer is less than 10mm;
7) Pressing an automatic ladle transferring button to rotate the ladle to a pouring position, pressing a hydraulic cylinder pull-open button to pour the molten steel in the ladle into a new tundish;
8) Firstly, the intermediate flows of a new tundish are reconnected, and then the two flows of the tundish are reconnected;
after the new tundish is poured, starting a withdrawal and straightening machine when the liquid level in the crystallizer rises to be 700-750mm away from the upper opening of the crystallizer;
and after the casting blank joint is taken out of the tension leveler, the tension leveler is adjusted to the hot blank pressure of 3.4MPa, and the hot exchange of the tundish is completed.
Example 1 the heat-exchange time was reduced to 10 minutes.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (5)
1. A method for hot exchanging a tundish in a billet continuous casting machine is characterized by comprising the following steps of:
1) When the liquid level of the molten steel of the old tundish is reduced to 200-250mm, operating an accident hydraulic cylinder of a sliding nozzle on the old tundish to stop pouring all the casting flows;
2) Stopping the secondary cooling water of the casting flow, and adjusting the pressure of a withdrawal and straightening roller of a withdrawal and straightening machine to 14MPa;
3) Vertically inserting a connecting piece welded by deformed steel bar into the position with the depth larger than 200mm at the right center of a liquid core in a crystallizer, hooking a hanging point of the connecting piece by using a thin oxygen tube, and putting a cold material into the liquid core in the crystallizer for quick cooling to firmly fix the connecting piece;
4) Measuring the position of a tail billet by using a T-shaped scale, and manually starting a withdrawal and straightening machine to pull down the tail billet in the crystallizer;
when the tail billet reaches a distance of 700-750mm from the upper opening of the crystallizer, manually stopping the withdrawal and straightening unit;
5) Moving the old tundish to a baking position, and simultaneously moving the new tundish to a pouring position;
6) Centering the new tundish and the crystallizer by using a centering device;
7) Pressing an automatic ladle transferring button to rotate the ladle to a pouring position, pressing a hydraulic cylinder pull-open button to pour the molten steel in the ladle into a new tundish;
8) Firstly, the intermediate flows of a new tundish are reconnected, and then the two flows of the tundish are reconnected;
after the new tundish is poured, when the liquid level in the crystallizer rises to be 100-150mm away from the upper opening of the crystallizer, starting a withdrawal and straightening machine;
and after the casting blank joint is taken out of the withdrawal and straightening machine, the withdrawal and straightening machine is adjusted back to the hot blank pressure, and the hot exchange of the tundish is completed.
2. The method of claim 1, wherein in the step 3), the cold metal is a screw steel having a length of 230mm, an outer diameter of 12mm or 14mm, and 50 ± 5 cold metal pieces having a diameter of 12mm or 40 ± 5 cold metal pieces having a diameter of 14mm are inserted into the cold metal pieces having a length of 230mm and an outer diameter of 12mm or 14 mm.
3. The method for tundish heat-exchange in a billet caster according to claim 1, characterized in that in step 4), the manual drawing speed is controlled to 1.0-2.0m/min.
4. The method of claim 1, wherein in step 6) the center of the offset mold is centered to less than 10mm.
5. The method for hot swap of a tundish in a continuous billet casting machine according to claim 1, wherein in step 8), the hot billet pressure is adjusted back to 3.4MPa by the withdrawal straightening unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211189421.4A CN115401193A (en) | 2022-09-28 | 2022-09-28 | Method for hot exchanging tundish in billet continuous casting machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211189421.4A CN115401193A (en) | 2022-09-28 | 2022-09-28 | Method for hot exchanging tundish in billet continuous casting machine |
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| CN115401193A true CN115401193A (en) | 2022-11-29 |
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| CN202211189421.4A Pending CN115401193A (en) | 2022-09-28 | 2022-09-28 | Method for hot exchanging tundish in billet continuous casting machine |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030095011A (en) * | 2002-06-11 | 2003-12-18 | 주식회사 포스코 | Method for control changing time of turndish for continuous casting |
| CN102941323A (en) * | 2012-12-12 | 2013-02-27 | 济钢集团有限公司 | Method for quickly replacing tundish at low liquid level of medium thin plate blank continuous casting machine crystallizer |
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Application publication date: 20221129 |