CN115673268A - Method for producing automobile outer plate by using head furnace - Google Patents
Method for producing automobile outer plate by using head furnace Download PDFInfo
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- CN115673268A CN115673268A CN202211188437.3A CN202211188437A CN115673268A CN 115673268 A CN115673268 A CN 115673268A CN 202211188437 A CN202211188437 A CN 202211188437A CN 115673268 A CN115673268 A CN 115673268A
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- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 72
- 239000010959 steel Substances 0.000 claims abstract description 72
- 238000000034 method Methods 0.000 claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 42
- 238000009749 continuous casting Methods 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 26
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 30
- 238000005070 sampling Methods 0.000 claims description 29
- 229910052786 argon Inorganic materials 0.000 claims description 15
- 230000004907 flux Effects 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 5
- 230000003749 cleanliness Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
The application relates to the technical field of continuous casting, and discloses a method for producing an automobile outer plate by using a head furnace. The method comprises the following steps: controlling the tundish to reduce the internal oxygen content; when the oxygen content is reduced to a preset threshold value, controlling the steel ladle to pour molten steel into the tundish; when the tundish reaches a first set tonnage value, adding a covering agent into the tundish; when the tundish reaches a second set tonnage value, controlling the tundish to pour molten steel to the crystallizer; adding the casting slag into a crystallizer; adding the covering slag into a crystallizer; and cutting off the head of the plate blank by a preset length to produce the plate blank of the outer plate of the automobile. This application can improve the slab quality level, reaches the requirement for quality of automobile planking slab.
Description
Technical Field
The application relates to the technical field of continuous casting, in particular to a method for producing an automobile outer plate by using a head furnace.
Background
The requirement of the outer plate of the automobile on inclusion slag is extremely high, the sensitivity of the stamping workshop of a main automobile factory on inclusion is extremely high, and the requirement on zero tolerance of inclusion is met. Therefore, the control of inclusions is very important in the current steel-making production process of the automobile outer plate. The continuous casting process is used as a link for producing a plate blank, and the control of the process from molten steel to the plate blank is extremely important for controlling the contact of the molten steel and air. Meanwhile, when the head furnace is started for casting, the liquid level of the tundish fluctuates, and the operation in the covering agent adding process has great influence on the cleanliness of molten steel, so most of the head furnace does not produce an automobile outer plate, and a plate blank of the head furnace is not used as the automobile outer plate. The factor that influences head stove molten steel cleanliness factor is more, wherein mainly includes: 1) When molten steel enters a tundish from a ladle, the molten steel is in contact with air in the tundish to be oxidized to form inclusions, so that the quality of the molten steel is influenced; 2) The influence of the addition of a covering agent and the tonnage maintenance on the molten steel oxidation in the tundish is avoided; 3) The control of adding the protective slag and the three paths of argon into the crystallizer easily causes slag entrapment and liquid level fluctuation.
Disclosure of Invention
The application aims to provide a method for producing an automobile outer plate by using a head furnace, which improves the quality level of a plate blank and meets the quality requirement of the plate blank of the automobile outer plate. .
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to an aspect of an embodiment of the present application, there is provided a method of producing an automobile outer panel by a head furnace, the method including: controlling the tundish to reduce the internal oxygen content; when the oxygen content is reduced to a preset threshold value, controlling the steel ladle to pour molten steel into the tundish; when the tundish reaches a first set tonnage value, adding a covering agent into the tundish; when the tundish reaches a second set tonnage value, controlling the tundish to pour molten steel to the crystallizer; adding the casting slag into a crystallizer; adding the covering slag into a crystallizer; and cutting off the head of the plate blank by a preset length to produce the plate blank of the outer plate of the automobile.
In some embodiments, in the controlling the tundish to reduce the internal oxygen content, the method further comprises: baking the tundish, and closing baking after baking the tundish for a set baking time; argon is introduced to reduce the oxygen content in the tundish.
In some embodiments, when the tundish reaches the first set tonnage value, then adding a blanketing agent to the tundish, the method further comprises: adding covering agent from baking holes on two sides of the tundish; when the covering agent is uniformly dispersed and distributed in the molten steel, the covering agent is put into an impact area in the middle of the tundish.
In some embodiments, after the pouring the covering agent into the middle of the tundish when the covering agent is uniformly dispersed in the molten steel, the method further comprises: and (4) finishing feeding the covering agent before the tundish reaches a third set tonnage value or before the pulling speed of the continuous casting machine rises to a third set speed, and sealing the baking hole and the impact area.
In some embodiments, in the adding of the primary slag to the crystallizer, the method further comprises: and when the amount of the molten steel in the crystallizer reaches a first set position, adding the casting slag into the crystallizer.
In some embodiments, in the adding of the mold flux to the mold, the method further comprises: and when the amount of the molten steel in the crystallizer reaches a second set position, adding the first-time covering slag into the crystallizer, and when the crystallizer starts to vibrate and the continuous casting machine has a pulling speed, adding the second-time covering slag into the crystallizer.
In some embodiments, the method includes the steps of, after the mold is filled with the first mold flux when the amount of molten steel in the mold reaches the second set position and after the mold is vibrated and the continuous casting machine is pulled, filling the second mold flux into the mold, wherein the method includes: when the crystallizer starts to vibrate, the pulling speed of the continuous casting machine is a first set speed; controlling the continuous casting machine to automatically increase the speed from the first set speed to a second set speed, and keeping the first set constant time at the second set speed; after the first set constant time, controlling the continuous casting machine to automatically increase the speed from the second set speed to a third set speed, and keeping the second set constant time at the third set speed; and after the second set constant time, controlling the continuous casting machine to automatically increase the speed from the third set speed to the target speed.
In some embodiments, after automatically ramping up from a third set speed to a target speed after the second set constant time, the method further comprises: argon is introduced into the stopper rod and the upper nozzle of the tundish and between the upper nozzle and the submerged nozzle, so that the oxygen content in the tundish is reduced.
In some embodiments, after the controlling of the molten steel in the ladle to be poured into the tundish when the oxygen content is reduced to the preset threshold, the method further includes: and after the ladle starts to pour and reaches a fourth set tonnage value, sampling the tundish at least once to detect the content of oxidized impurities in the molten steel, and not sampling any more if sampling components return before pouring is finished.
In some embodiments, after the ladle starts pouring and reaches a fourth set tonnage value, at least one sampling is performed on the tundish to detect the content of oxidized impurities in the molten steel, and if the sampling component returns before pouring is finished, the sampling is not performed, and the method further comprises the following steps: when the ladle begins to pour and reaches a fourth set tonnage value, sampling for the first time is carried out on the tundish; and when the fifth set tonnage value of the ladle is remained, sampling the tundish for the second time.
By the technical scheme of this application more than, compare with prior art, its beneficial effect that is showing lies in: according to the method, the oxygen content in the tundish is reasonably controlled, the covering agent is added, the tonnage rising control and the high tonnage control of the tundish are realized, the process oxidability is reduced, the casting speed control in the crystallizer and the casting slag adding time control are realized, the three argon control paths of the tundish and the preset length cutting of the head of the plate blank are optimized, and the like, so that the molten steel quality of the head furnace is improved, the quality level of the plate blank is improved, and the quality requirement of the outer plate and the plate blank of an automobile is met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 shows a flow diagram according to one embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
According to some embodiments, the present application provides a method of producing an outer panel for an automobile by a head furnace, the method comprising: step 101, controlling a tundish to reduce the internal oxygen content; step 102, when the oxygen content is reduced to a preset threshold value, controlling a steel ladle to pour molten steel into a tundish; 103, when the tundish reaches the first set tonnage value, adding a covering agent into the tundish; 104, when the tundish reaches a second set tonnage value, controlling the tundish to pour molten steel to the crystallizer; 105, adding casting slag into a crystallizer; step 106, adding the covering slag into a crystallizer; and step 107, cutting off the head of the plate blank by a preset length, and then producing the plate blank of the outer plate of the automobile.
Based on the above embodiment, in step 101, the oxygen content in the continuous casting tundish needs to be controlled first: baking the tundish firstly, after the tundish is baked for a set baking time, closing the baking before the molten steel is poured, simultaneously opening an argon pipeline, introducing argon to form low oxygen partial pressure in the tundish and reduce the oxygen content in the tundish, and the first step is directly carried out when the ladle is poured. Wherein, set for the time of toasting and can set for according to actual demand.
Further, in step 102, when the oxygen content is reduced to a preset threshold, the ladle is controlled to pour molten steel into the tundish. The preset threshold value can be set according to actual requirements to prevent molten steel from being oxidized, and the time for introducing argon can be determined according to the speed setting of oxygen content reduction and the value of oxygen content.
Further, in step 103, when the tundish reaches the first predetermined tonnage value, a covering agent is added to the tundish. Wherein the first set tonnage value can be set according to actual demand, and in some embodiments of the present application, the first set tonnage value is set to 40t. Firstly, molten steel in a ladle flows into a tundish from a long nozzle, secondary oxidation of the molten steel is easily caused by exposure of the molten steel to air, the oxygen content in the molten steel is increased, and the quality is poor. Therefore, the first furnace is started to be poured, and the covering agent is added when the tonnage of the tundish reaches 40t.
Further, in step 104, when the tundish reaches the second set tonnage value, the tundish is controlled to pour the molten steel into the crystallizer. Wherein the second set ton bit value can be set according to actual demand, and in some embodiments of the present application, the second set ton bit value is set to 50t. When the tonnage of the tundish reaches 50 tons, the tundish is started to be poured.
Further, in step 105, when the amount of molten steel in the mold reaches the first set position, the casting slag is added to the mold. Wherein, the first setting position can be set according to actual requirements, and in some embodiments of the present application, the first setting position is set to 1/2 position of the side hole of the submerged nozzle. When the molten steel amount in the crystallizer is over 1/2 position of the side hole of the submerged nozzle, the casting slag is pushed in, the temperature of the molten steel is ensured, and the heating value is provided.
Further, in step 106, when the amount of molten steel in the mold reaches the second set position, the first mold flux is added to the mold, and when the mold starts to vibrate and the continuous casting machine has a casting speed, the second mold flux is added to the mold. Wherein, the second setting position can be set according to actual requirements, and in some embodiments of the present application, the second setting position is set to be between +100mm and-150 mm beyond the upper edge of the side hole of the submerged nozzle. When the molten steel amount in the crystallizer exceeds the position between +100mm and-150 mm of the upper edge of the side hole of the submerged nozzle, 1/3 of the covering slag is added, and when the crystallizer starts to vibrate and the continuous casting machine has the pulling speed, the residual covering slag is added.
Further, in step 107, the head of the blank is cut off by a predetermined length to manufacture the outer panel blank of the automobile. The preset length can be set according to actual requirements, in some embodiments of the application, a first block of the head of the plate blank is cut off according to 7300mm, a second block of the head of the plate blank is cut off according to 8300mm after the first block is cut off, and the first block and the second block are automatically changed in steel treatment. The rest of the slabs can be subsequently produced according to the automobile outer plate slabs.
According to the method, the oxygen content in the tundish is reasonably controlled, the covering agent is added, the tonnage rising control and the high tonnage control of the tundish are performed, the process oxidability is reduced, the casting speed in the crystallizer is controlled, the casting time of the mold flux is controlled, the three argon control paths of the tundish and the cutting preset length of the head of the plate blank are optimized, the quality of molten steel in the head furnace is improved, the quality level of the plate blank is improved, and the quality requirement of the outer plate blank is met.
According to some embodiments, in step 103, when the tundish reaches the first set tonnage value, then adding a covering agent to the tundish, the method further comprises: adding covering agent from baking holes on two sides of the tundish; when the covering agent is uniformly dispersed and distributed in the molten steel, the covering agent is put into an impact area in the middle of the tundish.
According to some embodiments, after the pouring the covering agent into the middle of the tundish while the covering agent is uniformly dispersed in the molten steel, the method further comprises: and (4) finishing throwing the covering agent before the tundish reaches a third set tonnage value or before the casting speed of the continuous casting machine is increased to a third set speed, and sealing the baking hole and the impact area.
Based on the above embodiments, the third set tonnage value and the third set speed can be set according to actual demand, and in some embodiments of the present application, the third set tonnage value is set to 70t, and the third set speed is set to 0.8m/min. When the covering agent is put in, because the tundish is a high retaining wall, 200Kg of the covering agent is firstly put into the baking holes at two sides respectively, and the covering agent is scattered and uniformly distributed in the flowing of molten steel, 230Kg of the covering agent is put into an impact area again, and 630Kg of the covering agent is put into the impact area in total. The casting is finished before the tonnage of the tundish is increased to 70t or the casting speed is increased to 0.8m/min. The covering agent is reasonably put in, so that the molten steel can be prevented from being oxidized to generate impurities.
Further, after the covering agent is added, a special asbestos cover plate is used for flatly covering 4 baking holes, and a U-shaped plate is used for covering and sealing the impact area.
According to some embodiments, after the mold is charged with the first mold flux when the amount of molten steel in the mold reaches the second set position and after the mold is vibrated and the continuous casting machine has a casting speed, the method includes: when the crystallizer starts to vibrate, the pulling speed of the continuous casting machine is a first set speed; controlling the continuous casting machine to automatically increase the speed from the first set speed to a second set speed and keeping the first set constant time at the second set speed; after the first set constant time, controlling the continuous casting machine to automatically increase the speed from the second set speed to a third set speed, and keeping the second set constant time at the third set speed; and after the second set constant time, controlling the continuous casting machine to automatically increase the speed from the third set speed to the target speed.
Based on the above-described embodiments, the first set speed, the second set speed, the first set constant time, the third set speed, and the second set constant time may be set according to actual demands, and in some embodiments of the present application, the first set speed is set to 0.2m/min, the second set speed is set to 0.4m/min, the first set constant time is set to 30s, the third set speed is set to 0.8m/min, and the second set constant time is set to 90s. In some embodiments, the continuous casting draw rate is controlled as: in the pulling speed raising stage at the initial casting starting stage, after casting, the speed after the crystallizer starts to vibrate is 0.2m/min, then the speed is automatically raised to 0.4m/min, the speed is maintained for 30s, then the speed is raised to 0.8m/min, the speed is maintained for 90s, and the speed is directly raised to the target pulling speed.
Further, after the automatic speed increase from the third set speed to the target speed after the second set constant time, the method further includes: argon is introduced into the stopper rod and the upper nozzle of the tundish and between the upper nozzle and the submerged nozzle, so that the oxygen content in the tundish is reduced. The three paths of argon are controlled according to the inlet speeds of 5L/min of a stopper rod, 5L/min of an upper water gap and 6L/min of plates.
According to some embodiments, after the controlling of the molten steel in the ladle to be poured into the tundish when the oxygen content is reduced to the preset threshold, the method further comprises: and after the ladle starts to pour and reaches a fourth set tonnage value, sampling at least once to the tundish to detect the oxidized impurity content in the molten steel, and if the sampling component returns before pouring is finished, no sampling is carried out.
According to some embodiments, after the ladle starts pouring and reaches a fourth set tonnage value, at least one sampling is performed on the tundish to detect the oxidized impurity content in the molten steel, and if the sampling component returns before the pouring is finished, the sampling is not performed, and the method further comprises the following steps: when the ladle begins to pour and reaches a fourth set tonnage value, sampling for the first time is carried out on the tundish; and when the fifth set tonnage value of the ladle remains, performing secondary sampling on the tundish.
Based on the above embodiments, the fourth set tonnage value and the fifth set tonnage value can be set according to actual requirements, and in some embodiments of the present application, the fourth set tonnage value is set to 100t, and the fifth set tonnage value is set to 30t. When the pouring of the ladle reaches 100t, the first sampling is carried out on the tundish, and when the ladle remains for 30t, the second sampling is carried out on the tundish. In some embodiments, multiple samplings may be performed between the first sampling and the second sampling. In some embodiments, the second sampling is not performed after the first sampled sample component is returned.
In some embodiments, when a first furnace of a certain-time galvanized automobile outer panel SDX56D steel is smelted, the section is 1600mm multiplied by 237mm, after a ladle roaster is lifted up, an argon valve is opened, gas in a tundish is filled with argon, the reduction of oxygen partial pressure is completed, after a tundish car is in place and centered, after a large-ladle molten steel is started, the molten steel in the ladle flows into the tundish from a long nozzle, when the tonnage of the molten steel for continuously casting the tundish reaches 40 tons, a covering agent is firstly added from a stopper rod hole, 200kg is respectively added to two roasting empty positions, the rest 230kg of the covering agent is added from a ladle opening sprue of the tundish after the covering agent is uniformly dispersed in the flowing of the molten steel, and the charging of the covering agent is completed when 70 tons are reached, and the total amount is 630kg. When the tonnage of the tundish reaches 50 tons, the continuous casting stopper rod is lifted to flow downwards, molten steel enters the crystallizer through the submerged nozzle, and (1) when the inflow of the molten steel reaches 1/2 position of a side hole of the submerged nozzle, 5kg of casting start slag is added, so that the temperature of the molten steel is ensured, and the heat is provided. (2) When the inflow amount of molten steel reaches about 100mm on the side hole of the submerged nozzle, 1/3 of the mold flux is added, the mold starts to vibrate, and the remaining mold flux is added after the continuous casting machine has a casting speed. Reducing the contact between the molten steel and the air.
In the pulling speed increasing stage at the initial casting stage, the pulling speed is 0.4m/min after the crystallizer starts to vibrate, then the pulling speed is increased to 0.4m/min, an automatic program is increased from 0.4m/min to 0.8m/min, when the pulling speed is increased to 0.8m/min, the pulling speed is directly increased to a target pulling speed of 1.6m/min after 90 seconds, three paths of argon are controlled according to 5L/min of a stopper rod, 5L/min of a water feeding port and 6L/min of an inter-plate, a first block at the head of a slab is cut off according to 7300mm, a second block after the first block is cut off according to 8300mm, and the first block and the second block are automatically changed in steel for disposal. And performing subsequent production on the rest slabs according to the automobile outer plate slabs.
By the method, the overall control of the quality of the head furnace can be completed, large impurities and rolling slag in the casting starting stage are concentrated on the head blank, and the impurities in an unstable state can be used as an outer plate in the No. 3 block of the head furnace.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method of producing an outer panel for an automobile by a head furnace, the method comprising:
controlling the tundish to reduce the internal oxygen content;
when the oxygen content is reduced to a preset threshold value, controlling the steel ladle to pour molten steel into the tundish;
when the tundish reaches a first set tonnage value, adding a covering agent into the tundish;
when the tundish reaches a second set tonnage value, controlling the tundish to pour molten steel to the crystallizer;
adding the casting slag into a crystallizer;
adding the covering slag into a crystallizer;
and cutting off the head of the plate blank by a preset length to produce the plate blank of the outer plate of the automobile.
2. The method of claim 1, wherein in the controlling the tundish to reduce the internal oxygen content, the method further comprises:
baking the tundish, and closing baking after baking the tundish for a set baking time;
argon is introduced to reduce the oxygen content in the tundish.
3. The method of claim 1, wherein adding a covering agent to the tundish when the tundish reaches the first set tonnage value, the method further comprising:
adding covering agent from baking holes on two sides of the tundish;
when the covering agent is uniformly dispersed and distributed in the molten steel, the covering agent is put into an impact area in the middle of the tundish.
4. The method according to claim 3, wherein after the pouring of the covering agent into the middle of the tundish while the covering agent is uniformly dispersed in the molten steel, the method further comprises:
and (4) finishing feeding the covering agent before the tundish reaches a third set tonnage value or before the pulling speed of the continuous casting machine rises to a third set speed, and sealing the baking hole and the impact area.
5. The method of claim 1, wherein in said adding of the open-cast slag to the crystallizer, the method further comprises:
and when the amount of the molten steel in the crystallizer reaches a first set position, adding the casting slag into the crystallizer.
6. The method according to claim 1, wherein in the feeding of mold flux to the crystallizer, the method further comprises:
and when the amount of the molten steel in the crystallizer reaches a second set position, adding the first-time covering slag into the crystallizer, and when the crystallizer starts to vibrate and the continuous casting machine has a pulling speed, adding the second-time covering slag into the crystallizer.
7. The method of claim 6, wherein after the mold is charged with the first mold flux when the amount of molten steel in the mold reaches the second set position and the mold is charged with the second mold flux after the mold starts to oscillate and the continuous casting machine has a casting speed, the method comprises:
when the crystallizer starts to vibrate, the casting speed of the continuous casting machine is a first set speed;
controlling the continuous casting machine to automatically increase the speed from the first set speed to a second set speed, and keeping the first set constant time at the second set speed;
after the first set constant time, controlling the continuous casting machine to automatically increase the speed from the second set speed to a third set speed, and keeping the second set constant time at the third set speed; .
And after the second set constant time, controlling the continuous casting machine to automatically increase the speed from the third set speed to the target speed.
8. The method of claim 7, wherein after automatically ramping up from a third set speed to a target speed after the second set constant time, the method further comprises:
argon is introduced into the stopper rod and the upper nozzle of the tundish and between the upper nozzle and the submerged nozzle, so that the oxygen content in the tundish is reduced.
9. The method of claim 1, wherein after controlling the molten steel in the ladle to be poured into the tundish when the oxygen content is reduced to the preset threshold, the method further comprises:
and after the ladle starts to pour and reaches a fourth set tonnage value, sampling the tundish at least once to detect the content of oxidized impurities in the molten steel, and not sampling any more if sampling components return before pouring is finished.
10. The method of claim 9, wherein after the ladle starts pouring and reaches a fourth set tonnage value, the ladle is sampled at least once for detecting an oxidized content of impurities in the molten steel, and the sampling is stopped if a sampling component returns before the pouring is finished, the method further comprising:
when the steel ladle begins to pour and reaches a fourth set tonnage value, sampling for the first time from the tundish;
and when the fifth set tonnage value of the ladle is remained, sampling the tundish for the second time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211188437.3A CN115673268A (en) | 2022-09-27 | 2022-09-27 | Method for producing automobile outer plate by using head furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211188437.3A CN115673268A (en) | 2022-09-27 | 2022-09-27 | Method for producing automobile outer plate by using head furnace |
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| CN115673268A true CN115673268A (en) | 2023-02-03 |
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| CN202211188437.3A Pending CN115673268A (en) | 2022-09-27 | 2022-09-27 | Method for producing automobile outer plate by using head furnace |
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- 2022-09-27 CN CN202211188437.3A patent/CN115673268A/en active Pending
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