CN115213366A - Method for quickly replacing steel grade of large-section continuous casting production line - Google Patents
Method for quickly replacing steel grade of large-section continuous casting production line Download PDFInfo
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- CN115213366A CN115213366A CN202210868769.XA CN202210868769A CN115213366A CN 115213366 A CN115213366 A CN 115213366A CN 202210868769 A CN202210868769 A CN 202210868769A CN 115213366 A CN115213366 A CN 115213366A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000009749 continuous casting Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 239000002893 slag Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000005499 meniscus Effects 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a method for quickly replacing steel grades in a large-section continuous casting production line, which comprises the following steps: stopping pouring of the original bale; when the original tundish molten steel is reduced to a first preset weight, baking the new tundish and stopping heating; stopping pouring and driving away the original tundish, and returning the pulling speed to zero when the casting blank is pulled down to a first preset length; after the original tundish drives away from the tundish for a first preset time, starting a new tundish car, and dropping a new tundish from the middle nozzle until the new tundish drops to a first preset height; pouring a new ladle; and when the molten steel of the new tundish rises to the second preset weight, the new tundish starts to cast. The invention realizes the operation of quickly changing the tundish of the large-section round billet, and can avoid steel leakage accidents without connecting pieces.
Description
Technical Field
The invention relates to the field of continuous casting, in particular to a method for quickly replacing steel grade in a large-section continuous casting production line.
Background
With the development of continuous casting technology, how to improve the effective operation rate of a large-section continuous casting machine has become a problem generally concerned by the majority of steel production enterprises. Factors influencing the operating rate of the large-section casting machine are many, wherein the casting steel grade needs to be replaced by replacing a tundish in the continuous casting production process, but the shutdown time is one of important influencing factors when the tundish is replaced by a new tundish. At present, average time for replacing different casting steel types by most large-section continuous casting machine production enterprises generally reaches 200-230 minutes, a connector needs to be inserted in the quick-change process of a few steel mills, however, the hot-change is completed by inserting the connector, at least 15 minutes is needed, and the long hot-change time has great influence on improving the operation rate of the casting machine, reducing energy and medium consumption and the like.
When the heat exchange operation is carried out on a large-section continuous casting machine, in the process of heat exchange of a tundish, molten steel in a crystallizer is easy to solidify, so that the molten steel of the next tundish is separated from a cast steel billet in the previous furnace after being poured into the crystallizer, the steel billet in the crystallizer cannot be connected, continuous pouring cannot be carried out, the cast billet in the crystallizer and the molten steel poured into the crystallizer later are separated or leaked, and the continuous casting heat exchange operation is seriously restricted.
In the prior art, although a continuous casting tundish hot quick-change process does not need to insert a connecting piece for hot change, such as Yibanwu, and continuous casting tundish hot quick-change process practice [ J ], science and technology wind, 2019 (6): 2, the aimed casting blanks are all plate blanks, and the process cannot be applied to a quick-change steel grade of a continuous casting production line of large-section round billets.
Disclosure of Invention
The invention aims to provide the following method for solving the problems of different casting steel grades in a large-section continuous casting machine.
A method for quickly replacing steel grades in a large-section continuous casting production line comprises the following steps:
s1: baking the new tundish to be on-line;
s2: stopping pouring the original bale and rotating the rotary table;
s3: when the weight of the original tundish molten steel is reduced to a first preset weight, a new tundish is baked and stopped, the new tundish is placed at the adjacent position of the original tundish, when the weight of the original tundish molten steel is lower than the first preset weight, molten steel in the tundish is easy to generate turbulence, impurities enter the molten steel, and the quality of a casting blank is influenced;
s4: stopping pouring the original tundish, closing a stopper rod, lifting the tundish and then removing the tundish, starting to return the casting speed to zero when the casting blank is pulled down to a first preset length, and cleaning a crystallizer slag ring after the casting speed returns to zero;
s5: after the original tundish is driven away from the casting position for a first preset time, starting a new tundish car to the casting position, centering a water gap, and dropping the new tundish until the new tundish drops to a first preset height; checking that the covering slag is on the black slag surface, and cleaning a slag ring after supplementing the covering slag;
s6: rotating the ladle turret to enable the new ladle nozzle to rotate into the impact area, then installing the new ladle nozzle, tightly pushing the manipulator, and opening the sliding nozzle for casting;
s7: when the molten steel in the new tundish rises to a second preset weight, the new tundish starts to pour;
the new tundish is poured for a second preset time, and the blank drawing speed is increased according to a preset speed increasing rule;
when the third preset time is up to the beginning of the drawing, the water flow of the foot roller is increased;
and when the new tundish is started to be poured for the fourth preset time, the new tundish falls to the normal pouring height.
The first preset weight is 17-35t; the second preset weight is 12-18t;
the first preset length is 40-80mm;
the first preset height is 170-190mm above the liquid level of the normal crystallizer;
the first preset time is 30-40s; the second preset time is 20-40s; the third preset time is 0.5-1.5min; the fourth preset time is 2-3min.
In the step S1, the specific operation process of baking the new tundish is as follows: building a new tundish off line, baking the new tundish to be more than 1100 ℃, baking the tundish for not less than 240min, and ensuring that the temperature of the tundish before casting is more than or equal to 1100 ℃; baking the whole water gap 2.5 hours before casting to ensure that the baking temperature is more than or equal to 400 ℃.
In step S2, the concrete operation process of stopping pouring of the original bale is as follows: dismantling the original tundish continuous temperature measuring pipe and the protective plate; and (3) installing a sliding water gap mechanism after the new ladle of molten steel is seated, rotating the original ladle cover to the position above the new ladle of molten steel, keeping the cross arm at the highest position, and rotating the new ladle to a pouring position after the original ladle stops pouring.
In the step S5, the concrete operation of cleaning the slag ring is as follows: and fishing out the slag ring, and if the slag ring is not fished out, stacking the slag ring to the middle.
After the slag ring is cleaned, an arc-shaped transition layer exists between the molten steel and the crystallizer, in order to ensure that the transition layer does not have a solid state, a slag fishing rod is required to perform ring-cutting treatment at the meniscus of a blank shell of the crystallizer after the slag ring is cleaned, and the shrinkage slag ring is disordered and cleaned up.
Preferably, the number of strokes is 2-5.
The preset speed increasing rule in the step S7 includes:
before the casting blank is discharged out of the crystallizer, the pulling speed is 0.1-0.15m/min, the manual control is carried out, and if the pulling speed is too high, the steel leakage phenomenon is easy to generate;
and after the casting blank is discharged from the crystallizer, the casting speed is restored to the normal casting speed and is automatically controlled.
And S7, increasing the water flow of the foot roll from the normal pouring amount to 45-70L so as to ensure the thickness of the shell of the blank and avoid the phenomenon of steel leakage under the condition that the casting blank does not generate cracks.
Adding the covering slag in the step S7;
and in the step S7, when the new tundish falls to the normal casting height, the depth of the water gap inserted into the liquid level is 80-130mm.
The method for quickly replacing the steel grade of the large-section continuous casting production line is applied to the production process of round billets.
The diameter of the section of the round billet is more than or equal to 500mm.
It should be noted that the normal drawing speed, the normal pouring amount and the normal pouring height in the application are the drawing speed, the pouring amount and the pouring height in the conventional continuous casting process, and can be set according to actual conditions.
Compared with the prior art, the invention has the advantages that:
1. this application is through the regulation and control of design throwing speed rule and foot roller discharge, makes the shell of circle base neither produce the crackle, also can not take place the breakout phenomenon.
2. According to the method, ring-cutting treatment is carried out on the crystallizer shell after the slag ring is cleaned, so that the phenomenon of steel leakage of the shell is avoided;
3. the steel grade can be replaced without adopting a connecting piece, so that the labor force is reduced, and the replacement time is saved. By using the method for quickly replacing different pouring sections in continuous casting, the average time for replacing steel grades is reduced from 240 minutes to 5-8 minutes, the process is smooth, safe and effective, and the operating rate of a continuous casting machine is effectively improved.
Drawings
FIG. 1 is a schematic workflow diagram of the present invention;
FIG. 2 is a schematic illustration of a continuous casting system;
in fig. 2, 1 is a ladle, 2 is a tundish, 3 is a crystallizer, 4 is a foot roll, 5 is a ladle nozzle, 6 is a tundish nozzle, and 7 is a casting blank.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
Taking a five-machine five-flow continuous casting machine with an arc radius of 16.5 meters as an example, the flow spacing is 2250mm, the casting blank section phi is 500mm, the maximum capacity of a tundish is 43 tons, the working capacity is 38 tons, the average casting speed is 0.35m/min, the starting casting speed is 0.10m/min, the casting flow of the tundish is controlled by an electric stopper rod, a tubular crystallizer is hydraulically vibrated, the amplitude is 10mm, and the vibration frequency is 200c/min.
The first step is as follows: and building a new tundish off line, baking the new tundish, wherein the baking time of the tundish is 240min, wherein the small fire lasts for 60min, the medium fire lasts for 90min, and then the tundish is baked by the big fire. The temperature of the tundish before casting is ensured to be more than or equal to 1100 ℃, and the temperature of the casting is 1160 ℃. Baking the whole nozzle 2.5 hours before casting to ensure that the baking temperature is more than or equal to 400 ℃ and the temperature of the nozzle is 430 ℃ this time.
The second step is that: dismantling the original tundish continuous temperature measuring pipe and the protective plate; and (4) installing a sliding water gap after the molten steel of the new ladle is poured, rotating a ladle cover of the big ladle to the position above the molten steel of the new ladle, and keeping the cross arm at the highest position. And (4) rotating the rotary table after the original ladle stops pouring, so that the new ladle rotates to the pouring position.
The third step: when the tonnage of the original tundish is poured to 30 tons, the newly baked tundish is stopped, the roaster is lifted, and after the new tundish is lifted, the tundish car is driven to the adjacent fixed position of the original tundish car to be in place.
The fourth step: stopping pouring the original tundish, closing the stopper rod, and lifting the original tundish and then driving away. When the length of the casting blank is pulled to 60mm, the pulling speed begins to return to zero. And rapidly cleaning the slag ring after the pulling speed returns to zero.
The fifth step: and after the original tundish starts to drive away for 35 seconds, a new tundish car is driven to the casting position. And the water gap falls into the tundish after being centered, so that the bottom height of the water gap is 190mm above the normal liquid level in the crystallizer. Checking that the covering slag is on a black slag surface, supplementing the covering slag, continuously cleaning a slag ring, scratching 3 rings at the meniscus of the blank shell of the crystallizer by using a slag dragging rod after the cleaning is finished, and disordering and cleaning the shrinkage slag ring.
And a sixth step: rotating the ladle turret to enable the ladle nozzle to rotate into the impact area and then hang the ladle nozzle, tightly pushing the manipulator, and opening the sliding nozzle for casting.
The seventh step: when the tundish reaches 17t, the tundish is started to pour. After the casting is started for 30 seconds, the pulling speed is given, and the pulling speed before the casting is taken out of the crystallizer is manually controlled at 0.15 m/min. In the process, the covering slag is added in time; after the pulling speed is given for 1 minute, the water flow of the foot roller is increased compared with the normal casting process, and is increased from 40L in the normal process to 50L. And pouring for 2 minutes, and dropping the tundish to a normal pouring height position to ensure that the insertion depth of the water gap is 110mm. And after the casting blank is discharged from the crystallizer, gradually recovering the normal pulling speed to 0.35m/min, automatically controlling, recovering the normal water flow to 40L, and finishing the heat exchange.
By adopting the method for replacing different steel grades, the time for replacing the steel grades is 6 minutes.
Example 2
The casting blank section of this embodiment is Φ 650mm, the parameters are as shown in table 1, and the rest of the operation process is the same as that of embodiment 1.
Example 3
The casting blank section of this embodiment is Φ 800mm, the parameters are shown in table 1, and the rest of the operation process is the same as that of embodiment 1.
TABLE 1 Process parameters for the examples
As shown in the table, for a large-section round billet continuous casting production line, the billet shell obtained by the method for quickly replacing the steel grade provided by the invention has no crack or bleed-out phenomenon, and the time for replacing the steel grade is far shorter than that of a method for completing hot replacement by inserting a connecting piece.
Claims (10)
1. A method for quickly replacing steel grades in a large-section continuous casting production line is characterized by comprising the following steps:
s1: baking the new tundish to be on-line;
s2: stopping pouring the original ladle, and rotating the rotary table;
s3: when the molten steel in the original tundish is reduced to a first preset weight, baking and stopping heating the new tundish, and placing the new tundish at the adjacent position of the original tundish;
s4: stopping pouring and driving away the original tundish, starting to return the pulling speed to zero when the casting blank is pulled down to a first preset length, and cleaning a crystallizer slag ring after the pulling speed returns to zero;
s5: after the original tundish drives away from the casting position for a first preset time, driving a new tundish car to the casting position, and dropping a new tundish at the intermediate water inlet until the new tundish drops to a first preset height; checking that the covering slag is on the black slag surface, and cleaning a slag ring after supplementing the covering slag;
s6: rotating the ladle turret to enable the new ladle nozzle to rotate into the impact area, then installing a new ladle nozzle, and casting the new ladle;
s7: when the molten steel in the new tundish rises to a second preset weight, the new tundish starts to pour;
the new tundish is poured for a second preset time, and the blank drawing speed is increased according to a preset speed increasing rule;
when the third preset time is up to the beginning of the drawing, the water flow of the foot roller is increased;
when the new tundish is poured for a fourth preset time, the new tundish falls to a normal pouring height;
the method is applied to the production process of the round billet.
2. The method for rapidly replacing the steel grade in the large-section continuous casting production line as claimed in claim 1, wherein in the step S5, after the slag ring is cleaned, a slag dragging rod is used for performing ring cutting treatment on the meniscus of the blank shell of the crystallizer, so that the shrinkage slag ring is disturbed and cleaned.
3. The method for rapidly replacing steel grades in a large-section continuous casting production line according to claim 1, wherein the first preset weight is 17-35t; the second preset weight is 12-18t;
the first preset length is 40-80mm;
the first preset height is 170-190mm above the liquid level of the normal crystallizer;
the first preset time is 30-40s; the second preset time is 20-40s; the third preset time is 0.5-1.5min; the fourth preset time is 2-3min.
4. The method for rapidly replacing the steel grade in the large-section continuous casting production line according to claim 1, wherein the water flow rate of the foot roll in the step S7 is increased from a normal pouring rate to 45-70L.
5. The method for rapidly replacing steel grades in a large-section continuous casting production line according to claim 1, wherein the preset speed-up rule comprises the following steps:
before the casting blank is discharged from the crystallizer, the pulling speed is 0.1-0.15m/min, and the control is carried out manually;
and after the casting blank is discharged from the crystallizer, the casting speed is restored to the normal casting speed and is automatically controlled.
6. The method for rapidly replacing the steel grade in the large-section continuous casting production line as claimed in claim 2, wherein in the step S5, the number of the drawing circles is 2-5.
7. The method for rapidly replacing steel grades in a large-section continuous casting production line according to claim 1, wherein in the step S1, the specific operation process of baking the new tundish is as follows: building a new tundish off line, baking the new tundish to a temperature of more than 1100 ℃, wherein the baking time of the tundish is not less than 240min, and the temperature of the tundish before casting is ensured to be more than or equal to 1100 ℃; baking the integral water gap 2.5 hours before casting to ensure that the baking temperature is more than or equal to 400 ℃.
8. The method for rapidly replacing the steel grade in the large-section continuous casting production line as claimed in claim 1, wherein in the step S7, when the new tundish falls to the position of the normal casting height, the depth of the water gap insertion liquid level is 80-130mm.
9. The method for rapidly replacing the steel grade in the large-section continuous casting production line as claimed in claim 1, wherein the diameter of the section of the round billet is more than or equal to 500mm.
10. The method for rapidly replacing the steel grade of the large-section continuous casting production line according to claim 1, wherein the time for replacing the steel grade is 5-8 minutes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116871470A (en) * | 2023-09-06 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Continuous casting method of round billet continuous casting machine special steel type without connecting billet and connecting piece |
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| CN114472835A (en) * | 2022-01-28 | 2022-05-13 | 新疆八一钢铁股份有限公司 | Heat exchange operation method for wide and thick plate blank continuous casting tundish |
| CN114682752A (en) * | 2022-04-06 | 2022-07-01 | 安阳钢铁股份有限公司 | Method for quickly replacing online tundish of ultra-wide thin slab continuous casting machine |
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2022
- 2022-07-22 CN CN202210868769.XA patent/CN115213366B/en active Active
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| DE2101220A1 (en) * | 1971-01-13 | 1972-08-03 | Vereinigte österreichische Eisen- und Stahlwerke AG, Linz (Österreich) | Fully continuous metal casting - with mould melt level adjustment during tundish changeover |
| JP2005186081A (en) * | 2003-12-24 | 2005-07-14 | Nippon Steel Corp | Method for continuously casting molten steel by using hot rotary tundish |
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116871470A (en) * | 2023-09-06 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Continuous casting method of round billet continuous casting machine special steel type without connecting billet and connecting piece |
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| CN115213366B (en) | 2024-03-01 |
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