US20100018665A1 - Process for producing a steel strip - Google Patents
Process for producing a steel strip Download PDFInfo
- Publication number
- US20100018665A1 US20100018665A1 US12/442,189 US44218907A US2010018665A1 US 20100018665 A1 US20100018665 A1 US 20100018665A1 US 44218907 A US44218907 A US 44218907A US 2010018665 A1 US2010018665 A1 US 2010018665A1
- Authority
- US
- United States
- Prior art keywords
- steel
- metallic inclusions
- sulfur content
- strip
- melt
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 title claims description 31
- 239000010959 steel Substances 0.000 title claims description 31
- 239000000161 steel melt Substances 0.000 claims abstract description 33
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 27
- 239000011593 sulfur Substances 0.000 claims abstract description 27
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910000655 Killed steel Inorganic materials 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims description 30
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 10
- 230000008018 melting Effects 0.000 description 28
- 238000002844 melting Methods 0.000 description 28
- 239000007788 liquid Substances 0.000 description 19
- 239000000203 mixture Substances 0.000 description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 17
- 229910052681 coesite Inorganic materials 0.000 description 9
- 229910052906 cristobalite Inorganic materials 0.000 description 9
- 239000000377 silicon dioxide Substances 0.000 description 9
- 229910052682 stishovite Inorganic materials 0.000 description 9
- 229910052905 tridymite Inorganic materials 0.000 description 9
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 238000005336 cracking Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000005496 eutectics Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 150000003463 sulfur Chemical class 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Definitions
- the invention relates to a process for the continuous production of a steel strip using at least two casting rolls and, if appropriate, laterally arranged side plates, wherein a casting reservoir, from which liquid steel melt can be introduced to the casting rolls, can be formed between the casting rolls and the side plates during operation.
- the steel strip produced when the two-roll casting process known from the prior art is used, has many cracks and surface defects which significantly reduce the quality of the steel strip produced.
- the object of the present invention is to avoid these known drawbacks of the prior art, and to provide a process for producing a steel strip, which is largely free of cracks and surface defects and has a homogeneous surface, from a low-carbon, partly Mn/Si killed steel melt.
- the tolerance of the melting temperature of non-metallic inclusions to deviations from a desired value of the steel composition should be sufficient to ensure that liquid, non-metallic inclusions are present in each treated ladle during the casting process during melting operation on an industrial scale.
- the object of the invention is achieved by means of a process in which a steel melt with a particular Mn/Si content ratio and with a particular sulfur content is processed, during normal operation, using a particular roll separating force (RSF).
- RSF roll separating force
- the invention therefore relates to a process for producing a strip-cast, low-carbon, partly Mn/Si killed steel strip, wherein a steel melt is introduced from a melt reservoir between at least two casting rolls, that are cooled and move together with a steel strip, and at least partly solidifies on the casting rolls to form the steel strip, characterized in that the steel melt has a sulfur content of between 20 and 300 ppm and an Mn/Si ratio ⁇ 3.5 and, during normal operation, the roll separating force is between 2 and 50 kN/m.
- a steel strip produced in this way is unexpectedly largely free of cracks and surface defects and has a homogeneous surface.
- a low-carbon steel strip is to be understood as meaning a steel strip with a carbon content of less than 0.1% by weight.
- the composition of the steel melt according to the invention ensures that the non-metallic inclusions have a low melting temperature.
- the low melting temperature has the effect that the non-metallic inclusions are present in a liquid state during the solidification of the steel shell on the casting rolls during the casting process.
- the tolerance of the melting temperature of non-metallic inclusions to deviations from a desired value of the steel composition is increased by the broadening of the composition range in which liquid, non-metallic inclusions are present in the multiphase system. This broadened composition range ensures that the steel melt has a composition which guarantees liquid, non-metallic inclusions during the casting process even when the desired value for a particular steel composition is not exactly met during melting operation on an industrial scale.
- oxidic or sulfidic non-metallic inclusions are produced in a steel melt.
- the main components of the non-metallic inclusions in partly Mn/Si killed steel melts are MnO and SiO 2 .
- the setting of the sulfur content to values of between 20 and 300 ppm and of the Mn/Si ratio to values ⁇ 3.5 has the effect that the non-metallic inclusions are principally composed of a multiphase system having the main components MnO—SiO 2 —MnS. If the MnS content of this multiphase system is less than 37% by weight MnS, the melting temperature of the multiphase system is less than the melting temperature of a multiphase system composed of the main components MnO and SiO 2 .
- the 3-phase system MnO—SiO 2 —MnS has a ternary eutectic at approximately 1130° C.
- the modeling of the 3-phase system MnO—SiO 2 —MnS in FIG. 1 shows that the liquidus range meets the binary boundary system MnO—SiO 2 at the eutectic temperature of 1251° C. of the latter at the eutectic point, and expands during the transition to a 3-phase system with an increasing MnS content. At lower temperatures, the liquidus range moved away from the boundary system and can still be found only above certain minimum MnS contents.
- Typical operating points which simultaneously have a low melting temperature of the non-metallic inclusions and a tolerance of the melting temperature to fluctuations in the MnS content which is sufficient during melting operation on an industrial scale, are approximately 15% by weight MnS in the case of the composition of the steel melt according to the invention.
- FIG. 2 shows the influence of the sulfur content of a low-carbon, partly Mn/Si killed steel melt (0.05% by weight C; 0.7% by weight Mn; 0.2% by weight Si) with an Mn/Si ratio ⁇ 3.5 on the tendency to cracking, expressed by the frequency of cracking or by the width of the melting interval of the steel melt, in relation to the composition of non-metallic inclusions and in relation to the melting temperatures (liquidus temperatures) of the non-metallic inclusions.
- the measured data in FIG. 2 were obtained from the above-mentioned immersion tests.
- the melting temperature of the non-metallic inclusions decreases with an increasing sulfur content.
- FIG. 2 shows the relative behavior between increasing tendency to hot cracking and decreasing melting temperature of the non-metallic inclusions.
- the sulfur content which is recommended according to the invention and at which sufficiently low melting temperatures of the non-metallic inclusions and simultaneously a tolerable tendency to hot cracking are achieved can therefore be derived from FIG. 2 .
- the presence of sulfur in a steel alloy expands the solid/liquid 2-phase area, i.e. the melting interval, of the steel alloy while simultaneously reducing the solidus temperature thereof, and this expands the temperature range in which hot cracks are produced between the liquid impenetration temperature (LIT) and the zero ductility temperature (ZDT).
- LIT liquid impenetration temperature
- ZDT zero ductility temperature
- the width of the 2-phase area increases approximately linearly up to approximately 45° C. at a sulfur content of up to 300 ppm in the steel melt. Above this sulfur content, the width of the 2-phase area remains approximately constant because MnS precipitates during the solidification with an increasing sulfur content. These MnS precipitates are deposited in solid form on the surfaces of the casting rolls and thereby prevent a homogeneous heat flow or a homogeneous cooling effect, and this encourages the formation of surface defects and cracks.
- An increasing sulfur content of the steel melt leads to increasing quantities of MnS precipitates and therefore to an increase in the number of surface defects and cracks.
- the lowering of the melting temperature of the liquid, non-metallic inclusions compared to multiphase systems composed of the main components MnO and SiO 2 is not large enough to ensure that liquid, non-metallic inclusions are present during the solidification of the steel shell on the casting rolls during the casting process.
- the width of the composition range in which liquid, non-metallic inclusions are present in the multiphase system is not large enough to ensure that there is a sufficient tolerance to deviations from a desired value of the steel composition during melting operation on an industrial scale.
- the sulfur content is preferably at least 50 ppm, particularly preferably at least 70 ppm.
- the upper limit of the sulfur content is preferably 250 ppm, particularly preferably 200 ppm.
- the sulfur content of the steel melt can be adjusted to the desired level by desulfurization or by the controlled addition of sulfur or of sulfur compounds.
- the Mn/Si ratio therefore needs to be greater than or equal to 3.5.
- the roll separating force is the force with which the casting rolls are pressed against one another during the casting process, based on the width of the steel strip.
- the roll separating force influences the presence of cracks and surface defects in a strip-cast steel strip.
- a small roll separating force avoids these problems and additionally affords the advantage that the casting apparatus is subjected to less mechanical stress.
- the selection of a small roll separating force may adversely affect the stability of the casting process since, in the case of a small roll separating force, there is the risk that the metal shells solidified on the casting rolls are insufficiently pressed together owing to inhomogeneities during the solidification and the steel strip cracks under its own weight, that the steel shells remain adhered to parts or over the whole width of the casting roll, and that cracks occur in the steel shell.
- the roll separating force is less than 50 kN/m. Since the composition of the steel melt according to the invention minimizes the occurrence of inhomogeneities during the solidification of the steel shells owing to the fact that it ensures the occurrence of liquid, non-metallic inclusions, such a small roll separating force can be used without risking the stability of the casting process.
- the lower limit for the roll separating force is 2 kN/m. Sufficient stability of the casting process is not ensured below this value.
- the non-metallic inclusions in the steel melt have a mass fraction of Al 2 O 3 of less than 45% by weight.
- the resultant multiphase system with the main components MnO—SiO 2 —MnS—Al 2 O 3 has a melting temperature which is less than the melting temperature of a multiphase system composed of the main components MnO and SiO 2 .
- the composition range in which liquid, non-metallic inclusions are present is broader in the multiphase system with the main components MnO—SiO 2 —MnS—Al 2 O 3 than in the multiphase system composed of the main components MnO and SiO 2 .
- the Al 2 O 3 content is set by selecting the starting materials for producing the steel melt and, if appropriate, by the targeted addition of Al or Al compounds.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0159306A AT504225B1 (de) | 2006-09-22 | 2006-09-22 | Verfahren zur herstellung eines stahlbandes |
| ATA1593/2006 | 2006-09-22 | ||
| PCT/EP2007/007228 WO2008034502A1 (de) | 2006-09-22 | 2007-08-16 | Verfahren zur herstellung eines stahlbandes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20100018665A1 true US20100018665A1 (en) | 2010-01-28 |
Family
ID=38541914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US12/442,189 Abandoned US20100018665A1 (en) | 2006-09-22 | 2007-08-16 | Process for producing a steel strip |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US20100018665A1 (pl) |
| EP (1) | EP2066466B2 (pl) |
| JP (1) | JP5129253B2 (pl) |
| KR (1) | KR101442724B1 (pl) |
| CN (1) | CN101516544B (pl) |
| AT (2) | AT504225B1 (pl) |
| AU (1) | AU2007299343B2 (pl) |
| BR (1) | BRPI0717489B1 (pl) |
| DK (1) | DK2066466T3 (pl) |
| ES (1) | ES2366139T5 (pl) |
| MX (1) | MX2009002629A (pl) |
| PL (1) | PL2066466T3 (pl) |
| RU (1) | RU2418650C2 (pl) |
| SI (1) | SI2066466T1 (pl) |
| UA (1) | UA93097C2 (pl) |
| WO (1) | WO2008034502A1 (pl) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7975754B2 (en) * | 2007-08-13 | 2011-07-12 | Nucor Corporation | Thin cast steel strip with reduced microcracking |
| CN113198995A (zh) * | 2021-04-25 | 2021-08-03 | 芜湖新兴铸管有限责任公司 | 一种包晶钢连铸坯凹陷改善控制方法 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020174767A1 (en) * | 2001-05-25 | 2002-11-28 | Hammelmann Maschinenfabrik Gmbh | Pump, particularly plunger pump |
| US6491089B1 (en) * | 1999-03-26 | 2002-12-10 | Sollac | Process for manufacturing carbon-steel strip by twin-roll continuous casting, product produced and apparatus |
| US6818073B2 (en) * | 2000-09-29 | 2004-11-16 | Nucor Corporation | Method of producing steel strip |
| US20050028898A1 (en) * | 2002-01-14 | 2005-02-10 | Usinor | Method for the production of a siderurgical product made of carbon steel with a high copper content, and siderurgical product obtained according to said method |
| US20050145304A1 (en) * | 2003-01-24 | 2005-07-07 | Blejde Walter N. | Casting steel strip |
| US20050211412A1 (en) * | 2002-10-15 | 2005-09-29 | Gerald Hohenbichler | Installation for continuously producing a thin steel strip |
| US20080035302A1 (en) * | 2006-08-09 | 2008-02-14 | Nucor Corporation | Method of casting thin cast strip |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3016632B2 (ja) † | 1991-07-09 | 2000-03-06 | 日新製鋼株式会社 | 双ロール式連鋳機の運転制御法 |
| JP3308102B2 (ja) * | 1994-05-26 | 2002-07-29 | キャストリップ・リミテッド・ライアビリティ・カンパニー | 金属ストリップ連続鋳造方法 |
| AUPN281195A0 (en) * | 1995-05-05 | 1995-06-01 | Bhp Steel (Jla) Pty Limited | Casting steel strip |
| JPH09168844A (ja) * | 1995-12-19 | 1997-06-30 | Mitsubishi Heavy Ind Ltd | 双ドラム式連続鋳造方法 |
| JP3117638B2 (ja) * | 1996-03-28 | 2000-12-18 | 新日本製鐵株式会社 | 薄帯鋳片連続鋳造方法 |
| IT1291931B1 (it) * | 1997-06-19 | 1999-01-21 | Voest Alpine Ind Anlagen | Procedimento per la produzione di nastri grezzi di colaggio in acciaio a basso contenuto di carbonio e nastri cosi' ottenibili |
| JP4518645B2 (ja) * | 2000-01-21 | 2010-08-04 | 日新製鋼株式会社 | 高強度高靱性マルテンサイト系ステンレス鋼板並びに冷延耳切れ抑止方法および鋼板製造法 |
| UA76140C2 (en) * | 2001-04-02 | 2006-07-17 | Nucor Corp | A method for ladle refining of steel |
| MXPA04002374A (es) * | 2001-09-14 | 2004-11-22 | Nucor Corp | Tira de acero colado. |
| KR100489018B1 (ko) * | 2002-08-30 | 2005-05-11 | 주식회사 포스코 | 쌍롤형 박판 주조기를 이용한 고망간강의 박판 제조 방법 |
| ES2714167T3 (es) * | 2003-10-10 | 2019-05-27 | Nucor Corp | Fundición de una banda de acero |
| WO2007079545A1 (en) * | 2006-01-16 | 2007-07-19 | Nucor Corporation | Thin cast steel strip with reduced microcracking |
-
2006
- 2006-09-22 AT AT0159306A patent/AT504225B1/de not_active IP Right Cessation
-
2007
- 2007-08-16 AU AU2007299343A patent/AU2007299343B2/en not_active Ceased
- 2007-08-16 AT AT07801685T patent/ATE514502T1/de active
- 2007-08-16 ES ES07801685.4T patent/ES2366139T5/es active Active
- 2007-08-16 JP JP2009528610A patent/JP5129253B2/ja not_active Expired - Fee Related
- 2007-08-16 MX MX2009002629A patent/MX2009002629A/es active IP Right Grant
- 2007-08-16 RU RU2009115180/02A patent/RU2418650C2/ru not_active IP Right Cessation
- 2007-08-16 US US12/442,189 patent/US20100018665A1/en not_active Abandoned
- 2007-08-16 DK DK07801685.4T patent/DK2066466T3/da active
- 2007-08-16 EP EP07801685.4A patent/EP2066466B2/de active Active
- 2007-08-16 UA UAA200902521A patent/UA93097C2/uk unknown
- 2007-08-16 SI SI200730701T patent/SI2066466T1/sl unknown
- 2007-08-16 CN CN2007800353340A patent/CN101516544B/zh active Active
- 2007-08-16 WO PCT/EP2007/007228 patent/WO2008034502A1/de not_active Ceased
- 2007-08-16 KR KR1020097008241A patent/KR101442724B1/ko not_active Expired - Fee Related
- 2007-08-16 PL PL07801685T patent/PL2066466T3/pl unknown
- 2007-08-16 BR BRPI0717489A patent/BRPI0717489B1/pt not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6491089B1 (en) * | 1999-03-26 | 2002-12-10 | Sollac | Process for manufacturing carbon-steel strip by twin-roll continuous casting, product produced and apparatus |
| US6818073B2 (en) * | 2000-09-29 | 2004-11-16 | Nucor Corporation | Method of producing steel strip |
| US20020174767A1 (en) * | 2001-05-25 | 2002-11-28 | Hammelmann Maschinenfabrik Gmbh | Pump, particularly plunger pump |
| US20050028898A1 (en) * | 2002-01-14 | 2005-02-10 | Usinor | Method for the production of a siderurgical product made of carbon steel with a high copper content, and siderurgical product obtained according to said method |
| US20050211412A1 (en) * | 2002-10-15 | 2005-09-29 | Gerald Hohenbichler | Installation for continuously producing a thin steel strip |
| US20050145304A1 (en) * | 2003-01-24 | 2005-07-07 | Blejde Walter N. | Casting steel strip |
| US20080035302A1 (en) * | 2006-08-09 | 2008-02-14 | Nucor Corporation | Method of casting thin cast strip |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE514502T1 (de) | 2011-07-15 |
| AT504225B1 (de) | 2008-10-15 |
| EP2066466A1 (de) | 2009-06-10 |
| UA93097C2 (uk) | 2011-01-10 |
| WO2008034502A1 (de) | 2008-03-27 |
| CN101516544A (zh) | 2009-08-26 |
| KR20090064462A (ko) | 2009-06-18 |
| ES2366139T5 (es) | 2014-10-06 |
| AU2007299343B2 (en) | 2011-09-08 |
| EP2066466B2 (de) | 2014-08-27 |
| KR101442724B1 (ko) | 2014-09-23 |
| BRPI0717489A2 (pt) | 2013-10-15 |
| BRPI0717489B1 (pt) | 2016-02-10 |
| ES2366139T3 (es) | 2011-10-17 |
| EP2066466B1 (de) | 2011-06-29 |
| JP2010504214A (ja) | 2010-02-12 |
| RU2009115180A (ru) | 2010-10-27 |
| AT504225A1 (de) | 2008-04-15 |
| MX2009002629A (es) | 2009-03-24 |
| SI2066466T1 (sl) | 2011-10-28 |
| JP5129253B2 (ja) | 2013-01-30 |
| CN101516544B (zh) | 2011-06-08 |
| PL2066466T3 (pl) | 2011-11-30 |
| DK2066466T3 (da) | 2011-10-24 |
| RU2418650C2 (ru) | 2011-05-20 |
| AU2007299343A1 (en) | 2008-03-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: SIEMENS VAI METALS TECHNOLOGIES GMBH & CO., AUSTRI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BERNHARD, CHRISTIAN;ECKERSTORFER, GERALD;HOHENBICHLER, GERALD;AND OTHERS;REEL/FRAME:022632/0699 Effective date: 20090420 |
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