CN109759573A - A method of using pulse current to inhibit submersed nozzle inner wall dross - Google Patents
A method of using pulse current to inhibit submersed nozzle inner wall dross Download PDFInfo
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- CN109759573A CN109759573A CN201910205847.6A CN201910205847A CN109759573A CN 109759573 A CN109759573 A CN 109759573A CN 201910205847 A CN201910205847 A CN 201910205847A CN 109759573 A CN109759573 A CN 109759573A
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- submersed nozzle
- pulse current
- dross
- river
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Abstract
The invention belongs to metallurgical casting fields, and in particular to a method of using pulse current to inhibit submersed nozzle inner wall dross.Technical scheme is as follows: a method of using pulse current to inhibit submersed nozzle inner wall dross, by applying pulse current to submersed nozzle, to inhibit submersed nozzle inner wall dross and protect submersed nozzle.The method provided by the invention for inhibiting submersed nozzle inner wall dross using pulse current, is able to solve submersed nozzle dross problem.
Description
Technical field
The invention belongs to metallurgical casting fields, and in particular to a kind of to utilize pulse current to inhibit submersed nozzle inner wall knot
The method of tumor.
Background technique
Steel itself cleanliness and steel product quality and performance are closely related, each at present in order to promote molten steel itself cleanliness
A metallurgical technology link can carry out corresponding purification and protection to the cleanliness of molten steel.Submersed nozzle is as connection tundish
Critical function type refractory material between crystallizer will not only bear swiftly flowing molten steel in continuous casting production process
It constantly washes away, also suffers the adherency of steel inclusion and the erosion process of some molten slags.Therefore submersed nozzle
Self performance is excellent and the adaptability of operating condition directly influences the production efficiency and slab quality of entire continuous casting process.At present
The submersed nozzle used usually requires that its thermal shock resistance with higher also needs to have both extremely strong anti-slag and invades and antiscour energy
Power, with prevent molten steel generated in casting process bleed-out or blocking phenomena such as.
But in aluminum killed steel production process, since the aluminate content phase in steel can be made using aluminium deoxidation technique
To more.In continuous casting production process, adherency occurs easily between submersed nozzle inner wall and mouth of a river internal material and reacts row
For, and then form nozzle clogging.And the formation of nozzle clogging can not only seriously affect biography of the molten steel from tundish into crystallizer
Defeated process, and as the generation of dross object also will cause the molten steel flow disorder inside crystallizer, even cause the mouth of a river stifled
Plug problem, and then seriously affect the slab quality after continuous casting.
For the dross and blockage problem in submersed nozzle casting process, most of ameliorative way is by blowing at present
Ar protection changes mouth of a river shape, calcification processing and adds slag line containing zirconium etc. to change material etc. to improve nozzle clogging and blocking now
As.But when alumina content is excessively high in steel, the above method then opposite can also weaken the control effect of nozzle clogging.Therefore it explores
The submersed nozzle anti-clogging technology new with one kind is developed is to solve the necessary work of aluminum killed steel nozzle clogging.
In recent years, R&D team where inventor finds in probing into submersed nozzle process of nodulation, swiftly flowing steel
Liquid and field trash can generate stable Interface electric field during quickly flowing in the mouth of a river, and be demonstrated with this in field trash
During flowing through the mouth of a river at a high speed, inclusion particle can have a moment and be charged by friction and adhere in mouth of a river wall surface, and then lead
Cause the behavior of nozzle clogging.
Summary of the invention
The present invention provides a kind of method for inhibiting submersed nozzle inner wall dross using pulse current, is able to solve immersion
Formula nozzle clogging problem.
Technical scheme is as follows:
A method of using pulse current to inhibit submersed nozzle inner wall dross, by applying arteries and veins to submersed nozzle
Electric current is rushed, to inhibit submersed nozzle inner wall dross and protect submersed nozzle.
Further, the method for inhibiting submersed nozzle inner wall dross using pulse current, which is characterized in that
Specific steps are as follows: open up groove on carbon containing original submersed nozzle surface, plain conductor is put into the groove, high temperature is used
Cement and refractory cotton seal the groove；The plain conductor is connect with the pulse power.
Further, the method for inhibiting submersed nozzle inner wall dross using pulse current, which is characterized in that
The submersed nozzle is aluminium carbonaceous submersed nozzle.
Further, the method for inhibiting submersed nozzle inner wall dross using pulse current, which is characterized in that
The groove is spiral groove, opens up depth and avoids mouth of a river sealer, makes subsequent plain conductor and immersion water
Carbon-containing bed full contact in mouthful；The groove opens up width control in 3mm or less.
Further, the method for inhibiting submersed nozzle inner wall dross using pulse current, which is characterized in that
Putting the plain conductor in the groove into is pure molybdenum filament, a diameter of 1.5-3.0mm；Extension outside submersed nozzle is set
Plain conductor is molybdenum filament or other dystectic wires.
Further, the method for inhibiting submersed nozzle inner wall dross using pulse current, which is characterized in that
Before casting, submersed nozzle is subjected to high-temperature baking.
Further, the method for inhibiting submersed nozzle inner wall dross using pulse current, which is characterized in that
In casting process, the pulse current intensity according in steel aluminate content height and casting rate size into
Row is corresponding to be adjusted, and pulse current strength control is between 15000-35000Hz.
The invention has the benefit that
1, core of the present invention is by that mouth of a river wall surface can be made to generate instantaneous high energy degree after applying pulse current to the mouth of a river
The extra electric field of high current density inhibits aggregation and adherency of the field trash with charge to mouth of a river inner wall by extra electric field
Behavior, and then inhibit reflex action of the adherency dross of mouth of a river inner wall even between field trash and nozzle material, it is finally reached
Improve the effect for even preventing nozzle clogging phenomenon.Compared with other conventional methods, it is not only in that in place of gain of the invention
It is more than the relatively easy convenience of process, and using the present invention not only can effectively control mouth of a river inner wall field trash adherency and
Dross behavior, while the slag line and the mouth of a river of mouth of a river inner wall are protected.Although any suppression technology all cannot be completely eliminated water
Mouth dross, but the consistency and stability of the nozzle clogging object for utilizing the present invention newly-generated are obviously higher than traditional casting side
Method.Therefore the peeling of nozzle clogging and dross can also be played while anti-waterstop port inner wall dross using the present invention
Effective inhibiting effect.
2, compared with the method for other control inclusion sizes and quantity, the method for the present invention is started with from submersed nozzle,
It can also inhibit field trash in the mouth of a river by the high current density for applying the instantaneous high energy degree that pulse current generates to mouth of a river inner wall
Itself contact with each other is collided and reflex action.Reach and changed in combination with the gain effect of the above-mentioned inhibition mouth of a river itself dross
The purpose of kind casting blank foreign matter size.
3, after pouring, by measuring and detection obtains, the mouth of a river can be made to tie by applying pulse current in mouth of a river wall surface
Tumor and dross behavior be improved significantly, and newly-generated dross object consistency is higher, can not only prevent nozzle clogging object
It falls off and is again introduced into molten steel, while the mouth of a river itself also being made also to have obtained good protection.After continuous casting 12 hours, the mouth of a river and
Its slag line is still high-visible.
4, the inclusion size inside slab is significantly reduced；Using the method for the present invention and mouth of a river phase after conventional casting
Than the non-thickness of interlayer of mouth of a river slag line improves 139% or more, and the dross thickness of mouth of a river bottom also reduces 50% or so.
And the large-sized inclusions quantity reduction in slab more than 10 μm has been more than 50%.
Detailed description of the invention
Fig. 1 is innermost layer dross object comparison in the mouth of a river after aluminum killed steel 10B21 casting；Wherein, (a) compares submersed nozzle,
(b) submersed nozzle is tested；
Fig. 2 is innermost layer dross object comparison in the mouth of a river after aluminum killed steel SWRCH35K casting；Wherein, (a) compares immersion water
Mouthful, (b) test submersed nozzle.
Specific embodiment
A method of using pulse current to inhibit submersed nozzle inner wall dross, the specific operation method is as follows:
Step 1: slotting on original submersed nozzle surface, it is spiral groove that groove, which opens up mode, opens up depth
Degree has avoided mouth of a river sealer, makes subsequent metal wire that can be in contact completely with carbon-containing bed in the mouth of a river.It opens up
Width requirement is relatively thin, need to control in 3mm or less.Plain conductor is embedded to inside submersed nozzle, with high-temperature cement and resistance to
Guncotton sealing, prevents the plain conductor in casting process to be oxidized；Plain conductor, which extends to, to be used to connect the pulse power at a distance；Gold
Category conducting wire is pure molybdenum filament, and diameter is in 1.5-3.0mm or so.In the groove for allowing to put into completely, in order to plain conductor
While can releasing completely with submersed nozzle completely, be conducive to block groove.And the underlap outside the mouth of a river
It can continue to continue to use molybdenum filament or be changed to other dystectic plain conductors.
Step 2: submersed nozzle being carried out to conventional high-temperature baking before casting, 900-1100 DEG C of baking temperature, is toasted
Time is 2 hours, completes to ensure that pre-buried conducting wire blocks inside the mouth of a river completely while the conventional mouth of a river preheats.It carries out later just
Formula casting process.
Step 3: in casting process, stable pulse current, pulse being applied to submersed nozzle by the pulse power
Current strength according in steel aluminate content height and casting rate size control 15000-35000Hz it
Between.
Step 4: after the completion of casting, the pulse power 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 application pulsed current annealing is carried out to submersed nozzle, 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 2.5mm 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 the pulse power 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 pulse current
Raw device applies stable pulse current to submersed nozzle, pulse current intensity according to the content of aluminate in steel compared with
It controls in 30000Hz or so more.Poring rate is 2.0m/min, and cast temperature is 1550 DEG C.After the completion of casting (12 furnaces,
About 12 hours).After the completion of casting, the pulse power is closed, and corresponding conducting wire is removed.The mouth of a river is taken out later and is divided
Its effect for controlling dross is analysed, corresponding mouth of a river dross and original size result of variations are as shown in table 1；The dross of mouth of a river innermost layer
Object 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 unreacted layer and original layers at the mouth of a river are protected after pulse current is protected.
The mouth of a river unreacted interlayer of 10B21 improves 139.34% than not applying the non-thickness of interlayer at the mouth of a river of pulse current respectively.And
For nozzle clogging problem, in conjunction with Fig. 1 it can also be seen that due to the nozzle material without pulsed current annealing by constantly with
Adherency dross and reflex action will occur for field trash, be that the protection interlayer at the mouth of a river or even original layers are corroded.Simultaneously because most
The dross object consistency and stability that internal layer is formed are poor, so that dross object falls off after mouth of a river wall surface adheres to a period of time
Or it is directly washed away and takes away by swiftly flowing molten steel.And then mouth of a river actual measurement dross dross thickness is caused to be higher than test stream.
And it utilizes under OLYMPUS-DSX500 metallographic microscope to using the folder under same field before and after pulse-current technique
Sundries statistics discovery, the field trash after pulsed current annealing are reduced to averagely 61.36 by original average 96.66,
The amount of inclusions fall is 36.52%.Large-sized field trash has obtained apparent refinement and reduction simultaneously.More than 10
μm more centre of large-sized inclusions, by after mouth of a river wall surface applies pulse current, the big ruler in slab centre
Very little the amount of inclusions reduction has been more than 60%.
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 application pulsed current annealing to submersed nozzle, in addition normal casting corresponding thereto
One stream test as a comparison.
Before casting, slot treatment is carried out on original aluminum carbonaceous submersed nozzle surface first, later by 2.5mm 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 the pulse power 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 pulse current
Raw device applies stable pulse current to submersed nozzle, and pulse current strength control is in 30000Hz or so.Poring rate is
2.0m/min, cast temperature are 1550 DEG C.After the completion of casting (10 furnaces, about 10 hours), after the completion of casting, by the pulse power
It closes, and corresponding conducting wire is removed.Its effect for controlling dross of analysis, corresponding mouth of a river dross are taken out into the mouth of a river later
And original size result of variations 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 unreacted layer and original layers at the mouth of a river are protected after pulse current is protected.
The mouth of a river unreacted interlayer of SWRCH35K improves 222.22% than not applying the non-thickness of interlayer at the mouth of a river of pulse current respectively,
And bottom dross thickness also reduces 50% or so.And for nozzle clogging problem, in conjunction with Fig. 2 it can also be seen that due to
Adherency dross and reflex action will occur for the nozzle material without pulsed current annealing by continuous and field trash, be the guarantors at the mouth of a river
Retaining clip layer or even original layers are corroded.Simultaneously because the dross object consistency and stability that innermost layer is formed are poor, and then make
Dross object falls off or is directly washed away by swiftly flowing molten steel and take away after mouth of a river wall surface adheres to a period of time.And then cause
It surveys dross dross thickness and is higher than test stream in the mouth of a river.
And it utilizes under OLYMPUS-DSX500 metallographic microscope to using the folder under same field before and after pulse-current technique
Sundries statistics discovery, large-sized field trash obtained apparent refinement, by after mouth of a river wall surface applies pulse current, slab
In more than 10 μm large-sized inclusions quantity reduction be more than 50%.
Claims (7)
1. a kind of method for inhibiting submersed nozzle inner wall dross using pulse current, which is characterized in that by immersion
The mouth of a river applies pulse current, to inhibit submersed nozzle inner wall dross and protect submersed nozzle.
2. the method according to claim 1 for being inhibited submersed nozzle inner wall dross using pulse current, feature are existed
In specific steps are as follows: open up groove on carbon containing original submersed nozzle surface, plain conductor is put into the groove, use
High-temperature cement and refractory cotton seal the groove；The plain conductor is connect with the pulse power.
3. the method according to claim 2 for being inhibited submersed nozzle inner wall dross using pulse current, feature are existed
In the submersed nozzle is aluminium carbonaceous submersed nozzle.
4. the method according to claim 2 for being inhibited submersed nozzle inner wall dross using pulse current, feature are existed
In the groove is spiral groove, opens up depth and avoids mouth of a river sealer, makes subsequent plain conductor and immersion
Carbon-containing bed full contact in the mouth of a river；The groove opens up width control in 3mm or less.
5. the method according to claim 2 for being inhibited submersed nozzle inner wall dross using pulse current, feature are existed
In putting the plain conductor in the groove into is pure molybdenum filament, a diameter of 1.5-3.0mm；It is arranged in outside submersed nozzle
Drawn metal conducting wire is molybdenum filament or other dystectic wires.
6. the method according to claim 2 for being inhibited submersed nozzle inner wall dross using pulse current, feature are existed
In before casting, submersed nozzle is carried out high-temperature baking.
7. the method according to claim 2 for being inhibited submersed nozzle inner wall dross using pulse current, feature are existed
In, in casting process, the pulse current intensity according in steel aluminate content height and casting rate it is big
Small accordingly to be adjusted, pulse current strength control is between 15000-35000Hz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111906266A (en) * | 2020-08-21 | 2020-11-10 | 北京科技大学 | Method for inhibiting rare earth molten steel pouring nozzle from being blocked by pulse current |
| CN112024864A (en) * | 2020-08-25 | 2020-12-04 | 辽宁科技大学 | Method for removing inclusions in tundish steel by using pulse current |
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