CN201023130Y - Device for continuous metal casting - Google Patents
Device for continuous metal casting Download PDFInfo
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- CN201023130Y CN201023130Y CNU2006201534204U CN200620153420U CN201023130Y CN 201023130 Y CN201023130 Y CN 201023130Y CN U2006201534204 U CNU2006201534204 U CN U2006201534204U CN 200620153420 U CN200620153420 U CN 200620153420U CN 201023130 Y CN201023130 Y CN 201023130Y
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Abstract
The utility model belongs to a metallurgical technology field, which relates to a metal continuous-casting apparatus. The utility model can not only be used for continuous casting billet, but also be used for denaturation treatment in fluent metal alloy smelting. The utility model comprises an unwinding machine, a hauling machine, a clipping machine, a guide tube, a vibrator, an intermediate molten steel tank, and a crystallizer. A steel belt sequentially passes through the unwinding machine, the flattening hauling machine, the guide tube, the vibrator, and the crystallizer, at least one consumptive cool steel column which has similar chemical composition with the casting metal is delivered into the crystallizer. The fluent metal molten steel tank is installed above the crystallizer, or connected with the crystallizer via a submersible water opening. The vibrator is a non-contact electromagnetic vibrator, the vibration of which is generated by an electromagnet. The consumptive cool steel column is forced to be resonantly vibrated by the vibrator, and the flattening hauling machine is at least provided with two pairs of drive rollers and a suit of control elements. The utility model realizes uniform cooling for casting metal, and improves quality of metal and alloy continuous casting billet.
Description
Technical field:
The utility model belongs to metallurgical technology field, relates to a kind of device that is used for continuous casting of metal.Also can be used for continuous casting billet, also can be used for the degenerative treatments that liquid metal alloy is smelted.
Background technology:
The continuous pouring of countries in the world steel facts have proved, continuous casting billet a kind of typically also is one of defective of the most difficult elimination, is axial chemical inhomogeneity.And this defective is inevitable.In order to reduce the influence of this defective to continuous casting billet quality, a lot of ways have been adopted in countries in the world.US3726331, US4047556, Russian Patent No.2809672/22-02 discloses some and has helped to improve the technological measure of metal and alloy continuous casting billet quality, be in metal bath, to add various solid-state consumable cold material, it is doubly a lot of that its length surpasses maximum transverse size, as bar, wire rod or band.The method that these are known and the device of enforcement can not guarantee stably to improve the quality of continuous casting billet.This is can consume cold material only to the feeding direction motion because institute adds, and can not form interactive facilitation with molten metal.Consequently, can consume fusing of cold material and blending process difficulty increases greatly, time lengthening, because can consume cold material and just entered molten metal the time, metal, bits and the nonmetal inclusion of one deck bath surface at first solidified on its surface, just can be heated and melt then.Bits and non-metallic inclusion enter the melt depths thereupon, become the new pollution sources of continuous casting ingot and continuous casting billet.Adopt such device, can consume cold material skewness in molten metal, caused the structural heterogenity of continuous casting ingot and continuous casting billet.
Ukraine patent No.40053A discloses a kind of known metal continuous cast crystallization apparatus, comprises crystallizer, sends into the parts of molten metal to crystallizer, and adding can consume the parts of cold material and to consuming the parts that cold material transmits pulse.The pulse transferring elements is made into the form of discharge tank, to consuming the cold material transmission electric hydaulic shock pulse identical with its direction of motion.This known devices can not obviously guarantee the quality of continuous casting billet, the institutional framework of improving continuous casting billet that most importantly can not be stable.This is because in the mass exchange that does not reach sufficient intensity between cold material and the molten metal in the time can consuming the cold material transmission electric hydaulic pulse identical with its direction.Because it is quite long to consume cold material length, so in fact this vibrational energy is not delivered in the melt, in fact, vibrational energy is all absorbed by cold material basically, particularly loses flexible the time at cold material.Consequently, in crystallizer (groove) metal meniscus region, cold material surface be can consume and knot layer of metal, bits and non-metallic inclusion are stained with, cold material burn-off rate has slowed down, cause cold material material to disperse inhomogeneous at melt, ingot (base) tissue odds is even, has increased the weight of the dustiness of metal the inside nonmetal inclusion.
With regard to technology essence, Japan Patent No.56-4133 discloses immediate a kind of device that adds fill-in to molten metal, comprise liquid metal vessels, consuming the equipment that cold material adds molten metal (by reel and tractive structure and cause the equipment of the mandatory vibration of cold material to be formed).The forced vibration device is a ultrasonic vibration source, has a hole cooling material that runs through to pass through in its radiator, and cold material is accepted ultrasonic vibration by sliding contact from vibration source.This device also has a series of deficiencies.The ultrasonic vibration that this device uses can make cold material reach the amplitude (even when sliding contact is quite tight) of 5-12 μ m.Such amplitude can not transmit the necessary energy of molten metal on a large scale.Propagate to both direction because pass to the vibrational energy of cold material, both to the direction of metal to be treated, also in the opposite direction, so the inefficiency of this device.In addition, vibration source can not provide reliable acoustics to contact with sliding-contact point between the cold material, and this causes losing in a large number of vibrational energy equally.So, use this sampling device continuous casting steel machine and attempt to improve the effect that the institutional framework of steel ingot (steel billet) does not also have.When cold material with little vibrational energy (little amplitude) when entering into melt, its surface can condensation metal, bits, and its fusion process is obviously spun out, effect is bad.Inhomogeneous in a organized way district in the continuous casting, and nonmetal inclusion pollution grows worse district.The reason of the existing segregation process of structural heterogenity also has and does not melt the residual reason of cold material.
Summary of the invention:
Crystallization apparatus when the utility model is intended to improve metal continuous cast reduces structural heterogenity to improve the quality of continuous casting ingot (base).A kind of device that is used for continuous casting of metal is provided.
The technical solution of the utility model is as follows: in the metal continuous cast crystallization apparatus, comprise crystallizer (groove), infeed the parts of molten metal to crystallizer (groove), transmitting the mechanism assembly that can consume cold material to crystallization tank (comprises and can consume cold material volume, rotating drum, the aligning structure, the minimum tractive structure that has two pairs of driven rollers and a cover control piece) can consume the humorous vibration source of pressure of cold material, and the conticaster tractive machinery of band Control Component.Can consume cold material is similar cold line material of chemical composition and institute's ingot metal or cold belt material.Liquid metal is sent constantly into crystallizer, and constantly pulling out from crystallizer can be for the semifinished product of next step processing.Simultaneously, to crystallizer send at least one chemical composition and institute's ingot metal similar consume cold material.By the effect of electromagnet, give cold material with mandatory resonance, its amplitude, frequency and wavelength then depend on the physical-chemical parameters of institute's continuous casting of metals and the process conditions of casting process.Principle of the present utility model is as follows:
-to force humorous vibration source be a contactless electromagnetic vibrator, and ∏ font hole slot is arranged on horizontal plane, before contactless electromagnetic vibrator and after guide roller all is housed.Distance between guide roller axis and the contactless electromagnetic vibrator axis is determined by following relational expression:
L1=n λ/2 and L2=(2n1) λ/4 (1)
In the formula: L1 is that contactless electromagnetic vibrator axis is to leading distance between roll axis, mm;
L2 is that contactless electromagnetic vibrator axis is to the distance between the guide roller axis of back, mm;
N is 1, any integer between 2......K;
λ is for consuming the wavelength of the mandatory resonance wave of cold material, mm;
The gap of the ∏ font hole slot of-contactless electromagnetic vibrator horizontal plane can be regulated in (2-15) δ scope, and δ is a cold material thickness (diameter) in the formula, mm;
The tractive structure running roller axis of the cold material of-transmission is pressed following formula to the distance (L3) between contactless electromagnetic vibrator axis and is determined:
L3＝(2n1)λ/4
In the formula n be 1, any integer among the 2......K;
λ is for consuming the wavelength of cold material resonance wave, mm;
-feed material machine tractive Mechanical Driven control piece to link to each other with conticaster tractive Mechanical Driven control piece, can regulate the unit consumption of cold material automatically.Just use feedback technique commonly used feedback device is installed.
Force humorous vibration source to constitute by contactless electromagnetic vibrator, and ∏ font hole slot arranged on horizontal plane, this has just guaranteed to consume cold material and has had the stable resonance that amplitude is not less than 1.0mm, and therefore by cold material powerful vibrational energy is transported in the molten metal, this has just greatly accelerated the mass exchange between cold material and the molten metal.
Contactless electromagnetic vibrator is equipped with control piece, and it can wait according to the physical-chemical parameters and the quantity of molten metal, the temperature conditions that can consume cold material transfer rate, process and change cold material and force the resonance wave amplitude.
The forced vibration source is at the forward and backward guide roller that all assembled of contactless electromagnetic vibrator.The guide roller axis is determined by formula (1) to the distance between contactless vibration axis:
Evidence, guide roller is arranged in apart from the distance of its axis n λ/2 times upward before the contactless electromagnetic vibrator, can stop the opposite direction transmission of vibrational energy to melt.As a result, the vibrational energy that passes to cold material can fully be delivered in the molten metal basically, like this, has strengthened the usefulness of this device in fact.If the distance that guide roller is settled does not meet the requirement of this relational expression, will the disperse vibration energy, thus reduce vibrational energy and cold material for the impact effect of molten metal, this device working condition is degenerated on the whole.
Guide roller is arranged in the distance of its axis (2n1) λ/4 times of relations upward behind the contactless electromagnetic vibrator, can guarantee that vibrational energy is delivered in institute's ingot metal liquid without barrier.If the guide roller mounting distance does not meet this requirement, can make the decay and the dispersion of the vibrational energy part of transmitting to molten metal, thereby reduce the operating efficiency of this device greatly, be difficult to produce the cast metals (base) of necessary quality.
Evidence, the hole slot of contactless vibrator horizontal plane is the ∏ font, and (δ is cold material thickness or diameter in the formula, mm), can guarantee to consume the amplitude and the frequency values of cold material necessity can to regulate the gap in (2-15) δ scope.The little electromagnetic vibrator that can not guarantee in gap is worked stably, and can cause noise effect.Then can lose the amplitude that induction reduces cold material in a large number when the slit is big because of electromagnetic vibrator.
Evidence, the tractive structure running roller of cold material feeding machine become (2n1) λ/4 times of relations with the mounting distance of contactless electromagnetic vibrator axis, can guarantee the work of tractive Stability Analysis of Structures ground.Under this distance, the remained shock (if any) that can consume cold material can not be delivered on the running roller of draw-off mechanism, can not reduce the operating efficiency of running roller yet.This will guarantee that this device can work reposefully, reposefully cold material will be delivered in the crystallizer (groove), and produce high-quality continuous casting ingot (base).
Cold material feeding machine tractive Mechanical Driven control piece and conticaster tractive Mechanical Driven control piece connect together, and have guaranteed to regulate automatically according to the linear velocity of metal continuous cast the possibility of cold material rate of feeding, and this has just guaranteed by required quantity feed.
Cold material consumption optimum value and be sent to the vibration efficiency optimum value of melt through cold material has guaranteed that the mass exchange situation is obviously improved between cold material and the melt, has guaranteed the reduction of thermograde in melt temperature and the melt.This causes forming equiaxed crystal in melt, and the segregation situation is disperseed, and has enlarged axial equiax crystal band, has correspondingly reduced the segregation of whole axle center, has guaranteed to produce the ingot casting (base) of homogeneous tissue.
Implement in the utility model patent casting apparatus: from middle molten steel jar 7 liquid metal 8 is delivered to the crystallizer (groove) 10 by immersed nozzle 9, start the machinery combination that transmits cold material to crystallizer (groove) simultaneously, this assembly comprises steel band (line) 2 and uncoiling machine 1 and aligning hauling machine 3.
Can consume cold material is band or wire rod, makes by learning the close material of composition with the liquefaction of institute ingot metal.
Steel band (line) 2 withdraws from from uncoiling machine 1, passes the aligning draw-off mechanism and sends into contactless electromagnetic vibrator 6 along guide pipe 5, and guide pipe 5 front ends below is provided with cutter 4.
When being endowed during through contactless electromagnetic vibrator 6 ∏ font grooves, steel band (line) 2 have regulation to shake frequently and the vibration of amplitude.Because contactless electromagnetic vibrator 6 has guaranteed the resonance of steel band (line) 2, thus at it with before liquid metal 8 contacts, keeping the frequency and the amplitude that vibrate always.
Driving control piece and the conticaster tractive Mechanical Driven control piece of aligning hauling machine 3 connect together, and the delivery rate that has guaranteed to consume cold material can be according to the linear velocity of casting of metals and adjusting automatically.
Contactless electromagnetic vibrator is equipped with before electromagnet 13 electromagnet deflector roll 14 behind the deflector roll 11 and electromagnet.Before the preceding deflector roll 11 backing roll 12 is housed.
Distance (L1) from the preceding guide roller of electromagnet (13) (11) axis to the electromagnet axis is determined by following relational expression:
L1＝nλ/2(a)
In the formula: any integer of n-,
λ-can consume the wavelength of cold material vibration wave, mm.
Under this numerical value of L1, the peak swing of cold material is corresponding with deflector roll 11 axis before the electromagnet, and this has just absorbed the vibration opposite with the melt direction.Therefore, most vibrational energies pass to the molten metal direction.
The axis of electromagnet 13 back deflector rolls 14 to the distance (L2) of electromagnet axis is determined by following relational expression:
L2＝(2n1)λ/4(b)
In the formula: any integer of n-,
The wavelength of λ-cold material vibration wave, mm.
Under this numerical value of L2, the minimum amplitude of cold material (near 0) is corresponding with the axis of back guide roller 14.The result makes the vibration that can consume cold material be delivered to the direction of institute's ingot metal without barrier, has guaranteed the maximum efficiency of cold material and molten metal and effect.
Evidence, the adjustable gaps of contactless electromagnetic vibrator horizontal plane ∏ font hole slot, adjustable range (2-15) δ [δ is the thickness (diameter) of cold material in the formula, mm] can guarantee to consume required amplitude and the frequency values of cold material vibration.The little electromagnetic vibrator that can not guarantee in gap is worked evenly, and can cause big noise effect.Can lose in a large number because of induction in the electromagnetic vibrator when gap is big seriously decays the amplitude that can consume cold material.
Fig. 1 has indicated the running roller of at least two pairs of cold material draw-off mechanisms of contactless relatively electromagnetic vibrator axis configuration.The distance L 3 that indicates should be determined by following formula:
L3＝(2n1)λ/4(c)
In the formula: any integer of n-,
λ-cold material vibration wavelength, mm.
Under this numerical value of L3, on the running roller of the remained shock of cold material biography less than tractive machinery, can not reduce operating efficiency yet.
All these have guaranteed that all this device stably works, and stably transmit to crystallizer (groove) and can consume cold material, and then produce high-quality continuous casting ingot.
In the utility model, by the even cooling of casting metals, the thermograde in the melt in the crystallization process is obviously reduced, this itself has just guaranteed the segregation that ingot (base) lining disperses uniformly, obviously reduced the axle center segregation, continuous casting ingot (base) has obtained on the whole than the uniform tissue structure.When cold material enters molten metal, avoided the condensation in its surface of metal and bits, greatly accelerated cold material fusing and blending process, thereby reached the target that casting metals is evenly cooled off.Be widely used in the casting of steel, iron, alloy type metal.
Description of drawings:
Fig. 1 is a metal continuous cast method equipment therefor system diagram
Fig. 2 is contactless electromagnetic vibrator structural representation
The specific embodiment:
Embodiment 1:
Continuous casting steel uses, steel carbon containing 0.40%, casting speed 0.43-0.44m/min.
In the casting process, constantly transmit and to consume cold material (steel band, cross section 3*80mm), give and send speed 4.1m/min, sent speed to calculate, steel band carbon content 0.35% according to casting speed to crystallizer (groove) (diameter of phi 530mm).Utilize contactless electromagnetic vibrator to excite the resonance that can consume cold material, resonant frequency 95-100HZ, wavelength 540mm, amplitude 4.0-5.0mm.
In this instantiation, distance L 1-270mm (n=1), L2-135mm (n=1), L3-2295mm (n=9).
∏ font hole slot width 30mm in the electromagnetic vibrator is 10 times of cold thickness of strips.
The fusing fully of using this continuous casting process to guarantee to consume cold steel band, the organization that has improved the continuous casting ingot;
The segregation of-axle center drops to the 1.0-1.5 level from 3.0 grades,
-center equiax crystal band increases to 40-45% from ingot casting cross section 15-20%, has reached the target of disperseing segregation.
Embodiment 2:
Continuous casting steel uses, steel carbon containing 0.40%, casting initial velocity 0.43m/min.
In the casting process, constantly send into steel band to crystallizer (groove) (diameter of phi 530mm), (cross section 3*80mm) gives and send speed 4.1m/min, steel band carbon content 0.35%.Under contactless electromagnetic vibrator effect, evoke resonance in the cold steel band, frequency 95-100HZ, wavelength 540mm.
In this instantiation, distance L 1-324mm (n=1.1), L2-162mm (n=1.1), L3-2322mm (n=9.1).
Electromagnetic vibrator ∏ shape gap width 30mm is 10 times of cold thickness of strips.
L1, L2, the change of L3 size causes following bad phenomenon:
Because the distance of L1 does not meet given dependency relation (a), has strengthened the reverse vibration of cold steel band and institute's cast steel water.
Because the distance of L3 does not meet given dependency relation (c), has aggravated the vibration of cold steel band in the draw-off mechanism in fact, causes to the mechanical break that send cold steel band, and device can not be worked on the whole reposefully.
Because the distance of L2 does not meet given dependency relation (b), has seriously dwindled the amplitude of cold steel band in institute's cast steel water direction.If embodiment 1 amplitude is 4.0-5.0mm, just between 0-0.8mm, fluctuate the device job insecurity so in the present embodiment.
In present embodiment, even casting rate drops to 0.35m/min, the speed of feeding cold steel band drops to 0.25-0.26m/min, does not also guarantee cold steel band fusing.As seen the utility model L1, L2, L3 size relationship important.
Embodiment 3:
Continuous casting steel uses, the carbon content 0.40% of steel, casting rate 0.43m/min.
In the casting process, constantly give and send cold steel band (cross section 3*80mm), give and send speed 4.1m/min, steel band carbon content 0.35% to crystallizer (groove) (diameter of phi 530mm).Under contactless electromagnetic vibrator effect, evoke resonance in the cold steel band, frequency 95-100HZ, wavelength 540mm, amplitude 4.0-5.0mm.
In this instantiation, distance L 1-270mm (n=1), L2-135mm (n=1), L3-2295mm (n=9).
The width 30mm that electromagnetic vibrator ∏ font slit begins is 10 times of cold thickness of strips.
Under above-mentioned parameter, the work of device is very normal, and ingot quality is also high.
When electromagnetic vibrator ∏ font slit narrowed down to 5.0mm, cold steel band amplitude sharply dropped to＜1.0mm, and steel band and the big noise of electromagnet percussion generation.The resonance wave of cold steel band is also destroyed, and itself has influenced ingot quality.
When electromagnetic vibrator ∏ font slit increases to 46.0mm,, cause cold steel band amplitude to drop sharply to＜1.0mm because induction is lost in a large number in the electromagnet electric power system.The reduction of amplitude has influenced the melting condition of cold steel band, does not guarantee desired metal quality level.
According to repeatedly experiment draw add cold steel amplitude range be 0.5mm-15.0mm.Add shaking of cold steel and frequently be 10-1000HZ.Add cold steel vibration wavelength be 100-160mm.During concrete the application can according to the process conditions of the physical-chemical parameters of continuous casting of metals and casting process at above-mentioned amplitude, the stable application when drawing optimum value according to embodiment with relevant relational expression adjustment with the wave-length coverage confidential reference items frequently of shaking.
Claims (3)
1. the device that is used for continuous casting of metal, comprise uncoiling machine, hauling machine, cutting machine, guide pipe, vibrator, middle molten steel jar and crystallizer, steel band (2) enters aligning hauling machine (3) from uncoiling machine, enter vibrator (6) from guide pipe (5) and enter crystallizer (10) again, to crystallizer (10) send at least one chemical composition and institute's ingot metal similar consume cold material, liquid metal molten steel jar (7) is installed the top of crystallizer (10), connect crystallizer (10) by immersed nozzle (9), it is characterized in that: vibrator (6) is the contactless electromagnetic vibrator that is produced the vibration effect by electromagnet, give and to consume cold material with mandatory resonance, the aligning hauling machine has two pairs of driven rollers and a cover control piece at least, and aligning hauling machine roller is pressed following formula to the distance between contactless electromagnetic vibrator axis and determined:
L
3＝(2n-1)·λ/4
In the formula n be 1, any integer among the 2......K;
λ is for consuming the wavelength of cold material resonance wave, mm.
2. contactless electromagnetic vibrator, it is characterized in that: contactless electromagnetic vibrator, ∏ font hole slot is arranged on horizontal plane, be equipped with that electromagnet (13), electromagnet (13) are preceding to be equipped with that deflector roll (11) before the electromagnet, preceding deflector roll (11) precedingly are equipped with backing roll (12), back deflector roll (14) is equipped with in the electromagnet back, the axis of preceding guide roller (11), the axis of back deflector roll (14) and the distance L between contactless electromagnetic vibrator axis
1And L
2Determine by following relational expression:
L
1=n λ/2 and L
2=(2n-1) λ/4
In the formula: L
1For contactless electromagnetic vibrator axis arrives leading distance between roll axis, mm;
L
2For contactless electromagnetic vibrator axis arrives the distance between the guide roller axis afterwards, mm;
N is 1, any integer between 2......K;
λ is for consuming the wavelength of the mandatory resonance wave of cold material, mm.
3. contactless electromagnetic vibrator according to claim 2 is characterized in that: the adjustable joint of the horizontal hole slot of electromagnetic vibrator ∏ font, adjustable range is add 2 times to 15 times of cold thickness of steel product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201534204U CN201023130Y (en) | 2006-12-04 | 2006-12-04 | Device for continuous metal casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201534204U CN201023130Y (en) | 2006-12-04 | 2006-12-04 | Device for continuous metal casting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101637805B (en) * | 2008-07-28 | 2012-05-23 | 刘东业 | Metal continuous casting method and device used for implementing method |
| CN102974791A (en) * | 2012-12-24 | 2013-03-20 | 营口戴斯玛克科技发展有限公司 | Steel strip feeding system of continuous casting crystallizer |
| CN103934688A (en) * | 2014-03-28 | 2014-07-23 | 盐城新世杰科技有限公司 | Waterstop steel plate forming machine |
| CN105344951A (en) * | 2015-10-29 | 2016-02-24 | 安徽助成信息科技有限公司 | Continuous metal casting crystallization device |
| CN114888254A (en) * | 2022-05-20 | 2022-08-12 | 东北大学 | Experimental device and method for simulating steel strip feeding of continuous casting crystallizer |
-
2006
- 2006-12-04 CN CNU2006201534204U patent/CN201023130Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101637805B (en) * | 2008-07-28 | 2012-05-23 | 刘东业 | Metal continuous casting method and device used for implementing method |
| CN102974791A (en) * | 2012-12-24 | 2013-03-20 | 营口戴斯玛克科技发展有限公司 | Steel strip feeding system of continuous casting crystallizer |
| CN102974791B (en) * | 2012-12-24 | 2018-04-20 | 营口戴斯玛克科技发展有限公司 | Continuous cast mold feeds steel band system |
| CN103934688A (en) * | 2014-03-28 | 2014-07-23 | 盐城新世杰科技有限公司 | Waterstop steel plate forming machine |
| CN105344951A (en) * | 2015-10-29 | 2016-02-24 | 安徽助成信息科技有限公司 | Continuous metal casting crystallization device |
| CN114888254A (en) * | 2022-05-20 | 2022-08-12 | 东北大学 | Experimental device and method for simulating steel strip feeding of continuous casting crystallizer |
| CN114888254B (en) * | 2022-05-20 | 2024-03-08 | 东北大学 | Experimental device and method for simulating continuous casting crystallizer to feed steel belt |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: YINGKOU DSMK TECHNOLOGY DEVELOPMENT CO., LTD. Assignor: Liu Dongye Contract record no.: 2012210000017 Denomination of utility model: Device for continuous metal casting Granted publication date: 20080220 License type: Exclusive License Record date: 20120301 |
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| CX01 | Expiry of patent term |
Granted publication date: 20080220 |
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| EXPY | Termination of patent right or utility model |