CN109732072A - A method of applying homophilic charge to inhibit submersed nozzle inner wall dross - Google Patents
A method of applying homophilic charge to inhibit submersed nozzle inner wall dross Download PDFInfo
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- CN109732072A CN109732072A CN201910205858.4A CN201910205858A CN109732072A CN 109732072 A CN109732072 A CN 109732072A CN 201910205858 A CN201910205858 A CN 201910205858A CN 109732072 A CN109732072 A CN 109732072A
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- submersed nozzle
- inhibit
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- dross
- nozzle inner
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Abstract
The invention belongs to metallurgical continuous casting fields, and in particular to a method of apply homophilic charge to inhibit submersed nozzle inner wall dross.Technical scheme is as follows: a method of applying homophilic charge to inhibit submersed nozzle inner wall dross, apply a stable forward current in submersed nozzle inner wall, it limits field trash with adherency behavior in the sintering of submersed nozzle inner wall, and then inhibits nozzle clogging.The homophilic charge provided by the invention that applies can effectively inhibit the dross behavior of mouth of a river inner wall to inhibit the method for submersed nozzle inner wall dross by the active force that identical charges repel each other between charge.
Description
Technical field
The invention belongs to metallurgical continuous casting fields, and in particular to a kind of application homophilic charge is to inhibit submersed nozzle inner wall knot
The method of tumor.
Background technique
Relative to significantly improving for nozzle material thermal shock resistance, dross blocking, dross and slag line erosion have become leaching
Enter formula mouth of a river military service Problem of Failure common during military service.Serious nozzle clogging behavior even will cause submersed nozzle
It is completely plugged, and then cause continuous casting interrupt production accident.
Effectively control and prevent the submersed nozzle in continuous casting process dross problem be always in continuous casting process always
In exploration and perfect project.Currently, the method for main control nozzle clogging is generally by control deoxidation products aluminium oxide
Production quantity；Deoxidation products is set to form the low-melting compound for being easy to float as far as possible by modes such as Calcium treatments；Appropriateness is blown
The floating of gas agitating acceleration deoxidation products alumina inclusion；Reduce by mouth of a river refractory material to molten steel supply oxygen and change and it is excellent
The modes such as mouth of a river interior wall construction and material of change control the dross problem of submersed nozzle.
But in the actual production process, above-mentioned several nozzle clogging modes can change larger and serious mention due to technique
Rise production cost.And in handling steel when the more steel of aluminium content, there is no ideal for the control effect of nozzle clogging
Improvement.Therefore, it develops a kind of reasonable and easily prevents submersed nozzle dross technology from becoming particularly significant.
Although the formation of nozzle clogging is a complicated physical and chemical process, the influence factor and condition being related to be more and phase
Mutually influence.But correlative study finds that in casting process, there are certain potential differences between mouth of a river inner wall and molten steel, and its
Numerical value is positively correlated with casting rate.And it demonstrates in casting process, flows through the alumina inclusion in the mouth of a river due to high speed
Friction behavior and the phenomenon that generate certain transient state positive charge.
Summary of the invention
The present invention provides a kind of application homophilic charge to inhibit the method for submersed nozzle inner wall dross, can pass through charge
Between the active force that identical charges repel each other and effectively inhibit the dross behavior of mouth of a river inner wall.
Technical scheme is as follows:
A method of applying homophilic charge to inhibit submersed nozzle inner wall dross, applies one in submersed nozzle inner wall
Stable forward current limits field trash with adherency behavior in the sintering of submersed nozzle inner wall, and then inhibits the mouth of a river
Dross, while the amount of inclusions in steel is improved.
Further, the application homophilic charge is to inhibit the method for submersed nozzle inner wall dross, specific steps are as follows:
Groove is opened up on the original submersed nozzle surface of aluminium carbonaceous, plain conductor is put into the groove, with high-temperature cement and resistance to
Guncotton seals the groove；The recess width is connect in 2-3cm, the end that the plain conductor exposes with DC power supply.
Further, the application homophilic charge is to inhibit the method for submersed nozzle inner wall dross, wherein the gold
Category conducting wire is steel wire, molybdenum filament or tungsten wire, has certain heat-resisting ability.
Further, the application homophilic charge is to inhibit the method for submersed nozzle inner wall dross, wherein the gold
Category conducting wire is pure molybdenum filament, a diameter of 0.8-1.5mm.
Further, the application homophilic charge is to inhibit the method for submersed nozzle inner wall dross will before casting
Submersed nozzle carries out high temperature preheating baking, and baking time is 2 hours.
Further, the application homophilic charge is to inhibit the method for submersed nozzle inner wall dross, wherein described straight
The current control in galvanic electricity source between 2-5A, casting rate control within 2.1m/min, cast temperature 1540-1560 DEG C it
Between.
The invention has the benefit that
1, the present invention forms stable electric field using a stable DC stream is applied in mouth of a river wall surface, so that due to rubbing
It wipes and generates the inclusion particles of transient charges and can not be adhered to mouth of a river inner wall due to the effect of mutual expelling force and form adherency dross
And dross object；It is even more impossible to any chemical reaction occurs between the slag line interlayer of mouth of a river wall surface and mouth of a river own material.It is tied at the mouth of a river
Nozzle material is also protected while tumor is inhibited, allow continuous casting production process safe and stable and efficiently into
Row.Even if normal casting operation 12h or more, mouth of a river inner wall slag line remain unchanged relatively intact；Casting furnace number can be increased completely, continued
Expand single casting yield.Simultaneously because the effect that homophilic charge generates mutual expelling force is also possible to flow through between the field trash at the mouth of a river
It can not mutually be contacted, and then be unable to get further aggregation and grow up, so that the inclusion size inside final slab
The amount of inclusions whole inside slab can also obtain certain reduction while relatively small, be finally reached promotion slab quality
Effect.
2, in casting process, stable DC stream, size of current are applied to submersed nozzle by DC power supply
It is can be controlled between 2-5A according to the content of aluminate in steel.
3, by means of the present invention, nozzle clogging object thickness can reduce by 12% or more, the unreacted slag line layer in the mouth of a river
140% or more can be promoted；Although the thickness reducing effect of nozzle clogging object is not obvious, from pair of mouth of a river entirety pattern
Than can intuitively see that water outlet own material is essentially by Eroded, but the untreated mouth of a river is corroded seriously.
By the method for the invention, newly-generated mouth of a river surface layer dross physical property matter is more stable and folder while consistency also has certain promotion
The size and number of sundries have obtained different degrees of improvement.
Detailed description of the invention
Fig. 1 aluminum killed steel 10B21 submersed nozzle cross-section comparison；Wherein, (a) compares submersed nozzle, (b) is passed through direct current
The test submersed nozzle of electric current；
Fig. 2 aluminum killed steel 35K submersed nozzle cross-section comparison；Wherein, (a) compares submersed nozzle, (b) is passed through direct current
The test submersed nozzle of stream.
The comparison of Fig. 3 aluminum killed steel 10B21 submersed nozzle microscopic appearance；Wherein, (a) compares submersed nozzle, (b) is passed through
The test submersed nozzle of DC current.
The comparison of Fig. 4 aluminum killed steel 35K submersed nozzle microscopic appearance；Wherein, (a) compares submersed nozzle, (b) is passed through straight
The test submersed nozzle of galvanic electricity stream.
Specific embodiment
A method of applying homophilic charge to inhibit submersed nozzle inner wall dross, the specific operation method is as follows:
Step 1: slotting on the original submersed nozzle surface of aluminium carbonaceous, plain conductor is embedded in submersed nozzle
Portion is sealed with high-temperature cement and refractory cotton, the plain conductor in casting process is prevented to be oxidized；It is extended to outside plain conductor remote
Place is used to connect DC power supply；Plain conductor is pure molybdenum filament, and diameter is in 1mm or more.
Step 2: submersed nozzle being subjected to high-temperature baking before casting, baking time is 2 hours, is formally poured later
Casting process.
Step 3: in casting process, stable DC stream, electric current being applied to submersed nozzle by DC power supply
Size controls between 2-5A according to the content of aluminate in steel；Casting rate controls within 2.1m/min, casting
Temperature is between 1540-1560 DEG C.
Step 4: after the completion of casting, DC power supply being closed.
Embodiment 1
Choosing aluminum killed steel 10B21 is that casting object is tested.Carry out on the conticaster of a machine eight stream Pouring form
Experiment, choose it is wherein first-class submersed nozzle is carried out to apply DC current processing, other being normally poured corresponding thereto
One stream is tested as a comparison.
Before casting, slot treatment is carried out on original aluminum carbonaceous submersed nozzle surface first, later by 1.5mm diameter
Metal molybdenum conducting wire is embedded to inside submersed nozzle, is sealed with high-temperature cement and refractory cotton, is prevented the molybdenum line in casting process
It is oxidized.And outside extends to and is used to connect DC power supply at a distance.After to be sealed, the high temperature before the mouth of a river is cast is pre-
Heat baking, baking time are 2 hours.It is formally cast after to be baked, in casting process, is sent out by DC current
Raw device applies stable DC stream to submersed nozzle, and DC amperage is according to aluminate contains in steel in steel
It measures more and controls in 5A or so.Poring rate is 2.0m/min, and cast temperature is 1550 DEG C.After the completion of casting (12 furnaces, about
12 hours), DC power supply is closed, and corresponding conducting wire is removed.Analysis is taken out at the mouth of a river later, and it controls dross
Effect, corresponding mouth of a river dross and original size result of variations are as shown in table 1；The dross object of mouth of a river innermost layer is as shown in Figure 1.
/ mm is compared in 1 mouth of a river dross of table and original size variation
As it can be seen from table 1 the dross behavior of mouth of a river wall surface and the mouth of a river itself obtain after DC current is protected
Protection.The surface layer dross thickness of 10B21 and intermediate dross thickness degree reduce 13% and 48.45% respectively, and overall dross is thick
Degree reduces 38.10%, and mouth of a river unreacted layer and mouth of a river original layers improve 231.12% and 24.02%.
And it utilizes under OLYMPUS-DSX500 metallographic microscope to using the folder under same field before and after DC current technology
Sundries statistics discovery, after DC current is handled, large-sized field trash has obtained apparent refinement and reduction.Surpass in slab
Crossing 10 μm of large-sized inclusions quantity reductions has been more than 50%.And in mouth of a river avris due to can more early be solidified, in turn
The large-sized field trash for making edge form over 10 μm is extremely difficult.
Embodiment 2
Choosing aluminum killed steel SWRCH35K is that casting object is tested.It is opened on the conticaster of a machine eight stream Pouring form
Exhibition experiment chooses wherein one stream and carries out applying DC current processing, in addition normal casting corresponding thereto to submersed nozzle
One stream test as a comparison.
Before casting, slot treatment is carried out on original aluminum carbonaceous submersed nozzle surface first, later by 1.5mm diameter
Metal molybdenum conducting wire is embedded to inside submersed nozzle, is sealed with high-temperature cement and refractory cotton, is prevented the molybdenum line in casting process
It is oxidized.And outside extends to and is used to connect DC power supply at a distance.After to be sealed, the high temperature before the mouth of a river is cast is pre-
Heat baking, baking time are 2 hours.It is formally cast after to be baked, in casting process, is sent out by DC current
Raw device applies stable DC stream to submersed nozzle, and DC amperage is controlled in 3A or so.Poring rate is 2.0m/
Min, cast temperature are 1550 DEG C.After the completion of casting (10 furnaces, about 10 hours), DC power supply is closed, and to leading accordingly
Line is removed.Its effect for controlling dross of analysis, corresponding mouth of a river dross and original size variation knot are taken out into the mouth of a river later
Fruit is as shown in table 2；The dross object of mouth of a river innermost layer is as shown in Figure 2.
/ mm is compared in 2 mouth of a river dross of table and original size variation
From table 2 it can be seen that the dross behavior of mouth of a river wall surface and the mouth of a river itself obtain after DC current is protected
Protection.The surface layer dross thickness of SWRCH35K, intermediate dross thickness degree and mouth of a river bottom dross thickness degree reduce respectively
27.66%, 5.51% and 37.77%, mouth of a river inner wall totality dross thickness reduces 12.79%, and mouth of a river unreacted layer and water
Mouth original layers improve 141.07% and 30.00%.
And it utilizes under OLYMPUS-DSX500 metallographic microscope to using the folder under same field before and after DC current technology
Sundries statistics discovery, after DC current is handled, field trash overall quantity while the amount of inclusions integrally tends towards stability
Sharp fall is obtained.Steel inclusion reduces amplitude up to 85.33%.And in mouth of a river avris due to can more early be coagulated
Gu and then the large-sized field trash for making edge form over 10 μm is extremely difficult.
Claims (6)
1. a kind of apply homophilic charge to inhibit the method for submersed nozzle inner wall dross, which is characterized in that in submersed nozzle
Inner wall applies a stable forward current, limits field trash with adherency behavior in the sintering of submersed nozzle inner wall, into
And inhibit nozzle clogging, while the amount of inclusions in steel is improved.
2. the homophilic charge according to claim 1 that applies is to inhibit the method for submersed nozzle inner wall dross, feature exists
In specific steps are as follows: groove is opened up on the original submersed nozzle surface of aluminium carbonaceous, plain conductor is put into the groove,
The groove is sealed with high-temperature cement and refractory cotton；The recess width in 2-3cm, end that the plain conductor exposes with
DC power supply connection.
3. the homophilic charge according to claim 2 that applies is to inhibit the method for submersed nozzle inner wall dross, feature exists
In the plain conductor is steel wire, molybdenum filament or tungsten wire, has certain heat-resisting ability.
4. the homophilic charge according to claim 3 that applies is to inhibit the method for submersed nozzle inner wall dross, feature exists
In the plain conductor is pure molybdenum filament, a diameter of 0.8-1.5mm.
5. the homophilic charge according to claim 2 that applies is to inhibit the method for submersed nozzle inner wall dross, feature exists
In before casting, by submersed nozzle progress high temperature preheating baking, baking time is 2 hours.
6. the homophilic charge according to claim 2 that applies is to inhibit the method for submersed nozzle inner wall dross, feature exists
In the current control of the DC power supply is between 2-5A, and casting rate controls within 2.1m/min, and cast temperature exists
Between 1540-1560 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910205858.4A CN109732072B (en) | 2019-03-19 | 2019-03-19 | Method for applying same-polarity charges to inhibit inner wall accretion of submerged nozzle |
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|---|---|---|---|
| CN201910205858.4A CN109732072B (en) | 2019-03-19 | 2019-03-19 | Method for applying same-polarity charges to inhibit inner wall accretion of submerged nozzle |
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| CN109732072B CN109732072B (en) | 2021-05-25 |
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Cited By (2)
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| CN112658241A (en) * | 2020-12-10 | 2021-04-16 | 东北大学 | Method for preventing decarburization and reaction behavior of rare earth steel nozzle by applying interface electric field |
| CN115717210A (en) * | 2022-11-08 | 2023-02-28 | 北京科技大学 | Method for inhibiting titanium-containing steel fish formation phenomenon by using pulse current |
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| CN115717210A (en) * | 2022-11-08 | 2023-02-28 | 北京科技大学 | Method for inhibiting titanium-containing steel fish formation phenomenon by using pulse current |
| CN115717210B (en) * | 2022-11-08 | 2023-11-24 | 北京科技大学 | Method for inhibiting titanium-containing steel-bonded fish phenomenon by using pulse current |
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| CN109732072B (en) | 2021-05-25 |
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