EP3691804A1 - Method for operating an integrated casting roll facility, and integrated casting roll facility - Google Patents
Method for operating an integrated casting roll facility, and integrated casting roll facilityInfo
- Publication number
- EP3691804A1 EP3691804A1 EP18788997.7A EP18788997A EP3691804A1 EP 3691804 A1 EP3691804 A1 EP 3691804A1 EP 18788997 A EP18788997 A EP 18788997A EP 3691804 A1 EP3691804 A1 EP 3691804A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strand
- coating material
- strip
- rolling
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005266 casting Methods 0.000 title claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 72
- 239000011248 coating agent Substances 0.000 claims abstract description 71
- 238000005096 rolling process Methods 0.000 claims abstract description 55
- 239000000463 material Substances 0.000 claims abstract description 45
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 claims abstract description 27
- 238000009749 continuous casting Methods 0.000 claims abstract description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 238000009792 diffusion process Methods 0.000 claims abstract description 6
- 230000009257 reactivity Effects 0.000 claims abstract description 6
- 239000002131 composite material Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- 229910021538 borax Inorganic materials 0.000 claims description 10
- 239000004328 sodium tetraborate Substances 0.000 claims description 10
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 5
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 4
- 239000004327 boric acid Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 3
- CDMADVZSLOHIFP-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 CDMADVZSLOHIFP-UHFFFAOYSA-N 0.000 claims description 3
- RSCACTKJFSTWPV-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;pentahydrate Chemical compound O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 RSCACTKJFSTWPV-UHFFFAOYSA-N 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 159000000000 sodium salts Chemical class 0.000 claims description 2
- 230000001464 adherent effect Effects 0.000 claims 1
- 230000001680 brushing effect Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000376 reactant Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000004686 pentahydrates Chemical class 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
Definitions
- the present invention relates to the technical field of cast-rolling composite plants and the production of flat, metallic steel products on a casting roll
- the invention relates to a method for operating a cast-rolling composite plant, wherein in one
- Continuous casting machine molten steel to an endless strand with slab cross-section, preferably thin slab cross section, is cast, the strand in a roughing mill to a pre-strip pre-rolled, the pre-strip in one
- Finishing mill is finished rolled into a finished strip, and the finished strip is discharged after cooling as a plate or reel.
- the invention relates to a cast-rolling composite plant for carrying out the method according to the invention, comprising - a continuous casting machine for casting
- Cast-rolling compound plants such as an Arvedi-ESP plant, a CSP plant or a QSP-DUE plant, have become established in the market for the production of flat steel products.
- Vorstrariess before the finish rolling is necessary.
- the energy efficiency of the cast-rolling composite system drops and the operating costs increase.
- the reactant metal powder, carbon but also metal oxides are mentioned.
- Silicon base known as a coating material.
- the invention is based on the object, not the
- Coating material to be coated is coated. However, the coating takes place before any possible
- the invention is suitable both for continuous cast-rolling compound systems as well as for batch or semi-endless operation.
- Coating material achieved.
- ⁇ material such as a powdered borate
- the diffusion of oxygen is hindered in the strand or the reactivity reduced the hot broadsides.
- the coating material may be either in solid form, e.g. as a powder, in liquid form, or as one
- Emulsion e.g. as a powder dissolved in a carrier (e.g., water).
- a carrier e.g., water
- the coating material can be sprayed onto the broad sides together with a liquid or gaseous carrier, in particular water or air, or the coating material can be rolled or brushed.
- the coating material is a borate, in particular a salt of boric acid, more preferably a sodium salt of boric acid, most preferably borax with or without
- Water of crystallization such as Anhydrous borax (a 2 B 4 0 7 ), borax
- Pentahydrate (a 2 B 4 0 7 ⁇ 5H 2 O) or Borax decahydrate
- the coating material includes at least one of these compounds.
- the coated strand is heated in a tunnel furnace before entering the roughing train, whereby the temperature of the strand or the slab either homogenized over the thickness and / or a Temperature drop is compensated.
- Tunnel kiln may, for example, also be operated with an oxidizing or reducing atmosphere. Especially with thin finished strip thicknesses, it is advantageous if the strand, the pre-strip and the finished strip, the continuous casting machine, the roughing mill and the
- Finishing mill passes through uncut.
- the scale has a high ductility. This is achieved when the scale, for example, from the phase portions 4 - 6% FeO, 30 - 40% Fe30 4 and 55 - 65% Fe 2 Ü3 composed.
- VorstMakes before, preferably immediately before, to desalt the entry into the finishing train.
- the object of the invention is also achieved by a casting-rolling compound system according to claim 15, wherein in the strand guide of the continuous casting machine or after the
- Coating machine for coating the two broad sides of the strand is arranged with a coating material, and that the coated strand entsentundert in the
- the coating machine has a mixer for intimately mixing the solid or liquid
- Spray nozzles is sprayed onto the broad sides of the strand.
- the coating machine may be a roller for rolling the coating material or brushes for
- a tunnel oven is arranged in the transport direction after the coating machine and before the roughing train.
- FIG. 1 shows a cast-rolling composite plant according to the prior art.
- FIG. 2 shows a cast-rolled composite plant according to the invention
- FIG. 3 shows a first variant with a cast-rolling composite system according to the invention for FIG. 2
- FIG. 4 is an illustration of a water circuit for a
- FIG. 5 shows a representation of a coating device with suction
- FIG. 6 shows a second variant with a cast-rolling composite system according to the invention to FIG.
- FIG. 1 shows a cast-rolled composite plant with a casting-rolling system
- Continuous casting machine 1 a tunnel kiln 4, a roughing mill 6, a finishing train 8, a cooling section 9 and at least one coiler 10 according to the prior art.
- a teilerstarrter strand 30 forms with the cross section of a thin slab 16.
- the endless strand 30 can be cut by scissors 3 into slabs. The strand 30 or the
- Thin slab 16 is then heated in the tunnel kiln 4, whereby the temperature profile is equalized or
- Vorwalzen is the so-called. Vorband heated by an induction furnace 7 to rolling temperature. In order to prevent the rolling of scale in the finishing train 8, the pre-strip is descaled by a further descaler 5, whereby the surface temperature in turn drops by about 50 to 100 ° C. After finish rolling, the finished strip in the cooling section 9 is cooled to reel temperature and wound up by a coiler 10. Optionally, the finished strip is cut by a pair of scissors 3 on bundle length.
- the dual descaling process reduces the energy efficiency of the cast-rolled composite plant. Because the finish rolling process reduces the finish rolling
- Induction furnace 7 can be compensated.
- FIG. 2 shows a first cast-rolled composite plant according to the invention.
- the broad sides of the strand 30 are either already coated in the continuous casting machine 1 or after the continuous casting machine 1 by a coating machine 11 with a coating material.
- the strand 30 with thin slab cross section or the thin slab 16 has a surface temperature between 900 and 1150 ° C.
- Borax with or without water of crystallization such as anhydrous borax (Na 2 B 4 OV), borax pentahydrate (Na 2 B 4 O 7 .5H 2 O) or borax decahydrate, can be used as the coating material (a 2 B 4 07 ⁇ 1 OH 2 O).
- the powdered coating material is either sprayed or brushed on the broad sides in the coating machine 11 together with a carrier, for example water or air.
- Coating material on the broad sides ensures that the diffusion of oxygen into the strand or the thin slab hampered or the reactivity of the hot
- the undentescended strand 30 is pre-rolled in the roughing train 6. Subsequently, the pre-strip is heated by the induction furnace 7 to rolling temperature. Depending on the quality requirements of the finished strip, the heated Vorband by the induction furnace 7 to rolling temperature.
- Descalor 5 descaled or not. Since the Entzunderer 5 is optional, it was shown by dashed lines. After this
- the finished strip is cooled and rewound as in the prior art.
- FIG. 3 shows a second cast-rolled composite plant according to the invention.
- Figure 2 is the
- Strand 30 or the thin slab 16 is heated after coating in a tunnel kiln 4. By heating, the
- FIG. 6 shows a very advantageous
- Tunnel kiln 4 uncentered into the seven-stand rolling mill 8a and is there finished rolled to a finished strip.
- the cooling and coiling takes place analogously to FIG.
- Scissors 3 and the rolling train 8a accelerates, so that the time that the thin slab is exposed to the oxygen in the air, is reduced.
- the diffusion of oxygen into the strand or the thin slab is hindered or the reactivity of the hot broadsides is reduced.
- the measures described not only improve the energy efficiency of the casting-rolling process but also drastically reduce the complexity of the cast-rolled composite plant. Both measures allow a cost-effective production of high quality finished strip.
- FIG. 4 shows a cross section through a coating machine 11 for spraying a coating material with a liquid carrier.
- a pump 14 sucks a carrier material from a tank 19, in this case water.
- the coating material 12 here powdered borax (would also be possible an emulsion of water and borax) is sucked by a Venturi mixer 13 from the container 12 and mixed with the pressurized water and then sprayed by spray nozzles 17 on the broad sides of the thin slab 30 and the thin slab 16.
- the superfluous emulsion of water and borax is at the lowest point of the coating machine 11 via a
- Figure 5 shows a cross section through a coating machine 11 for spraying a
- Coating material with a gaseous carrier For this purpose, a compressor sucks 20 air.
- Coating material 12 here again powdered borax, is sucked out of the container 12 by a Venturi mixer 13, mixed with the compressed air and then through
- Spray nozzles 17 sprayed onto the broad sides of the thin slab strand or the thin slab 16.
- the interior of the coating machine 11 is held by the fan 21 under a negative pressure, so that there is no contact between the operator at the casting-rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50843/2017A AT520084B1 (en) | 2017-10-03 | 2017-10-03 | Method for operating a cast-rolled composite plant and cast-rolled composite plant |
PCT/EP2018/074781 WO2019068444A1 (en) | 2017-10-03 | 2018-09-13 | Method for operating an integrated casting roll facility, and integrated casting roll facility |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3691804A1 true EP3691804A1 (en) | 2020-08-12 |
EP3691804B1 EP3691804B1 (en) | 2022-11-09 |
Family
ID=63896080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18788997.7A Active EP3691804B1 (en) | 2017-10-03 | 2018-09-13 | Method for operating an integrated casting roll facility, and integrated casting roll facility |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3691804B1 (en) |
CN (1) | CN111148581B (en) |
AT (1) | AT520084B1 (en) |
WO (1) | WO2019068444A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3769862A1 (en) | 2019-07-24 | 2021-01-27 | Primetals Technologies Austria GmbH | Method for producing a deep-drawable ready-made strip made of steel in a casting roller composite system |
CN113996656B (en) * | 2021-10-30 | 2023-12-05 | 日照宝华新材料有限公司 | Oxidized iron scale control device and method for low-carbon low-silicon plate and strip production line |
AT525563B1 (en) | 2022-02-18 | 2023-05-15 | Primetals Technologies Austria GmbH | DRY CASTING IN A COMBINED CASTING-ROLLING PLANT |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1266101B (en) * | 1962-08-13 | 1968-04-11 | Erik Allan Olsson | Process for protective surface treatment of cast material against scaling and decarburization during continuous casting |
DE19731124C1 (en) * | 1997-07-19 | 1999-01-21 | Schloemann Siemag Ag | Method and device for producing coated hot and cold strip |
DE19750817C2 (en) * | 1997-11-17 | 2003-03-20 | Sms Demag Ag | Process for improving the surface quality of a continuously cast slab |
BR0100836A (en) * | 2000-03-01 | 2001-10-30 | Ishikawajima Harima Heavy Ind | Apparatus and process for manufacturing a hot rolled steel plate, process and apparatus for pressing plate thickness and process for forming plate |
DE10023480A1 (en) * | 2000-05-10 | 2001-11-15 | Sms Demag Ag | Process for skimming oxidic rolled copper bars after casting in a continuous casting machine comprises wetting the casting with an emulsion mixed with reductant, and injecting a diluted aqueous hydrocarbon-containing solution as reductant |
ATA20322000A (en) * | 2000-12-05 | 2002-05-15 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING WARM OR COLD PRODUCTS IN THE FORM OF A TAPE, AT LEAST ONE-COATED |
DE10254306A1 (en) * | 2002-11-21 | 2004-06-03 | Sms Demag Ag | Method and device for hot-dip coating a metal strand |
AT501314B1 (en) * | 2004-10-13 | 2012-03-15 | Voest Alpine Ind Anlagen | METHOD AND DEVICE FOR CONTINUOUS PRODUCTION OF A THIN METAL STRIP |
DE102004061939B3 (en) * | 2004-12-22 | 2006-08-03 | Siemens Ag | Casting mill for a metal strip, production process for a metal strip and metal strip itself |
CN101448578B (en) * | 2007-04-29 | 2012-07-18 | 大连绿诺集团有限公司 | Anti-oxidation spraying method of steel billet and spraying equipment thereof |
CN101693791B (en) * | 2009-11-02 | 2011-07-20 | 北京科技大学 | Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof |
IT1400002B1 (en) * | 2010-05-10 | 2013-05-09 | Danieli Off Mecc | PROCEDURE AND PLANT FOR THE PRODUCTION OF FLAT LAMINATED PRODUCTS |
DE102013004905A1 (en) * | 2012-03-23 | 2013-09-26 | Salzgitter Flachstahl Gmbh | Zunderarmer tempered steel and process for producing a low-dispersion component of this steel |
DE102015004683A1 (en) * | 2015-04-09 | 2016-10-13 | Vdeh-Betriebsforschungsinstitut Gmbh | Method for producing a protective or other functional layer on a metallic material |
-
2017
- 2017-10-03 AT ATA50843/2017A patent/AT520084B1/en not_active IP Right Cessation
-
2018
- 2018-09-13 WO PCT/EP2018/074781 patent/WO2019068444A1/en unknown
- 2018-09-13 CN CN201880065012.9A patent/CN111148581B/en active Active
- 2018-09-13 EP EP18788997.7A patent/EP3691804B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
AT520084A4 (en) | 2019-01-15 |
EP3691804B1 (en) | 2022-11-09 |
AT520084B1 (en) | 2019-01-15 |
CN111148581B (en) | 2022-06-28 |
CN111148581A (en) | 2020-05-12 |
WO2019068444A1 (en) | 2019-04-11 |
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