CN107671251B - Tundish low oxygen level control method and device - Google Patents
Tundish low oxygen level control method and device Download PDFInfo
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- CN107671251B CN107671251B CN201710998273.3A CN201710998273A CN107671251B CN 107671251 B CN107671251 B CN 107671251B CN 201710998273 A CN201710998273 A CN 201710998273A CN 107671251 B CN107671251 B CN 107671251B
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
- B22D11/10—Supplying or treating molten metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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Abstract
The invention discloses a tundish low oxygen level control method and a device, which are applied to the technical field of continuous casting, and the method comprises the following steps: after the baking of the tundish at the baking position is finished, opening the tundish and introducing argon into the tundish at a first flow rate; in the time period from the time when the tundish is transported from the baking position to the pouring position and the time when the tundish receives the molten steel from the steel ladle at the pouring position to the time when the tundish is started to be poured, argon is kept to be introduced into the tundish at a first flow rate; when the tundish is poured, adjusting to a second flow rate which is less than the first flow rate and introducing argon into the tundish; in the process of pouring molten steel into the crystallizer by the tundish, adding a covering agent into the tundish, and keeping introducing argon into the tundish at a second flow rate; after the addition of the covering agent into the tundish is finished, the argon gas introduction into the tundish is stopped. The invention solves the technical problems of low cleanliness of molten steel in the molten steel head furnace and low quality of casting blanks.
Description
Technical Field
The invention relates to the technical field of continuous casting, in particular to a tundish low oxygen level control method and device.
Background
The tundish is a tundish between a steel ladle and a crystallizer in continuous casting production in the metallurgical industry, and in order to avoid air from entering molten steel in the casting process, the protective casting measures widely adopted by the conventional tundish mainly comprise 1) adopting a long nozzle for casting between the steel ladle and the tundish; 2) an immersion type water gap is adopted between the tundish and the crystallizer for protection pouring; 3) introducing argon gas between the ladle sliding nozzle and the long nozzle for sealing; 4) argon is introduced between the tundish upper nozzle and the tundish submerged nozzle for sealing; 5) covering agent is added on the surface of the molten steel in the tundish.
In the actual production of the existing pouring measures, the tundish used in the prior art is filled with air in the pouring process, the pouring hole, the baking hole and the stopper rod hole are completely exposed in the molten steel pouring process, and the molten steel is completely exposed in the air before the covering agent is not added, so that a large amount of air suction is caused, oxygen in the air reacts with various components in the molten steel at high temperature to generate various inclusions, so that the internal quality and the flowability of the molten steel are reduced, and the cleanliness of the molten steel of the steel head furnace and the quality of a casting blank are seriously influenced.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling the low oxygen level of a tundish, and solves the technical problems of low cleanliness of molten steel in a molten steel head furnace and low casting blank quality.
In a first aspect, an embodiment of the present invention provides a method for controlling a low oxygen level in a tundish, including:
after the baking of the tundish at the baking position is finished, opening the tundish and introducing argon into the tundish at a first flow rate;
keeping introducing argon into the tundish at the first flow rate in a time period from the transportation of the tundish from the baking position to the pouring position and the receiving of the molten steel from the steel ladle by the tundish at the pouring position to the casting of the tundish;
when the tundish is poured, adjusting to a second flow rate which is smaller than the first flow rate and introducing argon into the tundish;
in the process of pouring molten steel into a crystallizer by the tundish, adding a covering agent into the tundish, and keeping introducing argon into the tundish at the second flow rate;
and stopping introducing the argon into the tundish after the covering agent is added into the tundish.
Optionally, before baking the tundish at the baking position, the method further includes:
paving slag wool on the bag body of the tundish along the edge;
and covering the ladle cover of the tundish on the edge of the upper edge of the tundish body after the slag wool is paved.
Optionally, after the cover of the tundish is covered on the upper edge of the tundish body and before the tundish at the baking position is baked, the method further comprises:
and coating a closed coating at the covering position between the ladle cover of the tundish and the cover body.
Optionally, the opening of the tundish at a first flow rate to introduce argon gas into the tundish includes:
after the baking of the tundish at the baking position is finished, stopping the fire of a ladle baking device for baking the tundish;
lifting the ladle baking device and testing the stopper rod of the tundish;
when an argon switch arranged on an external argon pipeline connected with an argon source is in a closed state, connecting the external argon pipeline to one end of an argon connector on the tundish cover;
and opening the argon switch to a maximum opening degree, and introducing argon into the tundish by taking the maximum flow as the first flow.
Optionally, when the tundish is at the pouring position for pouring, adjusting to introduce argon gas into the tundish at a second flow rate smaller than the first flow rate, including:
and when the tundish is poured, adjusting the argon switch from the maximum opening degree to 20-30% of the maximum opening degree, so that the external argon pipeline leads argon into the tundish at 20-30% of the maximum flow.
Optionally, after stopping introducing the argon gas into the tundish, the method further includes:
covering slag wool at the overflow notch of the tundish.
Optionally, the maximum flow rate is at least 12m3/min。
Optionally, the pressure at the position of the argon switch is controlled to be 1 +/-0.1 MPa.
In a second aspect, an embodiment of the present invention provides a device for controlling a low oxygen level in a tundish, including:
the argon gas introducing control unit is used for opening argon gas at a first flow rate into the tundish after the tundish is baked at the baking position;
the transportation unit is used for keeping introducing argon into the tundish at the first flow rate in the time period from the time when the tundish is transported from the baking position to the pouring position and the time when the tundish receives molten steel from a steel ladle at the pouring position to the time when the tundish is poured;
the flow regulating unit is used for regulating the flow of argon into the tundish at a second flow rate which is smaller than the first flow rate when the tundish is poured, adding a covering agent into the tundish in the process of pouring molten steel into a crystallizer by the tundish, and keeping the flow of argon into the tundish at the second flow rate;
and the argon stopping control unit is used for stopping introducing argon into the tundish after the covering agent is added into the tundish.
Optionally, the flow regulating unit is specifically configured to regulate the argon switch from the maximum opening degree to 20% -30% of the maximum opening degree when the tundish is poured, so that an argon gas source is introduced into the tundish through the argon gas pipeline at 20% -30% of the maximum flow rate.
One or more technical solutions provided by the embodiments of the present invention at least achieve the following technical effects or advantages:
after the baking of the tundish at the baking position is finished, opening the tundish and introducing argon into the tundish at a first flow rate; keeping introducing argon into the tundish at a first flow rate in a time period from the time when the tundish is transported from the baking position to the pouring position and the time when the tundish receives molten steel from a steel ladle at the pouring position to the time when the tundish is started to be poured; when the tundish is poured, adjusting to a second flow rate which is less than the first flow rate and introducing argon into the tundish; and in the process of pouring molten steel into the crystallizer by the tundish, keeping introducing argon into the tundish at the second flow rate, simultaneously adding a covering agent into the tundish, and stopping introducing the argon into the tundish after the covering agent is added into the tundish. Therefore, during the time period from the end of baking the tundish to the end of adding the covering agent into the tundish, argon is continuously introduced into the tundish, so that the surface of molten steel in the tundish is prevented from contacting with air in the casting process, the oxidizing atmosphere of the tundish in the casting process is reduced, the secondary oxidation of the bare molten steel is prevented, and the cleanliness of molten steel in a molten steel head furnace and the quality of a casting blank are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for controlling a low oxygen level of a tundish according to an embodiment of the present invention;
fig. 2 is a block diagram of a low oxygen level control apparatus for a tundish according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a tundish low oxygen level control method, which solves the technical problems of low cleanliness of molten steel in a molten steel head furnace and low casting blank quality, and has the following general ideas:
and in the time period from the end of baking the tundish to the end of adding the covering agent into the tundish, argon is kept to be introduced into the tundish, so that the surface of the molten steel in the tundish is prevented from contacting with air in the casting process, the oxidizing atmosphere of the tundish in the casting process is reduced, the secondary oxidation of the bare molten steel is prevented, and the cleanliness of the molten steel in the steel head furnace and the quality of a casting blank are improved.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, a method for controlling a low oxygen level in a tundish according to an embodiment of the present invention includes the following steps:
s101, after the baking of the tundish at the baking position is finished, opening the tundish and introducing argon into the tundish at a first flow rate.
Specifically, argon is introduced into the tundish at a first flow rate from the moment when the tundish is baked at the baking position.
Specifically, S101 includes the following steps:
first, S1011 is executed: after the baking of the tundish at the baking position is finished, stopping the fire of a ladle baking device for baking the tundish;
then, S1012 is executed: after the ladle baking device is lifted, the stopper rod of the middle ladle is tested.
Next, S1013 is performed: when an argon switch arranged on an external argon pipeline connected with an argon source is in a closed state, the external argon pipeline is connected into one end of an argon connector on the tundish cover.
In the specific implementation process, the other end of the argon connector is connected with an argon pipe in the ladle cover, and the argon pipe in the ladle cover is respectively paved in the three parts in the ladle cover. And an argon source is injected into the tundish through an external argon pipeline, the argon connector and an argon pipe in the ladle cover.
Next, S1014 is executed: and opening an argon switch to the maximum opening degree, and introducing argon into the tundish by taking the first flow as the maximum flow.
The maximum flow rate corresponds to the maximum opening degree of the argon switch. In a specific implementation, the maximum flow rate may be 12m3Min, the diameter of the external argon line can be 3cm, and the pressure of the argon switch is 1 MPa. Specifically, the argon switch may be a gas valve.
S102, in the time period from the time when the tundish is transported from the baking position to the pouring position and the time when the tundish receives the molten steel from the steel ladle at the pouring position to the time when the tundish is started to pour, argon is kept to be introduced into the tundish at the first flow rate.
And S103, when the tundish is poured, adjusting to a second flow rate which is smaller than the first flow rate and introducing argon into the tundish.
Specifically, the second flow rate is 20% -30% of the maximum opening. Then S103 specifically is: when the tundish is poured, the argon switch is adjusted from the maximum opening degree to 20% -30% of the maximum opening degree, so that the external argon pipeline leads argon into the tundish at the flow rate of 20% -30% of the maximum flow rate.
The maximum flow rate can be 12m3For example,/min, the second flow rate is 2.4-3.6 m3And/min. When the pouring of the tundish is started, the thickness is adjusted to be 2.4-3.6 m3And introducing argon into the tundish at min. For example, at 2.4m when the tundish is being started3Introducing argon into the tundish at min, and adjusting the argon flow to 3.6m when the tundish is started to be poured3And introducing argon into the tundish at min. The second flow rate may also be set to 2.5m3/min、2.6m3/min、2.7m3/min、2.8m3/min、2.9m3/min、3.0m3/min、3.1m3/min、3.2m3/min、3.3m3/min、3.4m3/min、3.5m3One of/min.
It should be noted that the ladle keeps pouring the molten steel into the tundish while the tundish is being poured and during pouring the molten steel into the mold.
And S104, adding a covering agent into the tundish in the process of pouring molten steel into the crystallizer by the tundish, and keeping introducing argon into the tundish at a second flow rate.
And S105, stopping introducing the argon into the tundish after the covering agent is added into the tundish.
In the specific implementation process, after the argon gas is stopped flowing into the tundish, the connection between the external argon pipeline and the argon gas joint is also disconnected.
In a further embodiment, in combination with the previous embodiment, the method further avoids the contact between the surface of the tundish molten steel and air during the casting process, and in an embodiment, before baking the tundish at the baking position, the method further comprises the following steps: laying slag wool on the bag body of the tundish along the edge; and covering the cover of the tundish on the edge of the upper edge of the tundish body after the slag wool is laid, so as to ensure that no gap exists between the tundish body and the tundish cover. Thereby, the air entering into the molten steel of the tundish is reduced.
In one embodiment, after the cover of the tundish is covered on the upper edge of the tundish body after the slag wool is laid, and before the tundish at the baking position is baked, the method further comprises the following steps: and coating a sealing coating at the covering part between the ladle cover and the cover body of the tundish. Specifically, the sealing paint may be a coating material.
In one embodiment, after stopping introducing the argon gas into the tundish, the method further comprises: covering slag wool at the overflow notch of the tundish.
In the following, a specific embodiment is given: in the cover a roof with straw area of the tundish, a layer of slag wool is laid on the upper edge of the tundish to ensure that no gap exists between the tundish body and the tundish cover;
after the tundish is baked, stopping heating and lifting the ladle heater, and after a stick is tested, an operator respectively accesses an argon pipe into an argon connector of the tundish cover, and at the moment, the switch of an argon source is ensured to be closed;
connecting an external argon pipeline, opening an argon switch to the maximum, and closing the switch to 20-30% of the opening degree after the argon switch is opened to a pouring position;
normally casting in the casting time, closing an argon gas source after the covering agent is added, and disconnecting an argon blowing pipeline;
covering slag wool at the overflow groove.
The slag wool between the tundish body and the ladle cover ensures that no gap exists, and if the gap exists, the gap is filled with coating materials; the argon pipe is laid in the tundish cover of the tundish, and argon pipelines are respectively laid on three parts of the tundish cover; the diameter of an external argon pipeline is about 3cm, the pressure at a valve is about 1MPa, and the maximum flow is 12m 3/min; the method can reduce the oxygen mass fraction in the tundish to 1% in about 4.5 min.
Based on the same inventive concept, an embodiment of the present invention provides a device for controlling a low oxygen level in a tundish, which is shown in fig. 2 and includes the following structures:
the argon gas introducing control unit 201 is used for opening the tundish and introducing argon gas into the tundish at a first flow rate after the tundish is baked at the baking position;
the transportation unit 202 is used for keeping introducing argon into the tundish at a first flow rate in the time period from the time when the tundish is transported from the baking position to the pouring position and the time when the tundish receives molten steel from a steel ladle at the pouring position to the time when the tundish is poured;
the flow regulating unit 203 is used for regulating the flow of argon into the tundish at a second flow rate smaller than the first flow rate when the tundish is poured, adding a covering agent into the tundish in the process of pouring molten steel into the crystallizer by the tundish, and keeping the flow of argon into the tundish at the second flow rate;
and an argon stopping control unit 204 for stopping the introduction of argon into the tundish after the addition of the covering agent into the tundish is completed.
Specifically, the flow regulating unit is used for regulating the argon switch from the maximum opening degree to 20% -30% of the maximum opening degree when the tundish is poured, so that the external argon pipeline can introduce argon into the tundish at 20% -30% of the maximum flow.
One or more embodiments of the invention provide at least the following technical effects or advantages:
after the baking of the tundish at the baking position is finished, argon is introduced into the tundish at a first flow rate; in the process of introducing argon into the tundish at a first flow rate, transporting the tundish from a baking position to a pouring position; when the pouring basket is positioned at the pouring position for pouring, adjusting to lead argon into the pouring basket at a second flow rate smaller than the first flow rate; in the pouring process of the tundish, the covering agent is added into the tundish while argon is introduced into the tundish at a second flow rate; and stopping introducing the argon into the tundish after the addition of the covering agent is finished. Therefore, after the tundish is baked and before the covering agent is added to the surface of the molten steel in the tundish, argon is continuously introduced into the tundish, so that the surface of the molten steel in the tundish is prevented from contacting with air in the casting process, the oxidizing atmosphere of the tundish in the casting process is reduced, secondary oxidation of the bare molten steel is prevented, and the cleanliness of molten steel in a molten steel head furnace and the quality of a casting blank are improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. A tundish low oxygen level control method is characterized by comprising the following steps:
before baking the tundish at the baking position, laying slag wool on the body of the tundish along the edge; covering the ladle cover of the tundish on the edge of the upper edge of the tundish body after the slag wool is laid; coating a closed coating at the cover joint between the cover of the tundish and the ladle body;
after the baking of the tundish at the baking position is finished, opening the tundish and introducing argon into the tundish at a first flow rate;
the opening of the device for introducing argon into the tundish at a first flow rate comprises the following steps:
after the baking of the tundish at the baking position is finished, stopping the fire of a ladle baking device for baking the tundish;
lifting the ladle baking device and testing the stopper rod of the tundish;
when an argon switch arranged on an external argon pipeline connected with an argon source is in a closed state, connecting the external argon pipeline to one end of an argon connector on the tundish cover;
opening the argon switch to a maximum opening degree, and introducing argon into the tundish by taking the maximum flow as the first flow;
keeping introducing argon into the tundish at the first flow rate in a time period from the transportation of the tundish from the baking position to the pouring position and the receiving of the molten steel from the steel ladle by the tundish at the pouring position to the casting of the tundish;
when the tundish is poured, adjusting to a second flow rate which is smaller than the first flow rate and introducing argon into the tundish; the method comprises the following steps: when the tundish is poured, the argon switch is adjusted from the maximum opening degree to 20% -30% of the maximum opening degree, so that the external argon pipeline leads argon into the tundish at 20% -30% of the maximum flow;
in the process of pouring molten steel into a crystallizer by the tundish, adding a covering agent into the tundish, and keeping introducing argon into the tundish at the second flow rate;
stopping introducing argon into the tundish after the covering agent is added into the tundish;
and covering slag wool at the overflow notch of the tundish after stopping introducing the argon into the tundish.
2. The method of claim 1, wherein the maximum flow rate is at least 12m3/min。
3. The method as claimed in claim 1 or 2, wherein the pressure at the position of the argon switch is controlled to be 1 ± 0.1 MPa.
4. A tundish low oxygen level control apparatus for performing the method of controlling a tundish low oxygen level according to any one of claims 1 to 3, comprising:
the argon gas introducing control unit is used for opening argon gas at a first flow rate into the tundish after the tundish is baked at the baking position;
the transportation unit is used for keeping introducing argon into the tundish at the first flow rate in the time period from the time when the tundish is transported from the baking position to the pouring position and the time when the tundish receives molten steel from a steel ladle at the pouring position to the time when the tundish is poured;
the flow regulating unit is used for regulating the flow of argon into the tundish at a second flow rate which is smaller than the first flow rate when the tundish is poured, adding a covering agent into the tundish in the process of pouring molten steel into a crystallizer by the tundish, and keeping the flow of argon into the tundish at the second flow rate;
the argon stopping control unit is used for stopping introducing argon into the tundish after the covering agent is added into the tundish;
the flow regulating unit is specifically used for regulating the argon switch from the maximum opening degree to 20% -30% of the maximum opening degree when the tundish is poured, so that an argon gas source is introduced into the tundish by the argon pipeline at 20% -30% of the maximum flow rate.
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| CN103264145A (en) * | 2013-06-07 | 2013-08-28 | 鞍钢股份有限公司 | Method for improving cleanliness of liquid steel in first ladle while casting |
| CN203817366U (en) * | 2014-04-30 | 2014-09-10 | 北京科技大学 | Device for completely eliminating tundish secondary oxidation in continuous casting process |
| CN105689694A (en) * | 2016-03-11 | 2016-06-22 | 山东钢铁股份有限公司 | Device and method of sealing and argon-blowing protecting continuous casting tundish |
| CN107159857A (en) * | 2017-04-10 | 2017-09-15 | 首钢总公司 | It is a kind of to prevent from opening the method for pouring process molten steel secondary oxidation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992280A (en) * | 2009-08-10 | 2011-03-30 | 鞍钢股份有限公司 | Method for reducing inclusion content of casting blank |
| CN102847923A (en) * | 2011-06-28 | 2013-01-02 | 宝山钢铁股份有限公司 | Pouring basket with molten steel purity stably improved under low argon consumption and metallurgical method thereof |
| CN103264145A (en) * | 2013-06-07 | 2013-08-28 | 鞍钢股份有限公司 | Method for improving cleanliness of liquid steel in first ladle while casting |
| CN203817366U (en) * | 2014-04-30 | 2014-09-10 | 北京科技大学 | Device for completely eliminating tundish secondary oxidation in continuous casting process |
| CN105689694A (en) * | 2016-03-11 | 2016-06-22 | 山东钢铁股份有限公司 | Device and method of sealing and argon-blowing protecting continuous casting tundish |
| CN107159857A (en) * | 2017-04-10 | 2017-09-15 | 首钢总公司 | It is a kind of to prevent from opening the method for pouring process molten steel secondary oxidation |
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