EP3612652A1 - Blechumformbauteil sowie verfahren zur herstellung des blechumformbauteils - Google Patents
Blechumformbauteil sowie verfahren zur herstellung des blechumformbauteilsInfo
- Publication number
- EP3612652A1 EP3612652A1 EP18735493.1A EP18735493A EP3612652A1 EP 3612652 A1 EP3612652 A1 EP 3612652A1 EP 18735493 A EP18735493 A EP 18735493A EP 3612652 A1 EP3612652 A1 EP 3612652A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- martensite
- layers
- metal forming
- forming component
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
- C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
-
- 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
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
Definitions
- the present invention relates to a sheet metal forming component produced by hot forming and press hardening according to the features in the preamble of claim 1.
- the present invention further relates to a method for producing the Blechumformbauteils according to the features in claim 7 and a method for producing a metallic semi-finished product according to the features in claim 8.
- a method for producing the Blechumformbauteils according to the features in claim 7
- a method for producing a metallic semi-finished product according to the features in claim 8.
- sheet metal blanks are converted by means of conventional forming processes, such as deep drawing, to form a three-dimensionally shaped component.
- Such sheet metal forming components are used significantly in the automotive industry and here as motor vehicle components. Consequently, for the purposes of this invention, sheet metal forming components are to be understood as automotive components.
- motor vehicles In the case of motor vehicles, a distinction is made among other motor vehicle structural components, from which in particular a self-supporting motor vehicle body is produced. These include known automotive pillars, an A-pillar or B-pillar, side members, cross members, roof rails, sills, transmission tunnel or similar components. It is also possible to produce body shell components of the motor vehicle, for example a bonnet, a roof outer skin or also a door outer skin. Also attachments or crash components can be made, which are for example a crash box, a bumper cross member or the like.
- the sheet-metal forming components produced by hot forming and press-hardening for example of 22MnB5 grade steel, have good strength and ductility properties.
- the sheet metal forming component according to the invention is produced by hot forming and press hardening.
- the sheet metal forming component is made of a hardenable, one-piece and material-uniform steel alloy. It is thus not a clad material, but a material that is integrally formed in one piece and material uniform.
- the sheet metal forming component has a tensile strength Rm greater than 1200 MPa, in particular greater than 1350 MPa.
- the Blechumformbauteil also has a bending angle greater than 60 ° at a wall thickness of 0.5 to 1, 5 mm. With a larger wall thickness of 1, 5 to 2.5 mm, the sheet metal forming component has a bending angle greater than 45 °.
- the tensile strength should not exceed 2500MPa.
- the bending angle is determined in the platelet bending test according to VDA 238-100: 2010, with a yield strength Rp0.2 of greater than 900 MPa.
- the sheet metal forming component is now characterized in that, starting from both surfaces, layered martensite layers or martensite layers are respectively formed. Consequently, adjacent martensite layers with different properties are formed over the sheet thickness or wall thickness of an upper side and a lower side of the three-dimensionally formed sheet metal forming component. These are alternately more ductile and harder martensite layers. The ductile martensite layer is always on the surface or outside.
- the aforementioned sheet-metal forming component is produced from a hot-rolled product, also referred to below as semi-finished product.
- the hot rolled product is made in one piece and made of the same material. However, it has various layers in the material structure after completion of the rolling process.
- the layers can also be referred to as layers.
- the layers are in particular formed flat and preferably extend over the entire surface of the semi-finished product provided, but at least over the entire bandwidth.
- the semifinished product is preferably provided in the form of a circuit board.
- the respective outer layer is formed as a ferrite layer in the semifinished product.
- This in turn preferably has a thickness of 4 to 140 pm. Consequently, an outer ferrite layer is formed on the upper side and the lower side of the semi-finished product.
- a pearlite layer is formed, preferably with a thickness of 4 to 25 ⁇ m. Thereafter, in each case further ferrite and pearlite layers adjoin each other via the strip thickness or wall thickness. The layers always span the entire bandwidth.
- an outer low-carbon martensite layer and a carbon-rich martensite layer underneath can be produced, since the fast heating does not cause diffusion compensation between the ferritic and pearlitic layers.
- the outer ferrite layer is converted to a martensite layer which has lower strength but high ductility at the same time.
- the underlying pearlite layer is converted to a martensite layer with higher strength but reduced ductility.
- At least three, in particular at least five and particularly preferably at least seven layers of martensite are preferably formed over the wall thickness.
- a difference in strength between martensite layer having higher strength but reduced ductility and the martensite layer having lower strength but higher ductility is at least 100 to 300 MPa. That is, the higher strength martensite layer is at least 100 to 300 MPa thicker than the martensite layer having greater ductility but lower strength.
- the delta between the different martensitic layers of different strength should not exceed about 1,000 MPa. It can further be provided to form the outermost layer as edge-decarburized layer by additional targeted edge decarburization of the semifinished product, which has a very low carbon content.
- the existing, very low-carbon ferritic material structure is not or only to a small extent converted into martensite during press hardening, so that it has a significantly lower strength.
- the edge-decarburized layer has a substantially ferritic material structure. In comparison with the martensite layer with higher strength and reduced ductility, the difference in strength can be up to 1, 000 MPa.
- a Randentkohlung can be performed.
- the ductility in the edge region is increased again in the produced sheet metal forming component with preferably constant strength.
- the edge decarburization preferably takes place after the hot rolling of the sheet metal strip.
- the respective outer layer on the Blechumformbauteil thus the outer martensite layer, a layer thickness of 4 to 140 pm, preferably from 10 to 140 pm, in particular from 14 to 140 pm.
- this edge decarburization is in each case extending externally from the surface into the sheet metal forming component and thus included in the aforementioned layer thickness of the outer layer, or the edge-decarburized layer can also form the outer layer.
- edge decarburization in a layer of 10 to 140 ⁇ m, preferably 20 to 100 ⁇ m, from the surface may extend into the sheet metal forming component, in particular into the outer martensite layer.
- Hardenable steel alloys for example 22MnB5 or else MBW 1900 or MBW 1500, can be used to produce the sheet metal forming component according to the invention. These are manganese boron steels. Preferably, these have the following modification.
- the targeted cooling in a cooling section after the last roll stand makes it possible to set a layered structure of ferrite and pearlite over the strip thickness, starting from the surface. Due to the downstream rapid heating, hot forming and press hardening, this converts into corresponding martensite layers with mutually different strength properties. In particular, in the ferrite layer and pearlite layer, a fine martensite structure having locally different carbon contents is generated.
- the rapid heating in less than 1 min., Preferably less than 30s, most preferably less than 20s with a heating rate of more than 30K / s, in particular greater than 50K / s, from room temperature to over AC3 temperature in the invention preferably carried out by contact heating.
- contact plates are applied on one side or on both sides to the semi-finished product, thus to the circuit board.
- the contact plates have a higher temperature, so that due to heat conduction, the higher temperature of the contact plates is delivered to the semifinished product to be heated.
- an inductive heating, heating by burner flame or infrared is possible.
- the use of contact heating technology makes it possible, as it were, to temper only partial areas.
- the present invention further relates to a method for producing a sheet metal forming component with the following method steps:
- a hot rolled product is used as the metallic semi-finished product, which is produced by the method described below:
- the hot rolling can be carried out with the following process parameters:
- the so-hot-rolled and cooled steel strip especially in outer layers, has the ferrite and pearlite structure according to the invention which, in a downstream hot working and press hardening process, provides improved ductility of the produced sheet metal forming component as compared to a conventionally hot worked and press hardened steel with prior rapid heating.
- FIG. 1 shows an assembly sequence for the production of a semifinished product according to the invention and for further processing into a sheet-metal forming component produced according to the invention
- Figure 2 is a partial sectional view through a semifinished product according to the invention.
- 3 a to c are each a partial sectional view through a sheet metal forming component produced according to the invention.
- FIG. 4 shows a sheet metal forming component produced according to the invention
- Figure 5 is a partial sectional view through an inventive
- FIG. 1 shows a production method according to the invention.
- a slab 2 made of a hardenable steel alloy is provided, which is heated in an oven 14 and then passed through a rolling line 3.
- the furnace 14 has a temperature Ti which is greater than 1200 ° C.
- the rolled steel sheet strip 5 has a rolling end temperature. It is then passed through a cooling section 6.
- the cooled steel sheet strip 7 has a reel temperature to be subsequently compatibilcoilt on a coil unit 8.
- the bandwidth B extends into the image plane.
- the hot rolled product can also be a correspondingly separated circuit board 9 in accordance with the next method step.
- a decoiling process not shown, the steel sheet strip 7 is fed to a separation plant 10.
- the individual boards 9 are then subjected according to the invention a rapid heating in a tempering 1 1 and heated to over Austenitmaschinestemperatur.
- 1 1 contact plates 12 are arranged in the tempering, which come into contact with the board 9 to be heated.
- the heated board 9 is transferred to a hot forming and press hardening tool 13 and hot worked and press hardened. After completion of the press hardening process, the sheet metal forming component 1 produced according to the invention is obtained.
- FIG. 2 shows an excerpted cross section of the semifinished product or of the individualized board 9 before heating, and therefore prior to austenitizing.
- the board 9 has a total wall thickness, hereinafter called wall thickness W, which is preferably from 0.5 to 2.5 mm. From a respective outer surface 15, 16 of the wall thickness W alternately several layers of ferrite and perlite are arranged one above the other. The ferrite and pearlite layers are arranged directly adjacent. Beyond the wall thickness W, the board 9 or the semi-finished product is formed in one piece and of uniform material.
- the respective outer ferrite layer 17 preferably has a thickness D17 of 4 pm to 140 pm.
- the outer ferrite layer 17 then forms in each case also the surface 15, 16 of the circuit board 9.
- a pearlite layer 18 is disposed below the ferrite layer 17.
- the pearlite layer 18 preferably has a thickness D18 of 4 pm to 25 pm. Alternate then follow further ferrite layers 19, again followed by a respective pearlite layer 20. These may each have a thickness of 4 pm to 25 pm.
- FIG. 3 a shows the partial section according to FIG. 2 from the sheet metal forming component 1 already produced. Consequently, heating, hot forming and press hardening have taken place.
- the individual layers are further formed over the wall thickness W.
- the structure has changed into martensite.
- the previous ferrite layers have been converted to martensite layers 21 having lower strength and high ductility in relation to martensite layer 22 described below.
- the underlying pearlite layers 18, as viewed from the surface 15, 16, as well as the perlite layers 20 also located further inside, have been converted into martensite layers 22 of higher strength and lower ductility. Further inwardly, successive martensite layers 21 of lower strength and higher ductility and martensite layers 22 of higher strength and lower ductility are then alternately arranged.
- FIG. 3b shows an analog partial section to FIG. 3a, wherein here in each case a layer 26, each formed by edge decarburization, is present in each case outside.
- This essentially has a ferritic material structure, or the layers 26 can also consist entirely of ferrite.
- the edge decarburized layer 26 then passes into the outer martensite layer 21 having low strength but higher ductility.
- the randentkohlte layer 26 form the entire outer layer. This is followed directly by the martensite layer 22 with higher strength. This is shown in FIG. 3c.
- FIG. 4 shows a sheet-metal forming component 1 produced according to the invention as a motor vehicle component and specifically as a motor vehicle pillar.
- This Blechumformbauteil 1 has, for example, a lower foot area 23, an overhead roof connection area 24 and an intermediate central portion 25.
- the central portion 25 may have a smaller wall thickness W25 than, for example, the foot region 23.
- a partial longitudinal sectional view along section line AA is shown in FIG. It can be seen that the wall thickness W23 in the foot region 23 is smaller than the wall thickness W25 in the middle section 25.
- the individual martensite layers are also formed in the region of lesser wall thickness. The individual layers are produced, for example, by flexible cold rolling of the blank 9 or of the cooled steel sheet strip 7.
- the ferrite and pearlite layers are compressed and have a smaller thickness, but the same number over the wall thickness W.
- the individual martensite layers are then formed in the smaller wall thickness with the same number, but with a smaller thickness.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017112164.1A DE102017112164A1 (de) | 2017-06-01 | 2017-06-01 | Blechumformbauteil sowie Verfahren zur Herstellung des Blechumformbauteils |
PCT/DE2018/100530 WO2018219412A1 (de) | 2017-06-01 | 2018-06-01 | Blechumformbauteil sowie verfahren zur herstellung des blechumformbauteils |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3612652A1 true EP3612652A1 (de) | 2020-02-26 |
Family
ID=62791467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18735493.1A Withdrawn EP3612652A1 (de) | 2017-06-01 | 2018-06-01 | Blechumformbauteil sowie verfahren zur herstellung des blechumformbauteils |
Country Status (5)
Country | Link |
---|---|
US (1) | US20210156000A1 (de) |
EP (1) | EP3612652A1 (de) |
CN (1) | CN110662850A (de) |
DE (1) | DE102017112164A1 (de) |
WO (1) | WO2018219412A1 (de) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD135917A1 (de) * | 1978-04-26 | 1979-06-06 | Wolfgang Schmitt | Verfahren zur herstellung von walzstrahlerzeugnissen mit mehrschichtigem gefuegeaufbau |
JP3470660B2 (ja) * | 1999-11-15 | 2003-11-25 | 住友金属工業株式会社 | ばね用複層組織クロム系ステンレス鋼材およびその製造方法 |
JP5221348B2 (ja) * | 2006-07-27 | 2013-06-26 | 国立大学法人 東京大学 | 複層鋼及び複層鋼の製造方法 |
DE102011053698C5 (de) * | 2011-09-16 | 2017-11-16 | Benteler Automobiltechnik Gmbh | Verfahren zur Herstellung von Struktur- und Chassisbauteilen durch Warmformen und Erwärmungsstation |
WO2014037627A1 (fr) * | 2012-09-06 | 2014-03-13 | Arcelormittal Investigación Y Desarrollo Sl | Procede de fabrication de pieces d'acier revêtues et durcies a la presse, et tôles prerevêtues permettant la fabrication de ces pieces |
WO2015088523A1 (en) * | 2013-12-11 | 2015-06-18 | ArcelorMittal Investigación y Desarrollo, S.L. | Cold rolled and annealed steel sheet |
JPWO2015097882A1 (ja) * | 2013-12-27 | 2017-03-23 | 新日鐵住金株式会社 | 熱間プレス鋼板部材、その製造方法及び熱間プレス用鋼板 |
-
2017
- 2017-06-01 DE DE102017112164.1A patent/DE102017112164A1/de not_active Withdrawn
-
2018
- 2018-06-01 EP EP18735493.1A patent/EP3612652A1/de not_active Withdrawn
- 2018-06-01 US US16/618,293 patent/US20210156000A1/en not_active Abandoned
- 2018-06-01 WO PCT/DE2018/100530 patent/WO2018219412A1/de unknown
- 2018-06-01 CN CN201880034322.4A patent/CN110662850A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
US20210156000A1 (en) | 2021-05-27 |
DE102017112164A1 (de) | 2018-12-06 |
WO2018219412A1 (de) | 2018-12-06 |
CN110662850A (zh) | 2020-01-07 |
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