CN117187636A - Production method of high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip - Google Patents
Production method of high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000000137 annealing Methods 0.000 claims abstract description 56
- 238000005097 cold rolling Methods 0.000 claims abstract description 40
- 238000005098 hot rolling Methods 0.000 claims abstract description 40
- 238000005452 bending Methods 0.000 claims abstract description 37
- 238000005266 casting Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000004321 preservation Methods 0.000 claims abstract description 11
- 238000003801 milling Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 4
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 32
- 229910045601 alloy Inorganic materials 0.000 abstract description 18
- 239000000956 alloy Substances 0.000 abstract description 18
- 230000000052 comparative effect Effects 0.000 description 15
- 229910052729 chemical element Inorganic materials 0.000 description 10
- 238000001953 recrystallisation Methods 0.000 description 10
- 238000011056 performance test Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 229910018134 Al-Mg Inorganic materials 0.000 description 3
- 229910018467 Al—Mg Inorganic materials 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a production method of a 5052 aluminum alloy cold-rolled sheet strip with high strength and high bending property, relates to the field of aluminum alloy manufacturing, and solves the technical problem that 5052 aluminum alloy cannot have high strength and high bending property at the same time. The technical proposal is as follows: the method comprises the following steps: casting, sawing, milling faces, heating, hot rolling, cold rolling, annealing and leveling; the aluminum alloy comprises the following chemical components in percentage by mass: less than or equal to 0.20 percent of Si, less than or equal to 0.30 percent of Fe, less than or equal to 0.10 percent of Cu, 0.05 to 0.10 percent of Mn, 2.70 to 2.80 percent of Mg,0.15 to 0.20 percent of Cr, less than or equal to 0.10 percent of Zn, 0.01 to 0.05 percent of Ti, less than or equal to 0.05 percent of other impurity elements, less than or equal to 0.15 percent of other impurity elements in total, and the balance of Al; the final rolling temperature of hot rolling is 270-300 ℃; the total cold rolling rate is more than or equal to 70 percent; the annealing temperature is 240-260 ℃ and the heat preservation time is 2-4 hours. The invention realizes high strength, good plasticity and bending property of the finished plate strip with fewer production procedures and lower production cost through reasonable matching of alloy element content, hot rolling finishing temperature, cold rolling total processing rate and annealing process.
Description
Technical Field
The invention relates to the technical field of aluminum alloy manufacturing, in particular to a production method of a 5052 aluminum alloy cold-rolled sheet strip with high strength and high bending property.
Background
The 5052 aluminum alloy belongs to an Al-Mg alloy, is one of the most widely used Al-Mg alloy, and mainly comprises the following chemical components according to the specification of national standard GB/T3190-2020 "deformed aluminum and aluminum alloy chemical components": 0 to 0.25 weight percent of Si,0 to 0.4 weight percent of Fe,0 to 0.1 weight percent of Cu,0 to 0.1 weight percent of Mn,2.2 to 2.8 weight percent of Mg,0.15 to 0.35 weight percent of Cr,0 to 0.1 weight percent of Zn and the balance of Al. The 5052 aluminum alloy has moderate strength and good forming property, corrosion resistance, welding property and fatigue resistance, so that the 5052 aluminum alloy is widely applied to the fields of electronic appliances, architectural decoration, transport vehicles, containers and the like, and has higher requirements on bending property of plate and strip materials in main processing modes such as bending, undercut and the like.
With the increasing demand for energy conservation and emission reduction, the requirement for improving the strength of 5052 aluminum alloy plate strips to realize thinning is raised. Al-Mg alloy is non-heat treatable reinforced alloy, and the main reinforcement modes are solid solution reinforcement and deformation reinforcement, wherein the two reinforcement modes generally lead to the reduction of plastic forming performance while improving strength, and aluminum alloy plates and strips are required to maintain higher bending performance in order to avoid cracking in the downstream product processing process. Therefore, the aluminum alloy plate strip with high strength and high bending property 5052 has urgent market demands and engineering values.
Chinese patent CN106637006B discloses a method for improving cold rolling state plasticity of 5052 aluminum alloy, by adding 0.01-0.05% sr into 5052 aluminum alloy, performing "cold rolling → intermediate annealing → cold rolling" processing on recrystallized slab prepared by hot rolling and heat treatment process, and matching with reasonable process parameters, the tensile strength of finished product is improved, but the elongation is low and the bending property is yet to be studied; meanwhile, the production method has high production cost due to the need of adding rare earth elements and more production procedures.
Chinese patent application CN113528903a discloses a method for preparing 5052 aluminum alloy with high bending property, which comprises the steps of reasonably controlling the content of alloy elements, and carrying out sequential processing of 'casting, homogenization, hot rolling, cold rolling, withdrawal, straightening, cleaning, annealing, transverse cutting' and matching with reasonable technological parameters to improve the bending property. However, the hot rolling thickness and the total cold rolling reduction rate are limited by 30 percent, and the hot rolling method can only be applied to thicker products, has lower strength and can only reach 5052-H22/H32 state performance specified in GB/T3880.2.
Disclosure of Invention
Aiming at the defects, the invention provides a production method of a 5052 aluminum alloy cold-rolled sheet strip with high strength and high bending property, which can overcome the defect that 5052 aluminum alloy cannot have high strength, high plasticity and high bending property at the same time, and the specific technical scheme is as follows:
a production method of a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip comprises the following steps: casting, sawing, milling faces, heating, hot rolling, cold rolling, annealing and leveling;
in the casting step, the aluminum alloy comprises the following chemical components in percentage by mass: less than or equal to 0.20 percent of Si, less than or equal to 0.30 percent of Fe, less than or equal to 0.10 percent of Cu, 0.05 to 0.10 percent of Mn, 2.70 to 2.80 percent of Mg,0.15 to 0.20 percent of Cr, less than or equal to 0.10 percent of Zn, 0.01 to 0.05 percent of Ti, less than or equal to 0.05 percent of other impurity elements, less than or equal to 0.15 percent of other impurity elements in total, and the balance of Al;
in the hot rolling step, the final rolling temperature of hot rolling is 270-300 ℃;
in the cold rolling step, the hot rolled coil blank is cold-rolled to the thickness of a finished product, and the total cold rolling processing rate is more than or equal to 70%;
in the annealing step, the annealing temperature is 240-260 ℃ and the heat preservation time is 2-4 hours.
In the production method of the aluminum alloy cold-rolled sheet strip with high strength and high bending property 5052, the heating temperature of the cast ingot is 480-510 ℃ and the heat preservation time is 2-8 hours in the heating step.
In the production method of the aluminum alloy cold-rolled sheet strip with high strength and high bending property 5052, the thickness of the hot-rolled coil blank in the hot rolling step is equal to or more than 70% of cold rolling reduction ratio reserved on the basis of the thickness of a finished product.
Further, in the production method of the high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip, in the leveling step, the aluminum coil is leveled by a stretch-bending straightener or is leveled by a transverse cutting machine and then sheared into a sheet material.
The strength and plasticity of aluminum magnesium alloys are mainly affected by alloy components, the work hardening degree generated in the rolling process, the recrystallization degree generated in the annealing process, and the like. Mn, mg and Cr are main alloy elements of the 5052 aluminum alloy, and proper addition can play a solid solution strengthening role to improve the strength, and meanwhile, the plasticity is not reduced too much. The aluminum alloy is work hardened during the cold rolling process, and the strength of the aluminum alloy plate strip is improved but the plasticity and bending property are reduced as the total working rate of the cold rolling increases. Recovery and recrystallization occur when annealing is performed after cold rolling, and the recovery and recrystallization degree is improved when the annealing temperature is higher and the heat preservation time is longer in a certain range, so that the strength of the aluminum plate strip is reduced, and the plasticity and bending property are improved. Since the recrystallization temperature is affected by the alloy composition, the internal structure of the material after cold rolling, and the like, and the recrystallization nuclei are preferentially formed at the position of the maximum distortion in the metal, the nucleation becomes easier as the rolling deformation amount is larger, and the recrystallization temperature interval becomes narrower as the corresponding recrystallization temperature is lower. The coil after hot rolling is cooled down in a lower line can form partial recrystallization structure by reasonably controlling the hot rolling finishing temperature, fiber structures with different deformation degrees are generated among different crystal grains after the subsequent cold rolling, and certain difference exists in recrystallization temperature, so that partial recrystallization structure can be formed in a wider annealing temperature range, and the annealing process window is enlarged while the plasticity of the annealed aluminum alloy is improved. Therefore, by reasonably controlling the content of alloy elements, the hot rolling finishing temperature, the total cold rolling processing rate and the annealing process, the 5052 aluminum alloy cold-rolled sheet strip with high strength and high bending property can be produced, and therefore, the strength, the plasticity and the bending property of the aluminum alloy sheet strip can be simultaneously improved by controlling the total cold rolling processing rate to be more than or equal to 70 percent and combining the annealing process with the annealing temperature of 240-260 ℃ and the heat preservation time of 2-4 hours.
Another object of the present invention is to provide a 5052 aluminum alloy cold-rolled sheet strip prepared by the above production method.
Further, the 5052 aluminum alloy cold-rolled sheet strip provided by the invention has the thickness of less than or equal to 2.0mm.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the production method of the high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip, provided by the invention, through reasonable matching of alloy element content, hot rolling finishing temperature, cold rolling total processing rate and annealing process, the produced 5052 aluminum alloy cold-rolled sheet strip is high in strength, good in plasticity and bending property, the strength meets the 5052-H26 state requirements specified by GB/T3880.2, and meanwhile, the plasticity and bending property meet the 5052-H22 state requirements specified by GB/T3880.2.
2. According to the production method of the high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip, rare earth elements are not added in the production process, and processes such as ingot homogenization treatment and intermediate annealing are not needed, so that the production flow is shortened, and meanwhile, the production cost is greatly reduced.
Detailed Description
The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments.
Example 1
The embodiment provides a production method of a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip, which comprises the following production steps: casting, sawing, face milling, heating, hot rolling, cold rolling, annealing and leveling.
(1) And (3) casting: the mass percentages of the chemical elements of the cast ingots after casting are shown in Table 1
Table 1 shows the mass percentages of the chemical elements of the ingot of example 1
(2) Heating: the ingot was heated to 480 ℃ and then incubated for 5 hours.
(3) And (3) hot rolling: the final rolling temperature of the hot rolling is 270 ℃, and the thickness of the hot rolled blank is 4.0mm.
(4) Cold rolling: the hot-rolled stock was rolled to 1.0mm and the total working rate was 75%.
(5) Annealing: the temperature of the coiled material is 240-260 ℃ and the heat preservation time is 2-4 hours.
The properties of 5052 aluminum alloy cold-rolled sheet strips prepared in example 1 under different annealing processes were tested, and the results are shown in table 2.
Table 2 shows the results of the performance test of 5052 aluminum alloy cold-rolled sheet strip prepared in example 1 under different annealing processes
| Annealing process | Rm/MPa | Rp 0.2 /MPa | A/％ | 180 DEG bending without crackingRadius/mm |
| 240℃×2h | 271 | 220 | 12 | 0.5 |
| 240℃×4h | 268 | 216 | 13 | 0.5 |
| 250℃×2h | 267 | 211 | 13 | 0.5 |
| 250℃×4h | 263 | 205 | 13 | 0.5 |
| 260℃×2h | 259 | 203 | 14 | 0.5 |
| 260℃×4h | 257 | 197 | 14 | 0.5 |
As can be seen from the data in Table 2, rm is greater than or equal to 255 MPa, rp 0.2 Not less than 197MPa, and the strength meets the 5052-H26 requirement specified in GB/T3880.2; a is more than or equal to 12%, the aluminum plate strip does not crack after being bent at 180 degrees with the radius being 0.5 times of the thickness of the aluminum plate strip, the plasticity and bending property meet the 5052-H22 requirement specified by GB/T3880.2, and the production method provided by the embodiment is proved to have the advantages that the strength of the prepared 5052 aluminum alloy cold-rolled plate strip is high, the plasticity and bending property are good by reasonably controlling the alloy element content, the hot rolling finish rolling temperature is 270 ℃, the total cold rolling processing rate is 75%, and the annealing temperature is kept for 2-4 hours within the range of 240-260 ℃.
Example 2
The embodiment provides a production method of a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip, which comprises the following production steps: casting, sawing, face milling, heating, hot rolling, cold rolling, annealing and leveling.
(1) And (3) casting: the mass percentages of the chemical elements of the cast ingots after casting are shown in Table 3.
Table 3 shows the mass percentages of the chemical elements of the cast ingot of example 2
(2) Heating: the ingot was heated to 510 ℃ and then incubated for 8 hours.
(3) And (3) hot rolling: the final rolling temperature of the hot rolling is 300 ℃, and the thickness of the hot rolled blank is 7.0mm.
(4) Cold rolling: the hot rolled stock was rolled to 2.0mm and the total working rate was 71%.
(5) Annealing: the temperature of the coiled material is 240-260 ℃ and the heat preservation time is 2-4 hours.
The properties of 5052 aluminum alloy cold-rolled sheet strips prepared in example 2 under different annealing processes were tested, and the results are shown in table 4.
Table 4 shows the results of the performance test of 5052 aluminum alloy cold-rolled sheet strip prepared in example 2 under different annealing processes
| Annealing process | Rm/MPa | Rp 0.2 /MPa | A/％ | 180 DEG bend non-cracking radius/mm |
| 240℃×2h | 277 | 229 | 13 | 1.0 |
| 240℃×4h | 272 | 223 | 13 | 1.0 |
| 250℃×2h | 273 | 221 | 14 | 1.0 |
| 250℃×4h | 270 | 217 | 14 | 1.0 |
| 260℃×2h | 262 | 206 | 15 | 1.0 |
| 260℃×4h | 259 | 195 | 15 | 1.0 |
As is clear from the data in Table 4, rm is not less than 255 MPa, rp 0.2 More than or equal to 195MPa, and the strength meets the 5052-H26 requirement specified by GB/T3880.2; a is more than or equal to 13 percent, the aluminum plate strip is not cracked after being bent at 180 degrees with the radius being 0.5 times of the thickness of the aluminum plate strip, and the plasticity and bending property meet the 5052-H22 requirement specified by GB/T3880.2. By reasonably controlling the content of alloy elements, the hot rolling finishing temperature of 300 ℃ and the total cold rolling processing rate of 71%, and the annealing temperature of 240-260 ℃ for 2-4 hours, the prepared 5052 aluminum alloy cold-rolled sheet strip has high strength, good plasticity and good bending property.
Example 3
The embodiment provides a production method of a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip, which comprises the following production steps: casting, sawing, face milling, heating, hot rolling, cold rolling, annealing and leveling.
(1) And (3) casting: the mass percentages of the chemical elements of the cast ingots after casting are shown in Table 5.
Table 5 shows the mass percentages of the chemical elements of the ingot of example 3
(2) Heating: the ingot was heated to 500 ℃ and then incubated for 2 hours.
(3) And (3) hot rolling: the final rolling temperature of hot rolling is 285 ℃, and the thickness of the hot rolled blank is 3.0mm.
(4) Cold rolling: the hot-rolled stock was rolled to 0.5mm and the total working ratio was 83%.
(5) Annealing: the temperature of the coiled material is 240-260 ℃ and the heat preservation time is 2-4 hours.
The properties of 5052 aluminum alloy cold-rolled sheet strips prepared in example 3 under different annealing processes were tested, and the results are shown in table 6.
Table 6 shows the results of performance tests of 5052 aluminum alloy cold-rolled sheet strip prepared in example 3 under different annealing processes
| Annealing process | Rm/MPa | Rp 0.2 /MPa | A/％ | 180 DEG bend non-cracking radius/mm |
| 240℃×2h | 275 | 223 | 11 | 0.25 |
| 240℃×4h | 271 | 218 | 11 | 0.25 |
| 250℃×2h | 271 | 218 | 12 | 0.25 |
| 250℃×4h | 268 | 215 | 12 | 0.25 |
| 260℃×2h | 260 | 209 | 12 | 0.25 |
| 260℃×4h | 258 | 201 | 12 | 0.25 |
As can be seen from the data in Table 6, rm is greater than or equal to 258MPa, rp 0.2 More than or equal to 201MPa, and the strength meets the 5052-H26 requirement specified by GB/T3880.2; a is more than or equal to 11%, the aluminum plate strip does not crack after being bent at 180 degrees with the radius being 0.5 times of the thickness of the aluminum plate strip, and the plasticity and bending property meet the 5052-H22 requirement specified by GB/T3880.2. By reasonably controlling the content of alloy elements, the hot rolling finishing temperature of 285 ℃ and the total cold rolling processing rate of 83%, and the annealing temperature of 240-260 ℃ for 2-4 hours, the prepared 5052 aluminum alloy cold-rolled sheet strip has high strength, good plasticity and good bending property.
Comparative example 1
The comparative example provides a production method of a 5052 aluminum alloy cold-rolled sheet strip, which comprises the following production steps: casting, sawing, face milling, heating, hot rolling, cold rolling, annealing and leveling.
(1) And (3) casting: the mass percentages of the chemical elements of the cast ingots after casting are shown in Table 7.
Table 7 shows the mass percentages of the chemical elements of the ingot of comparative example 1
(2) Heating: the ingot was heated to 480 ℃ and then incubated for 5 hours.
(3) And (3) hot rolling: the final rolling temperature of the hot rolling is 270 ℃, and the thickness of the hot rolled blank is 4.0mm.
(4) Cold rolling: the hot-rolled stock was rolled to 1.0mm and the total working rate was 75%.
(5) Annealing: the temperature of the coiled material is 240-260 ℃ and the heat preservation time is 2-4 hours.
The properties of 5052 aluminum alloy cold-rolled sheet strips prepared in comparative example 1 under different annealing processes were tested, and the results are shown in table 8.
Table 8 shows the results of the performance test of 5052 aluminum alloy cold-rolled sheet strip prepared in comparative example 1 under different annealing processes
| Annealing process | Rm/MPa | Rp 0.2 /MPa | A/％ | 180 DEG bend non-cracking radius/mm |
| 240℃×2h | 255 | 204 | 10 | 1.0 |
| 240℃×4h | 252 | 203 | 10 | 1.0 |
| 250℃×2h | 251 | 201 | 11 | 1.0 |
| 250℃×4h | 247 | 196 | 11 | 1.0 |
| 260℃×2h | 243 | 195 | 12 | 1.0 |
| 260℃×4h | 241 | 191 | 12 | 1.0 |
Comparative example 1 is mainly characterized by the variation of the alloy element content compared with examples 1 to 3, and in comparative example 1, the Cu content is 0.011%, the Mn content is 0.023% and the Cr content is 0.226%, and as can be seen from the data of Table 8, the three element contents are more, and the strength and elongation after break after annealing at 240 to 250 ℃ are obviously lower than those of examples 1 to 3; the elongation and bending property of the alloy after being annealed at 260 ℃ are greatly improved, but the strength is also greatly reduced. From this, it is clear that the 5052 aluminum alloy cold-rolled sheet strip prepared in this comparative example cannot satisfy higher strength, plasticity and bending property at the same time.
Comparative example 2
The comparative example is a production method of 5052 aluminum alloy cold-rolled sheet strip, comprising the following production steps: casting, sawing, face milling, heating, hot rolling, cold rolling, annealing and leveling.
(1) And (3) casting: the mass percentages of the chemical elements of the cast ingots after casting are shown in Table 9
TABLE 9 mass percent chemical elements for comparative example 2 ingots
(2) Heating: the ingot was heated to 480 ℃ and then incubated for 5 hours.
(3) And (3) hot rolling: the final rolling temperature of hot rolling is 330 ℃, and the thickness of the hot rolled blank is 2.5mm.
(4) Cold rolling: the hot-rolled blank was rolled to 1.0mm and the total working ratio was 60%.
(5) Annealing: the temperature of the coiled material is 230-270 ℃ and the heat preservation time is 2-4 hours.
The properties of 5052 aluminum alloy cold-rolled sheet strips prepared in comparative example 2 under different annealing processes were tested, and the results are shown in table 10.
Table 10 shows the performance test results of 5052 aluminum alloy cold-rolled sheet strip prepared in comparative example 2 under different annealing processes
Comparative example 2 is mainly characterized by the difference between the hot rolling finish rolling temperature and the total cold rolling reduction and annealing temperature compared with examples 1 to 3, and as can be seen from the data in table 10, the alloy has lower elongation after breaking after annealing at 230 ℃ and lower bending property, and when the annealing temperature is 240 to 260 ℃, the strength, elongation and bending property are far less than those of examples 1 to 3 because the hot rolling finish rolling temperature is 330 ℃ and the total cold rolling reduction is 60%; the strength after annealing at more than 260 ℃ is lower. From this, it is clear that the 5052 aluminum alloy cold-rolled sheet strip prepared in this comparative example cannot satisfy higher strength, plasticity and bending property at the same time.
In summary, the invention can produce 5052 aluminum alloy cold-rolled sheet strips with high strength, high plasticity and high bending property by reasonably controlling the content of alloy elements, the hot rolling finishing temperature, the total cold rolling processing rate and the annealing process, and the production method provided by the invention does not add rare earth elements, does not need processes such as ingot homogenization treatment, intermediate annealing and the like, shortens the production flow, and greatly reduces the production cost.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. The production method of the aluminum alloy cold-rolled sheet strip with high strength and high bending property 5052 is characterized by comprising the following steps of: casting, sawing, milling faces, heating, hot rolling, cold rolling, annealing and leveling;
in the casting step, the aluminum alloy comprises the following chemical components in percentage by mass: less than or equal to 0.20 percent of Si, less than or equal to 0.30 percent of Fe, less than or equal to 0.10 percent of Cu, 0.05 to 0.10 percent of Mn, 2.70 to 2.80 percent of Mg,0.15 to 0.20 percent of Cr, less than or equal to 0.10 percent of Zn, 0.01 to 0.05 percent of Ti, less than or equal to 0.05 percent of other impurity elements, less than or equal to 0.15 percent of other impurity elements in total, and the balance of Al;
in the hot rolling step, the final rolling temperature of hot rolling is 270-300 ℃;
in the cold rolling step, the total cold rolling processing rate is more than or equal to 70 percent;
in the annealing step, the annealing temperature is 240-260 ℃, and the annealing heat preservation time is 2-4 hours.
2. The method for producing a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip according to claim 1, wherein in the heating step, the ingot heating temperature is 480 to 510 ℃.
3. The method for producing a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip according to claim 2, wherein in the heating step, the ingot is heated for a holding time of 2 to 8 hours.
4. The method for producing a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip according to claim 1, wherein in the hot rolling step, the thickness of the hot-rolled coil blank is set to a cold rolling reduction ratio of not less than 70% on the basis of the thickness of the finished product.
5. The method for producing a high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip according to claim 1, wherein in the leveling step, the aluminum coil is leveled by a stretch-bending leveler or cut into a sheet material after being leveled by a transverse cutting machine.
6. A 5052 aluminum alloy cold rolled sheet strip produced by the production method of any one of claims 1 to 5.
7. The 5052 aluminum alloy cold rolled sheet strip of claim 6, wherein the 5052 aluminum alloy cold rolled sheet strip has a thickness of 2.0mm or less.
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| CN202311113963.8A CN117187636A (en) | 2023-08-31 | 2023-08-31 | Production method of high-strength high-bending-property 5052 aluminum alloy cold-rolled sheet strip |
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