WO2019239868A1 - 薄肉鋳片の製造方法 - Google Patents
薄肉鋳片の製造方法 Download PDFInfo
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- WO2019239868A1 WO2019239868A1 PCT/JP2019/020853 JP2019020853W WO2019239868A1 WO 2019239868 A1 WO2019239868 A1 WO 2019239868A1 JP 2019020853 W JP2019020853 W JP 2019020853W WO 2019239868 A1 WO2019239868 A1 WO 2019239868A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
- B22D11/0682—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting wheel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
Definitions
- the present invention relates to a method for manufacturing a thin-walled slab by supplying molten steel to a molten steel pool portion formed by a pair of cooling drums and a pair of side weirs to manufacture a thin-walled slab.
- a device for producing thin metal slabs has a pair of cooling drums that have a water-cooling structure inside and rotate in opposite directions to each other. Supply, form and grow solidified shells on the peripheral surface of the cooling drum, and press-bond the solidified shells formed on the peripheral surfaces of the pair of cooling drums at the drum kiss point to produce a thin slab of a predetermined thickness
- a twin-drum type continuous casting apparatus is provided. Such a twin drum type continuous casting apparatus is applied to various metals.
- molten steel is continuously supplied from a tundish disposed above the cooling drum to the molten steel pool through an immersion nozzle and rotates.
- the molten steel is solidified and grown on the peripheral surface of the cooling drum to form a solidified shell, and the solidified shell formed on the peripheral surface of each cooling drum is pressed at the drum kiss point to produce a thin slab.
- the solidified structure has columnar crystals from the surface layers on both sides to 1/2 thickness part.
- equiaxed crystals may be formed in the 1 ⁇ 2 thick part.
- Patent Document 1 it has been aimed to actively generate equiaxed crystals in order to homogenize a metal structure.
- Patent Document 2 in a method of casting an austenitic stainless steel strip slab by a continuous casting apparatus in which the mold wall moves in synchronization with the slab, Ni negative segregation is achieved by controlling the pressing force of the mold wall surface.
- a manufacturing method that suppresses the occurrence of spotting and prevents spotted and staggered luster unevenness seen in steel sheets after cold rolling and cold working.
- the liquid phase confined between the grains may be solidified and contracted to generate micropores.
- the micropore is a hole having a diameter of about 300 ⁇ m to 100 ⁇ m, and has a bad influence on mechanical properties such as strength and toughness by being a starting point of fracture during processing.
- the solidified shells made of columnar crystals are pressure-bonded, the liquid phase is discharged and the columnar crystals are brought into close contact with each other, so that micropores are not generated. Therefore, from the viewpoint of preventing the deterioration of mechanical properties due to micropores, a thin cast slab having a low equiaxed crystal ratio and a high columnar crystal ratio is desired.
- This invention is made in view of the situation mentioned above, Comprising: It provides the manufacturing method of the thin-walled slab which can manufacture stably the thin-walled slab with a high columnar crystal ratio over the whole area of a slab. Objective.
- molten steel is supplied to a molten steel reservoir formed by a pair of rotating cooling drums and a pair of side weirs, and a solidified shell is formed and grown on the peripheral surface of the cooling drum to form a thin cast slab.
- a method for manufacturing a thin-walled slab to be manufactured wherein a pressing force P (kgf / mm) of a pair of the cooling drums, a casting thickness D (mm), and a radius R (m) of the cooling drum are 0.90 ⁇
- the pressing force P of the pair of cooling drums is set so as to satisfy P ⁇ (D ⁇ R) 0.5 ⁇ 1.30.
- P ⁇ (D ⁇ R) 0.5 defined by the pressing force P of the cooling drum, the casting thickness D (mm), and the radius R (m) of the cooling drum. Is set to 1.30 or less, the excessive pressing force P of the drum is suppressed, and the generation and growth of equiaxed crystals can be suppressed. Therefore, it is possible to manufacture a thin cast slab with less equiaxed crystals over the entire area.
- P ⁇ (D ⁇ R) 0.5 is 0.90 or more, the solidified shells can be securely bonded to each other, and a thin cast slab can be manufactured stably.
- the pressing force P of the pair of cooling drums is set in consideration of the casting thickness D (mm) and the cooling drum radius R (m), the actual pressing state can be stabilized.
- FIG. 1 It is a schematic explanatory drawing of the twin drum type continuous casting apparatus used when implementing the manufacturing method of the thin cast slab which is embodiment of this invention. It is an expansion explanatory view of the twin drum type continuous casting apparatus shown in FIG.
- rolling by a rolling roll it is a figure explaining the relationship between the contact length of a rolling roll and a to-be-rolled material, the rolling roll radius, and the plate
- the crystal nuclei are retained by pressure bonding and squeezing of the solidified shell due to the pressing of the cooling drum, and the crystal nuclei coalesce and grow, and this is between the solidified shells It becomes an equiaxed crystal.
- the solidified shell is pressure-bonded by pressing the cooling drum, if the pressing force is excessive, the tip of the solidified shell is broken by the reduction and crystal nuclei are generated. Then, the crystal nuclei are retained by pressing and drawing the solidified shell by pressing the cooling drum, and the crystal nuclei coalesce and grow, and these are entangled between the solidified shells to form equiaxed crystals.
- the factor that promotes the formation and growth of equiaxed crystals is the excessive crimping of the solidified shell due to the pressing of the cooling drum, and the pressing condition of the cooling drum is optimized.
- the generation and growth of equiaxed crystals can be suppressed.
- the outer diameter (drum diameter) of the cooling drum is large, the pressure bonding of the solidified shell becomes closer to flat plate compression, and the drawing up and breakage due to the pressure bonding become excessive. For this reason, when the drum diameter is large, it is necessary to keep the pressing force of the drum low.
- the peripheral speed of the cooling drum becomes slower and a large number of free crystal nuclei are generated. Furthermore, since the temperature gradient at the interface between the solidified shell and the molten steel becomes smaller and the fragile part at the tip of the solidified shell becomes thicker, breakage due to pressing becomes excessive. For this reason, when the solidified shell thickness (that is, the casting thickness) is large, it is necessary to keep the pressing force of the drum low.
- the thin cast slab 1 manufactured in the present embodiment may be used for automotive steel plates, corrosion / weather resistant steel plates, welded pipes, directional electrical steel plates, non-oriented electrical steel plates, and the like.
- the width of the thin cast slab 1 to be manufactured is in the range of 300 mm to 2000 mm, and the thickness is in the range of 1 mm to 5 mm.
- the twin-drum continuous casting apparatus 10 in the present embodiment includes a pair of cooling drums 11, 11, bender rolls 12, 12 that bend the thin cast piece 1, and a pinch that supports the thin cast piece 1.
- Rolls 13, 13, side weirs 15 disposed at the ends in the width direction of the pair of cooling drums 11, 11, and a molten steel pool 16 defined by the pair of cooling drums 11, 11 and the side weirs 15.
- a dipping nozzle 18 for supplying the molten steel 3 from the tundish 17 to the molten steel pool portion 16.
- FIG. 2 shows an enlarged explanatory view around the molten steel pool 16 in FIG.
- a chamber 20 is disposed above the molten steel pool 16 and the cooling drums 11 and 11.
- the molten steel 3 is supplied from the tundish 17 through the immersion nozzle 18 to the molten steel pool portion 16 formed by the pair of cooling drums 11 and 11 and the side weir 15, and the pair of cooling drums 11 and 11 are moved in the rotation direction F.
- Each of the cooling drums 11 and 11 is rotated so that the region where the pair of cooling drums 11 and 11 are close to each other is directed in the drawing direction of the thin cast slab 1 (downward in FIG. 1).
- the solidified shell 5 is formed on the peripheral surface of the cooling drum 11. Then, the solidified shell 5 grows on the peripheral surface of the cooling drum 11, and the solidified shells 5 and 5 formed on the pair of cooling drums 11 and 11, respectively, are pressure-bonded at the drum kiss point KP. A thin slab 1 is cast.
- the pressing force P (kgf / mm) at the drum kiss point KP between the pair of cooling drums 11 and 11 is used as the casting thickness D (mm) and the radius R (m) of the cooling drum 11.
- the rules are as follows. 0.90 ⁇ P ⁇ (D ⁇ R) 0.5 ⁇ 1.30
- the contact length L increases even when pressed with the same reduction force, and the rolling efficiency increases.
- ( ⁇ h ⁇ R) It is necessary to reduce the pressing force with an increase of 0.5 .
- the reduction amount ⁇ h of the sheet thickness due to rolling is approximately proportional to the casting thickness D.
- the radius R of the rolling roll corresponds to the radius R of the cooling drum 11.
- the index indicating the degree of pressure bonding of the solidified shell 5 and the degree of breakage of the solidified shell 5 leading to the formation of equiaxed crystals are the pressing force P and (D XR) 0.5 product P x (D x R) 0.5 .
- Px (D xR) 0.5 the index indicating the degree of pressure bonding of the solidified shell 5 and the degree of breakage of the solidified shell 5 leading to the formation of equiaxed crystals.
- P ⁇ (D ⁇ R) 0.5 is set in the range of 0.90 to 1.30.
- the upper limit of P ⁇ (D ⁇ R) 0.5 is preferably 1.1 or less.
- the cooling drum 11 is rotated every 10 revolutions (for example, the radius R of the cooling drum 11) throughout the entire thin slab 1.
- the thickness is 0.3 m
- the entire width of the thin cast slab 1 is sampled at a pitch of 18.8 m)
- the metal structure of the entire cross section in the width direction excluding 20 mm at both ends as a trim margin is observed, the thin cast
- the minimum value of the ratio of the columnar crystal thickness to the thickness of the piece 1 exceeds 95%.
- the pressing force P of the pair of cooling drums 11 and 11 is set in consideration of the casting thickness D (mm) and the radius R (m) of the cooling drum 11, the actual pressing state can be stabilized. It becomes possible. Therefore, the thin cast piece 1 with few equiaxed crystals can be stably manufactured over the entire area of the thin cast piece 1.
- the minimum value of the ratio of the columnar crystal thickness to the thickness of the thin cast 1 is over 95% as described above. Therefore, it is possible to prevent the mechanical properties from being deteriorated due to the micropores.
- Example 1 Using the twin-drum continuous casting apparatus described in the embodiment, a thin-walled casting made of a steel material containing C: 0.02 mass%, Si: 3.5 mass%, Al: 0.6 mass%, Mn: 0.2 mass% The piece was cast under the conditions shown in Table 1. The drum width was 400 mm.
- the casting situation was evaluated visually.
- the evaluation results are shown in Table 1 and FIG.
- the columnar crystal ratio of the obtained thin cast piece was measured.
- the entire width of the thin slab is sampled at every 10 rotations of the cooling drum (for example, 18.8 m pitch when the cooling drum radius R is 0.3 m) over the entire thin slab,
- the metal structure of the entire cross section in the width direction except 20 mm was observed, and the minimum value of the ratio of the columnar crystal thickness to the plate thickness was defined as the columnar crystal ratio in the casting.
- the evaluation results are shown in Table 1 and FIG.
- Table 1 shows the average size and number density of the micropores. From the thin slab, a sample having a full width was taken for one rotation of the cooling drum, and an X-ray transmission photograph was taken from the plate surface direction of the thin slab. Then, two-dimensional image processing was performed on the micropores observed as white spots, and the average size ( ⁇ m) and number density (pieces / m 2 ) of the micropores were measured.
- Examples 1 to 8 of the present invention in which P ⁇ (D ⁇ R) 0.5 is an appropriate range, the casting can be stably performed and the columnar crystal ratio is high over the entire slab. As a result, it was confirmed that micropores could be prevented.
- the present invention it is possible to provide a method for producing a thin-walled slab that can stably produce a thin-walled slab having a high columnar crystal ratio over the entire area of the slab.
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Abstract
Description
本願は、2018年6月12日に、日本に出願された特願2018-111919号に基づき優先権を主張し、その内容をここに援用する。
従来、一般的には、例えば特許文献1に示すように、金属組織を均質化するために、等軸晶を積極的に生成することが志向されている。
一方、柱状晶からなる凝固シェル同士を圧着させると、液相が排出されて柱状晶同士が密着するためマイクロポアが発生しない。従って、マイクロポアに起因する機械特性の低下を防ぐ観点からは、等軸晶率が低く、柱状晶率が高い薄肉鋳片が望まれている。
連続鋳造する薄肉鋳片において、マイクロポアに起因する欠陥箇所が生じると、その対策として、薄肉鋳片にさらなる熱間圧延などを加えて、マイクロポアを圧着する必要がある。その工程増加により、生産効率を著しく低下させることになる。このため、全域にわたって柱状晶率が高く安定した薄肉鋳片が望まれていた。
一方、P×(D×R)0.5が0.90以上とされているので、凝固シェル同士を確実に圧着することができ、安定して薄肉鋳片を製造することが可能となる。
また、鋳造厚さD(mm)、冷却ドラムの半径R(m)を考慮して一対の冷却ドラムの押し付け力Pを設定しているので、実際の押し付け状況を安定させることが可能となる。
(1)溶鋼とドラム表面の接触部(メニスカス)において生成した凝固核が、溶鋼流動によってドラム表面から剥離して結晶核となり、ドラム回転に伴って溶鋼溜まり部の下方に移動する。ここで、一対の冷却ドラムの押し付け力が一定値を上回ると、冷却ドラムの押し付けによる凝固シェルの圧着、絞り上げよって結晶核が滞留し、結晶核同士が合体して成長し、これが凝固シェル間に巻き込まれて等軸晶となる。
(2)冷却ドラムの押し付けによって凝固シェルが圧着される際に、押し付け力が過剰な場合には、圧下によって凝固シェルの先端が折損し、結晶核が発生する。そして、冷却ドラムの押し付けによる凝固シェルの圧着、絞り上げよって結晶核が滞留し、結晶核同士が合体して成長し、これが凝固シェル間に巻き込まれて等軸晶となる。
ここで、冷却ドラムの外径(ドラム径)が大きいと、凝固シェルの圧着はより平板圧縮に近くなり、圧着による絞り上げや折損がより過剰となる。このため、ドラム径が大きい場合には、ドラムの押し付け力を低く抑える必要がある。
また、鋳造厚さに対応する凝固シェル厚が厚いと、冷却ドラムの周速度がより遅くなり、遊離結晶核が多数生成する。さらに、凝固シェルと溶鋼の界面の温度勾配がより小さくなり、凝固シェル先端の脆弱な部分がより厚くなるため、押し付けによる折損が過剰となる。このため、凝固シェル厚(すなわち鋳造厚さ)が厚い場合には、ドラムの押し付け力を低く抑える必要がある。
本実施形態において製造される薄肉鋳片1は、自動車用鋼板、耐食・耐候性鋼板、溶接管、方向性電磁鋼板、無方向性電磁鋼板等に用いられてもよい。
また、本実施形態では、製造される薄肉鋳片1の幅が300mm以上2000mm以下の範囲内、厚さが1mm以上5mm以下の範囲内とされている。
0.90≦P×(D×R)0.5≦1.30
一般に、圧延理論においては、圧延ロールによる圧延の場合、図3に示すように、ロールと圧延材の接触長さLと、圧延ロール半径Rと、圧延による板厚の減少量Δhとの関係は、
L=(Δh×R)0.5
で表される。
本実施形態の双ドラム式連続鋳造装置10においては、圧延による板厚の減少量Δhは鋳造厚さDに概ね比例する。また、圧延ロールの半径Rは冷却ドラム11の半径Rに相当する。このため、本実施形態の双ドラム式連続鋳造装置10において、凝固シェル5の圧着の度合いや、等軸晶の生成に繋がる凝固シェル5の折損の度合いを示す指標は、押し付け力Pと(D×R)0.5の積P×(D×R)0.5で示される。そして、全域にわたって安定して等軸晶の発生及び成長を抑制するとともに、凝固シェル5、5同士を確実に圧着するために、上述のP×(D×R)0.5の適正な範囲を規定した。
すなわち、ドラム半径R(mm)と鋳造厚さD(mm)の積のルートである(D×R)0.5を指標として押し付け力Pを制御することで、ドラムキス点KPにおける凝固シェル5、5への力の伝わり方を適切にすることができ、等軸晶の発生及び成長を抑制することができる。
一方、P×(D×R)0.5が0.90を下回ると、凝固シェル5、5同士を十分に圧着できないおそれがある。
以上のことから、本実施形態においては、P×(D×R)0.5を0.90以上1.30以下の範囲内に設定している。
なお、等軸晶が発生及び成長をさらに抑制するためには、P×(D×R)0.5の上限を1.1以下とすることが好ましい。
また、鋳造厚さD(mm)、冷却ドラム11の半径R(m)を考慮して一対の冷却ドラム11、11の押し付け力Pを設定しているので、実際の押し付け状況を安定させることが可能となる。
よって、薄肉鋳片1の全域にわたって等軸晶の少ない薄肉鋳片1を安定して製造することができる。
例えば、本実施形態では、図1に示すように、ベンダーロール及びピンチロールを配設した双ドラム式連続鋳造装置を例に挙げて説明したが、これらのロール等の配置に限定はなく、適宜設計変更してもよい。
以下に、本発明の効果を確認すべく、実施した実験結果について説明する。
実施形態で説明した双ドラム式連続鋳造装置を用いて、C;0.02mass%、Si;3.5mass%、Al;0.6mass%、Mn;0.2mass%を含有する鋼材からなる薄肉鋳片を、表1に示す条件で鋳造した。なお、ドラム幅は400mmとした。
そして、得られた薄肉鋳片の柱状晶率を測定した。薄肉鋳片の全域にわたり、冷却ドラムの10回転毎(例えば冷却ドラムの半径Rが0.3mの場合は、18.8mピッチ)で、薄肉鋳片の全幅をサンプリングし、トリム代となる両端各20mmを除く幅方向の全断面の金属組織を観察し、板厚に占める柱状晶厚の比率の最小値を、その鋳造における柱状晶率とした。評価結果を表1及び図5に示す。
比較例5~9においては、P×(D×R)0.5の値が1.30よりも大きく、等軸晶の発生及び成長を十分に抑制することができず、柱状晶率が低くなった。また、マイクロポアが多数生成した。
3 溶鋼
5 凝固シェル
11 冷却ドラム
Claims (1)
- 回転する一対の冷却ドラムと一対のサイド堰によって形成された溶鋼溜まり部に溶鋼を供給し、前記冷却ドラムの周面に凝固シェルを形成及び成長させて薄肉鋳片を製造する薄肉鋳片の製造方法であって、
一対の前記冷却ドラムの押し付け力P(kgf/mm)、鋳造厚さD(mm)、前記冷却ドラムの半径R(m)が、
0.90≦P×(D×R)0.5≦1.30
を満足するように、前記一対の前記冷却ドラムの押し付け力Pを設定することを特徴とする薄肉鋳片の製造方法。
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US17/054,977 US11618072B2 (en) | 2018-06-12 | 2019-05-27 | Thin strip manufacture method |
JP2020525403A JP6874908B2 (ja) | 2018-06-12 | 2019-05-27 | 薄肉鋳片の製造方法 |
CN201980037880.0A CN112236248B (zh) | 2018-06-12 | 2019-05-27 | 薄壁铸板的制造方法 |
KR1020207034882A KR102448623B1 (ko) | 2018-06-12 | 2019-05-27 | 박육 주조편의 제조 방법 |
BR112020023221-1A BR112020023221A2 (pt) | 2018-06-12 | 2019-05-27 | método de produção de tira fina |
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KR100489018B1 (ko) * | 2002-08-30 | 2005-05-11 | 주식회사 포스코 | 쌍롤형 박판 주조기를 이용한 고망간강의 박판 제조 방법 |
CN102015155B (zh) * | 2008-03-19 | 2013-11-27 | 纽科尔公司 | 使用铸辊定位的带材铸造设备 |
US20090288798A1 (en) * | 2008-05-23 | 2009-11-26 | Nucor Corporation | Method and apparatus for controlling temperature of thin cast strip |
CN102069165B (zh) * | 2010-11-11 | 2013-03-13 | 东北大学 | 一种双辊薄带连铸制备无取向硅钢柱状晶薄带坯的方法 |
JP6645214B2 (ja) * | 2016-01-28 | 2020-02-14 | 日本製鉄株式会社 | 低炭素鋼薄肉鋳片の製造方法および低炭素鋼薄肉鋳片、並びに低炭素鋼薄鋼板の製造方法 |
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2019
- 2019-05-27 WO PCT/JP2019/020853 patent/WO2019239868A1/ja active Application Filing
- 2019-05-27 BR BR112020023221-1A patent/BR112020023221A2/pt active Search and Examination
- 2019-05-27 US US17/054,977 patent/US11618072B2/en active Active
- 2019-05-27 CN CN201980037880.0A patent/CN112236248B/zh active Active
- 2019-05-27 TW TW108118231A patent/TW202000339A/zh unknown
- 2019-05-27 JP JP2020525403A patent/JP6874908B2/ja active Active
- 2019-05-27 KR KR1020207034882A patent/KR102448623B1/ko active IP Right Grant
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JPS626739A (ja) * | 1985-07-02 | 1987-01-13 | Nisshin Steel Co Ltd | 溶鋼の薄板連鋳装置 |
JPH0263650A (ja) * | 1988-08-30 | 1990-03-02 | Nisshin Steel Co Ltd | オーステナイト系ステンレス鋼帯の製造方法 |
JPH08215797A (ja) * | 1995-02-16 | 1996-08-27 | Nippon Steel Corp | 表面性状および成形性の優れたオーステナイト系ステンレス鋼薄肉鋳片の製造方法 |
JP2003285141A (ja) * | 2002-03-27 | 2003-10-07 | Nippon Steel Corp | オーステナイト系ステンレス鋼薄帯状鋳片の製造方法 |
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BR112020023221A2 (pt) | 2021-02-23 |
US20210213515A1 (en) | 2021-07-15 |
TW202000339A (zh) | 2020-01-01 |
CN112236248B (zh) | 2022-06-03 |
JPWO2019239868A1 (ja) | 2021-02-18 |
KR20210005250A (ko) | 2021-01-13 |
JP6874908B2 (ja) | 2021-05-19 |
CN112236248A (zh) | 2021-01-15 |
KR102448623B1 (ko) | 2022-09-28 |
US11618072B2 (en) | 2023-04-04 |
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