WO2013051232A1 - 連続熱間圧延におけるシートバーの接合方法 - Google Patents
連続熱間圧延におけるシートバーの接合方法 Download PDFInfo
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- WO2013051232A1 WO2013051232A1 PCT/JP2012/006282 JP2012006282W WO2013051232A1 WO 2013051232 A1 WO2013051232 A1 WO 2013051232A1 JP 2012006282 W JP2012006282 W JP 2012006282W WO 2013051232 A1 WO2013051232 A1 WO 2013051232A1
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- WIPO (PCT)
- Prior art keywords
- sheet bar
- joining
- time
- upset
- bar
- Prior art date
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- 0 CC1O*C=*C1 Chemical compound CC1O*C=*C1 0.000 description 1
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/015—Butt welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/16—Bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Definitions
- the present invention relates to a method for joining sheet bars in continuous hot rolling, and more specifically, the leading end of a preceding sheet bar and the leading end of a succeeding sheet bar are heated using an induction heating device and pressed (upset) to join. Further, the present invention relates to a sheet bar joining method in continuous hot rolling, in which continuous joining and continuous rolling are performed.
- the induction heating pressure welding method disclosed in Patent Document 1 and Patent Document 2 is known as a method that can complete the bonding in a relatively short time.
- This method is a method of joining by heating rapidly a part to be joined between the rear end of the preceding sheet bar and the front end of the succeeding sheet bar by induction heating and then abutting (upsetting) each other.
- Patent Document 3 discloses a sheet that can prevent the vertical displacement of the sheet bar that has occurred during the butt joining of the sheet bar, breakage of the insulating material of the bonding apparatus, and the like and can perform stable continuous hot rolling.
- a bar joining apparatus and a joining method are disclosed.
- JP 60-244401 A Japanese Patent Laid-Open No. 08-001204 JP-A-10-286607
- the sheet bar joining method in the conventional continuous hot rolling has the following problems. That is, according to the analysis of past continuous rolling operation results, the sheet bar is mass%, C: 0.038 to 0.120%, Si: 0.01 to 1.40%, Mn: 0.80 to 1.40.
- composition C1 which is an unavoidable impurity, or in addition to the composition C1, Cu: 0.01 to 0.03%, Ni: 0.01 to 0.02%, Cr : 0.02 to 0.90%, Mo: 0.001 to 0.010%, V: 0.002 to 0.005%, Ti: 0.002 to 0.055%, Nb: 0.004% or less
- composition C2 containing one or more of the above, That the frequency of the joint is broken after bar finish rolling in to finish rolling there is a problem that high was found.
- the inventor diligently studied to solve the above-mentioned problems, and obtained the following knowledge.
- the above composition has a high upper limit of the amount of Si and Mn.
- the component element is easily exposed to the atmosphere by induction heating at the time of joining the sheet bar, and the component element has a high melting point (Si: 0.5% or more) because the melting point of the component element is lower than that of steel.
- / or Mn 1.0% or more
- the component element aggregates in liquid form and oxidizes at the sheet bar bonding interface at a high temperature to generate a large number of oxides of the component element.
- the above composition has a high upper limit for Al, Cr, and Ti.
- the component element forms an oxide in the molten steel in the steelmaking stage, and when the component content is high, the oxide of the component element remains in a large amount in the slab and also appears in a large amount at the sheet bar joint interface.
- C Since all of the oxides described in (a) and (b) are poor in ductility, if present in a large amount at the sheet bar bonding interface, the bonding strength of the sheet bar is lowered, and the bonded portion is caused by the tension during finish rolling. Cause breakage.
- D By sufficiently removing the oxide from the bonding interface during sheet bar bonding, the bonding strength can be improved, and the occurrence frequency of the breakage can be greatly reduced.
- the countermeasure of (d) is a low alloy steel (steel whose total amount of alloying elements is 5 mass% or less) having a composition other than the above-mentioned compositions C1 and C2 and a medium alloy steel ( It is also effective in the case of any steel grade of steels with a total amount of alloying elements of more than 5 mass% and less than 10 mass%) and high alloy steels (steels with a total amount of alloying elements of 10 mass% or more (including stainless steel)). is there.
- the present invention has been made based on the above findings, and the gist thereof is as follows. (1) Clamp the tail end of the preceding sheet bar and the leading end of the succeeding sheet bar at the entry side of the hot finish rolling mill, induction heating while starting upset, and releasing the clamp after reaching the target upset amount Sheet bar joining method, wherein the holding time after upsetting, which is the time from reaching the target upset amount to releasing the clamp, is 25% or more of the total joining time, which is the time from upset start to clamping release. 60% or less, The joining method of the sheet
- the sheet bar is, by mass, C: 0.038 to 0.120%, Si: 0.01 to 1.40%, Mn: 0.80 to 1.40%, P: 0.005. -0.024%, S: 0.001-0.054%, N: 0.002-0.005%, Al: 0.024-0.050%, the balance being Fe and inevitable impurities (1)
- the sheet bar has a composition of Si: 0.50 to 1.4% instead of Si: 0.01 to 1.4% in (2), or Mn: 0.80 to 1.40 in (2). Instead of%, the composition is Mn: 1.0 to 1.40%.
- the present invention in the joining process of joining the leading end of the preceding sheet bar and the leading end of the succeeding seat bar, it is possible to effectively eliminate the oxide at the seat bar joining interface, and greatly improve the seat bar joining strength. In addition, there is an effect that it is possible to effectively reduce the fracture of the joint in the next process, the finish rolling process (process from the start of finish rolling to the completion of winding).
- FIG. 1 is a schematic view showing an example of a continuous hot rolling line used in the practice of the present invention.
- FIG. 2 is a schematic view showing an example of the joining apparatus in FIG.
- FIG. 3 is a graph in which the limit line of equipment constraints is superimposed on the relationship diagram of the bonding strength ratio and the amount of upset by FEM analysis.
- FIG. 4 is a schematic view showing an example of a sheet bar joining portion joined by a joining method outside the scope of the present invention.
- FIG. 5 is a schematic view showing an example of a sheet bar joining portion joined by a joining method within the scope of the present invention.
- FIG. 1 is a schematic view showing an example of a continuous hot rolling line used in the practice of the present invention, and shows an equipment row from a coil box 1 to a finishing mill first stand 7.
- the equipment row includes a coil box 1 that winds up a plate (sheet bar) that is output from a roughing mill (not shown), a rear end of the preceding sheet bar S 1 that is unwound from the coil box 1, and a subsequent sheet bar S.
- a cropping shear 2 that cuts the front end of the sheet 2
- a joining device 3 that joins the cut surfaces (joint surfaces) of the preceding sheet bar S 1 and the succeeding sheet bar S 2
- a leveler 4 pinch rolls 5 a, 5 b, 5 c, descaling. It has an apparatus 6 and a finishing mill first stand 7.
- the joining device 3 uses the cutting end of the preceding sheet bar S 1 from which the trailing end crop is cut off by the crop shear 2 and the trailing sheet bar S 2 from which the leading end crop is cut off.
- the left and right clamping devices 8 and 9 that clamp (clamp) the joint surfaces so as to face each other in a non-contact manner, and the preceding sheet bar S 1 and the succeeding sheet bar S 2 gripped by the clamping devices 8 and 9.
- the induction heating device 10 for heating the cut end, the bonding faces of the preceding sheet bar S 1 and the cut end of the trailing sheet bar S 2, which is heated by the induction heating apparatus 10 by pressing the clamping device 8 to the clamp device 9 side a pressure cylinder 11 for pressing (upset) joined butt, this at the time of the upset and the preceding sheet bar S 1 and the succeeding sheet bar S 2 is shifted in the vertical direction It comprises a tongue and groove preventing plate 12 for preventing.
- the preceding sheet bar S 1 and the succeeding sheet bar S 2 each The joining surface was heated so that the solid fraction of the steel slab was 25%, and in this state, the clamping device 8 was pushed by 24 mm, that is, the upset amount was 24 mm, and the joining surfaces were upset. .
- both the oxide having a melting point higher than the melting point of the steel generated at the joining interface and the oxide having a melting point lower than the melting point of the steel are brought out from the joining interface together with the melted steel in the liquid phase. As a result of being discharged, it can be avoided that the oxide remains at the bonding interface and the bonding strength is lowered.
- FIG. 3 is a graph showing the correlation between the solid phase ratio and the amount of upset obtained by analyzing the joint behavior by the finite element method (FEM) and the joint strength ratio, which is the strength ratio of the joint to the base material. is there.
- FEM finite element method
- the solid phase ratio is lowered too much, the liquid phase increases and incomplete joining occurs due to melting of the steel pieces.
- the amount of upset is too large, the joining load is restricted on the equipment, and sufficient upset cannot be performed.
- the holding time after the upset needs to be 25% or more and 60% or less of the total bonding time.
- the ratio of the holding time after upsetting to the total joining time is preferably 60% or less because if this exceeds 60%, the effect of improving the joining strength is saturated and only the rolling efficiency is lowered.
- FIGS. 4 and 5 both clarify the joint by applying tension in the longitudinal direction of the sheet bar after joining the sheet bar having the solid phase ratio of 25% and the upset amount of 24 mm and having the composition C1.
- the holding time after upsetting is 0.5 seconds (11% of the total bonding time) with respect to the total bonding time of 4.5 seconds
- FIG. 5 shows that the bonding time is 4.7 seconds.
- the holding time after upsetting was 1.5 seconds (32% of the total bonding time).
- the joint fracture occurred during finish rolling.
- finish rolling was successfully completed.
- the joining rate in the sheet bar width direction is also greatly improved to 77% at a holding time of 1.5 seconds, compared to 36% at a holding time of 0.5 seconds.
- the ratio of the holding time after upsetting to the total joining time was 25% or more.
- the sheet bar width direction joining rate after joining was remarkably good, and it was grasped that even if finish-rolling as it is, it does not break at the joined part and can be rolled normally.
- the steel types listed in the compositions C1, C2 to (e) have a large amount of steel components such as Si and Mn, which are easily exposed to the atmosphere by induction heating and oxidized, and their melting points are Since it is lower than steel, it is produced in a large amount in the liquid state at the interface between the sheet bar and agglomerates into oxides.
- the ratio of the retention time after upsetting to the total bonding time is as low as less than 25%, some of these oxides remain at the bonding interface and solidify, and the oxides are not ductile. As a result, cracks develop in the entire width direction of the sheet bar and are easy to break.
- the oxide in which the liquid elements are aggregated can be sufficiently discharged from the bonding interface, so that the bonding interface can be sufficiently welded and the ductility is secured. Therefore, the finish rolling can be stably performed without breaking.
- sheet bars each having a width of 1100 mm and a thickness of 30 mm were subjected to the continuous hot rolling line shown in FIG.
- the steel type of the sheet bar is an alloy steel shown in Table 1 including Si, Mn, Cr, Ti and the like.
- the joining surfaces of the preceding sheet bar S 1 and the succeeding sheet bar S 2 are arranged to face each other, and then the joining surfaces are heated by the induction heating device 10, and the clamping device 8 is pushed by the upset cylinder 11 and joined. The surfaces were pressed (upset) until they reached the target upset amount shown in Table 2, and then held for the holding time after the upset shown in Table 2, and then the upset by the left and right clamping devices 8 and 9 was released.
- the ratio of the holding time after upsetting to the total bonding time was less than 25%, the bonding rate at the interface in the sheet bar width direction after bonding was 48% or less, and fracture occurred during finish rolling.
- the ratio of the holding time after upsetting to the total bonding time is 25% or more, and the bonding rate at the interface in the sheet bar width direction after bonding is 68% or more. It did not break at all.
Abstract
Description
(ア) 上記組成はSi、Mn量の上限が高い。当該成分元素はシートバー接合時の誘導加熱によって大気に曝され酸化し易くて、当該成分元素の融点は鋼のそれよりも低いことから、当該成分含有量が高い(Si:0.5%以上、及び/又は、Mn:1.0%以上である)場合、高温でのシートバー接合界面に当該成分元素が液状に凝集して酸化され当該成分元素の酸化物が多数生成する。
(イ) 上記組成はAl,Cr,Tiの上限が高い。当該成分元素は製鋼段階で溶鋼中に酸化物を形成し、当該成分含有量が高い場合、当該成分元素の酸化物は鋳片内に多量に残留し、シートバー接合界面にも多量に現れる。
(ウ) (ア)(イ)で述べた酸化物は、何れも延性に乏しい為、シートバー接合界面に多量に存在すると、シートバーの接合強度を低下させ、仕上圧延中の張力により接合部破断の原因となる。
(エ) 上記酸化物をシートバー接合中に接合界面から十分に排除する事により、接合強度を向上させる事ができて、上記破断の発生頻度を大幅に低減できる。その為にはシートバー接合工程において、接合全時間に対してアプセット後にそのままの状態に保持する時間の割合を適正に管理する対策が非常に有効である。
(オ) (エ)の対策は、被接合材であるシートバーが、前記組成C1,C2以外の組成を有する低合金鋼(合金元素の総量が5mass%以下である鋼)、中合金鋼(合金元素の総量が5mass%超10mass%未満である鋼)、高合金鋼(合金元素の総量が10mass%以上である鋼(ステンレス鋼を含む))の何れかの鋼種である場合にも有効である。
(1)熱間仕上圧延機の入側で先行シートバーの尾端と後行シートバーの先端をクランプして、アプセットを開始しつつ誘導加熱し、目標アプセット量に達した後、クランプを開放するシートバー接合方法であって、前記目標アプセット量に達してからクランプを開放するまでの時間であるアプセット後の保持時間を、アプセット開始からクランプ開放までの時間である接合全時間の25%以上60%以下とすることを特徴とする熱間連続圧延におけるシートバーの接合方法。
(2)前記シートバーは、質量%で、C:0.038~0.120%、Si:0.01~1.40%、Mn:0.80~1.40%、P:0.005~0.024%、S:0.001~0.054%、N:0.002~0.005%、Al:0.024~0.050%を含有し残部Fe及び不可避的不純物である組成を有することを特徴とする(1)に記載の熱間連続圧延におけるシートバーの接合方法。
(3)前記Feの一部に代えて、質量%で、Cu:0.01~0.03%、Ni:0.01~0.02%、Cr:0.02~0.90%、Mo:0.001~0.010%、V:0.002~0.005%、Ti:0.002~0.055%、Nb:0.004%以下のうちの1種又は2種以上を含有することを特徴とする(2)に記載の熱間連続圧延におけるシートバーの接合方法。
2 クロップシャー
3 接合装置
4 レベラー
5 ピンチロール
6 脱スケール装置
7 仕上圧延機第1スタンド
8 入側クランプ装置
9 出側クランプ装置
10 誘導加熱装置
11 アプセットシリンダ
12 目違い防止板
Claims (3)
- 熱間仕上圧延機の入側で先行シートバーの尾端と後行シートバーの先端をクランプして、アプセットを開始しつつ誘導加熱し、目標アプセット量に達した後、クランプを開放するシートバー接合方法であって、前記目標アプセット量に達してからクランプを開放するまでの時間であるアプセット後の保持時間を、アプセット開始からクランプ開放までの時間である接合全時間の25%以上60%以下とすることを特徴とする熱間連続圧延におけるシートバーの接合方法。
- 前記シートバーは、質量%で、C:0.038~0.120%、Si:0.01~1.40%、Mn:0.80~1.40%、P:0.005~0.024%、S:0.001~0.054%、N:0.002~0.005%、Al:0.024~0.050%を含有し残部Fe及び不可避的不純物である組成を有することを特徴とする請求項1に記載の熱間連続圧延におけるシートバーの接合方法。
- 前記Feの一部に代えて、質量%で、Cu:0.01~0.03%、Ni:0.01~0.02%、Cr:0.02~0.90%、Mo:0.001~0.010%、V:0.002~0.005%、Ti:0.002~0.055%、Nb:0.004%以下のうちの1種又は2種以上を含有することを特徴とする請求項2に記載の熱間連続圧延におけるシートバーの接合方法。
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CN201280048629.2A CN103842104B (zh) | 2011-10-03 | 2012-10-01 | 热连轧中的薄板坯的接合方法 |
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JP3063608B2 (ja) * | 1996-02-23 | 2000-07-12 | 日本鋼管株式会社 | 熱鋸切断式連続圧延法および装置 |
JP4106717B2 (ja) | 1997-04-15 | 2008-06-25 | Jfeスチール株式会社 | 鋼片の接合装置および接合方法 |
JP2002346623A (ja) * | 2002-04-08 | 2002-12-03 | Mitsubishi Heavy Ind Ltd | 連続熱間圧延設備 |
JP7063724B2 (ja) | 2018-05-25 | 2022-05-09 | トヨタ自動車株式会社 | 燃料電池システム用の排気排水ユニット |
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2012
- 2012-10-01 KR KR1020147008502A patent/KR101580589B1/ko not_active IP Right Cessation
- 2012-10-01 CN CN201280048629.2A patent/CN103842104B/zh not_active Expired - Fee Related
- 2012-10-01 WO PCT/JP2012/006282 patent/WO2013051232A1/ja active Application Filing
- 2012-10-01 JP JP2013537407A patent/JP5648750B2/ja active Active
Patent Citations (4)
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JPS60244401A (ja) * | 1984-05-21 | 1985-12-04 | Hitachi Ltd | 熱間鋼片の連続熱間圧延方法及び装置 |
JPH08155504A (ja) * | 1994-11-30 | 1996-06-18 | Hitachi Ltd | 材料の接合方法及び接合装置 |
JP2002047536A (ja) * | 2000-02-23 | 2002-02-15 | Kawasaki Steel Corp | 歪時効硬化特性に優れた高張力熱延鋼板およびその製造方法 |
JP2005118886A (ja) * | 2004-12-06 | 2005-05-12 | Jfe Steel Kk | 薄物熱延鋼板の製造方法 |
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CN103842104B (zh) | 2016-03-02 |
KR20140068123A (ko) | 2014-06-05 |
KR101580589B1 (ko) | 2015-12-28 |
JPWO2013051232A1 (ja) | 2015-03-30 |
JP5648750B2 (ja) | 2015-01-07 |
CN103842104A (zh) | 2014-06-04 |
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