CN110983122A - 5A65 aluminum alloy strip and preparation method thereof - Google Patents
5A65 aluminum alloy strip and preparation method thereof Download PDFInfo
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- CN110983122A CN110983122A CN201911369733.1A CN201911369733A CN110983122A CN 110983122 A CN110983122 A CN 110983122A CN 201911369733 A CN201911369733 A CN 201911369733A CN 110983122 A CN110983122 A CN 110983122A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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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
- B21B1/46—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
- B21B1/466—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 non-continuous process, i.e. the cast being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/56—Elongation control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
Abstract
The invention discloses a 5A65 aluminum alloy strip and a preparation method thereof, and belongs to the technical field of aluminum alloy strips. The components of the composition are as follows: si 0< 0.04%, Fe 0< 0.05%, Cu 0< 0.1%, Mn 0< 0.03%, V0 < 0.02%, Zn 0< 0.05%, Ti 0< 0.025%, Mg 0.7-0.9%, and the balance of Al and inevitable impurities. The preparation method comprises the following steps: casting, ingot casting homogenization treatment, hot rolling, first cold rolling, intermediate annealing, second cold rolling, finished product annealing and stretch bending straightening. The 5A65 aluminum alloy strip is subjected to alloy component adjustment and an improved production process to obtain the 5A65 aluminum alloy strip with moderate strength, bright surface and high stability, meets the requirement of manufacturing highlight anodic oxidation bright stripes, and has popularization practicability.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy strips, and particularly relates to a 5A65 aluminum alloy strip and a preparation method thereof.
Background
The aluminum alloy material has the characteristics of light weight, high strength, easy coloring and the like, and is widely applied to the field of cosmetic product bottle caps. The traditional preparation process of the aluminum alloy cosmetic bottle cap adopts one-time annealing treatment and has large total deformation in the cold rolling process, so that the surface of an aluminum substrate after being punched has stretching stripes, and the stretching stripes can not be eliminated after being anodized, thereby the requirements of market standards and high-end customers on the product quality can not be met.
At present, 5505 aluminum alloys with high brightness strips applied to car window frames in the automobile industry exist in the market, but due to different application fields, indexes of various properties of the materials are greatly different, so that the 5505 aluminum alloys cannot be applied to the field of cosmetic bottle cap materials.
Disclosure of Invention
The invention aims to provide a 5A65 aluminum alloy strip and a preparation method thereof.
In view of the above, the inventors of the present invention have made long-term studies and extensive practices to obtain the technical solution of the present invention as follows:
1. A5A 65 aluminum alloy strip consists of the following components in percentage by weight: 0< Si < 0.04%, 0< Fe < 0.05%, 0< Cu < 0.1%, 0< Mn < 0.03%, 0< V < 0.02%, 0< Zn < 0.05%, 0< Ti < 0.025%, 0.7-0.9% of Mg, and the balance of Al and inevitable impurities, wherein the content of the impurities is less than 0.02%.
Preferably, the paint comprises the following components in percentage by weight: 0.02% of Si, 0.025% of Fe, 0.05% of Cu, 0.015% of Mn, 0.01% of V, 0.025% of Zn, 0.016% of Ti, 0.8% of Mg, the balance of Al and inevitable impurities, wherein the impurity content is less than 0.02%.
2. The preparation method of the 5A65 aluminum alloy strip comprises the following steps:
s1, casting: the method comprises the following steps of proportioning according to aluminum alloy components and weight percentage, melting aluminum into molten aluminum, adding magnesium and other alloy components, then forming alloy aluminum liquid through melting, refining, deslagging and degassing, and finally performing semi-continuous casting to obtain aluminum alloy flat ingots with the thickness of 500-550 mm 1100-1300 mm 5000-5500 mm;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, and then carrying out homogenization treatment for 1.5-2.5 hours at the temperature of 480-520 ℃;
s3, hot rolling: carrying out hot rough rolling on the alloy product subjected to homogenization treatment in S2 at the initial rolling temperature of 400-430 ℃, and carrying out hot finish rolling at the final rolling temperature of 330-350 ℃ to ensure that the thickness of the alloy product subjected to hot finish rolling is 4.1-4.5 mm;
s4, first cold rolling: rolling the alloy product obtained from S3 by using a working roll with the roughness of 0.4-0.5 mu m at the rolling speed of 200-300m/min for three passes, and then carrying out intermediate annealing treatment;
s5, secondary cold rolling: rolling the alloy product obtained in the step S4 by using a working roll with the roughness of 0.13-0.15 mu m, wherein the rolling speed is 100-200 m/min, and the processing rate is 20-30%; then reducing the roughness of the working roll, and continuously rolling for two passes at the rolling speed of 100-200 m/min and the processing rate of 15-20% to obtain a finished product;
s6, annealing of finished products: and (3) annealing the finished product for 5-5.5 hours at 230-240 ℃, and then stretching, bending and straightening to obtain the 5A65 aluminum alloy strip. The aim of stretch bending straightening is to release the internal stress of the strip and to flatten the surface of the plate.
Preferably, in the step S2, the temperature of the ingot homogenization treatment is 500 ℃ and the time is 2 hours. And the compound in the alloy product is in a uniformly distributed structure by ingot casting homogenization treatment.
Among them, the ingot homogenization treatment is preferably performed in a pusher furnace.
Preferably, in S3, the initial rolling temperature of the hot rough rolling is 420 ℃ and the final rolling temperature of the hot finish rolling is 340 ℃.
Preferably, in the step S4, the temperature of the intermediate annealing treatment is 340-360 ℃, and the intermediate annealing treatment is carried out after heat preservation for 4-6 hours.
Wherein, after S4 rolling and intermediate annealing treatment, the aluminum alloy strip which is completely recrystallized and has the total processing rate of 35-50% can be obtained.
Preferably, in S5, the roughness of the working roll used in the two continuous rolling passes is less than 0.03 μm.
Preferably, in the S5 step, the roughness of the finished product is less than 0.03 mu m, the thickness is 0.5-0.7 mm, and the surface is bright.
Preferably, in the S6, the surface roughness of the 5A65 aluminum alloy strip is less than 0.03 mu m, the tensile strength is 135-155 MPa, the yield strength is 110-120 MPa, and the elongation is 5-10%.
3. The 5A65 aluminum alloy strip is applied to producing cosmetic bottles as a high-gloss cosmetic bottle cap.
The purity of the aluminum water is 99.95-99.99%.
The raw materials in the preparation process of the invention can be directly purchased from the market.
The 5A65 aluminum alloy strip prepared by the invention is packaged by adopting a horizontal type derrick.
The invention has the beneficial effects that:
1) according to the 5A65 aluminum alloy strip, the raw materials of the original aluminum alloy strip are changed, the mixture ratio of each component of the alloy is adjusted, Mg is used as a main alloy element, and the content of other alloy elements is controlled, so that the aluminum alloy strip with various mechanical properties suitable for highlight cosmetic bottle caps is obtained;
2) according to the preparation method of the 5A65 aluminum alloy strip, reasonable ingot casting homogenization treatment is used, the internal segregation of the ingot casting is eliminated, coarse second-phase compounds are reduced, the uniform distribution of the ingot casting structure is ensured, the hot finish rolling temperature and the hot finish rolling thickness are controlled according to the final cold rolling thickness and the total reduction adjustment, a uniform recrystallization structure is obtained, two annealing process treatments are adopted, the deformation, the rolling speed and the roller roughness of each pass after intermediate annealing are controlled, and therefore the purposes of surface brightness (mirror effect can be achieved) and high stability of the aluminum alloy strip are achieved;
3) the 5A65 aluminum alloy strip with moderate strength, uniform structure, stable performance and small surface roughness is obtained by changing the alloy components and the proportion and improving the traditional production process, so that the use requirement of the 5A65 aluminum alloy strip for manufacturing the highlight anodic oxidation bright strip is met, and the popularization and the application are facilitated in industry.
Drawings
FIG. 1 is a graph showing the results of the examination of example 1 under a metallographic microscope in a bright field;
fig. 2 is a graph showing the results of the measurement of example 1 under the polarization of the metallographic microscope.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
Example 1
The preparation method of the 5A65 aluminum alloy strip of the embodiment comprises the following steps:
s1, casting: the aluminum alloy ingot is prepared by mixing 0.02% of Si, 0.025% of Fe, 0.05% of Cu, 0.015% of Mn, 0.01% of V, 0.025% of Zn, 0.016% of Ti, 0.8% of Mg and the balance of Al in percentage by weight, melting aluminum into molten aluminum, adding magnesium and other alloy components, then forming alloy aluminum liquid through melting, refining, deslagging and degassing, and finally performing semi-continuous casting to obtain 500-550 mm 1100-1300 mm 5000-5500 mm aluminum alloy slab ingots;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, and then carrying out homogenization treatment in a push type heating furnace at the temperature of 500 ℃ for 2 hours;
s3, hot rolling: carrying out hot rough rolling on the alloy product subjected to homogenization treatment in the S2 at the initial rolling temperature of 420 ℃, and carrying out hot finish rolling at the final rolling temperature of 340 ℃ to ensure that the thickness of the alloy product subjected to hot finish rolling is 4.2-4.3 mm;
s4, first cold rolling: rolling the alloy product obtained in the step S3 by using a working roll with the roughness of 0.45 mu m, wherein the rolling speed is 250m/min, the rolling is carried out for three passes, then, carrying out intermediate annealing treatment at the temperature of 350 ℃, preserving heat for 5 hours and then discharging the alloy product out of the furnace;
s5, secondary cold rolling: rolling the alloy product obtained in the step S4 by using a working roll with the roughness of 0.14 mu m, wherein the rolling speed is 150m/min, and the processing rate is 20-25%; then, using a working roll with the roughness of 0.02 mu m, and continuously rolling for two passes at the rolling speed of 150m/min and the processing rate of 15-20% to obtain a finished product with the thickness of 0.5-0.6 mm and a bright surface;
s6, annealing of finished products: and (3) annealing the finished product for 5h at 230 ℃, and then straightening by stretching and bending to obtain the 5A65 aluminum alloy strip.
Through detection and analysis, the mechanical properties of the 5A65 aluminum alloy strip prepared by the embodiment are specifically represented by that the room-temperature tensile yield strength is 120MPa, the tensile strength is 151MPa, the elongation is 8%, and the surface roughness is 0.023 mu m.
The 5A65 aluminum alloy strip prepared in example 1 was examined and analyzed by metallographic microscope, and the results are shown in FIG. 1 and FIG. 2.
Fig. 1 is a graph of the detection result under a metallographic microscope bright field, and it can be seen from the observation in fig. 1 that: the second phase is uniformly distributed and dispersed; fig. 2 is a graph of the detection result under the polarization of a metallographic microscope, and it can be seen from the observation in fig. 2 that: complete recrystallization of the bead portion and core portion structure has occurred.
Example 2
The preparation method of the 5A65 aluminum alloy strip of the embodiment comprises the following steps:
s1, casting: the aluminum alloy ingot is prepared by the following steps of proportioning 0.02% of Si, 0.025% of Fe, 0.05% of Cu, 0.015% of Mn, 0.01% of V, 0.025% of Zn, 0.012% of Ti, 0.8% of Mg and the balance of Al, melting aluminum into molten aluminum, adding magnesium and other alloy components, then forming alloy aluminum liquid through melting, refining, deslagging and degassing, and finally performing semi-continuous casting to obtain 500-550 mm 1100-1300 mm 5000-5500 mm aluminum alloy flat ingots;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, and then carrying out homogenization treatment in a push type heating furnace at the temperature of 500 ℃ for 2 hours;
s3, hot rolling: carrying out hot rough rolling on the alloy product subjected to homogenization treatment in the S2 at the initial rolling temperature of 420 ℃, and carrying out hot finish rolling at the final rolling temperature of 340 ℃ to ensure that the thickness of the alloy product subjected to hot finish rolling is 4.2-4.3 mm;
s4, first cold rolling: rolling the alloy product obtained in the step S3 by using a working roll with the roughness of 0.5 mu m, wherein the rolling speed is 200m/min, the rolling is carried out for three passes, and then, intermediate annealing treatment is carried out;
s5, secondary cold rolling: rolling the alloy product obtained in the step S4 by using a working roll with the roughness of 0.15 mu m, and continuously rolling for three passes at the rolling speed of 150m/min and the processing rate of 15-20% to obtain a finished product with the thickness of 0.5-0.7 mm and the general surface brightness;
s6, annealing of finished products: and (3) annealing the finished product for 5h at 230 ℃, and then straightening by stretching and bending to obtain the 5A65 aluminum alloy strip.
Through detection and analysis, the mechanical properties of the 5A65 aluminum alloy strip prepared by the embodiment are specifically represented by room-temperature tensile yield strength of 120MPa, tensile strength of 151MPa, elongation of 8% and surface roughness of 0.15 μm.
Comparing example 1 with example 2, it can be seen that the process steps of examples 1 and 2 are first cold rolling, straightening and cleaning, intermediate annealing, second cold rolling to the thickness of the finished product, straightening and semi-finished product, finished product annealing and straightening and finished product, except that the roughness of the roll used in the rolling process of example 2 is higher, so that the surface brightness of the finished aluminum alloy strip obtained in example 2 is deficient compared with that of example 1, and therefore, the effect of the roughness of the roll on the brightness of the surface of the aluminum alloy strip is explained.
The 5A65 aluminum alloy strip solves the problems that after being punched, the aluminum alloy strip prepared by the traditional process has tensile stripes on the surface and cannot be eliminated after being anodized, so that the aluminum alloy strip suitable for the highlight cosmetic bottle cap is prepared, and the quality requirement and the processing requirement of the market on products are met.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. A5A 65 aluminum alloy strip, characterized by consisting of, in weight percent: 0< Si < 0.04%, 0< Fe < 0.05%, 0< Cu < 0.1%, 0< Mn < 0.03%, 0< V < 0.02%, 0< Zn < 0.05%, 0< Ti < 0.025%, 0.7-0.9% of Mg, and the balance of Al and inevitable impurities, wherein the content of the impurities is less than 0.02%.
2. The 5A65 aluminum alloy strip of claim 1, consisting of, in weight percent: 0.02% of Si, 0.025% of Fe, 0.05% of Cu, 0.015% of Mn, 0.01% of V, 0.025% of Zn, 0.016% of Ti, 0.8% of Mg, the balance of Al and inevitable impurities, wherein the impurity content is less than 0.02%.
3. The method of making a 5a65 aluminum alloy strip of claim 1 or claim 2, comprising the steps of:
s1, casting: the method comprises the following steps of proportioning according to aluminum alloy components and weight percentage, melting aluminum into molten aluminum, adding magnesium and other alloy components, then forming alloy aluminum liquid through melting, refining, deslagging and degassing, and finally performing semi-continuous casting to obtain aluminum alloy flat ingots with the thickness of 500-550 mm 1100-1300 mm 5000-5500 mm;
s2, ingot casting homogenization treatment: sawing the head and the tail of a flat ingot, milling the surface of the flat ingot, and then carrying out homogenization treatment for 1.5-2.5 h at the temperature of 480-520 ℃;
s3, hot rolling: carrying out hot rough rolling on the alloy product subjected to homogenization treatment in S2 at the initial rolling temperature of 400-430 ℃, and carrying out hot finish rolling at the final rolling temperature of 330-350 ℃ to ensure that the thickness of the alloy product subjected to hot finish rolling is 4.1-4.5 mm;
s4, first cold rolling: rolling the alloy product obtained from S3 by using a working roll with the roughness of 0.4-0.5 mu m at the rolling speed of 200-300m/min for three passes, and then carrying out intermediate annealing treatment;
s5, secondary cold rolling: rolling the alloy product obtained in the step S4 by using a working roll with the roughness of 0.13-0.15 mu m, wherein the rolling speed is 100-200 m/min, and the processing rate is 20-30%; then reducing the roughness of the working roll, and continuously rolling for two passes at the rolling speed of 100-200 m/min and the processing rate of 15-20% to obtain a finished product;
s6, annealing of finished products: and (3) annealing the finished product for 5-5.5 hours at 230-240 ℃, and then stretching, bending and straightening to obtain the 5A65 aluminum alloy strip.
4. The method for preparing the 5A65 aluminum alloy strip according to claim 3, wherein the temperature of the ingot homogenization treatment in S2 is 500 ℃ and the time is 2 h.
5. The method of claim 3, wherein the start rolling temperature of the hot rough rolling is 420 ℃ and the finish rolling temperature of the hot finish rolling is 340 ℃ in the S3.
6. The method for preparing the 5A65 aluminum alloy strip according to claim 3, wherein in the S4, the temperature of the intermediate annealing treatment is 340-360 ℃, and the temperature is kept for 4-6 hours before discharging.
7. The method for preparing the 5A65 aluminum alloy strip according to the claim 3, wherein in the S5, the roughness of the working roll used in the two continuous rolling passes is less than 0.03 μm.
8. The method for preparing the 5A65 aluminum alloy strip according to claim 3, wherein in the S6, the surface roughness of the 5A65 aluminum alloy strip is less than 0.03 μm, the tensile strength is 135-155 MPa, the yield strength is 110-120 MPa, and the elongation is 5-10%.
9. Use of the 5a65 aluminum alloy strip of claim 1 or claim 2 as a highlight cosmetic bottle cap in the production of cosmetic bottles.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112501461A (en) * | 2020-10-23 | 2021-03-16 | 福耀科技发展(苏州)有限公司 | Preparation method of automotive high-gloss aluminum alloy exterior trim plate |
CN113637926A (en) * | 2021-08-13 | 2021-11-12 | 联想(北京)有限公司 | Rolling annealing process of 5-series aluminum alloy |
CN114134492A (en) * | 2021-12-02 | 2022-03-04 | 中铝西南铝板带有限公司 | Production process of aluminum alloy coated plate for food-grade can making |
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JPH06228690A (en) * | 1993-02-03 | 1994-08-16 | Nippon Steel Corp | High strength aluminum alloy clad excellent in formability |
JP5247996B2 (en) * | 2005-12-28 | 2013-07-24 | 三菱アルミニウム株式会社 | Aluminum alloy plate for can body excellent in circulation pinhole resistance and method for producing can body excellent in distribution pinhole resistance |
CN105324499A (en) * | 2013-06-17 | 2016-02-10 | 肯联铝业辛根有限责任公司 | Motor vehicle moulding ring made from aluminium/magnesium alloy |
CN109207818A (en) * | 2018-10-26 | 2019-01-15 | 中铝西南铝冷连轧板带有限公司 | A kind of car window frame bloom bright wisp 5505 aluminium alloy strips and preparation method thereof |
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JPH06228690A (en) * | 1993-02-03 | 1994-08-16 | Nippon Steel Corp | High strength aluminum alloy clad excellent in formability |
JP5247996B2 (en) * | 2005-12-28 | 2013-07-24 | 三菱アルミニウム株式会社 | Aluminum alloy plate for can body excellent in circulation pinhole resistance and method for producing can body excellent in distribution pinhole resistance |
CN105324499A (en) * | 2013-06-17 | 2016-02-10 | 肯联铝业辛根有限责任公司 | Motor vehicle moulding ring made from aluminium/magnesium alloy |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN112501461A (en) * | 2020-10-23 | 2021-03-16 | 福耀科技发展(苏州)有限公司 | Preparation method of automotive high-gloss aluminum alloy exterior trim plate |
CN113637926A (en) * | 2021-08-13 | 2021-11-12 | 联想(北京)有限公司 | Rolling annealing process of 5-series aluminum alloy |
CN114134492A (en) * | 2021-12-02 | 2022-03-04 | 中铝西南铝板带有限公司 | Production process of aluminum alloy coated plate for food-grade can making |
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Effective date of registration: 20210104 Address after: 401326 Chongqing Jiulongpo District West Industrial Park Applicant after: CHINALCO-SWA PLATES & STRIPS Co.,Ltd. Address before: 401326 Chongqing Jiulongpo District West Industrial Park Applicant before: CHINALCO-SWA COLD ROLLING Co.,Ltd. |
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RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200410 |