CN117696853A - Method for realizing rapid casting by replacing tundish - Google Patents

Method for realizing rapid casting by replacing tundish Download PDF

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Publication number
CN117696853A
CN117696853A CN202311512986.6A CN202311512986A CN117696853A CN 117696853 A CN117696853 A CN 117696853A CN 202311512986 A CN202311512986 A CN 202311512986A CN 117696853 A CN117696853 A CN 117696853A
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China
Prior art keywords
tundish
liquid level
crystallizer
speed
pouring
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Pending
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CN202311512986.6A
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Chinese (zh)
Inventor
薛强
郑英辉
张通
刘冠华
许可
赵艳
郝志琴
邱爱梅
杜秀珍
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
Hegang Leting Steel Co Ltd
Original Assignee
Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
Hegang Leting Steel Co Ltd
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Application filed by Tangshan Iron and Steel Group Co Ltd, HBIS Co Ltd Tangshan Branch, Hegang Leting Steel Co Ltd filed Critical Tangshan Iron and Steel Group Co Ltd
Priority to CN202311512986.6A priority Critical patent/CN117696853A/en
Publication of CN117696853A publication Critical patent/CN117696853A/en
Pending legal-status Critical Current

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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
    • 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)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The invention discloses a method for realizing rapid casting by replacing a tundish, which comprises the following steps: after the ladle stops pouring, when the molten steel in the tundish is left for 40-50 t, the pulling speed is reduced to 0.5-1.0 m/min, and the liquid level control of the crystallizer is changed into a manual mode; closing the stopper when the liquid level of the non-stopper area of the tundish is 250-350 mm, and stopping pouring the tundish; the pulling speed of the tundish after stopping casting is reduced to 0.10-0.20 m/min, the liquid level of the crystallizer is reduced to 400-430 mm until the pulling and straightening are stopped, and the pulling speed is reduced again; separating the front tundish from the pouring position, simultaneously separating the baked rear tundish to the pouring position, descending the tundish car, and centering the submerged nozzle; after the ladle is opened, when the weight of molten steel in the next tundish is more than or equal to 10t, the ladle is opened, and the seedling emergence time is controlled to be 70-120 s; when the liquid level of molten steel is 100-150 mm away from the upper opening of the crystallizer, starting to draw and correct, and starting the automatic control of the liquid level of the crystallizer when the speed rises to the target speed and the speed rising process meets the conditions. The method is simple, has strong operability, reduces the continuous casting standby time and the material consumption of starting cold materials, covering slag and the like, and improves the continuous casting operation rate.

Description

Method for realizing rapid casting by replacing tundish
Technical Field
The invention relates to a metallurgical continuous casting method, in particular to a method for realizing rapid casting by replacing a tundish.
Background
The tundish is an important device used in the continuous casting process of steel, and has the functions of stabilizing the steel flow, reducing the scouring of the steel flow to the primary green shell in the crystallizer, storing molten steel, ensuring the temperature uniformity of the molten steel and the like; in a multi-stream continuous casting system, a tundish receives molten steel poured from a ladle and then is distributed to each mold by a tundish nozzle to play a role of diversion. Because the service life of the crystallizer is far longer than that of a tundish, the traditional method for starting and stopping casting needs to be carried out on the crystallizer for checking, width adjustment and the like from stopping casting to starting casting next time, the required time is usually longer than 1 hour, the labor intensity is increased, the production time is influenced to be longer, and the continuous casting yield and the labor intensity are not beneficial to improvement.
Disclosure of Invention
The invention aims to provide a method for realizing rapid pouring by replacing a tundish so as to accelerate the replacement speed of the tundish.
In order to solve the technical problems, the method comprises the following steps:
1) After the ladle stops pouring, when the molten steel in the tundish is left for 40-50 t, the pulling speed is reduced to 0.5-1.0 m/min, and the liquid level control of the crystallizer is changed into a manual mode;
2) Closing the stopper when the liquid level of the non-stopper area of the tundish is 250-350 mm, and stopping pouring the tundish; the pulling speed of the tundish after stopping casting is reduced to 0.10-0.20 m/min, the liquid level of the crystallizer is reduced to 400-430 mm until the pulling and straightening are stopped, and the pulling speed is reduced again;
3) Separating the front tundish from the pouring position, simultaneously separating the baked rear tundish to the pouring position, descending the tundish car, and centering the submerged nozzle;
4) After the ladle is opened, when the weight of molten steel in the next tundish is more than or equal to 10t, the ladle is opened, and the seedling emergence time is controlled to be 70-120 s;
5) When the liquid level of molten steel is 100-150 mm away from the upper opening of the crystallizer, starting to draw and correct, and starting the automatic control of the liquid level of the crystallizer when the speed rises to the target speed and the speed rising process meets the conditions.
Further, in the step 1), the pull speed is reduced by 0.2-0.6 m/min 2 。
Further, in the step 2), the pulling speed of the tundish after stopping pouring is reduced by 0.2-0.6 m/min 2 The liquid level of the crystallizer is reduced to 400-430 mm until the speed of withdrawal and straightening is not less than 20m/min 2 。
Further, in the step 4), the superheat degree of the pouring box during pouring is controlled to be 15-40 ℃.
Further, in the step 5), after starting, the step is started, the rising speed is firstly 2.0-3.0 m/min 2 Accelerating to 0.30-0.50 m/min and maintaining for 50-100 s, and accelerating to 0.2-0.6 m/min again 2 Accelerating to 0.5-1.0 m/min and maintaining for 60-120 s, and finally accelerating to 0.2-0.6 m/min 2 And increasing the pulling speed to the target pulling speed.
Furthermore, the automatic control starting condition of the crystallizer liquid level in the step 5) is that the crystallizer liquid level is stabilized to be 100mm away from the upper opening of the crystallizer or the liquid level height is set for 10s by the automatic control system of the crystallizer liquid level.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the invention not only can improve the labor intensity, but also can improve the continuous casting yield and the continuous casting operation rate, and well solves the problems existing in the prior art; compared with a stop casting and start casting mode, the method can obviously shorten the start casting preparation time, improve the continuous casting yield and the continuous casting operation rate, reduce the number of head blanks and tail blanks and effectively reduce the production cost.
The method is simple, has strong operability, reduces the continuous casting standby time and the material consumption of starting cold materials, covering slag and the like, and improves the continuous casting operation rate; after the invention is adopted, the number of continuous casting furnaces and the casting times yield can be improved, the number of head blanks and tail blanks can be reduced, and the production cost can be effectively reduced; the continuous casting operation rate is improved, the ladle turnover rate is also improved, the heat loss caused by low heat accumulation of the ladle and the tundish in the steelmaking process can be reduced, the production of the steelmaking process is more stable, the outlet temperature of the converter and the refining process can be reduced, and the production cost can be reduced.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The method for realizing rapid pouring of the replacing tundish comprises the following steps:
1) After stopping pouring of the ladle, optimizing the fixed length of the casting blank, and when the molten steel in the tundish is remained for 40-50 t, the pulling speed is 0.2-0.6 m/min 2 The speed of the reduction is reduced to 0.5 to 1.0m/min, preferably 0.50m/min 2 The speed of the liquid level of the crystallizer is reduced to 0.80m/min, and the liquid level control of the crystallizer is changed into a manual mode;
when the section specifications of the products of the previous casting time and the quick-change casting time of the tundish are inconsistent, online width adjustment is carried out when the final casting time of the previous casting time and/or the head blank of the tundish is quickly changed, and the single adjustment or the single casting blank width adjustment range is less than or equal to 100mm;
the weight of the molten steel of the tundish can be controlled according to the specification of casting blanks, and the weight of the molten steel of the tundish is controlled to be 45-50 t for safety because of large steel passing amount when the large-section quick-change is performed, and the weight of the molten steel of the tundish is controlled to be 40-50 t when the non-large-section quick-change is performed; the latter tundish in baking can be flamed out in advance, and after flameout, the later tundish waits for 1-2 min.
2) Closing the stopper when the liquid level of the non-stopper area of the tundish is 250-350 mm, and stopping pouring the tundish; pulling speed of the pouring basket after stopping pouring is 0.2-0.6 m/min 2 The speed reduction is reduced to 0.10-0.20 m/min, preferably 0.50m/min 2 The method comprises the steps of carrying out a first treatment on the surface of the When the liquid level of the crystallizer is reduced to 400-430 mmAgain at a speed of not less than 20m/min 2 The pulling speed and the speed are reduced to be preferably 35m/min 2 Until the withdrawal and straightening are stopped; when the pulling speed is reduced to below 0.30m/min, the secondary cooling water valve is closed manually; and when the tundish is started to be pulled up after the tundish is replaced later, the secondary cooling water control mode is switched to the automatic control mode.
3) Separating the front tundish from the pouring position, simultaneously separating the baked rear tundish to the pouring position, descending the tundish car, and centering the submerged nozzle;
before changing the package, the baking time of the next middle package is controlled to be 3.5-4 hours, the baking temperature is 1100-1250 ℃ and kept more than 30 minutes, and the baking temperature is not more than 1300 ℃ at the highest; the baked tundish is adjusted to walk at a low speed when walking at a high speed to a distance of 1-1.5 m from the pouring position, so that the preparation time is shortened and the centering of the tundish is facilitated.
4) After the ladle is opened, when the weight of molten steel in the next tundish is more than or equal to 10t, the ladle is opened, the seedling emergence time is controlled to be 70-120 s, and the seedling emergence time is preferably controlled to be 70-90 s; the seedling emergence time refers to the period from when molten steel starts to be injected into the crystallizer to when the withdrawal and straightening machine starts to withdraw the steel;
according to different steel grades and specifications of products, the pouring superheat degree of the tundish is controlled to be 15-40 ℃; controlling the wide surface flow of the crystallizer to be 3980-4270L/min and the narrow surface flow of the crystallizer to be 480-570L/min; the opposite side water quantity difference is not more than 30L/min; the consumption of the casting powder slag is 0.30-0.50 kg/t steel, and the liquid slag layer is 6-13 mm; thus, by controlling the water quantity of the crystallizer and the using amount of the covering slag, the tail blank in the crystallizer forms shrinkage cavities with certain size, and is demoulded, so that the solidified blank shell in the crystallizer is convenient to be tightly combined with the newly poured molten steel.
5) Starting to draw and correct when the liquid level of molten steel is 100-150 mm away from the upper opening of the crystallizer, expanding the liquid level to a target drawing speed, and starting the automatic control of the liquid level of the crystallizer when the expanding speed process meets the conditions;
in the process of expanding, the pull speed control method comprises the following steps: after starting, the rising speed is firstly 2.0-3.0 m/min 2 Accelerating to 0.30-0.50 m/min and maintaining for 50-100 s, and accelerating to 0.2-0.6 m/min again 2 Accelerating to 0.5-1.0 m/min and maintaining for 60-120 s, and finally accelerating to 0.2-0.6 m/min 2 Raising the pulling speed to the target pulling speed; the preferred pull rate control method is as follows: after starting, the rising speed is firstly 2.50m/min 2 Accelerating to 0.40m/min and holding for 60s, and accelerating again to 0.50m/min 2 Accelerating to 0.80m/min and holding for 90s, and finally accelerating to 0.50m/min 2 Raising the pulling speed to the target pulling speed;
the conditions for starting the automatic control of the liquid level of the crystallizer are as follows: the liquid level of the crystallizer is stabilized to a position 100mm away from the upper opening of the crystallizer or the liquid level is set to be 10 seconds later by an automatic liquid level control system of the crystallizer.
6) After the method is adopted, the tundish quick change and the continuous casting machine start casting time are less than or equal to 5min, wherein the shutdown time is less than or equal to 2min.
Example 1: the method for realizing rapid pouring by replacing the tundish is specifically as follows.
The method comprises the steps of rapidly replacing a low-carbon steel tundish with the specification of 1600 x 230mm to produce the low-carbon steel tundish with the specification of 1300 x 230mm, carrying out online width adjustment on the former casting time, wherein the single width adjustment is respectively 100mm, 100mm and 100mm, the pulling speed is 1.30m/min, the tundish rapid replacement time is 4min, and the starting casting time of a continuous casting machine is 1.5min; the replacement steps are as follows:
1) After stopping pouring of the ladle, optimizing the fixed length of the casting blank, and when the molten steel in the tundish is left for 43t, the casting blank is at 0.50m/min 2 The speed and the pulling speed of the crystallizer are reduced to 0.80m/min, and the liquid level control mode of the crystallizer is changed from an automatic mode to a manual mode when the pouring is stopped for 1min from the tundish;
2) When the liquid level of the non-stopper area of the tundish is 284mm, closing the stopper, stopping pouring the tundish, and pulling the tundish at a speed of 0.50m/min after stopping pouring 2 Is reduced to 0.20m/min; the liquid level of the crystallizer is reduced to 410mm until the withdrawal and straightening are stopped, and the withdrawal speed is reduced to 35m/min 2 The method comprises the steps of carrying out a first treatment on the surface of the When the pulling speed is reduced to 0.30m/min, the secondary cooling water valve is closed manually;
3) The pouring stopping tundish is separated from the pouring position, the baked tundish is simultaneously opened to the pouring position, the tundish car is lowered, and the submerged nozzle is centered; the baking time of the tundish is 4 hours, the baking temperature is 1100-1250 ℃ and is kept for 38 minutes, and the final baking temperature is 1248 ℃; the baked tundish is adjusted to walk at a low speed when walking at a high speed to a distance of 1m from the pouring position;
4) After the ladle is opened, the ladle is opened when the weight of the molten steel in the tundish is 12t, the superheat degree of the ladle is 35 ℃, and the seedling emergence time is 70s;
5) The withdrawal and straightening are started when the liquid surface of the molten steel is 145mm away from the upper opening of the crystallizer, and the rising speed is 2.50m/min after the withdrawal and straightening are started 2 The speed is increased to 0.40m/min and kept for 60s, when the pulling speed is increased to 0.30m/min, the secondary cooling water control mode is switched to the 'automatic control' mode, and the speed is increased to 0.50m/min again 2 Accelerating to 0.80m/min and holding for 90s, and finally accelerating to 0.50m/min 2 Increasing the temperature to 1.30m/min; the crystallizer liquid level is stabilized to be 100mm away from the upper opening of the crystallizer, and the automatic control of the crystallizer liquid level is started.
Example 2: the method for realizing rapid pouring by replacing the tundish is specifically as follows.
The medium carbon steel with the specification of 1830 x 230mm and 1750 x 230mm is produced by quick-changing a medium carbon steel middle ladle, the width is regulated on line in the previous casting time, 80mm is regulated once, the pulling speed is 1.20m/min, the starting casting time of the tundish quick-changing and continuous casting machine is 4min, and the shutdown time is 2min; the replacement steps are as follows:
1) After stopping pouring of the ladle, optimizing the fixed length of the casting blank, and when the molten steel in the tundish is remained for 45t, the casting blank is at 0.60m/min 2 The speed and the pulling speed of the crystallizer are reduced to 0.5m/min, and the liquid level control mode of the crystallizer is changed from an automatic mode to a manual mode when the pouring is stopped for 1min from the tundish;
2) Closing the stopper when the liquid level of the non-stopper area of the tundish is 276mm, stopping pouring the tundish, and pulling the tundish at a speed of 0.60m/min after stopping pouring 2 Is reduced to 0.10m/min; the liquid level of the crystallizer is reduced to 412mm until the withdrawal and straightening are stopped, and the withdrawal speed is reduced to 30m/min 2 The method comprises the steps of carrying out a first treatment on the surface of the When the pulling speed is reduced to 0.30m/min, the secondary cooling water valve is closed manually;
3) The pouring stopping tundish is separated from the pouring position, the baked tundish is simultaneously opened to the pouring position, the tundish car is lowered, and the submerged nozzle is centered; the baking time of the tundish is 3.7 hours, the baking temperature is 1100-1250 ℃ and is kept for 34 minutes, and the final baking temperature is 1254 ℃; the baked tundish is adjusted to walk at a low speed when walking at a high speed to a distance of 1.2m from the pouring position;
4) After the ladle is opened, the ladle is opened when the weight of the molten steel in the tundish is 11t, the superheat degree of the ladle is 26 ℃, and the seedling emergence time is 90s;
5) The withdrawal and straightening are started when the liquid surface of the molten steel is 140mm away from the upper opening of the crystallizer, and the rising speed is firstly 2.0m/min after the withdrawal and straightening are started 2 Accelerating to 0.30m/minWhen the pulling speed rises to 0.30m/min after 80s is maintained, the secondary cooling water control mode is switched to the automatic control mode, and the rising speed is 0.20m/min again 2 Accelerating to 0.50m/min and holding for 60s, and finally accelerating to 0.40m/min 2 Increasing the temperature to 1.20m/min; and after reaching the set liquid level height of the crystallizer liquid level automatic control system for 10 seconds, starting the crystallizer liquid level automatic control.
Example 3: the method for realizing rapid pouring by replacing the tundish is specifically as follows.
The medium carbon steel tundish quick change with the specification of 1650 mm is used for producing low carbon steel with the specification of 1400 mm and 230mm, the pulling speed is 1.40m/min, the on-line width adjustment is carried out on the tundish quick change casting times, the single width adjustment is respectively 100mm, 100mm and 50mm, the starting casting time of the tundish quick change and the continuous casting machine is 4min, and the shutdown time is 2min; the replacement steps are as follows:
1) After stopping pouring of the ladle, optimizing the fixed length of the casting blank, and when the molten steel in the tundish is remained for 50t, the casting blank is at 0.40m/min 2 The speed and the pulling speed of the crystallizer are reduced to 1.0m/min, and the liquid level control mode of the crystallizer is changed from an automatic mode to a manual mode when the pouring is stopped for 1min from the tundish;
2) Closing the stopper when the liquid level of the non-stopper area of the tundish is 350mm, stopping pouring the tundish, and pulling the tundish at a speed of 0.20m/min after stopping pouring 2 Is reduced to 0.15m/min; the liquid level of the crystallizer is reduced to 430mm until the withdrawal and straightening are stopped, and the withdrawal speed is reduced to 20m/min 2 The method comprises the steps of carrying out a first treatment on the surface of the When the pulling speed is reduced to 0.28m/min, the secondary cooling water valve is closed manually;
3) The pouring stopping tundish is separated from the pouring position, the baked tundish is simultaneously opened to the pouring position, the tundish car is lowered, and the submerged nozzle is centered; the baking time of the tundish is 3.5 hours, the baking temperature is 1200-1250 ℃ and is kept for 32 minutes, and the final baking temperature is 1300 ℃; the baked tundish is adjusted to walk at a low speed when walking at a high speed to a distance of 1.5m from the pouring position;
4) After the ladle is opened, the ladle is opened when the weight of the molten steel in the tundish is 10.5t, the superheat degree of the ladle is 15 ℃, and the seedling emergence time is 80s;
5) The withdrawal straightening is started when the liquid surface of the molten steel is 100mm away from the upper opening of the crystallizer, and the rising speed is 3.0m/min after the withdrawal straightening is started 2 Accelerating to 0.45m/min and keeping for 50s, and switching the secondary cooling water control mode to automatic control when the pulling speed rises to 0.30m/minMode of braking, again at an ascending rate of 0.60m/min 2 Accelerating to 1.0m/min and maintaining for 100s, and finally accelerating to 0.60m/min 2 Increasing the temperature to 1.40m/min; the crystallizer liquid level is stabilized to be 100mm away from the upper opening of the crystallizer, and the automatic control of the crystallizer liquid level is started.
Example 4: the method for realizing rapid pouring by replacing the tundish is specifically as follows.
Rapidly changing a ladle of a peritectic steel grade with the specification of 1400 x 230mm to produce a medium carbon steel grade with the specification of 1300 x 230mm, on-line width adjustment in the previous casting time, single width adjustment of 100mm, pull speed of 1.40m/min, rapid tundish change and continuous casting machine start casting time of 4min, wherein the shutdown time of 1.5min; the replacement steps are as follows:
1) After stopping pouring of the ladle, optimizing the fixed length of the casting blank, and when the molten steel in the tundish is remained for 40t, the casting blank is at 0.20m/min 2 The speed and the pulling speed of the crystallizer are reduced to 0.70m/min, and when the pouring is stopped for 1min from the tundish, the liquid level control mode of the crystallizer is changed from an automatic mode to a manual mode;
2) When the liquid level of the non-stopper area of the tundish is 250mm, closing the stopper, stopping pouring the tundish, and pulling the tundish at a speed of 0.40m/min after stopping pouring 2 Is reduced to 0.20m/min; the liquid level of the crystallizer is reduced to 400mm until the withdrawal and straightening are stopped, and the withdrawal speed is reduced to 32m/min 2 The method comprises the steps of carrying out a first treatment on the surface of the When the pulling speed is reduced to 0.30m/min, the secondary cooling water valve is closed manually;
3) The pouring stopping tundish is separated from the pouring position, the baked tundish is simultaneously opened to the pouring position, the tundish car is lowered, and the submerged nozzle is centered; the baking time of the tundish is 3.8 hours, the baking temperature is 1100-1150 ℃ and is kept for 33 minutes, and the final baking temperature is 1251 ℃; the baked tundish is adjusted to walk at a low speed when walking at a high speed to a distance of 1m from the pouring position;
4) After the ladle is opened, the ladle is opened when the weight of the molten steel in the tundish is 10t, the superheat degree of the ladle is 40 ℃, and the seedling emergence time is 75s;
5) The withdrawal and straightening are started when the liquid surface of the molten steel is 150mm away from the upper opening of the crystallizer, and the rising speed is firstly 2.5m/min after the withdrawal and straightening are started 2 The speed is increased to 0.50m/min and kept for 100s, when the pulling speed is increased to 0.30m/min, the secondary cooling water control mode is switched to the 'automatic control' mode, and the speed is increased to 0.40m/min again 2 Accelerating to 0.70m/min and maintaining for 120s, and finally accelerating to 0.20m/min 2 Increasing the temperature to 1.40m/min; and after reaching the set liquid level height of the crystallizer liquid level automatic control system for 10 seconds, starting the crystallizer liquid level automatic control.

Claims (6)

1. A method for realizing rapid casting by replacing a tundish is characterized by comprising the following steps:
1) After the ladle stops pouring, when the molten steel in the tundish is left for 40-50 t, the pulling speed is reduced to 0.5-1.0 m/min, and the liquid level control of the crystallizer is changed into a manual mode;
2) Closing the stopper when the liquid level of the non-stopper area of the tundish is 250-350 mm, and stopping pouring the tundish; the pulling speed of the tundish after stopping casting is reduced to 0.10-0.20 m/min, the liquid level of the crystallizer is reduced to 400-430 mm until the pulling and straightening are stopped, and the pulling speed is reduced again;
3) Separating the front tundish from the pouring position, simultaneously separating the baked rear tundish to the pouring position, descending the tundish car, and centering the submerged nozzle;
4) After the ladle is opened, when the weight of molten steel in the next tundish is more than or equal to 10t, the ladle is opened, and the seedling emergence time is controlled to be 70-120 s;
5) When the liquid level of molten steel is 100-150 mm away from the upper opening of the crystallizer, starting to draw and correct, and starting the automatic control of the liquid level of the crystallizer when the speed rises to the target speed and the speed rising process meets the conditions.
2. The method for replacing a tundish to achieve rapid casting according to claim 1, wherein: in the step 1), the pull speed is reduced to 0.2-0.6 m/min 2 。
3. The method for replacing a tundish to achieve rapid casting according to claim 1, wherein: in the step 2), the speed reduction of the pulling speed of the pouring basket after stopping pouring is 0.2-0.6 m/min 2 The liquid level of the crystallizer is reduced to 400-430 mm until the speed of withdrawal and straightening is not less than 20m/min 2 。
4. The method for replacing a tundish to achieve rapid casting according to claim 1, wherein: in the step 4), the pouring superheat degree of the tundish is controlled to be 15-40 ℃.
5. The method for replacing a tundish to achieve rapid casting according to claim 1, wherein: in the step 5), after starting, the rising speed is firstly 2.0-3.0 m/min 2 Accelerating to 0.30-0.50 m/min and maintaining for 50-100 s, and accelerating to 0.2-0.6 m/min again 2 Accelerating to 0.5-1.0 m/min and maintaining for 60-120 s, and finally accelerating to 0.2-0.6 m/min 2 And increasing the pulling speed to the target pulling speed.
6. A method of replacing a tundish for rapid casting according to any of claims 1-5, characterized in that: the automatic control starting condition of the crystallizer liquid level in the step 5) is that the crystallizer liquid level is stabilized to be 100mm away from the upper opening of the crystallizer or the liquid level height is set for 10s by the automatic crystallizer liquid level control system.
CN202311512986.6A 2023-11-14 2023-11-14 Method for realizing rapid casting by replacing tundish Pending CN117696853A (en)

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CN117696853A true CN117696853A (en) 2024-03-15

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