CN104726760A - Method for manufacturing the oriented electrical steel sheet - Google Patents
Method for manufacturing the oriented electrical steel sheet Download PDFInfo
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- CN104726760A CN104726760A CN201410806720.7A CN201410806720A CN104726760A CN 104726760 A CN104726760 A CN 104726760A CN 201410806720 A CN201410806720 A CN 201410806720A CN 104726760 A CN104726760 A CN 104726760A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
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Abstract
The method for manufacturing the oriented electrical steel sheet according to one embodiment of the present invention comprises the steps of providing an electrical steel sheet slab; re-heating the slab; hot-rolling the slab into a hot-rolled steel sheet; cold-rolling the hot-rolled steel sheet into a cold-rolled steel sheet; performing primary recrystallization annealing on the cold-rolled steel sheet; and performing secondary recrystallization annealing on the electrical steel sheet after primary recrystallization annealing, wherein the secondary recrystallization annealing is performed in a state with an electric field applied.
Description
Technical field
The present invention relates to a kind of manufacture method and oriented electrical steel of oriented electrical steel.
Background technology
Oriented electrical steel is a kind of soft magnetic material that magnetic property is very excellent on steel plate rolling direction, because oriented electrical steel forms so-called goss texture, wherein all crystal grains of steel plate surface is oriented to { 110} face, and crystalline orientation is parallel to < 001 > axle in the rolling direction.
Usually, magnetic property represents magneticflux-density and iron loss, by crystal grain according to { 110} < 001 > is orientated correctly to arrange and just can obtains high magnetic flux density.
The oriented electrical steel of magnetic property excellence its { 110} < 001 > orientation goss texture (Gosstexture) should be highly developed along steel plate rolling direction, in order to form this set texture, Gauss's orientation crystal grain need be formed by the secondary recrystallization of abnormal grain growth.
For forming this goss texture, very accurately, strictly should control various processing condition, as make steel the stage component control, hot rolling time slab reheat and hot rolling technology controlling factors, hot-rolled sheet annealing, primary recrystallization annealing, secondary recrystallization annealing etc.
Oriented electrical steel be reheated by slab, hot rolling, hot-rolled sheet annealing, once cold rolling or comprise the secondary cold-rolling of process annealing, primary recrystallization, secondary recrystallization technique manufactures.
Secondary recrystallization annealing process is divided into the temperature rise period of the secondary recrystallization forming Gauss (Goss) crystal grain and improves purifying annealing (purification annealing) stage of iron loss.
In the temperature rise period, in order to allow the secondary recrystallization forming Gauss (Goss) crystal grain stably occur, start temperature 1050 DEG C ~ 1100 DEG C to be warming up to secondary recrystallization less than or equal to the speed slowly of 40 DEG C/hr.
Formed after the secondary recrystallization of Gauss (Goss) crystal grain terminates, because precipitate forming element N and S is not completely removed, precipitate can be formed again during cooling, and there is a lot of island crystal grain (island grain) in secondary recrystallization Gauss crystal grain, cause iron loss to increase.
Therefore, at the temperature of more than 1100 DEG C that secondary recrystallization terminates, implement the long-time purifying annealing of more than 30 hours, to remove the island crystal grain in residual N, S and secondary recrystallization crystal grain, and then improve iron loss.
The purifying annealing process carrying out the long heat treatment of more than 30 hours at temperature more than 1100 DEG C is the necessary technique guaranteeing low iron loss, but the productivity of oriented electrical steel can be caused to decline, and maintenance high temperature will consume a lot of energy.
Summary of the invention
The object of the present invention is to provide a kind of oriented electrical steel and manufacture method thereof.
The manufacture method of the oriented electrical steel of one embodiment of the invention, comprising:
There is provided electrical sheet slab, described electrical sheet slab comprises the Si of 2.0 ~ 6.5% in weight percent (%), and surplus is Fe and other inevitable impurity;
Described slab is reheated;
Described slab is rolled into hot-rolled steel sheet;
By cold rolling for described hot-rolled steel sheet one-tenth cold-rolled steel sheet;
Primary recrystallization annealing is carried out to described cold-rolled steel sheet; And
Secondary recrystallization annealing is carried out to the electrical sheet after described primary recrystallization annealing;
Wherein, described secondary recrystallization annealing carries out under the state applying electric field.
Described secondary recrystallization annealing comprises temperature rise period and purifying annealing stage, and described purifying annealing can be carried out under the state applying electric field.
The size of described electric field can be 1kV/cm ~ 3kV/cm.
For the annealing atmosphere of secondary recrystallization annealing, the mixed gas of hydrogen and nitrogen can be used to heat-treat in the temperature rise period, hydrogen can be used to carry out equal thermal treatment at purifying annealing stage.
The described temperature rise period is warming up to stage of 1050 DEG C ~ 1100 DEG C, can heat up, and can carry out purifying annealing under the temperature more than 1100 DEG C with the heat-up rate less than or equal to 40 DEG C/hr.
The manufacture method of described oriented electrical steel, can also comprise: after described rolling hot-rolling steel plate, anneal to hot-rolled sheet, and described hot-rolled sheet annealing can be carried out under the temperature more than 900 DEG C.
Carry out once cold rolling when described rolling cold-rolled steel sheet or comprise more than twice of process annealing cold rolling, and the temperature can carrying out steel plate in cold-rolled process maintains the warm-rolling of more than 100 DEG C.
The manufacture method of described oriented electrical steel, also can comprise: after described rolling cold-rolled steel sheet, to cold-rolled steel sheet carry out decarburizing annealing and nitrogenize annealing, and described to cold-rolled steel sheet carry out decarburizing annealing and nitrogenize annealing time, can carry out simultaneously decarburizing annealing and nitrogenize annealing.
It is 100 ~ 300ppm that described decarburizing annealing and nitrogenize annealing can proceed to the nitrogen quantity formed in steel plate.
Described slab can comprise the Si of 2.0 ~ 6.5%, Al, the Mn (not comprising 0%) of less than 0.20%, N, the C of 0.01 ~ 0.10%, the S (not comprising 0%) of less than 0.01% of less than 0.01% of 0.015 ~ 0.04% in weight percent (%), and surplus is Fe and other inevitable impurity.
The oriented electrical steel of one embodiment of the invention manufactures by the following method, electrical sheet slab is reheated, be rolled into hot-rolled steel sheet, this slab comprises the Si of 2.0 ~ 6.5% by weight percentage, surplus is Fe and other inevitable impurity, then by cold rolling for described hot-rolled steel sheet one-tenth cold-rolled steel sheet, primary recrystallization annealing is carried out to described cold-rolled steel sheet, again secondary recrystallization annealing is carried out to the electrical sheet after described primary recrystallization annealing, described secondary recrystallization annealing is carried out under the state applying electric field, remain in the N in electrical sheet, S content is respectively below 10ppm.
Described secondary recrystallization annealing comprises temperature rise period and purifying annealing stage, and under the state applying described electric field, carry out described purifying annealing, then residual in electrical sheet N, S content can be below 10ppm respectively.
When the size of described electric field is 1kV/cm ~ 3kV/cm, residual N, S content in electrical sheet can be below 10ppm respectively.
The manufacture method of the oriented electrical steel of one embodiment of the invention shortens the purifying annealing time in secondary recrystallization technique, thus boosts productivity.
And, shorten purifying annealing time and can reduce the energy produced needed for electrical sheet, thus improve economical efficiency.
In addition, the atomic diffusion rates of electrical sheet inside can be increased during purifying annealing, after purifying annealing, island crystal grain (island grain) in residual N, S and Gauss (GOSS) secondary recrystallization crystal grain is less than electrical sheet in the past, therefore, it is possible to provide the electrical sheet than electrical sheet magnetic property excellence in the past.
Embodiment
The following example of reference accompanying drawing and detailed description, just can be expressly understood advantage of the present invention, feature and realize the method for these advantage and disadvantages.But the present invention can implement in a variety of different ways, is not limited to the following example.There is provided the object of the following example to be, fully openly the present invention has one comprehensively to understand to make those skilled in the art to summary of the invention, and protection scope of the present invention should be as the criterion with claims.The Reference numeral identical in specification sheets in the whole text represents identical integrant.
The manufacture method of the oriented electrical steel of one embodiment of the invention, comprising: provide electrical sheet slab; Described slab is reheated; Described slab is rolled into hot-rolled steel sheet; By cold rolling for described hot-rolled steel sheet one-tenth cold-rolled steel sheet; Primary recrystallization annealing is carried out to described cold-rolled steel sheet; And secondary recrystallization annealing is carried out to the electrical sheet after described primary recrystallization annealing, wherein, described secondary recrystallization annealing carries out under the state applying electric field.
Described electric field level can be 1kV/cm ~ 3kV/cm.
Described secondary recrystallization annealing comprises temperature rise period and purifying annealing stage, and described purifying annealing can be carried out under the state applying electric field.
For the annealing atmosphere that described secondary recrystallization is annealed, the temperature rise period can heat-treat under the mixed-gas atmosphere of hydrogen and nitrogen, and purifying annealing stage can carry out equal thermal treatment in a hydrogen atmosphere.
The described temperature rise period is warming up to stage of 1050 DEG C ~ 1100 DEG C, can heat up, and can carry out purifying annealing under the temperature more than 1100 DEG C with the heat-up rate less than or equal to 40 DEG C/hr.
In the manufacturing process of oriented electrical steel, in order to stably secondary recrystallization can be there is under high temperature, use precipitate as grain growth inhibitor, at the temperature more than precipitate decomposition temperature, secondary recrystallization can occur.
But, after secondary recrystallization annealing, if precipitate forming element N and S remains in electrical sheet, precipitate can be formed during cooling again and hinder magnetic domain to move, thus cause iron loss to increase.Because the secondary recrystallization forming Gauss (Goss) crystal grain occurs with speed quickly, therefore after secondary recrystallization terminates, a lot of island crystal grain (island grain) can be there is in Gauss (Goss) crystal grain, and this island crystal grain also can hinder the movement of magnetic domain, iron loss is caused to increase.
Therefore, for manufacturing the oriented electrical steel of low iron loss, after secondary recrystallization, the purifying annealing process at high temperature carrying out long heat treatment must be implemented.
If increase the velocity of diffusion of atom, N and S diffusion residual after forming secondary recrystallization will be impelled, and then the time of removing N and S can be shortened, also can impel Fe diffusion in mother metal, and then the time of removing island crystal grain can be shortened.
There is a lot of unbound electron in metallic substance, when utilizing electrode to apply electric field from outside, surface meeting is charged and polarity is contrary with outer electrode, produces potential difference between surface and center.Therefore, can produce the difference of electro-chemical potential (electro-chemical potential), in metal, the hole mobility of opposite band negative polarity can increase.The increase of hole mobility finally makes iron atom velocity of diffusion increase.
Therefore, purifying annealing stage in secondary recrystallization annealing, if heat-treated under the state applying electric field, N and S diffusion residual after forming secondary recrystallization will be impelled, and then the time of removing N and S can be shortened, also impel the Fe of mother metal to spread, and then the time of removing island crystal grain can be shortened.
And, if carry out purifying annealing under the state applying electric field, more effectively N, S can be removed than prior art.Therefore, according to one embodiment of the invention, N and the S content remained in electrical sheet can control at below 10ppm by oriented electrical steel after secondary recrystallization annealing respectively.
In order to have uniform recrystallize microtextured and the distribution of fine precipitate before cold rolling, after described rolling hot-rolling steel plate, can also anneal to hot-rolled sheet, described hot-rolled sheet annealing can be carried out under the temperature more than 900 DEG C.
In addition, carry out once cold rolling when described rolling cold-rolled steel sheet or comprise more than twice of process annealing cold rolling, and the warm-rolling that steel billet temperature maintains more than 100 DEG C can be carried out in cold-rolled process.
And the primary recrystallization annealing carried out after described rolling cold-rolled steel sheet, can carry out nitrogenize annealing or can carry out decarburizing annealing and nitrogenize annealing after decarburizing annealing simultaneously.
It is 100 ~ 300ppm that described decarburizing annealing and nitrogenize annealing can proceed to the nitrogen quantity formed in steel plate.When nitrogen quantity is less than 100ppm, nitrogen possibly normally cannot form inhibitor, when nitrogen quantity is more than 300ppm, in secondary recrystallization annealing process, except denitrification may need the too much time.
Described slab comprises the Si of 2.0 ~ 6.5%, and surplus is Fe and other inevitable impurity.And described slab also can comprise Al, the Mn (not comprising 0%) of less than 0.20%, N, the C of 0.01 ~ 0.10%, the S (not comprising 0%) of less than 0.01% of less than 0.01% of 0.015 ~ 0.04%.
The reason of the described components system of restriction is described.
[Si:2.0 ~ 6.5 % by weight]
Si, as the basal component of electrical sheet, plays and increases the effect that resistivity of material reduces iron loss (core loss).
When Si content is less than 2.0 % by weight, resistivity reduces eddy-current loss to be increased, and causes iron loss characteristic deterioration.And when high temperature annealing, undergo phase transition between ferrite and austenite, not only secondary recrystallization becomes unstable, and set texture also can be badly damaged.
When Si content is more than 6.5 % by weight, the mechanical equivalent of light fragility of electrical sheet increases and toughness reduces, and causing plate in the operation of rolling to split incidence increases, and the formation of secondary recrystallization becomes unstable.
[Al:0.005 ~ 0.04 % by weight]
Al is except the AlN of micro-precipitation when hot rolling and hot-rolled sheet annealing, also to be combined with Al, Si, Mn of existing with solid solution condition in steel with the Nitrogen ion imported by ammonia during cold rolling after annealing and the nitride form of (Al, Si, Mn) N and the AlN type formed exists, thus to play the effect of powerful grain growth inhibitor.
When Al is less than 0.005 % by weight, the quantity formed and volume are quite low level, therefore can not expect sufficient inhibitor effect.
When Al is more than 0.040 % by weight, form thick nitride, grain growing restraint can be reduced.
[Mn:0.20 less than % by weight]
Mn increases resistivity and reduces eddy-current loss, thus there is the effect reducing overall iron loss, and carry out reacting with the nitrogen imported by nitriding treatment with Si and form the precipitate of (Al, Si, Mn) N, thus suppressing the growth of primary recrystallization crystal grain, there is secondary recrystallization.
When Mn is more than 0.20 % by weight, surface of steel plate is except Fe
2siO
4outside also can form a large amount of (Fe, Mn) and Mn oxide compound, and then hinder in high temperature annealing and form base coating, cause poor surface quality, and the phase transformation caused when high temperature annealing between ferrite and austenite, therefore gathering texture can be badly damaged, and magnetic property is greatly deteriorated.Therefore, Mn content is limited to less than 0.20 % by weight.
[N:0.01 less than % by weight]
N reacts with Al the element forming AlN.In process for making, when N is more than 0.01 % by weight, then, in process after hot rolling, because nitrogen diffusion can cause surface imperfection, and under slab state, forms too much nitride and reduce rolling, causing subsequent technique to become complicated, cost increase.
And, when the annealing process after cold rolling carries out the nitriding treatment utilizing ammonia, necessary N solid solution again can be made further for forming the nitride such as (Al, Si, Mn) N and AlN.
[C:0.01 ~ 0.10 % by weight]
C, as the element causing phase transformation between ferrite and austenite, is the necessary element of rolling improving the bad electrical sheet of the strong rolling of fragility.But when C remains in the finished product, the carbide formed because of magnetic aging effect can make magnetic property be deteriorated.
When C content is less than 0.01 % by weight, then because the phase transformation between ferrite and austenite can not normally play a role, the uneven homogenize of slab and hot rolling microtextured can be caused.
And, when more than 0.10 % by weight, then can not obtain sufficient decarburization effect in decarburizing annealing technique, and because of phase transition phenomena secondary recrystallization set texture can be impaired, the magnetic property degradation phenomena causing magnetic aging to cause.
[S:0.010 less than % by weight]
S reacts with Mn and forms the important element of MnS.
When S content is more than 0.01 % by weight, the precipitate of MnS is formed in the growth that can suppress crystal grain in slab, and can segregate to slab central part during casting, is difficult to control the microtextured of subsequent technique.
Below, the present invention is further described by embodiment.
[embodiment 1]
Slab comprises the Si of 3.18%, C, the Mn of 0.11%, S, the N of 0.0051%, the Al of 0.028% of 0.0052% of 0.056% in % by weight, and surplus is Fe and other inevitable impurity.At slab reheating temperature 1150 DEG C, by this heating of plate blank 180 minutes, then carry out hot rolling to be rolled into the hot-rolled sheet that thickness is 2.3mm.This hot-rolled sheet is heated to after more than 1100 DEG C, keeps 90 seconds at 910 DEG C, and cool fast in water, carry out cold rolling with the thickness of 0.30mm after pickling.Be keep 180 seconds in the hydrogen of the humidity of 870 DEG C, nitrogen and ammonia gas mixture body atmosphere in temperature by cold-reduced sheet, and carry out decarburization and nitrogenize annealing simultaneously, make nitrogen content become 200ppm.Carry out under the mixed atmosphere of secondary recrystallization annealing 25% nitrogen+75% hydrogen when being warming up to 1200 DEG C, and carry out purifying annealing at 1200 DEG C.
For confirming the effect applying electric field when carrying out purifying annealing, under the state that electrode making alive applies electric field, detecting and changing according to the iron loss of purifying annealing time.
As shown in table 1, when carrying out purifying annealing, when applying size is the electric field of 2kV/cm, purifying annealing time will shorten.According to the general purification annealing thermal treatment not applying electric field, anneal after 30 hours, iron loss is 0.95W/k (contrast material 9), but when carrying out purifying annealing after applying an electric field, anneal after 18 hours, iron loss is 0.89W/kg (invention material 6), and iron loss is extremely outstanding.
[embodiment 2]
Slab comprises the Si of 3.16%, C, the Mn of 0.98%, S, the N of 0.0049%, the acid-solubility Al of 0.028% of 0.0052% of 0.053% in weight percent (%), and surplus is Fe and other inevitable impurity.At slab reheating temperature 1150 DEG C, by this heating of plate blank 180 minutes, then carry out hot rolling to be rolled into the hot-rolled sheet that thickness is 2.3mm.This hot-rolled sheet is heated to after more than 1100 DEG C, keeps 90 seconds at 910 DEG C, and cool fast in water, carry out cold rolling with the thickness of 0.30mm after pickling.Be keep 180 seconds in the hydrogen of the humidity of 870 DEG C, nitrogen and ammonia gas mixture body atmosphere in temperature by cold-reduced sheet, and carry out decarburization and nitrogenize annealing simultaneously, make nitrogen content be 200ppm.Carry out under the mixed atmosphere of secondary recrystallization annealing 25% nitrogen+75% hydrogen when being warming up to 1200 DEG C, and carry out purifying annealing at 1200 DEG C.
For confirming the impact of the direction of an electric field applied when carrying out purifying annealing, under the state applying positive and negative electrode electrode voltage, carrying out purifying annealing, then detect iron loss.
[table 2]
As shown in table 2, when carrying out purifying annealing, when purifying annealing time is identical, the iron loss applying external electrical field is less.Even if change the polarity of outer electrode, apply negative or positive electrode voltage and come conversion field direction, its effect difference is also little, and whether the applying of electric field has considerable influence to improving iron loss.
Above, be illustrated embodiments of the invention, but be understood by those skilled in the art that, when not changing technological thought or essential feature, the present invention can otherwise implement.
Therefore, above-described embodiment is exemplary and nonrestrictive.Protection scope of the present invention should be as the criterion with claims but not above-mentioned explanation, and all changes of being derived by the implication of claims, scope and such equivalents or the form of change, all drop on protection scope of the present invention.
Claims (5)
1. a manufacture method for oriented electrical steel, comprising:
There is provided electrical sheet slab, described electrical sheet slab comprises the Si of 2.0 ~ 6.5% in weight percent (%), and surplus is Fe and other inevitable impurity;
Described slab is reheated;
Described slab is rolled into hot-rolled steel sheet;
By cold rolling for described hot-rolled steel sheet one-tenth cold-rolled steel sheet;
Primary recrystallization annealing is carried out to described cold-rolled steel sheet; And
Secondary recrystallization annealing is carried out to the electrical sheet after described primary recrystallization annealing;
Wherein, described secondary recrystallization annealing carries out under the state applying electric field.
2. the manufacture method of oriented electrical steel according to claim 1, wherein,
Described secondary recrystallization annealing comprises temperature rise period and purifying annealing stage, and described purifying annealing is carried out under the state applying electric field.
3. the manufacture method of oriented electrical steel according to claim 2, wherein,
The size of described electric field is 1kV/cm ~ 3kV/cm.
4. the manufacture method of oriented electrical steel according to claim 3, also comprises:
After described rolling hot-rolling steel plate, at the temperature more than 900 DEG C, hot-rolled sheet is annealed.
5. the manufacture method of the oriented electrical steel according to any one in Claims 1-4, wherein,
Described slab also comprises Al, the Mn (not comprising 0%) of less than 0.20%, N, the C of 0.01 ~ 0.10%, the S (not comprising 0%) of less than 0.01% of less than 0.01% of 0.015 ~ 0.04%.
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| CN108474079A (en) * | 2015-12-22 | 2018-08-31 | Posco公司 | Oriented electrical steel and its manufacturing method |
| CN113228204A (en) * | 2018-12-19 | 2021-08-06 | Posco公司 | Oriented electrical steel sheet and method for manufacturing the same |
| CN113243034A (en) * | 2018-12-19 | 2021-08-10 | Posco公司 | Oriented electrical steel sheet and method for manufacturing the same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108474079A (en) * | 2015-12-22 | 2018-08-31 | Posco公司 | Oriented electrical steel and its manufacturing method |
| US10907231B2 (en) | 2015-12-22 | 2021-02-02 | Posco | Grain-oriented electrical steel sheet and manufacturing method therefor |
| CN108474079B (en) * | 2015-12-22 | 2021-06-15 | Posco公司 | Oriented electrical steel sheet and method for manufacturing the same |
| CN113228204A (en) * | 2018-12-19 | 2021-08-06 | Posco公司 | Oriented electrical steel sheet and method for manufacturing the same |
| CN113243034A (en) * | 2018-12-19 | 2021-08-10 | Posco公司 | Oriented electrical steel sheet and method for manufacturing the same |
| CN113228204B (en) * | 2018-12-19 | 2024-01-16 | 浦项股份有限公司 | Oriented electrical steel sheet and method for manufacturing same |
| CN113243034B (en) * | 2018-12-19 | 2024-06-04 | 浦项股份有限公司 | Oriented electrical steel sheet and method for manufacturing same |
Also Published As
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| KR101594598B1 (en) | 2016-02-16 |
| KR20150073797A (en) | 2015-07-01 |
| CN104726760B (en) | 2017-04-12 |
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