CN111344075B - Steel sheet, method for producing same, and secondary cold rolling mill - Google Patents
Steel sheet, method for producing same, and secondary cold rolling mill Download PDFInfo
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- CN111344075B CN111344075B CN201880073450.XA CN201880073450A CN111344075B CN 111344075 B CN111344075 B CN 111344075B CN 201880073450 A CN201880073450 A CN 201880073450A CN 111344075 B CN111344075 B CN 111344075B
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- 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
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Abstract
The invention provides a steel sheet with excellent damage resistance, a manufacturing method thereof and a secondary cold rolling mill. The HR30T hardness of the steel sheet of the present invention is 68 or more, and the 20-degree specular gloss is 120 or less. The steel sheet is produced by hot rolling a slab, then performing a first cold rolling and annealing, and then performing a second cold rolling using a bright roll having an arithmetic average roughness Ra of 0.15 to 0.25 μm and a matte roll having an arithmetic average roughness Ra of 1.5 to 3.0 μm and a PPI of 250 or more.
Description
Technical Field
The present invention relates to a steel sheet having excellent flaw resistance, a method for producing the same, and a secondary cold rolling mill.
Background
In general, cold-rolled steel sheets are manufactured by hot-rolling a steel slab, then cold-rolling the steel slab, annealing the steel slab, and temper-rolling the steel slab with a reduction of about 0.5% to 3.0%. This temper rolling is performed for the purpose of eliminating the yield point elongation of the steel sheet after annealing, adjusting the surface roughness, correcting the shape, adjusting the surface hardness, and the like, and hardly contributes to thinning of the steel sheet.
Therefore, in the case of a steel sheet having a small thickness such as a steel sheet for can production, secondary cold rolling (hereinafter, referred to as DR rolling) having a reduction ratio of about 10% to 40% may be performed instead of temper rolling. DR rolling contributes to making the steel sheet thinner and also to increasing the strength, and is therefore an effective method for obtaining a hard thin steel sheet.
In general, DR rolling is performed using a rolling mill having at least two stands, a main reduction stand that performs rolling at a desired reduction ratio and a finish rolling stand for adjusting the shape and surface roughness of a plate. In the main reduction mill, lubricity for obtaining a desired reduction ratio is required, and therefore wet rolling using lubricating oil is performed using bright rolls which are ground with a grindstone to impart scratches. In addition, in the finish rolling stand, the surface roughness of the steel sheet is adjusted by a bright roll having a roughness corresponding to the request of the user.
As described above, in conventional DR rolling, a bright roll is generally used in each stand. However, friction and scratches between the steel sheets may be conspicuous during steel sheet processing, which is problematic.
In addition, in steel cans as storage containers for foods, beverages and the like, users are required to have not only thin walls and high strength but also excellent surface gloss, particularly whiteness (low gloss) after coating.
Patent document 1 discloses a temper rolling method of a tin plate having low glossiness, which is characterized in that rolling is performed using a roughened roller and a bright roller subjected to piercing. Further, patent document 1 discloses an example in which the rolling reduction is 35%.
Patent document 1: japanese patent laid-open publication No. 2006-167783
However, in patent document 1, since the rough surface roll has a low roughness of 0.4 μmRa or less, it takes time for roll processing, and there is a problem in terms of stable roll supply such as, for example, untimely preparation of a preparation roll when roll surface defects such as roll damage occur along with rolling.
In addition, the conventional method and the method described in patent document 1 cannot sufficiently prevent the occurrence of damage.
Disclosure of Invention
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a steel sheet having strength as a can material and excellent in flaw resistance, a method for producing the same, and a secondary cold rolling mill.
The strength in the present invention means a strength required when a steel sheet is used as a can material, that is, a desired strength required for a steel can used as a storage container for food, beverage, or the like. This is achieved by ensuring the conventional DR reduction ratio range (10% to 40%).
The present inventors have conducted intensive studies to solve the above problems.
As a result, it was found that the surface condition of the steel sheet is very important to obtain a steel sheet excellent in scratch resistance, and it is important to control the 20-degree specular gloss, and preferably to control the arithmetic average roughness Ra and the peak count (hereinafter, sometimes referred to as PPI). In addition, in order to achieve both the strength and the scratch resistance of the steel sheet, it is important to balance the HR30T hardness and the 20-degree specular gloss.
The present invention has been completed based on such findings, and the gist thereof is as follows.
[1] HR30T steel sheet having a hardness of 68 or more and a 20-degree specular gloss of 120 or less.
[2] The steel sheet according to the above [1], wherein the steel sheet has an arithmetic average roughness Ra of 0.50 to 0.80 μm and a peak count (PPI) of 200 to 300.
[3] A method for producing a steel sheet as defined in the above [1] or [2], comprising hot rolling a slab, subjecting the slab to primary cold rolling and annealing, and subjecting the slab to secondary cold rolling using a bright roll having an arithmetic average roughness Ra of 0.15 to 0.25 μm and a matte roll having an arithmetic average roughness Ra of 1.5 to 3.0 μm and a PPI of 250 or more.
[4] A cold secondary rolling mill is provided with at least two stands including a main reduction stand as a final stand and a final stand, the main reduction stand including bright rolls having an arithmetic mean roughness Ra of 0.15 to 0.25 [ mu ] m, and the finish rolling stand including matte rolls having an arithmetic mean roughness Ra of 1.5 to 3.0 [ mu ] m and a PPI of 250 or more.
[5] A method for producing a steel sheet, which comprises hot rolling a slab, subjecting the slab to primary cold rolling and annealing, and subjecting the slab to secondary cold rolling using the secondary cold rolling mill described in [4], wherein the HR30T hardness is 68 or more and the 20-degree specular gloss is 120 or less.
[6] A method for producing a steel sheet, which comprises hot rolling a slab, subjecting the slab to a primary cold rolling, annealing, and subjecting the slab to a secondary cold rolling by using the secondary cold rolling mill as described in [4], and which produces a steel sheet having a hardness of HR30T of 68 or more and a 20-degree specular gloss of 120 or less, and having an arithmetic average roughness Ra of 0.50 to 0.80 μm and a PPI of 200 to 300 on the surface of the steel sheet.
In the present specification, the term "all% of the steel components" means "mass%.
According to the present invention, a steel sheet having excellent scratch resistance can be obtained. Further, according to the manufacturing method of the present invention, it is possible to stably manufacture a high-strength steel sheet excellent in flaw resistance preferred by users while securing the conventional DR reduction range (10% to 40%).
In addition, when the steel sheet of the present invention is formed into a can, the steel sheet has excellent surface gloss, and also has excellent surface appearance by preventing friction damage and scratches between the steel sheets.
The steel sheet of the present invention is suitable for use as a material for food cans, beverage cans, and particularly for milk powder cans.
Detailed Description
The present invention will be described in detail below.
The HR30T hardness of the steel sheet of the present invention is 68 or more, and the 20-degree specular gloss is 120 or less. Further preferably, the steel sheet surface has an arithmetic average roughness Ra of 0.50 to 0.80 μm and a PPI of 200 to 300.
In the case of the steel sheet, a low-gloss steel sheet which is less likely to cause friction and scratches between steel sheets and is desired by a user can be obtained.
HR30T hardness: 68 or more
In the steel sheet of the present invention, if the HR30T hardness is less than 68, for example, a desired strength in forming into a can cannot be obtained. Therefore, the lower limit of the hardness of HR30T is 68. On the other hand, if the upper limit of the hardness exceeds 85, the hardness may be too high, which may make it difficult to form food cans or beverage cans. Therefore, the HR30T hardness is preferably 85 or less, which is the upper limit of the standard for the hardness of the maximum temper grade DR-10 specified in JIS G3303. From the viewpoint of balance between can strength and workability, HR30T hardness is more preferably 70 or more, and preferably 82 or less.
HR30T hardness can be measured by the method described in the examples described later.
20-degree specular gloss: 120 or less
In the steel sheet of the present invention, when the 20-degree specular gloss exceeds 120, sufficient scratch resistance cannot be obtained. Therefore, the upper limit of the 20-degree specular gloss is 120. On the other hand, if the 20-degree specular gloss is too low, the appearance may be poor in the steel sheet surface, and as a result, a problem may occur in the appearance of the can. Therefore, the 20-degree specular gloss is preferably 50 or more. In order to obtain more stable appearance and marring resistance, the 20-degree specular gloss is preferably 60 or more, and preferably 110 or less.
The 20-degree specular gloss can be measured by the method described in the examples described later. The 20-degree specular gloss can be measured using a gloss meter.
The arithmetic average roughness Ra is 0.50 to 0.80 [ mu ] m (preferred conditions)
Damage may also occur due to contact between cans after forming steel sheets into cans, for example. In order to prevent such contact damage, it is preferable to ensure that Ra is 0.50 μm or more. On the other hand, if the roughness is too large, the color tone of the steel sheet surface becomes whitish, and the steel sheet may have a problem in appearance. Therefore, the arithmetic average roughness Ra of the steel sheet surface is preferably 0.50 μm to 0.80. mu.m. The arithmetic average roughness Ra of the steel sheet surface is more preferably 0.55 μm or more, and still more preferably 0.75 μm or less.
The arithmetic average roughness Ra of the steel sheet surface can be measured by the method described in the examples described later.
A peak count (PPI) of 200 to 300 (preferred conditions)
PPI is low in gloss at high levels and has good scratch resistance. In order to prevent contact damage of the steel sheets with each other, PPI is preferably 200 or more. On the other hand, if the PPI exceeds 300, the appearance may be problematic. Therefore, the PPI is preferably 300 or less. The PPI is more preferably 220 or more, and more preferably 270 or less. Further, in the present invention, the peak count (PPI) represents the number of Peaks Per Inch (maximum number) in a roughness curve of surface roughness specified in SAE911 standard in the united states (Peaks Per Inch). The peak count (PPI) can be measured by the method described in the examples described later.
In the present invention, the composition of the steel sheet is not limited.
Sheet thickness (preferred conditions)
When the steel sheet of the present invention is used as a can material, the sheet thickness is preferably 0.10mm to 0.60mm from the viewpoint of obtaining a desired strength and being as thin as possible.
Next, a method for manufacturing a steel sheet according to the present invention will be described.
The steel sheet of the present invention is manufactured by hot rolling a billet, performing primary cold rolling and annealing, and then performing secondary cold rolling. In this case, the secondary cold rolling is performed by using, for example, a bright roll having an arithmetic average roughness Ra of 0.15 to 0.25 μm and a matte roll having an arithmetic average roughness Ra of 1.5 to 3.0 μm and a PPI of 250 or more. The secondary cold rolling mill comprises: a main screw-down frame having a bright roller with an arithmetic average roughness Ra of 0.15 to 0.25 [ mu ] m; and a finish rolling stand provided with a ground roll having an arithmetic average roughness Ra of 1.5 to 3.0 [ mu ] m and a PPI of 250 or more, wherein the second cold rolling is performed by using the above-mentioned secondary cold rolling mill, whereby a steel sheet having a hardness of HR30T of 68 or more and a 20-degree specular gloss of 120 or less, preferably having an arithmetic average roughness Ra of 0.50 to 0.80 [ mu ] m and a peak count (PPI) of 200 to 300 on the surface of the steel sheet can be obtained.
Working roll of main press-down frame
As the work rolls of the main screw down stand, bright rolls having an arithmetic average roughness Ra of 0.15 to 0.25 μm were used.
In order to control the thickness of the steel sheet and obtain a desired strength, the DR rolling reduction is required to be 10% to 40%. In order to ensure the DR rolling reduction of 10% to 40%, a bright roll is used as the main rolling mill, and the bright roll can be wet-rolled using a lubricating oil.
Arithmetic average roughness Ra: 0.15-0.25 mu m
If the work roll roughness Ra of the main screw down frame is less than 0.15 μm, the gloss of the final product sheet becomes high, while if Ra exceeds 0.25 μm, a desired screw down ratio may not be obtained. Therefore, the roughness Ra of the working roll of the main screw-down frame is 0.15 to 0.25 μm. In order to ensure stable operability, the work roll roughness Ra of the main screw down frame is more preferably 0.17 μm or more, and still more preferably 0.23 μm or less.
Working roll of finish rolling machine frame
As the work rolls of the finish rolling stand, a ground roll having an arithmetic average roughness Ra of 1.5 to 3.0 μm and a PPI of 250 or more is used in order to impart a predetermined roughness to the surface of the steel sheet.
The roughness of the surface of the roughened roller can be adjusted by, for example, electric discharge machining.
The arithmetic average roughness Ra is 1.5-3.0 μm
If the roughness Ra of the work rolls of the finish rolling stand is less than 1.5 μm, the desired low gloss cannot be obtained, and if Ra exceeds 3.0. mu.m, the roughness of the product sheet becomes too high. Therefore, the work roll roughness Ra of the finish rolling stand is 1.5 μm to 3.0. mu.m.
The work roll roughness Ra of the finish rolling stand is more preferably 1.7 μm or more, and still more preferably 2.5 μm or less, in order to obtain a stable product appearance.
PPI: over 250 of
If the PPI on the work roll surface of the finish rolling stand is less than 250, the desired low gloss level is not obtained. Therefore, the PPI for the work roll surface of the finish rolling stand has a lower limit of 250. On the other hand, in order to make the PPI of the above steel sheet 300, the PPI of the surface of the work roll of the finish rolling stand is preferably 350 or less. The PPI of the surface of the work roll of the finish rolling stand is more preferably 270 or more, and more preferably 320 or less.
As described above, in the present invention, it is preferable to use a secondary cold rolling mill, which is a rolling mill having at least two stands of a finish rolling stand as a final stand and a main reduction stand as a preceding stand, in the production of the steel sheet of the present invention, wherein the main reduction stand is provided with bright rolls having an arithmetic mean roughness Ra of 0.15 to 0.25 μm, and the finish rolling stand is provided with ground rolls having an arithmetic mean roughness Ra of 1.5 to 3.0 μm and a PPI of 250 or more.
The secondary cold rolling mill generally includes two stands, i.e., a finish rolling stand as a final stand and a main reduction stand as a preceding stand, but may further include a stand for temper rolling in front of the main reduction stand. In this case, the work rolls of the stand for temper rolling before the main reduction stand may be the bright rolls or the ground rolls, but the ground rolls are preferable from the viewpoint of low gloss.
The steel sheet of the present invention may be used without being subjected to plating treatment, or may be used after being subjected to plating treatment, and the effects can be obtained.
Examples of the plating treatment include Ni plating and tin plating. Further, the tin-plated layer may have a chromium hydrated oxide amount on the surface thereof from the viewpoint of ensuring corrosion resistance and ensuring scratch resistance. Alternatively, the tin-plated layer may have a metal chromium content on the surface thereof from the viewpoint of ensuring corrosion resistance and ensuring scratch resistance. When the tin plating layer has metallic chromium on the surface thereof, chromium hydrated oxide may be further formed on the surface of the metallic chromium.
Examples
For a polycarbonate having a C content in mass%: 0.04%, Si: 0.01%, Mn: 0.3%, P: 0.015%, S: 0.015%, Sol Al: 0.04%, N: 0.002%, and the balance of Fe and inevitable impurities, hot rolling, primary cold rolling, and annealing. Next, a secondary cold rolling mill (DR rolling mill) composed of two stands was used to perform secondary cold rolling (DR rolling) under the conditions shown in table 1.
The DR rolling speed was 800mpm, and the main reduction stands were rolled using lubricating oil. In order to achieve high PPI of the ground roll of the finish rolling stand, electric discharge machining is used in the present example. However, the method is not limited as long as PPI can be secured.
In table 1, "predetermined reduction ratio is ensured" indicates whether or not DR reduction ratio can be ensured at 20% to 25%, and if it can be ensured, it is marked with "o", and if it cannot be ensured, it is marked with "x".
The hardness of HR30T, the specular gloss of 20 degrees, the arithmetic mean roughness Ra and the PPI were measured by the following methods for the steel sheet obtained as described above. In addition, scratch resistance was evaluated by the method described below.
HR30T hardness
The HR30T hardness was measured by the method prescribed in JIS Z2245.
20 degree specular gloss
The 20-degree specular gloss is measured by a method defined in JIS Z8741.
Arithmetic average roughness Ra
The arithmetic average roughness Ra was measured by a stylus surface roughness meter in accordance with JIS B0601 (2001).
PPI
PPIs can be measured using a stylus surface roughness meter. The length of the roughness curve in the direction of the average line was 1 inch (25.4mm), and a constant reference level (cut-off level: 0.635 μm) was set with respect to the average line of the roughness curve, and the number of counts was 1 when the average line exceeded a negative reference level and then exceeded a positive reference level. The total number of counts at this time is PPI.
Scratch resistance
The steel sheets obtained as described above were subjected to can forming processing, and the steel sheets after can forming were brought into contact with each other to evaluate the presence or absence of scratches on the steel sheet surfaces. In table 1, the case of having scratches was "x", the case of having no scratches was "o", and o was good and acceptable.
The results obtained above are shown in table 1 together with the conditions.
[ Table 1]
*1: the 20-degree specular gloss was "O" at 120 degrees or less, and "X" at more than 120 degrees.
In invention examples 1 to 6, which are examples of the present invention, good scratch resistance was obtained in both HR30T hardness and 20-degree specular gloss of the steel sheet as a result of properly adjusting the roughness of the work rolls in both the main reduction mill and the finish rolling mill.
On the other hand, in comparative example 1, as a result of applying work rolls having a low roughness to the main roll frame, the 20-degree mirror surface gloss of the steel sheet was outside the range of the present invention, and the surface gloss was high and the scratch resistance was poor.
As a result of using a work roll having a low work roll roughness in the finish rolling stand in comparative example 2, the 20-degree mirror surface gloss was outside the range of the present invention, and the scratch resistance was poor.
The work roll roughness Ra of the main reduction frame and the finish rolling frame of comparative example 3 was within the range of the present invention, but the work roll PPI of the finish rolling frame was low, and therefore the 20-degree mirror surface gloss was outside the range of the present invention, and the scratch resistance was also poor.
As a result of applying the work rolls having high roughness to the main reduction frame in comparative examples 4 and 5, a predetermined reduction ratio could not be secured.
Claims (6)
1. A steel sheet, wherein,
the HR30T hardness of the steel sheet is 68 or more, and the 20-degree specular gloss is 120 or less.
2. The steel plate according to claim 1,
the steel sheet surface has an arithmetic average roughness Ra of 0.50 to 0.80 μm and a peak count PPI of 200 to 300.
3. A method for producing a steel sheet according to claim 1 or 2, wherein,
hot rolling the slab, then, cold rolling and annealing the slab once,
then, secondary cold rolling is performed by using a bright roll having an arithmetic average roughness Ra of 0.15 to 0.25 μm and a rough roll having an arithmetic average roughness Ra of 1.5 to 3.0 μm and a peak count PPI of 250 or more.
4. A secondary cold rolling mill used in the production of the steel sheet of claim 1 or 2,
the secondary cold rolling mill has at least two stands of a finishing stand as a final stand and a main reduction stand as a preceding stand thereof,
the main screw-down frame is provided with a bright roller with arithmetic average roughness Ra of 0.15-0.25 μm,
the finish rolling stand is provided with a matte roller having an arithmetic average roughness Ra of 1.5 to 3.0 [ mu ] m and a peak count PPI of 250 or more.
5. A method for manufacturing a steel sheet, wherein,
hot rolling the slab, then, cold rolling and annealing the slab once,
subsequently, the secondary cold rolling is performed by using the secondary cold rolling mill according to claim 4,
a steel sheet having a hardness of 68 or more and a 20-degree specular gloss of 120 or less was produced from HR 30T.
6. A method for manufacturing a steel sheet, wherein,
hot rolling the slab, then, cold rolling and annealing the slab once,
then, the secondary cold rolling is performed by using the secondary cold rolling mill according to claim 4 to manufacture a steel sheet having HR30T hardness of 68 or more, 20-degree specular gloss of 120 or less, arithmetic average roughness Ra of the steel sheet surface of 0.50 to 0.80 μm, and peak count PPI of 200 to 300.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-226390 | 2017-11-27 | ||
| JP2017226390 | 2017-11-27 | ||
| PCT/JP2018/042995 WO2019103041A1 (en) | 2017-11-27 | 2018-11-21 | Steel sheet, method for producing same, and secondary cold rolling mill |
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| Publication Number | Publication Date |
|---|---|
| CN111344075A CN111344075A (en) | 2020-06-26 |
| CN111344075B true CN111344075B (en) | 2022-07-08 |
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| CN201880073450.XA Active CN111344075B (en) | 2017-11-27 | 2018-11-21 | Steel sheet, method for producing same, and secondary cold rolling mill |
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| Country | Link |
|---|---|
| JP (1) | JP6673525B2 (en) |
| CN (1) | CN111344075B (en) |
| WO (1) | WO2019103041A1 (en) |
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| CN101663412A (en) * | 2007-04-26 | 2010-03-03 | 杰富意钢铁株式会社 | Steel sheet for use in can, and method for production thereof |
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| CN105378134A (en) * | 2013-07-17 | 2016-03-02 | 杰富意钢铁株式会社 | Steel sheet for can, and method for manufacturing same |
| CN106133167A (en) * | 2014-03-28 | 2016-11-16 | 杰富意钢铁株式会社 | Steel plate for tanks and manufacture method thereof |
| CN106255772A (en) * | 2014-04-30 | 2016-12-21 | 杰富意钢铁株式会社 | Steel sheet for high-strength container and manufacture method thereof |
| CN106544588A (en) * | 2015-09-17 | 2017-03-29 | 上海梅山钢铁股份有限公司 | A kind of one side print applies the tin plate and its manufacture method of ovenable decoration firing frame print |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4305814B2 (en) * | 2001-12-04 | 2009-07-29 | Ｊｆｅスチール株式会社 | Manufacturing method of high-gloss cold-rolled steel sheet |
| JP4325436B2 (en) * | 2004-02-27 | 2009-09-02 | Ｊｆｅスチール株式会社 | Steel plate for cans, steel plate for cans and method for producing them |
| JP2005319480A (en) * | 2004-05-07 | 2005-11-17 | Jfe Steel Kk | Method for manufacturing low-glossiness plated original sheet |
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2018
- 2018-11-21 WO PCT/JP2018/042995 patent/WO2019103041A1/en active Application Filing
- 2018-11-21 JP JP2019503594A patent/JP6673525B2/en active Active
- 2018-11-21 CN CN201880073450.XA patent/CN111344075B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0890119A (en) * | 1994-09-20 | 1996-04-09 | Nippon Steel Corp | Lightweight steel can having excellent flange formability and strength |
| JP2006167783A (en) * | 2004-12-17 | 2006-06-29 | Nippon Steel Corp | Steel sheet stock for can and skinpass rolling method therefor |
| CN101663412A (en) * | 2007-04-26 | 2010-03-03 | 杰富意钢铁株式会社 | Steel sheet for use in can, and method for production thereof |
| CN101983251A (en) * | 2008-04-03 | 2011-03-02 | 杰富意钢铁株式会社 | High-strength steel plate for a can and method for manufacturing said high-strength steel plate |
| CN105378134A (en) * | 2013-07-17 | 2016-03-02 | 杰富意钢铁株式会社 | Steel sheet for can, and method for manufacturing same |
| CN106133167A (en) * | 2014-03-28 | 2016-11-16 | 杰富意钢铁株式会社 | Steel plate for tanks and manufacture method thereof |
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| CN106544588A (en) * | 2015-09-17 | 2017-03-29 | 上海梅山钢铁股份有限公司 | A kind of one side print applies the tin plate and its manufacture method of ovenable decoration firing frame print |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111344075A (en) | 2020-06-26 |
| WO2019103041A1 (en) | 2019-05-31 |
| JPWO2019103041A1 (en) | 2019-12-12 |
| JP6673525B2 (en) | 2020-03-25 |
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