CN201217070Y - Pouring electric furnace for preventing magnesium iron liquid from generating degradated spheroidization and reducing point of pouring in pouring process - Google Patents
Pouring electric furnace for preventing magnesium iron liquid from generating degradated spheroidization and reducing point of pouring in pouring process Download PDFInfo
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- CN201217070Y CN201217070Y CNU2008200764439U CN200820076443U CN201217070Y CN 201217070 Y CN201217070 Y CN 201217070Y CN U2008200764439 U CNU2008200764439 U CN U2008200764439U CN 200820076443 U CN200820076443 U CN 200820076443U CN 201217070 Y CN201217070 Y CN 201217070Y
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Abstract
The utility model relates to nodular cast iron casting technical field and in particular relates to a special casting device which can prevent nodulizing degradation of the liquid nodular iron and casting temperature reduction during the casting process. The electric casting furnace comprises a furnace body, a pouring port and a feed port which are arranged on the furnace body, and a matching device used to fix the quantity of the liquid casting iron. The furnace body can take a bottom-pouring structure, a pneumatic structure or an overturned structure. A graphite electrode is arranged at the upper part of the furnace body; high-temperature melted alkaline liquid slag rich in active metal ions such as Mg<2+> and Ca<2+> is arranged on the liquid nodular iron inside the furnace body; an electrode is arranged in the liquid nodular iron; and the lower end of the graphite electrode remains in the alkaline liquid slag all the time. The matching device is provided with a DC power supply system, the anode of the power supply is connected with the upper end of the graphite electrode, and the cathode of the power supply is connected with the electrode arranged in the liquid nodular iron. The electric casting furnace is capable of stabilizing casting temperature and totally avoiding nodulizing degradation, thus reducing waste loss during the production of the nodular cast iron piece. The electric casting furnace reduces nodulizer consumption and reduces operation and maintenance difficulties of the electric ductile iron casting furnace, thus reducing production cost and simplifying manual furnace repairing and slag skimming operations. The electric casting furnace is of great popularization and application significances to automobile parts and centrifugal casting pipes manufacturing enterprises with continuous mass production of nodular cast iron pieces.
Description
Technical field
The utility model relates to the spheroidal graphite cast-iron casting technology field, is specifically related to a kind of dedicated pouring equipment that can avoid ductile iron liquid that decaying spheroidisation takes place in casting process and reduce pouring temperature.
Background technology
Spheroidal graphite cast-iron is a kind of casting alloy that grows up late 1940s, and it is to add nodulizer and inovulant and the nodular cast iron that obtains in molten iron.Because graphite is spherical, its mechanical performance is better than malleable cast iron considerably beyond casting pig, even near steel, and price is lower than steel, and still has many premium properties of regular gray iron, as good castability, damping property, machinability and low notch sensitivity etc.Therefore, many important machine components such as bent axle, connecting rod, gear, valve body, cylinder sleeve etc. all can adopt spheroidal graphite cast-iron, to save steel, to reduce cost, spheroidal graphite cast-iron is with its good performance, in use can replace expensive cast steel and forged steel sometimes, in machine building industry, be used widely.In the technical process of producing spheroidal graphite cast-iron, the main factor of decision spheroidal graphite cast-iron mechanical performance has: (1) depends primarily on formed graphite shape in the iron liquid process of setting, rather than chemical composition such as its carbon silicon, therefore be called as production performance unsettled " magic " metal material.Magnesium iron is packet-by-packet to carry out spheroidising after the smelting of finishing original iron melt again, can there be difference in the inferior ductile iron liquid of not only different bags, main is that same iron clad liquid also can " decaying spheroidisation " variation just take place in several minutes, and very big difference appears in its performance of foundry goods that different time watered before and after making.These 2 reasons have increased the difficulty of process of factory production quality control greatly, and therefore magnesium iron also is regarded as unsettled " low reliability material ", has limited further developing of it.(2) ductile iron liquid does not allow effective duration of pouring of pouring into a mould again very short because of " decaying spheroidisation " takes place, and has only tens minutes usually.And carry out the heat tracing obviously speed of aggravation decaying spheroidisation to iron liquid this moment, so magnesium iron spare production line uses pouring electric furnace equipment at present hardly, and iron liquid cooling phenomenon is more serious in the casting process, thereby brings the percent defective rising relevant with pouring temperature.(3) developed country is applied to the moulding of auto industry magnesium iron spare at present; inert gas (the argon gas of cast streamline; nitrogen) method of protection pressure pouring; though solved the pouring temperature problem of unstable; make the pouring temperature stable and controllable; and the time that has obviously delayed to take place decaying spheroidisation; but do not stop the decaying spheroidisation problem; and must go into the nodulizer loss that the residual magnesium content of stove iron liquid is constantly replenished ductile iron liquid by raising; both increased nodulizer consumption; cause the continuous and furnace lining reaction of excess metal magnesium in the iron liquid again; make furnace lining constantly thicken, shortened the maintenance life cycle of electric furnace liner.Simultaneously, owing to need carry out air seal to pouring electric furnace, make the furnace construction complexity, the operation and maintenance technical difficulty is big, and equipment investment is big.
The utility model content
The purpose of this utility model is to provide a kind of dedicated pouring equipment that can avoid ductile iron liquid that decaying spheroidisation takes place and reduce pouring temperature in casting process, it can solve above-mentioned three problems, stablize pouring temperature, avoid decaying spheroidisation fully, thereby reduce the loss due to spoiled work that magnesium iron spare is produced; Reduce the consumption of nodulizer, reduce the Operation and Maintenance difficulty of ductile iron liquid pouring electric furnace, thereby reduce production costs, simplify repairing stove, taking off slag operation of workman.This technical equipment satisfies the long-term continuous stabilization production of spheroidal graphite cast-iron for the reliability that improves spheroidal graphite cast-iron, particularly for the enterprise that produces nodular iron casting continuously in enormous quantities such as auto parts, spun cast pipe, has important popularization, application value.
The technical solution of the utility model is: the utility model pouring electric furnace equipment comprises body of heater, be provided in sprue gate and pan feeding opening on the body of heater, supporting setting cast iron liquid is carried out quantitative device, the furnace binding form can be a bottom filling, or vapour-pressure type, use in the stove of its sealing and be rich in the compressed air of oxygen, and do not use nitrogen or the argon gas or the structure of Dumpage type, it is characterized in that: be provided with graphite electrode in upper of furnace body, in stove, be provided with on the ductile iron liquid in the stove and be rich in Mg
2+, Ca
2+(dated especially: the round parentheses " () " before and after each ion represent that this ion is an ion contained in the caustic slag herein Deng the high-temperature fusion caustic slag liquid of active metal ion; Square brackets " [] " before and after each ion represent that this ion is the ion in the ductile iron liquid), in ductile iron liquid, be provided with electrode, the lower end of graphite electrode remains to be stretched in caustic slag liquid, the supporting DC power system that is provided with, power anode connects the graphite electrode upper end, and power cathode connects the electrode that is provided with in the ductile iron liquid.
The present invention increases in body of heater and is provided with induction heating apparatus or combustion gas or oil burner heater or oxygen-gas flame burner heater or the plasma heater that adds hot iron liquid, or increases simultaneously above-mentioned several additional heating device is set.The refractory lining material that this direct current Bohler electroslag tapping installing of the present invention is equipped with preferably adopts the magnesia or the knotting of dolime class basic refractory of being rich in MgO to build by laying, and emphasizes to avoid use to be rich in SiO
2, Al
2O
3Refractory material knotting.Above-mentioned pouring electric furnace equipment, the composition of basic slag liquid material that covers iron liquid end face in its direct current electroslag casting equipment is for being rich in Mg
2+, Ca
2+Deng the polynary slag of active metal ion, the fusing point adjustment of slag is controlled in 1250 ℃～1500 ℃ the proper range.
This invention is utilized the electrometallurgy principle of " dc electrolysis groove ", and this pouring electric furnace equipment is provided with a cover direct current slag system: ductile iron liquid is provided with and is rich in mG in the stove
2+, Ca
2+Deng the high-temperature fusion caustic slag of active metal ion, upper of furnace body is provided with the carbon bar furnace that inserts fusion alkalescence slag layer, is provided with the electrode that connects DC power system in ductile iron liquid; With nodularization iron liquid as negative electrode (utilize hearth electrode or lateral electrode power supply), will insert fusion the basic furnace slag blanket graphite electrode as anode, with the caustic slag of fusion as liquid electrolyte.Ductile iron liquid seals by the high-temperature fusion caustic slag that floats over iron liquid end face, so that the oxygen in interior ductile iron liquid of stove and the atmosphere is isolated fully.Inject ductile iron liquid in the stove and annotate the direct current that low-voltage, big electric current are connected in the back, galvanic current strength is determined according to furnace volume: molten iron 20 ~ 50 Faraday's electric current equivalents per hour per ton, connect direct current rear section electric energy and become chemical energy, be controlled to be in 1500 ℃～1600 ℃ the high-temperature alkaline slag liquid in temperature cell reaction, Mg in the slag can take place
2+, Ca
2+Directed mobile Deng cation to negative electrode, and S in the slag
2-Move the S of remnants in the iron liquid Deng the anion anode
2-Also can float and entered slag Deng anion by the attraction of different in nature electrode; S in these high-temperature slags
2-Anion, and the S that when the spheroidising bag injects iron liquid in pouring furnace, brings a small amount of high sulphur slag of high-temperature alkaline slag into
2-Anion all can lose electronics and becomes the high-temperature liquid state sulphur of free state near anode, directly burn into SO behind the ingress of air
2Gas, thus constantly from the fusion basic slag, be eliminated; Connect galvanic electric weight when enough, the electrode potential that slag-Jin interface exists will make free state Mg content in the iron liquid and the ION Mg in the slag
2+Content reaches the electrochemical equilibrium that guarantees the spheroidizing process requirement, and this can suppress Mg atom in the ductile iron liquid and lose electronics and become Mg
2+Cation and enter slag, thereby the residual magnesium content of keeping in the iron liquid no longer reduces, even when accidentally injecting that a bag residual magnesium content in the stove is on the low side the iron liquid of decaying spheroidisation have been taken place and caused the whole residual magnesium content decline of iron liquid in the pouring electric furnace, can also make the magnesium content increase of this iron liquid and return to normal value, prevent decaying spheroidisation.
Remaining (S in iron liquid and the electroslag
2-) anion can lose the high-temp liquid sulphur that electronics becomes free state near anode, just touch airborne oxygen when floating to the high temperature furnace slag surface on it, oxidizing fire generates SO immediately
2Gas directly discharges out of the furnace, thereby is beneficial to recycling for a long time of caustic slag:
(S
2-)-2e＝(S)
(S)+O
2＝SO
2↑
When the current potential between the different electrodes reached certain enough big numerical value, the metal cation in the slag also can be separated out on negative electrode.For example, under galvanic electrolysis, MgO, MgF in the caustic slag at iron liquid top (also comprising the furnace lining that partly comes off)
2, CaO, etc. (the Mg in the chemical composition
2+) and (Ca
2 +) cation, also electron gain is reduced after touching as the iron liquid of negative electrode, becomes [Mg], [Ca] etc. and enters iron liquid:
(Mg
2+)+2e＝[Mg]
The ductile iron liquid that in this direct current slag hearth, is incubated, can be under the galvanic effect of 500～2000A, the loss of ω (Mg) is reduced greatly, and at iron liquid ω (Mg) during near gold-slag interfacial electrochemistry equilibrium valve, decline rate goes to zero, make iron liquid residual magnesium content tend to be steady, and satisfied the scope of the desired ω of pouring technology (Mg)＞0.030～0.050%, thereby eliminated the possibility of decaying spheroidisation fully.
The MgS bits of a small amount of discrete particles shape that advances as for the spheroidising band, also can skim and together with the direct impouring pouring electric furnace of iron liquid, the granular MgS slag that at this moment floats over the slag blanket end face can be directly under high temperature action and airborne oxygen generation displacement reaction:
2MgS+O
2＝2?MgO+S
2
S
2+2?O
2＝2?SO
2↑
The MgO that generates enters slag, thereby has both reduced the workload of skimming, but waste recycling again makes the magnesium metal that plays desulfidation in the nodularization process, has realized recycling in this pouring electric furnace:
2MgS+3?O
2＝2?MgO+2?SO
2↑
Beneficial effect of the present invention is: the present invention is in preventing production technologies such as decaying spheroidisation, magnesium iron is changed into highly stable, reliable material by a kind of instability, insecure material, the control of ductile iron production procedure quality is carried out the stokehold check and checked on afterwards by experience that relies on the people and sense of responsibility, be converted into the technology regulation and control of the cast front and back that process equipment is stylized, once and for all has solved magnesium iron material capability stable problem.In fact, this is the great technological progress with breakthrough meaning that the ductile iron production technology is born and comes 50 more.
The main effect of direct current flux shielding pouring electric furnace equipment can reduce following some:
1. the structure of pouring electric furnace and control system are simplified greatly, and stove need not sealing, also need not processings of regularly skimming, and furnace lining can progressive additive yet, and equipment is operated simpler; The most important thing is that this equipment slows down the with better function of decaying spheroidisation, even can make it to avoid fully (theoretically, the nodularization of the iron liquid in the direct current slag hearth is held time and can be extended to infinity), and nodulizer consumption is reduced, the addition trend steadily, make the production process quality control level of ductile iron material improve greatly, make the reliability of its material capability bring up to unprecedented degree;
2. electroslag adds hot iron liquid and has avoided pouring temperature to pass in time and constantly descend, guaranteed that pouring temperature is qualified, stable, fluctuation is minimum, thereby raising casting quality, obviously reduce the loss due to spoiled work relevant (in the Foundry Production of magnesium iron spare with the iron liquid casting temperature, not only kind is many for this class waste product, and shared proportion is very high in the waste product total amount, except tangible cold shut, misrun, pin hole, suppress experiment defective or the like, also have subcutaneous blowhole, black slag, slag blister, sand holes, shrinkage porosite, hardness higher etc., all on the low side relevant with pouring temperature).
3. be large-tonnage iron casting such as cast large-diameter pipe etc. (for example nuke rubbish storage tank etc.), the once-cast amount of iron liquid is sometimes above tens tons, if with the many like this ductile iron liquid of common spheriodization process thereof equipment single treatment, needs are increased equipment such as the spheroidising iron liquid bag of especially big tonnage and heavy overhead traveling crane, general enterprise is difficult to accomplish.Adopt this pouring electric furnace packet-by-packet to put aside the qualified ductile iron liquid of capacity, just can use the way of " plodding away at a big job bit by bit ", just can produce heavy iron casting in non-heavy foundry shop, and needn't purchase equipment such as large-tonnage spheroidising iron liquid bag and heavy overhead traveling crane, do not need to improve factory building load-bearing requirement yet, just can enlarge the Workshop Production ability, this all has very real and important techniques economic implications very to the many big-and-middle-sized foundry enterprises of China.
Compare with inert gas shielding pressure pouring electric furnace, this direct current flux shielding pouring furnace has the following advantages:
1. device structure is simplified greatly, the blow-by of body of heater bell, therefore do not need complicated air pressure control servo control mechanism yet, but make the oxygen in itself and the atmosphere isolated fully, act on thereby play " sealing " more reliably by floating over abundant liquid electric slag layer above the iron liquid; The simplification of equipment also makes its reliability improve, invest and reduce, and both has been convenient to make maintenance and furnace lining knotting, also is convenient to operate control.
2. because the sulphur that enters in the high temperature electroslag can be oxidized to gaseous product SO
2Run away, and the magnesium ion in the slag can also reduce again to get back under the electrochemical action at slag-Jin interface and goes in the iron liquid, therefore, can just handle directly impouring pouring electric furnace without skimming to subcontracting magnesium sulfide, the magnesia bits that spheroidizing reacion produces, make magnesium elements recycling therein in the slag and " turning harm into good ", " turning waste into wealth ".The cancellation operation of skimming also can be improved nodularization worker's working condition, the technology that simplifies the operation, shorten the processing time, enhance productivity, and because of reduced subcontract in the cooling of iron liquid save the insulation electric energy.
3. because there is electrode potential in the slag-Jin interface in the electroslag protection pouring electric furnace; after content of magnesium reaches equilibrium valve; the remaining magnesium of iron liquid will no longer lose; so subcontract the addition that the spheroidising operation can obviously reduce magnesium metal, the normal level that makes the remaining magnesium of iron liquid reach ω (Mg) ≮ 0.04%～0.05% gets final product.This has not only reduced the nodulizer cost, has also solved furnace lining and has thickened problem.
This technical equipment satisfies the long-term continuous stabilization production of spheroidal graphite cast-iron for the reliability that improves spheroidal graphite cast-iron, particularly for the enterprise that produces nodular iron casting continuously in enormous quantities such as auto parts, spun cast pipe, has important popularization, application value.
Description of drawings
Fig. 1 is the structural representation of bottom pouring type pouring furnace equipment in the utility model
Fig. 2 is the structural representation of vapour-pressure type pouring electric furnace equipment in the utility model
Fig. 3 is the structural representation of Dumpage type pouring electric furnace equipment in the utility model
The specific embodiment
Bottom pouring type pouring furnace equipment in the utility model comprises cast body of heater 1 as shown in Figure 1, sprue gate 2, and sprue gate 2 is equipped with stopper rod 3, is provided with on the ductile iron liquid 5 in stove and is rich in Mg
2+, Ca
2+Deng the high-temperature fusion caustic slag liquid 6 of active metal ion, in ductile iron liquid 5, be provided with side intercalative electrode 7, cast body of heater 1 is provided with the graphite electrode 4 that has set apparatus for automatically lifting, keeps the lower end of graphite electrode 4 to stretch into all the time in the fusion caustic slag liquid 6.The DC power system of supporting setting is 8, and its anode connects the upper end of graphite electrode 4, and its negative electrode connects side intercalative electrode 7.
Vapour-pressure type pouring electric furnace equipment in the utility model uses in the stove of its sealing and is rich in the compressed air of oxygen, and do not use nitrogen or argon gas as shown in Figure 2, comprise body of heater a1, sprue gate a2, sprue gate a2 is equipped with stopper rod a3, is provided with on the ductile iron liquid a5 in stove and is rich in Mg
2+, Ca
2+High-temperature fusion caustic slag liquid a6 in the active metal ion, in ductile iron liquid a5, be provided with side intercalative electrode a7, or hearth electrode a 7, the lid a9 on cast body of heater a1 top is provided with the graphite electrode a4 that has set apparatus for automatically lifting, keeps the lower end of graphite electrode a4 to stretch into all the time in the fusion caustic slag liquid a6.The DC power system of supporting setting is a8, and its anode connects the upper end of graphite electrode a4, its negative electrode connect side intercalative electrode a7 or hearth electrode a 7.Also be equipped with the gas extraction system a10 that calms the anger on the lid a9.
Dumpage type pouring electric furnace equipment among the present invention comprises body of heater b1 as shown in Figure 3, sprue gate b2, and the pan feeding opening, sprue gate b2 is equipped with stopper rod b3, is provided with on the ductile iron liquid b5 in stove and is rich in Mg
2+, Ca
2+Deng the high-temperature fusion caustic slag liquid b6 of active metal ion, in ductile iron liquid b5, be provided with water-cooled hearth electrode b7.The lid b9 on cast body of heater b1 top is provided with the graphite electrode b4 that has set apparatus for automatically lifting, keeps the lower end of graphite electrode b4 to stretch into all the time in the fusion caustic slag liquid b6.The DC power system of supporting setting is a8, and its anode connects the upper end of graphite electrode b4, and its negative electrode connects hearth electrode b7.
Claims (3)
1, avoid ductile iron liquid that the pouring electric furnace of decaying spheroidisation and reduction pouring temperature takes place in casting process, this equipment comprises body of heater, be provided in sprue gate and pan feeding opening on the body of heater, supporting setting cast iron liquid is carried out quantitative device, the furnace binding form can be a bottom filling, or vapour-pressure type, or the structure of Dumpage type, it is characterized in that: be provided with graphite electrode in upper of furnace body, in stove, be provided with one deck high-temperature fusion caustic slag liquid on the ductile iron liquid, in ductile iron liquid, be provided with electrode, the lower end of graphite electrode is stretched in the caustic slag liquid, the supporting DC power system that is provided with, power anode connect the graphite electrode upper end, and power cathode connects the electrode that is provided with in the ductile iron liquid.
2, pouring electric furnace equipment according to claim 1, it is characterized in that: increase is provided with induction heating apparatus or combustion gas or oil burner heater or oxygen-gas flame burner heater or the plasma heater that adds hot iron liquid in body of heater, or increase is provided with above-mentioned several additional heating device simultaneously.
3, pouring electric furnace equipment according to claim 1, it is characterized in that: the refractory lining material that this direct current Bohler electroslag tapping installing is equipped with preferably adopts the magnesia or the knotting of dolime class basic refractory of being rich in MgO to build by laying, and emphasizes to avoid use to be rich in SiO
2, Al
2O
3Refractory material knotting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200764439U CN201217070Y (en) | 2008-03-10 | 2008-03-10 | Pouring electric furnace for preventing magnesium iron liquid from generating degradated spheroidization and reducing point of pouring in pouring process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200764439U CN201217070Y (en) | 2008-03-10 | 2008-03-10 | Pouring electric furnace for preventing magnesium iron liquid from generating degradated spheroidization and reducing point of pouring in pouring process |
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| CN201217070Y true CN201217070Y (en) | 2009-04-08 |
Family
ID=40539906
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| CNU2008200764439U Expired - Fee Related CN201217070Y (en) | 2008-03-10 | 2008-03-10 | Pouring electric furnace for preventing magnesium iron liquid from generating degradated spheroidization and reducing point of pouring in pouring process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009111973A1 (en) * | 2008-03-10 | 2009-09-17 | Wang Yuxin | Method for treating spheroidal graphite iron and pouring device thereof |
| WO2011064415A1 (en) * | 2009-11-25 | 2011-06-03 | Fundacion Inasmet | Inoculation procedure and device |
| CN102703985A (en) * | 2012-06-26 | 2012-10-03 | 上海太阳能电池研究与发展中心 | Method for preparing high-purity polycrystalline silicon under action of electric field and fused salt |
| CN102909332A (en) * | 2012-11-05 | 2013-02-06 | 莱芜钢铁集团有限公司 | Device and method for controlling superheat degree of molten steel in continuous casting ladle or tundish |
| CN110871268A (en) * | 2018-09-04 | 2020-03-10 | 上海梅山钢铁股份有限公司 | Equipotential control device and method for plasma heating of continuous casting tundish |
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2008
- 2008-03-10 CN CNU2008200764439U patent/CN201217070Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009111973A1 (en) * | 2008-03-10 | 2009-09-17 | Wang Yuxin | Method for treating spheroidal graphite iron and pouring device thereof |
| US8419821B2 (en) | 2008-03-10 | 2013-04-16 | Yuxin Wang | Method for treating spheroidal graphite iron and pouring device thereof |
| US8767793B2 (en) | 2008-03-10 | 2014-07-01 | Yuxin Wang | Method for treating spheroidal graphite iron and pouring device thereof |
| CN101658901B (en) * | 2008-03-10 | 2014-10-29 | 王宇新 | Processing method and special casting equipment for preventing ductile iron liquor from generating spheroidization recession and reducing casting temperature in process of casting |
| WO2011064415A1 (en) * | 2009-11-25 | 2011-06-03 | Fundacion Inasmet | Inoculation procedure and device |
| CN102712034A (en) * | 2009-11-25 | 2012-10-03 | 伊纳斯米特基金会 | Inoculation procedure and device |
| RU2518879C2 (en) * | 2009-11-25 | 2014-06-10 | Фундасион Инасмет | Method and device for inoculation |
| CN102712034B (en) * | 2009-11-25 | 2014-06-18 | 伊纳斯米特基金会 | Inoculation procedure and device |
| US8920532B2 (en) | 2009-11-25 | 2014-12-30 | Fundacion Tecnalia Research & Innovation | Inoculation process and device |
| CN102703985A (en) * | 2012-06-26 | 2012-10-03 | 上海太阳能电池研究与发展中心 | Method for preparing high-purity polycrystalline silicon under action of electric field and fused salt |
| CN102909332A (en) * | 2012-11-05 | 2013-02-06 | 莱芜钢铁集团有限公司 | Device and method for controlling superheat degree of molten steel in continuous casting ladle or tundish |
| CN110871268A (en) * | 2018-09-04 | 2020-03-10 | 上海梅山钢铁股份有限公司 | Equipotential control device and method for plasma heating of continuous casting tundish |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090408 Termination date: 20140310 |