CN101176914A - Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion - Google Patents
Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion Download PDFInfo
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 43
- 230000003628 erosive effect Effects 0.000 title claims abstract description 22
- 229910001208 Crucible steel Inorganic materials 0.000 title claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 91
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- 238000005266 casting Methods 0.000 claims description 20
- 230000000903 blocking effect Effects 0.000 claims description 19
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- 239000004411 aluminium Substances 0.000 claims description 8
- 239000011819 refractory material Substances 0.000 claims description 5
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- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 15
- 239000001301 oxygen Substances 0.000 description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 239000000203 mixture Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 239000011575 calcium Substances 0.000 description 8
- 239000010813 municipal solid waste Substances 0.000 description 8
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- 238000006243 chemical reaction Methods 0.000 description 6
- -1 ferriferous oxide Chemical compound 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
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- 238000002844 melting Methods 0.000 description 5
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- 238000007670 refining Methods 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
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- 229910004261 CaF 2 Inorganic materials 0.000 description 1
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 206010058490 Hyperoxia Diseases 0.000 description 1
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- 229930194542 Keto Natural products 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to an anti-block and erosion-reducing method for continuous casting nozzle, which has the advantages that: a DC electric field is applied between an inner wall of the continuous casting nozzle and a plurality of liquid steels; based on the specific situation of the blockage and erosion in the nozzle, the adhesion speed of the oxide in the liquid steels to the inner wall is controlled by changing the polarities of the electric field in the inner wall of the nozzle, so as to prevent the blockage and erosion of the nozzle.
Description
Technical field
The present invention relates to a kind of preparation and using method of cast steel stove continuous casting water gap, specifically, the present invention relates to a kind of cast steel stove continuous casting water gap anti-clogging and reduce the method that corrodes.
Background technology
Along with modern industry to improving constantly that steel product quality requires, nearly all steel grade all needs to carry out the external refining of cast steel stove at present, with harmful elements such as nitrogen, hydrogen, oxygen and phosphorus in the further removal steel, sulphur.In order to control the free oxygen content in the steel, generally to add a large amount of deoxygenated alloys in the refining process and carry out deep deoxidation, make it to generate corresponding oxide.Major part in these oxides can be in refining process and molten steel in the stop process of tundish, come-up enters in the slag and is removed from molten steel, but still some can residue in the molten steel with form of oxide inclusions.In the casting process of steel, flow through the mouth of a river when entering crystallizer when molten steel from tundish, these oxide inclusions can adhere at the inwall at the mouth of a river, pile up, and then make nozzle blocking.In addition, the deoxygenated alloy element in the molten steel when molten steel flows through the mouth of a river, also together with from the mouth of a river or molten steel be diffused into the gas reaction of mouth of a river inwall, generate oxide and be deposited on mouth of a river inwall, and quickened the obstruction at the mouth of a river.
It is generally acknowledged that bur presents certain rule at mouth of a river inwall and distributes.At slag line with the upper part, Al
2O
3Bur is less, and the dross thing is mainly the mixture of iron, ferriferous oxide, aluminium oxide.Dross is more serious at the following position of slag line, and particularly the outer wall in the molten steel is immersed near the outlet at the mouth of a river and the mouth of a river, if the dross owner piles up and sintering Al together
2O
3, being mingled with small amounts of iron and ferriferous oxide, aluminium oxide in the dross thing and iron aluminium oxide partly react, and form fine and close compounds such as hercynite.At different tampers, there is the scholar that the submersed nozzle tamper is divided into following a few class.
X type, its tamper are metal.
Because sufficient preheating is not carried out at the mouth of a river, and the molten steel casting temperature is on the low side, aluminium carbonaceous submersed nozzle is because thermal conductivity is big, when molten steel passes through from the mouth of a river, the mouth of a river absorbs the heat in the molten steel, and liquid steel temperature is reduced to below the freezing point very soon, has formed the steel of one deck condensation at mouth of a river inwall, and more and more thicker and even all stop up mouth of a river endoporus, cause to open and water failure.
The Y type, field trash and metal body mix.
Complex phase is mingled with the Z type
Someone during to ANS-OB method refined molten steel continuous casting the nozzle clogging thing study, residual steel position, its center at sample observes that the spherical silicate of part granule is mingled with and granular aluminate is mingled with, it is more at random to distribute, sample limit portion observes network-like field trash in blocks, has granular in dark-coloured collective and the vermiform field trash is separated out.To analysis result granular and the vermiform field trash wherein is aluminium content 100%, is pure Al
2O
3Be mingled with, and network-like to be mingled with dark-coloured collective partly be with Al
2O
3Be that the complex phase that oxides such as main Mg, Si, Ca, Mn, Zr are formed is mingled with the Z type, Al
2O
3Bur.
Other type.
The front mainly is the form of attachment when casting Al killed steel for three kinds, and when the Al killed steel of Ti is added in casting, except that oxide with aluminium oxide is different, all the other are the same with Al killed steel, adhesion layer is to be made of coralloid Ti oxide and the metal that contains Ti oxide grumeleuse in a large number.
Obviously as seen, nozzle blocking is relevant with various factors such as molten steel composition, method of deoxidation, pouring temperature and time, mouth of a river material and shapes.Nozzle blocking with aluminum killed steel, to contain the high steel of aluminium, rare earth steel, Ti-containing steel the most serious.The ore deposit phase composition of tamper mainly is α-Al
2O
3Mixture with FeO.
Nozzle blocking can cause that pulling rate slows down or the flow velocity of molten steel is irregular, causes the continuous casting fluctuation of service; Also can cause bias current simultaneously and cause rolling up slag, tamper comes off to enter and will increase the molten steel field trash in the molten steel, thereby has a strong impact on slab quality, even causes continuous casting interruption accident.Therefore, in order to prevent nozzle blocking, up to the present people have carried out many research.
The anticlogging main method in the mouth of a river of having researched and developed at present has:
The temperature of control molten steel, the heat-insulating property at the reinforcement mouth of a river reduces temperature drop,
The nozzle blocking that molten steel temperature causes when significantly reducing is that the obstruction of this moment is the X type because the solidification phenomenon of steel causes purely.
When continuous casting, molten steel is chilled between middle bag and crystallizer and approaches freezing point, the X type that form this moment and the tamper of Y type, can consider when casting first stove, suitably to improve the temperature of molten steel, ladle, middle bag adopt good adiabatic heat-insulation refractory material, heat loss in the minimizing process, these measures are to being favourable to the submersed nozzle obstruction that improves based on metal.
Cleaning of molten steel
Adopt the oxidation-less casting technology, prevent the secondary oxidation of molten steel, reduce Al
2O
3Generation, improve the degree of purity of molten steel; In ladle, molten steel outgased to handle and to alleviate nozzle blocking.Cleaning of molten steel can reduce Al significantly
2O
3With the contact frequency of mouth of a river inwall, to control Al
2O
3Adhere to the very big effect of having brought into play, the cleaning of molten steel can effectively reduce the field trash in the molten steel simultaneously, improves the quality of steel billet.
Adopt difficult tack material at mouth of a river inwall
The roughness that reduces the mouth of a river inwall during production not have very big effect to nozzle blocking, but when casting the roughness of mouth of a river inwall to Al
2O
3Tamper adhere to the influence that promotion is arranged, should guarantee that therefore the mouth of a river still can keep smooth inner surface when cast, this can significantly reduce the clogging at the mouth of a river.When design, adopt usually to be difficult to by molten steel wetting composition or and Al
2O
3Tamper reactivity, the composition that associativity is little are as BN, ZrB
2, Si
3N
4Deng.
Form low melting point at interface, the mouth of a river
(1) adopts BN-AlN-C, ZrO
2-C-ZrB
2, ZrO
2-SiC-C, CaO-ZrO
2-C and Sialon-C etc., the interior wall liner of these materials and the field trash in the molten steel form easily by the low melt-phase of molten steel scouring, reduce Al thereby reach
2O
3Adhesion.
(2) adopt Ca to handle, make it and deoxidation product Al
2O
3Reaction generates low melting point CaO-Al
2O
3, prevent that aluminium oxide is attached on the submersed nozzle.For example, adopt the CaSi silk to handle molten steel, can make deoxidation products form low-melting compound, thereby prevent that deoxidation products is deposited on mouth of a river inwall.
When molten steel Ca handled, dissolving Ca content was subjected to the influence of O in the molten steel, S content very big in the molten steel, and operational stability is poor when causing molten steel Ca to handle.And the addition that increases Ca simply is worthless, causes the erosion of molten steel to anti-material because of Ca measures too high meeting, may make mouth of a river stopper out of control.In addition, if Al
2O
3The field trash upgrading is insufficient, and calcium is handled and also can be increased the weight of the obstruction at the mouth of a river.
The optimization of gate structure
(1) improves gate structure: the mouth of a river of employing band shape porous plug, the mouth of a river that band is inlayed porous plug, the slit air blowing mouth of a river, the reducing mouth of a river etc.For example, the patent No. discloses a kind of anti-clogging immersion molten steel outlet of ad hoc structure for the Chinese utility model patent of " 00259086.7 ".In addition, change steel flow export angle, also can suppress nozzle blocking effectively according to cast steel grade, poring rate, crystallizer cross dimensions etc.
(1) adopt composite nozzle: promptly, at traditional Al
2O
3Wall liner in the inboard additional one deck anti-clogging in-C mouth of a river.Material commonly used has: ZrO
2-CaO-C is a material, O '-ZrO
2-C is a material, and Sialon-graphite is material, zirconium mullite-CaF
2Be material and Al
2O
3-zirconium mullite-CaO-C is a material etc.
(2) adopt new material: adopt the bigger BN of interfacial tension to substitute part graphite, reduce the wetability of molten steel, reduce oxide inclusions adhering in the steel at mouth of a river inwall to the mouth of a river.
Though said method is widely used and has obtained certain effect, but still there are some problems.Mainly contain:
(1) the easy aquation of CaO composition in the inboard extra play in the mouth of a river: because the easy aquation of CaO composition, therefore, adding the CaO composition generally all is to pass through ZrO
2The form of (+CaO) adds.Because ZrO is advanced in solid solution
2The amount of CaO in the lattice is certain, therefore, passes through ZrO
2The amount of the CaO composition of bringing into is limited, can not play the lasting effect that prevents to nozzle blocking.
(2) gas that is blown into forms casting blank defect easily: be blown into gas in the molten steel by mouth of a river inwall and be easy to form air pocket and be involved in the steel stream, form the casting billet surface defective.
(3) when preventing nozzle blocking, can not suppress the erosion at the mouth of a river: in the middle of each method of above-mentioned mouth of a river anti-clogging, all less than the factor of considering to cause that the mouth of a river is corroded.Particularly when employing contained the inboard extra play in the mouth of a river of CaO composition, because the generation of calcium aluminate low-melting compound is arranged, therefore, it is serious that the mouth of a river is corroded, and influences the service life at the mouth of a river.
According to the present situation of above-mentioned mouth of a river anti-clogging research and the subject matter of existence, further research and develop mouth of a river anti-clogging new technology for the raising slab quality, the potential safety hazard in minimizing and the elimination casting process, it is significant to reduce production costs.
Summary of the invention
At the defective that prior art exists, the inventor finds: utilize the electrolytical operation principle of oxide solid, adopt the method that applies electric field between mouth of a river inwall and molten steel, can suppress nozzle blocking and improve mouth of a river service life by electrochemical principle.Thus, the method that a kind of continous casting sprue anti-clogging and minimizing are corroded has been proposed.
The objective of the invention is to, a kind of cast steel stove continuous casting water gap anti-clogging is provided and reduces the method that corrodes.
Method according to cast steel stove continuous casting water gap anti-clogging of the present invention and minimizing erosion, it is characterized in that, the interior wall liner of described cast steel stove continuous casting water gap is made of conduction refractory, with described continous casting sprue inwall is a utmost point, with molten steel is another utmost point, between cast steel stove continuous casting water gap inwall and molten steel, apply the DC electric field that electric current is 10-300A, by polarity that changes mouth of a river inwall electric field and the size of current of flowing through, control molten steel inner oxide is in the speed of adhering to of mouth of a river inwall, and then prevent nozzle blocking, and reduce the erosive velocity at the mouth of a river.
The oxygen concentration cell that utilizes the electrolytical operation principle assembling of oxide solid among the present invention, that is, Determining oxygen probe is a kind of Direct Determination of Oxygen technology, the operation principle of its Direct Determination of Oxygen technology is as follows:
When solid electrolyte (ZrO for example
2-CaO) place between the different partial, and when connecting metal electrode (as shown in Figure 1), then in the contact position of electrolyte and metal electrode cell reaction will take place.
At the hyperoxia end, electrode reaction is:
O
2(p
02 II)+4e＝2O
2- (1)
4 electronics that 1 oxygen molecule in the gas phase is captured on the electrode become 2 oxonium ions and enter crystal.This electrode loses 4 electronics, thereby positively charged, is anodal.Enter oxonium ion in the crystal under the effect of oxidation degree difference, overcome electric field force, arrive the hypoxemia end by oxygen ion vacancy, concurrent giving birth to stated reaction:
2O
2-＝O
2(p
02 I)+4e (2)
Oxonium ion in the lattice leaves 4 electronics behind and becomes oxygen molecule and enter gas phase.Electrode thereby electronegative is a negative pole herein.Formula (1) and formula (2) sum are the overall reaction of battery.
O
2(p
02 II)＝O
2(p
02 I) (3)
Being equivalent to oxygen moves to the low oxygen partial pressure end from the high keto sectional pressure end.Be accompanied by the migration of oxonium ion, produce electromotive force E at the battery two ends.Obviously, the size of electromotive force is directly related with the partial pressure of oxygen of electrolyte both sides.
Above-mentioned cell reaction is actually a reversible electrochemical reaction process,, if pass through the both positive and negative polarity of the electromotive force at control battery two ends, also can control the migratory direction by the oxygen of crystals that is.
Be preferably, according to the method for cast steel stove continuous casting water gap anti-clogging of the present invention and minimizing erosion, described method is that the mouth of a river (inwall) is connected with positive source, and molten steel is connected with power cathode.
If the mouth of a river (inwall) is connected with the positive pole of power supply, under effect of electric field, can makes the mouth of a river (inwall) low so, and then reduce the sour molten aluminium possibility that (inwall) surface produces oxidation and adheres at the mouth of a river with the oxygen potential drop of molten steel contact interface.In addition, because electrochemical effect, the oxide on the mouth of a river (inwall) surface decomposes stripping, further reduces the possibility of nozzle blocking.
On the contrary, if producing, the mouth of a river (inwall) corrode, the oxygen position of the mouth of a river and molten steel contact interface is raise, promptly, the mouth of a river (inwall) is connected with power cathode, molten steel is connected with positive source, increases the sour molten aluminium possibility that (inwall) surface produces oxidation and adheres at the mouth of a river, and then suppress the melting loss speed of refractory material.Simultaneously, because electrochemical effect, the mouth of a river (inwall) oxide on surface stripping is decomposed, and also can be inhibited.Therefore, the method by between mouth of a river inwall and molten steel, applying electric microfield, can suppress nozzle blocking and improve mouth of a river service life.
In addition, according to cast steel stove continuous casting water gap anti-clogging of the present invention and the method that reduce to corrode, described electric current is during less than 10A, and anti-clogging and reduce the DeGrain that corrodes when being higher than 300A, make troubles for power supply and execute-in-place.
In addition, according to the method for cast steel stove continuous casting water gap anti-clogging of the present invention and minimizing erosion, described current range is at 10-100A.Can further improve the continous casting sprue anti-clogging thus and reduce the effect that corrodes, simultaneously, power supply and execute-in-place are convenient.
Be preferably, according to the method for cast steel stove continuous casting water gap anti-clogging of the present invention and minimizing erosion, described conduction refractory is that a refractoriness is higher than the solidification of molten steel point, conductance is higher than 1 * 10
2The material of S/m.
For example, according to the method for cast steel stove continuous casting water gap anti-clogging of the present invention and minimizing erosion, described conduction refractory is Al
2O
3-C matter, ZrO
2-C matter and MgO-C matter etc. are the main component refractory material with graphite, the TiB that solid electrolyte and electric conductivity are good
2And ZrB
2Deng.
Be preferably, according to the method for cast steel stove continuous casting water gap anti-clogging of the present invention and minimizing erosion, described continous casting sprue itself is made of above-mentioned conduction refractory.
Be preferably, according to cast steel stove continuous casting water gap anti-clogging of the present invention and the method that reduce to corrode, described method is specially adapted to the continuous casting mouth that sour molten aluminium is higher than 0.003% deep deoxidation steel.
Be preferably, the method according to cast steel stove continuous casting water gap anti-clogging of the present invention and minimizing erosion produces when corroding at the mouth of a river, and the mouth of a river (inwall) is connected with power cathode, and molten steel is connected with positive source.
The simple declaration of accompanying drawing
Figure 1 shows that the fundamental diagram of solid electrolyte oxygen concentration cell.
Figure 2 shows that between mouth of a river inwall and molten steel and apply electric microfield.
Figure 3 shows that the embodiment key diagram.
Among the figure, 1 is molten steel (liquid), and 2 is tundish, 3 for insert tundish and with the molten steel electrodes in contact, 4 is another electrode of inserting the mouth of a river and contacting with mouth of a river inwall, 5 is power supply, and 6 is the mouth of a river, and 7 is slide plate, 8 is crystallizer, 9 is interior wall liner, and electrode 3 inserts tundish and contacts with molten steel, and 4 at another root electrode is inserted the mouth of a river and contacted with mouth of a river inwall.Connect with power supply 5 by lead between two electrodes.
The specific embodiment
Below, in conjunction with the accompanying drawings, specify the present invention.
Embodiment 1-3, embodiment 5
Use a kind of cast steel stove continuous casting water gap, the pour steel composition is: C 0.0030-0.35%, Si 0.01-0.45%, Mn 0.2-1.2%, P 0.006-0.02%, S 0.001-0.030%.Strand is slab, circle base and sheet billet.
Shown in Fig. 1-2, be a utmost point with the cast steel stove continuous casting water gap inwall, be another utmost point with molten steel, by changing mouth of a river inwall electric polarity and size of current, control molten steel inner oxide is in the speed of adhering to of mouth of a river inwall.
Wall liner is MgO or MgO-CaO matter coating in the tundish, and the interior wall liner of described continous casting sprue is made of conduction refractory.The interior wall liner of described continous casting sprue is Al
2O
3-C matter and internal layer are lined with ZrO
2Al
2O
3-ZrO
2-C fire resistant materials, slide plate are Al
2O
3-C fire resistant materials.
In the present embodiment, electrode used therein is Al
2O
3The high-melting-point conductive materials of-C, MgO-C, Mo and other kinds.
As shown in Figure 3.Molten steel in the tundish 2 flows into crystallizer 8 by slide plate 7 its flows of control and via the mouth of a river 6.Electrode 3 inserts tundish and contacts with molten steel, and 4 at another root electrode is inserted the mouth of a river and contacted with mouth of a river inwall.Connect with power supply 5 by lead between two electrodes.Like this, between electrode, power supply, molten steel and the mouth of a river, just formed a circuit.
Under the described experiment condition of table 1, use above-mentioned continous casting sprue, to the pour steel composition be: C0.0030-0.35%, Si 0.01-0.45%, Mn 0.2-1.2%, P 0.006-0.02%, S 0.001-0.030%, strand are that slab, circle base and sheet billet carry out the continuous casting operation.It the results are shown in table 1.
Except the present embodiment embodiment behind the electric field both positive and negative polarity for a change, that is, the mouth of a river (inwall) is connected with power cathode, with outside molten steel and anodal the connection, other carry out continuous casting and operate as embodiment 1-3 and embodiment 5.
Under effect of electric field, the oxygen potential drop of the mouth of a river and molten steel contact interface is low, and then (inwall) surface produces oxidation and adheres at the mouth of a river to reduce sour molten aluminium.In addition, because electrochemical effect, the oxide on the mouth of a river (inwall) surface will produce stripping and decompose, and further reduce nozzle blocking.Its result is described as table 1.
Table 1
Comparative example 1-2
Except different electricity, other carry out the continuous casting operation as embodiment 1.It the results are shown in table 2.
Table 2
Embodiment 6-10
Except described continous casting sprue itself was made of above-mentioned conduction refractory, other carried out the continuous casting operation as embodiment 1-5.Its result is described as the embodiment 1-5 in the table 1.
The evaluation of the result of the test shown in the table 1 is carried out as follows.
Evaluation about nozzle blocking:
Do not stop up, stablize the steel-passing amount of cast estimates by every mouth of a river.
Excellent: steel-passing amount is not more than 500 tons, stop up,
Very: steel-passing amount is not more than 400 tons, stop up,
Can: steel-passing amount is not more than 300 tons, stop up,
Bad: the anti-clogging effect is not remarkable, and steel-passing amount does not reach 300 tons.
Evaluation about mouth of a river erosion-resisting characteristics:
Estimate by mouth of a river section depth of erosion.
Excellent: depth of erosion is less than 5mm,
Very: depth of erosion is greater than 5mm, less than 20mm,
Can: depth of erosion is greater than 20mm.
Evaluation about slab quality:
For slab, adopt rolling back steel plate to estimate because of being mingled with the ratio of defects that causes;
For the circle base, the inclusion defects rate in the goods that the employing ultrasonic listening is come out is estimated;
For sheet billet, adopt the inclusion defects rate in the goods that ultrasonic listening comes out to estimate equally.
For slab:
Excellent: less than 1.0%,
Very: less than 2.0%,
Can: less than 5.0%.
For justifying base and sheet billet:
Excellent: less than 0.2%,
Very: less than 0.5,
Can: less than 1.0%.
As seen from Table 1, the embodiment of embodiment 1-3 for switching under the claim condition of the present invention, mouth of a river performance of anti-blockage obviously improves, and strand is good, particularly when electrical current during at 50-100A, better effects if.
Comparative example 1 and comparative example 2 be not for there being the comparative example of energising, and with embodiment 1-5, embodiment 6-10 compares, and the performance of anti-blockage and the slab quality at the mouth of a river obviously descend.
According to the present invention, utilize the electrolytical operation principle of oxide solid, adopt the method between mouth of a river inwall and molten steel, apply electric field, can suppress nozzle blocking and improve mouth of a river service life by electrochemical principle.
Claims (11)
1. a cast steel stove continuous casting water gap anti-clogging and reduce the method that corrodes, it is characterized in that, the interior wall liner of described cast steel stove continuous casting water gap is made of conduction refractory, with described continous casting sprue inwall is a utmost point, with molten steel is another utmost point, between cast steel stove continuous casting water gap inwall and molten steel, apply the DC electric field that electric current is 10-300A, by changing mouth of a river inwall electric polarity and size of current, control molten steel inner oxide is in the speed of adhering to of mouth of a river inwall, prevent nozzle blocking thus, and reduce the erosive velocity at the mouth of a river.
2. the method that cast steel stove continuous casting water gap anti-clogging as claimed in claim 1 and minimizing are corroded, described method are that the mouth of a river is connected with positive source, and molten steel is connected with power cathode.
3. the method that cast steel stove continuous casting water gap anti-clogging as claimed in claim 1 and minimizing are corroded is characterized in that described electric current is in the 10-100A scope.
4. the method that cast steel stove continuous casting water gap anti-clogging as claimed in claim 1 and minimizing are corroded is characterized in that described continous casting sprue itself is made of above-mentioned conduction refractory.
5. as the method for claim 1 or 4 described cast steel stove continuous casting water gap anti-cloggings and minimizing erosion, it is characterized in that described conduction refractory is that a refractoriness is higher than the solidification of molten steel point, conductance is higher than 1 * 10
2The material of S/m.
6. as claim 1 or 4 described cast steel stove continuous casting water gap anti-cloggings with reduce the method that corrodes, it is characterized in that described conduction refractory is for being the refractory material of main component with graphite.
7. the method that cast steel stove continuous casting water gap anti-clogging as claimed in claim 6 and minimizing are corroded is characterized in that described conduction refractory is for being selected from Al
2O
3-C matter, ZrO
2-C matter, MgO-C matter are the refractory material of main component.
8. as the method for claim 1 or 4 described cast steel stove continuous casting water gap anti-cloggings and minimizing erosion, it is characterized in that described conduction refractory is a solid electrolyte.
9. as the method for claim 1 or 4 described cast steel stove continuous casting water gap anti-cloggings and minimizing erosion, it is characterized in that described conduction refractory is the good TiB of electric conductivity
2Or ZrB
2
10. cast steel stove continuous casting water gap anti-clogging as claimed in claim 1 and the method that reduce to corrode is characterized in that, described method is used for the continuous casting mouth that sour molten aluminium is higher than 0.003% deep deoxidation steel.
11. cast steel stove continuous casting water gap anti-clogging as claimed in claim 1 and the method that reduces erosion produce when corroding at the mouth of a river, described method is that the mouth of a river is connected with power cathode, and molten steel is connected with positive source.
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