CN116984600A - Control method for improving quality of continuous casting starting head blank - Google Patents
Control method for improving quality of continuous casting starting head blank Download PDFInfo
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- CN116984600A CN116984600A CN202310698088.8A CN202310698088A CN116984600A CN 116984600 A CN116984600 A CN 116984600A CN 202310698088 A CN202310698088 A CN 202310698088A CN 116984600 A CN116984600 A CN 116984600A
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- tundish
- crystallizer
- liquid level
- control method
- casting
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000009749 continuous casting Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000005266 casting Methods 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 229910052786 argon Inorganic materials 0.000 claims abstract description 25
- 230000000630 rising effect Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 239000002893 slag Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 229910052593 corundum Inorganic materials 0.000 description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000007920 subcutaneous administration Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- 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
- B22D11/08—Accessories for starting the casting procedure
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to the field of steelmaking, and discloses a control method for improving the quality of a continuous casting starting head blank, which comprises the following steps: step one, before pouring molten steel into a tundish by a ladle, argon is blown into the tundish; step two, after the liquid level of the tundish reaches half, the tundish starts to pour into a crystallizer; step three, after the tundish starts to be poured into the crystallizer, controlling the liquid level rising speed of the tundish; and fourthly, controlling the manual control time of casting of the crystallizer, and rapidly throwing the crystallizer into the liquid level automatic control. The control method can effectively control the quantity of the inclusions in the head blank.
Description
Technical Field
The invention relates to the field of steelmaking, in particular to a control method for improving the quality of a continuous casting starting head blank.
Background
The molten steel state at the initial stage of continuous casting can influence the quality of a continuous casting head blank, and internal defects of a casting blank caused by the molten steel state cannot be removed in the processing process, so that the performance of a product can be directly influenced.
Along with the development of the refining process, the purity of the steady-state casting blank is better solved by optimizing the refining process, adopting an alkaline refractory material to reduce the pollution to molten steel, modifying ladle slag to reduce the oxidizing property, optimizing Ar gas sealing performance in pouring pipes of the ladle and the tundish, stabilizing the pulling speed and the like. However, the influence of unsteady casting on nonmetallic inclusions in a casting blank is not researched systematically and quantitatively, and the surface and internal defects of the head blank of the unsteady casting are still not effectively controlled. At present, in the initial state of continuous casting, the cutting length of a secondary oxidation serious head blank is larger than 4000mm (phi 300 round blank), so that more waste is caused, and the waste is serious.
The main sources of inclusions in the head stock of the current non-steady state casting include: the secondary oxidation of molten steel in the process of pouring the 1-steel ladle is mainly in the initial stage of pouring, mainly because air exists in the pouring initial tundish, and the contact of Al on the surface of a small amount of molten steel in the steel ladle pouring and O2 in the air is oxidized into clustered Al2O3 inclusions. This fraction of inclusions is trapped by the solidified strand without coming up in the tundish and the crystallizer. The inclusion produced by gathering 2-protecting slag or middle ladle lining is larger, the diameter reaches more than 120 mu m, the control standard of the common steel type inclusion is exceeded, and the impurities are solidified in the casting blank to influence the quality of the casting blank. Furthermore, inclusion and mold flux slag inclusion easily cause slag inclusion and streak defects on the surface of a cast slab. Therefore, the inclusions in the head blank mainly originate from secondary oxidation in the pouring process, various refining slag, crystallizer slag, tundish lining and the like, and the inclusion components mainly originate from strong deoxidization products such as Al, ca, ti and the like. Because the inclusion has high hardness and poor plasticity, the continuity of the deformation of the material is easily damaged, and the probability of hole shrinkage is larger.
Disclosure of Invention
In order to solve the problem that inclusions in a casting blank subjected to unsteady casting in the prior art affect the performance of a head blank product, the invention provides a control method for improving the quality of a continuous casting starting head blank.
In order to achieve the above object, the present invention provides a control method for improving the quality of a continuous casting starting slab, the control method comprising:
step one, before pouring molten steel into a tundish by a ladle, argon is blown into the tundish;
step two, after the liquid level of the tundish reaches half, the tundish starts to pour into a crystallizer;
step three, after the tundish starts to be poured into the crystallizer, controlling the liquid level rising speed of the tundish;
and fourthly, controlling the manual control time of casting of the crystallizer, and rapidly throwing the crystallizer into the liquid level automatic control.
Preferably, in the first step, argon is blown for a duration of not less than 10min.
Preferably, in the first step, the flow rate of the argon blowing gas is set as follows: 30-50L/min, the pressure is set as follows: 0.1-0.2Mpa.
Preferably, in the third step, the speed of the weight of the molten steel in the tundish is controlled to be not more than 4.5t/min.
Preferably, in the fourth step, the manual control time for casting the crystallizer is not more than 4min.
Preferably, the preset pressure of the withdrawal and straightening machine is increased.
Preferably, the preset pressure of the tension leveler is set to be 0.8-1.3Mpa.
According to the technical scheme, the control method firstly avoids the generation of inclusion by oxidation in the process of molten steel entering the tundish by evacuating oxygen in the tundish, specifically, argon is blown into the tundish to remove air remained in the tundish before molten steel is injected into the tundish, and a small amount of Al on the surface of the molten steel is prevented from being oxidized into clustered Al2O3 inclusion by contact with O2 in the air; secondly, full-flow pouring is performed when the large ladle is started, when the weight of the tundish reaches half, a tundish nozzle is opened to start pouring into the crystallizer, and the liquid level in the tundish is controlled to slowly rise in the pouring process so as to reduce the fluctuation of the liquid level, thereby avoiding slag rolling caused by the fluctuation of the liquid level of the tundish; finally, controlling the manual control time of the casting of the crystallizer, rapidly throwing into the automatic speed-up device, and furthest reducing the fluctuation of the liquid level of the crystallizer when the casting of the crystallizer is started. Through implementation of the three measures, the content of Al2O3 inclusion in the tundish can be effectively reduced, and the phenomenon that the inclusion such as casting powder caused by slag rolling enters the casting blank can be reliably avoided, so that the number of the inclusion in the steel is reduced, and the performance and quality of the steel are improved.
Detailed Description
In the present invention, unless otherwise indicated, terms of orientation such as "away from, near" or "away from" are generally used to refer to the orientation of the term in the normal state of use or are commonly understood by those skilled in the art and should not be considered as limiting the term.
A control method for improving the quality of a continuous casting starting slab, the control method comprising:
step one, before pouring molten steel into a tundish by a ladle, argon is blown into the tundish;
step two, after the intermediate liquid level reaches half, pouring the intermediate ladle into the crystallizer;
step three, after the tundish starts to pour into the crystallizer, controlling the liquid level rising speed of the tundish;
and fourthly, controlling manual control time for casting of the crystallizer, and rapidly throwing the liquid level of the crystallizer for automatic control.
Through implementation of the technical scheme, before molten steel is injected into the tundish, argon is blown into the tundish so as to discharge air in the tundish, and therefore, contact of Al in the molten steel and oxygen in the air is prevented from being oxidized into clustered Al2O3 inclusions. Therefore, by arranging the method of blowing argon into the tundish, the inclusion of Al2O3 generated in the pouring process of the ladle into the tundish can be avoided, and the inclusion content of molten steel in the tundish is controlled.
When the liquid level of molten steel in the tundish is lower, the pouring of the tundish possibly forms a vortex at the position of a tundish nozzle, and after the vortex is generated, casting powder or other impurities originally suspended above the liquid level are sucked into a crystallizer by the vortex and finally solidified in a casting blank, so that the quality of the casting blank is influenced by the impurities in the casting blank.
In order to avoid the formation of vortex in the molten steel in the tundish, after the ladle nozzle is opened, the tundish cannot be immediately poured into the crystallizer, and along with the continuous pouring of the tundish, the liquid level of the tundish is continuously raised until the liquid level of the tundish is raised to half of the total height, and then the tundish nozzle is opened to pour into the crystallizer, so that the vortex generated in the pouring process of the molten steel in the tundish into the crystallizer can be effectively avoided, and slag rolling caused by the vortex is avoided.
Because the liquid level in the tundish is not monitored in real time, only the tundish scale can monitor the total weight of molten steel in the tundish, and an operator can judge the liquid level height in the tundish through the weight of the molten steel monitored by the tundish scale, so that the operator can judge whether pouring into the crystallizer can be started or not through the actual weight of the molten steel in the tundish.
After pouring of the tundish, the ladle nozzle can flow molten steel into the tundish, the ladle nozzle can flow the molten steel in the tundish into the crystallizer, in the process, the rising condition of the molten steel level in the tundish is judged according to the displayed change condition of the molten steel weight in the tundish, and the molten steel level in the tundish is controlled to be stable by adjusting the opening of the ladle nozzle and the opening of the tundish nozzle so as to avoid slag coiling caused by liquid level fluctuation. After about 5 minutes, the tundish reaches the full state, and the tundish is always poured in the full state.
After the crystallizer is started, the dummy ingot head needs to be manually controlled to leave the lower opening of the crystallizer, and then an automatic liquid level control system can be used. In the actual production process, manual operation needs to be completed as soon as possible, and the phenomenon that the liquid level in the tundish fluctuates greatly due to errors caused by manual judgment of the liquid level is avoided, so that slag rolling phenomenon is generated in the crystallizer, and more impurities are contained in the casting blank.
In the automatic liquid level control process, the system can control the pouring speed of the tundish nozzle to the crystallizer, and adjust the opening degree of the tundish nozzle according to the actual height of the liquid level in the crystallizer, and the automatic liquid level control technology can effectively avoid the large fluctuation of the liquid level in the crystallizer, thereby avoiding slag rolling in the crystallizer.
In this embodiment, preferably, in the first step, the argon is blown for a duration of not less than 10 minutes.
In order to ensure that the air in the tundish has been completely exhausted, argon needs to be blown into the tundish for more than 10 minutes.
In this embodiment, preferably, in the first step, the flow rate of the argon-blowing gas is set to be: 30-50L/min, the pressure is set as follows: 0.1-0.2Mpa.
In order to ensure that blowing argon into the tundish can achieve effective evacuation of air, therefore, the air source pressure and flow of argon need to be limited, preferably, the flow of argon is set as: 30-50L/min, the pressure is set as follows: 0.1-0.2Mpa. .
In this embodiment, preferably, in step three, the speed increase of the tundish molten steel weight is controlled to be not more than 4.5t/min.
Because the tundish is generally required to be filled with the molten steel, the liquid level in the tundish also needs to continuously rise after the pouring of the tundish is started, and in order to ensure the stable rise of the liquid level of the tundish, the opening degree of a large ladle nozzle and a tundish nozzle needs to be controlled, so that the stable rise of the liquid level of the tundish can be controlled by controlling the amount of molten steel flowing into and flowing out of the tundish, and the phenomenon of slag rolling in the tundish is avoided. However, since there is no measure for monitoring the liquid level in the tundish, the rise of the liquid level in the tundish is generally determined based on the change of the weight detection value of the molten steel in the tundish, and the rise of the liquid level is generally considered to be in a stable rise state when the weight of the molten steel per minute in the tundish is increased by not more than 4.5 tons.
In this embodiment, preferably, in the fourth step, the manual control time for mold casting is not more than 4 minutes.
After the casting of the crystallizer, the dummy ingot head needs to be manually pulled to a state of leaving the lower opening of the crystallizer, and the manual time for the actual casting of the crystallizer is different from the manual time for the actual casting of the crystallizer due to factors such as a casting starting method, molten steel temperature and the like, but in order to ensure that the liquid level in the crystallizer can be kept stable, the manual operation time needs to be controlled to be not more than 4 minutes, so that the crystallizer can use an automatic liquid level control system as soon as possible, and the effective control of the fluctuation of the liquid level of the crystallizer is realized.
The fluctuation range of the liquid level in the crystallizer is generally required to be within +/-5 mm, and the manual operation is difficult to meet the process requirement, so that an automatic liquid level control system is required to be rapidly adopted to realize accurate control of the liquid level in the crystallizer.
In this embodiment, it is preferable to increase the tension leveler preset pressure.
Because the temperature of the tundish and the crystallizer is lower than that of molten steel during casting of the head blank, the heat energy loss of the molten steel in the tundish and the crystallizer is larger during casting of the head blank, and the fluidity of the molten steel in the crystallizer is influenced in order to avoid the transition of the molten steel losing temperature, so that the temperature of the molten steel during casting of the head blank is higher than that of normal molten steel, the tundish and the crystallizer can be quickly heated by the molten steel with higher temperature, the temperatures of the tundish and the crystallizer can quickly reach an ideal state, and the temperature of the molten steel can be stably changed in the subsequent casting process.
But the higher temperature can influence the internal compactness of the head blank casting blank, so when the head blank goes out of the crystallizer and enters the withdrawal and straightening machine, the preset pressure of the withdrawal and straightening machine can be properly increased, and the internal compactness of the casting head blank casting blank is improved by applying larger external pressure to the head blank casting blank, so that the internal quality of the casting blank is improved.
In this embodiment, the preset pressure of the withdrawal and straightening machine is preferably set to 0.8 to 1.3Mpa.
The preset pressure is set on a plurality of groups of withdrawal and straightening machines closest to the crystallizer, and the compactness of the interior of the casting blank is increased by pressing the casting blank.
And the smaller the preset pressure of the withdrawal and straightening machine closest to the crystallizer is, the preset pressure is set for the withdrawal and straightening machines of 3-5 groups close to the crystallizer, and the subsequent withdrawal and straightening machines can not set the preset pressure any more, because the effect of the preset pressure on the inside of the casting blank is gradually reduced along with the reduction of the temperature.
Along with the gradual stabilization of the temperatures of the molten steel, the crystallizer and the tundish, the preset pressure of the withdrawal and straightening machine can be canceled, and the pressure of the withdrawal and straightening machine only needs to be capable of normally driving the casting blank to move.
One embodiment is: before molten steel is injected, argon is purged to the tundish, specifically, after the ladle baking device is lifted up after the completion of the ladle baking, the tundish argon replacement pipe is placed in the tundish, and the argon pipe head is ensured to be inserted about 200mm below the ladle cover. The argon source pressure is 0.12Mpa, the gas flow rate is 50L/min, and the purging time is 10min.
The speed increasing of the molten steel weight of the tundish is controlled to be 4t/min in the casting stage, the manual casting time of the crystallizer is controlled to be 3min, and the preset pressure of the withdrawal and straightening machine is 1.2Mpa.
Under the condition of the parameter setting, the quality of the head blank is monitored as follows:
center loosening: 1.0 grade shrinkage cavity residual 0.5 grade subcutaneous crack 0 grade subcutaneous bubble 0 grade.
In comparison with another embodiment: before molten steel is injected, argon is purged to the tundish, specifically, after the ladle baking device is lifted up after the completion of the ladle baking, the tundish argon replacement pipe is placed in the tundish, and the argon pipe head is ensured to be inserted about 200mm below the ladle cover. The argon source pressure is 0.12Mpa, the gas flow rate is 50L/min, and the purging time is 3min.
In the casting stage, the speed increase of the weight of the molten steel in the tundish is not controlled, the manual casting control time of the crystallizer is 4min, and the preset pressure of the withdrawal and straightening machine is 0.7Mpa.
Under the condition of setting the parameters, the quality of the head blank is monitored as follows:
center loosening: 1.5 grade shrinkage cavity residual 0.5 grade subcutaneous crack 1.0 grade subcutaneous bubble 0.5 grade.
By comparison, the quality of the head blank steel is obviously improved by increasing the argon purging time of the tundish, controlling the acceleration of the weight of the molten steel of the tundish in the casting stage and setting the preset pressure of the withdrawal and straightening machine.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (7)
1. A control method for improving the quality of a continuous casting starting slab, the control method comprising:
step one, before pouring molten steel into a tundish by a ladle, argon is blown into the tundish;
step two, after the liquid level of the tundish reaches half, the tundish starts to pour into a crystallizer;
step three, after the tundish starts to be poured into the crystallizer, controlling the liquid level rising speed of the tundish;
and fourthly, controlling the manual control time of casting of the crystallizer, and rapidly throwing the crystallizer into the liquid level automatic control.
2. The control method according to claim 1, wherein in the first step, argon is blown for a duration of not less than 10 minutes.
3. The control method according to claim 2, wherein in the first step, the flow rate of the argon blowing gas is set to: 30-50L/min, the pressure is set as follows: 0.1-0.2Mpa.
4. The control method according to claim 1, wherein in the third step, the speed increase of the tundish molten steel weight is controlled to be not more than 4.5t/min.
5. The control method according to claim 1, wherein in the fourth step, the manual mold casting control time is not more than 4 minutes.
6. The control method according to claim 1, wherein the preset pressure of the tension leveler is increased.
7. The method according to claim 6, wherein the preset pressure of the tension leveler is set to 0.8-1.3Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698088.8A CN116984600A (en) | 2023-06-13 | 2023-06-13 | Control method for improving quality of continuous casting starting head blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698088.8A CN116984600A (en) | 2023-06-13 | 2023-06-13 | Control method for improving quality of continuous casting starting head blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116984600A true CN116984600A (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310698088.8A Pending CN116984600A (en) | 2023-06-13 | 2023-06-13 | Control method for improving quality of continuous casting starting head blank |
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| Country | Link |
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| CN (1) | CN116984600A (en) |
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2023
- 2023-06-13 CN CN202310698088.8A patent/CN116984600A/en active Pending
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