CN113278827A - Medium-strength easily-extruded 5-series aluminum alloy ingot - Google Patents
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- CN113278827A CN113278827A CN202110561972.8A CN202110561972A CN113278827A CN 113278827 A CN113278827 A CN 113278827A CN 202110561972 A CN202110561972 A CN 202110561972A CN 113278827 A CN113278827 A CN 113278827A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 72
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000012535 impurity Substances 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 13
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 24
- 238000007670 refining Methods 0.000 claims description 22
- 238000007872 degassing Methods 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 14
- 238000001125 extrusion Methods 0.000 abstract description 13
- 239000000956 alloy Substances 0.000 abstract description 10
- 229910045601 alloy Inorganic materials 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 description 15
- 239000011777 magnesium Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910016952 AlZr Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a medium-strength easily-extruded 5-series aluminum alloy ingot, which is mainly prepared by the following steps: 1) preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.8% -0.9%, Mg: 3.5% -3.8%, Cr: 0.15-0.20%, Zr: 0.08-0.13%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al; 2) adding the prepared aluminum alloy raw material into a smelting furnace to be melted into molten aluminum, and then casting into an aluminum alloy ingot; 3) and transferring the cast aluminum alloy ingot into a homogenizing furnace for homogenizing treatment, and cooling after homogenizing treatment. Practical production verifies that when the 5-series aluminum alloy cast ingot (aluminum bar) produced by the method is extruded, the deformation resistance is reduced by 10-15% compared with that of 5383 alloy under the same process condition, and the extrusion speed is improved by 30-50%.
Description
Technical Field
The invention relates to the technical field of heat treatment production of 5-series aluminum alloy, in particular to a preparation process of a medium-strength easily-extruded 5-series aluminum alloy ingot.
Background
Because the aluminum alloy has the characteristics of light weight (1/3 of steel), no rust, difficult corrosion and easy recycling, and simultaneously, the aluminum can improve the strength through work hardening or heat treatment, thereby realizing high strength-weight ratio; the aluminum alloy has good processing performance and is suitable for different production processes such as casting, extrusion, stamping, forging, machining and the like; the aluminum alloy can also be added with different alloy elements and strengthened to different degrees through a heat treatment process; the surface of the aluminum alloy is easy to form a compact oxide film and has good corrosion resistance; the aluminum alloy also has the characteristics of good electrical conductivity and thermal conductivity, no magnetism and the like; in addition, the aluminum alloy has very excellent recyclability. Therefore, aluminum alloy materials begin to develop gradually in manufacturing applications of ships and traffic light-weight.
Among them, the 5-series Al — Mg alloy is excellent in corrosion resistance, heat resistance, weldability, and plasticity, and also has moderate strength, and is suitable for welding, bending, forging, and the like, and is widely used in the application fields of ships, marine engineering, and special engineering.
However, the 5-series aluminum alloy has high content of solid solution Mg, so that the deformation resistance of the alloy is high in the extrusion process, so that the forming is difficult, and particularly, even if the high-strength 5-series alloy with high Mg content can be extruded, the production efficiency and the yield are obviously low, and the production cost is too high, so that the industrial mass production application cannot be realized.
Therefore, through the development and optimization of the components and the heat treatment process, the hot extrusion efficiency of the 5-series aluminum alloy is improved under the condition of ensuring that the strength, the plasticity, the welding performance and other properties of the alloy are qualified, and the important part of the application expansion of the aluminum alloy is provided.
Disclosure of Invention
The invention aims to provide a preparation process for an easily extruded 5-series aluminum alloy ingot with medium strength, which has lower deformation resistance and obviously improved extrusion speed in aluminum bar extrusion.
In order to achieve the purpose, the invention adopts the following technical scheme.
A medium-strength easily-extruded 5-series aluminum alloy ingot is characterized by being prepared by the following steps: 1) preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.8% -0.9%, Mg: 3.5% -3.8%, Cr: 0.15-0.20%, Zr: 0.08-0.13%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al; 2) adding the prepared aluminum alloy raw material into a smelting furnace to be melted into molten aluminum, and casting the molten aluminum into an aluminum alloy ingot after the steps of stirring, refining, degassing and filtering; 3) transferring the cast aluminum alloy ingot into a homogenizing furnace, heating to 430-450 ℃ at a heating speed of 3-5 ℃/min, preserving heat for 8-10 h, heating to 500-520 ℃ at a heating speed of 3-5 ℃/min, preserving heat for 20-24 h, and cooling after homogenizing treatment.
More preferably, in the step 1), the aluminum alloy raw material is prepared according to the following weight percentages: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.85%, Mg: 3.6%, Cr: 0.18%, Zr: 0.10%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al.
More preferably, in the step 1), an electromagnetic stirring device is used for stirring; of course, in some embodiments, other stirring devices that are currently available or that can be realized in the future may be used instead of the electromagnetic stirring device, depending on the actual needs.
More preferably, in step 1), the refining degassing is performed by using a refining agent. Of course, in some embodiments, according to different actual needs, some other existing or future-enabled refining degassing modes can be adopted to replace the refining agent for refining degassing.
More preferably, in step 1), a ceramic filter plate is used for the filtration. The ceramic filter plate has the advantage that the introduction of other metal impurities can be avoided as much as possible. Of course, in some embodiments, other existing or future available filter devices may be used instead of the ceramic filter plate, depending on the actual needs.
More preferably, in the step 2), during homogenizing, heating to 440 ℃ at a heating speed of 4 ℃/min, preserving heat for 8-10 h, heating to 510 ℃ at a heating speed of 4 ℃/min, and preserving heat for 22 h.
More preferably, in step 2), the cooling system is an air cooling system. The specific air cooling mode can be natural cooling or fan-assisted cooling.
The invention has the beneficial effects that: by adjusting the alloy components and the heat treatment process, the AlMn, AlCr and AlZr phases in the 5-series aluminum alloy are dispersed and precipitated more uniformly and sufficiently, and the recrystallization process of the alloy in the extrusion process is inhibited through the AlMn, AlCr and AlZr dispersed phases, so that the strength requirement of the combined action of solid solution strengthening and fine grain strengthening is met; meanwhile, the deformation resistance of the aluminum bar in the extrusion process is reduced by reducing the solid solution strengthening of the aluminum bar in combination with the reduction of the Mg component, so that the effect of improving the extrusion efficiency is achieved. Practical production verifies that when the 5-series aluminum alloy cast ingot (aluminum bar) produced by the method is extruded, the deformation resistance is reduced by 10-15% compared with 5383 alloy under the same process condition, the extrusion speed is improved by 30-50%, the tensile strength of the extruded finished section is reduced by 10% compared with 5383, but the yield strength can reach the same level, and the performance indexes are as follows: the hardness is more than or equal to 70HV, the tensile strength is more than or equal to 280Mpa, the yield strength is more than or equal to 200Mpa, the elongation after fracture is more than or equal to 13 percent, the loss of the welding strength is less than or equal to 10 percent, and the steel has excellent subsequent bending and welding processability.
Drawings
FIG. 1 is a SEM photograph showing the microstructure of an aluminum alloy ingot produced in example 1 of the present invention.
FIG. 2 is a SEM photograph showing the microstructure of the aluminum alloy ingot produced in comparative example 1.
FIG. 3 is a SEM photograph showing the microstructure of the aluminum alloy ingot produced in comparative example 2.
Detailed Description
The following describes the embodiments of the present invention with reference to the drawings of the specification, so that the technical solutions and the advantages thereof are more clear and clear. The embodiments described below are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Example 1.
A medium-strength easily-extruded 5-series aluminum alloy ingot is mainly prepared by the following steps.
1) Preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.85%, Mg: 3.6%, Cr: 0.18%, Zr: 0.10%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al.
Adding the prepared aluminum alloy raw material into a smelting furnace to be melted into aluminum liquid, uniformly stirring by using an electromagnetic stirring device, refining and degassing by using a refining agent, filtering impurities in the aluminum liquid by using a ceramic filter plate, and casting the aluminum liquid into an aluminum alloy ingot.
The electromagnetic stirring aims to enhance the integral stirring uniformity and avoid the conditions that magnesium elements in the high-magnesium aluminum alloy are not uniformly distributed and the hardness and the mechanical property of the extruded section are not uniform.
2) And transferring the cast aluminum alloy ingot into a homogenizing furnace, heating to 440 ℃ at a heating speed of 4 ℃/min, then preserving heat for 9h, heating to 510 ℃ at a heating speed of 4 ℃/min, and then preserving heat for 22 h. And cooling by using an air cooling mode after homogenizing treatment.
The special homogenizing treatment mode has the advantages that AlMn and AlCr in the ingot can be distributed in a dispersed mode, the pinning refining effect in the extrusion process is further improved, finer grain structures of the extruded section are obtained, and the mechanical property of the section is improved through the fine grain strengthening effect.
Example 2.
A medium-strength easily-extruded 5-series aluminum alloy ingot is mainly prepared by the following steps.
1) Preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.8%, Mg: 3.5%, Cr: 0.15%, Zr: 0.08%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al.
Adding the prepared aluminum alloy raw material into a smelting furnace to be melted into aluminum liquid, uniformly stirring by using an electromagnetic stirring device, refining and degassing by using a refining agent, filtering impurities in the aluminum liquid by using a ceramic filter plate, and casting the aluminum liquid into an aluminum alloy ingot. The electromagnetic stirring aims to enhance the integral stirring uniformity and avoid the conditions that magnesium elements in the high-magnesium aluminum alloy are not uniformly distributed and the hardness and the mechanical property of the extruded section are not uniform.
2) Transferring the cast aluminum alloy ingot into a homogenizing furnace, heating to 430 ℃ at a heating speed of 3 ℃/min, then preserving heat for 10h, heating to 500 ℃ at a heating speed of 3 ℃/min, then preserving heat for 24h, and cooling in an air cooling mode after homogenizing treatment. The special homogenizing treatment mode has the advantages that AlMn and AlCr in the ingot can be distributed in a dispersed mode, the pinning refining effect in the extrusion process is further improved, finer grain structures of the extruded section are obtained, and the mechanical property of the section is improved through the fine grain strengthening effect.
Example 3.
A medium-strength easily-extruded 5-series aluminum alloy ingot is mainly prepared by the following steps.
1) Preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.9%, Mg: 3.8%, Cr: 0.20%, Zr: 0.13%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al.
Adding the prepared aluminum alloy raw material into a smelting furnace to be melted into aluminum liquid, uniformly stirring by using an electromagnetic stirring device, refining and degassing by using a refining agent, filtering impurities in the aluminum liquid by using a ceramic filter plate, and casting the aluminum liquid into an aluminum alloy ingot. The electromagnetic stirring aims to enhance the integral stirring uniformity and avoid the conditions that magnesium elements in the high-magnesium aluminum alloy are not uniformly distributed and the hardness and the mechanical property of the extruded section are not uniform.
2) And transferring the cast aluminum alloy ingot into a homogenizing furnace, heating to 50 ℃ at a heating speed of 5 ℃/min, then preserving heat for 8h, heating to 520 ℃ at a heating speed of 5 ℃/min, then preserving heat for 20h, and cooling in an air cooling mode after homogenizing treatment. The special homogenizing treatment mode has the advantages that AlMn and AlCr in the ingot can be distributed in a dispersed mode, so that the pinning refining effect in the extrusion process is improved, finer grain structures of the extruded section are obtained, and the mechanical property of the section is improved through the fine grain strengthening effect.
To better demonstrate the advancement of the present invention, comparative experiments are conducted below.
Comparative example 1.
An aluminum alloy ingot is mainly prepared by the following steps: 1) preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.85%, Mg: 3.6%, Cr: 0.18%, Zr: 0.10%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al. 2) Adding the prepared aluminum alloy raw material into a smelting furnace to be melted into aluminum liquid, uniformly stirring by using an electromagnetic stirring device, refining and degassing by using a refining agent, filtering impurities in the aluminum liquid by using a ceramic filter plate, and casting the aluminum liquid into an aluminum alloy ingot. 3) Transferring the cast aluminum alloy ingot into a homogenizing furnace, and adopting a primary homogenizing treatment process of 510 ℃ x31 h. And cooling by using an air cooling mode after homogenizing treatment.
Comparative example 2.
1) Preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.85%, Mg: 3.6%, Cr: 0.18%, Zr: 0.10%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al. 2) Adding the prepared aluminum alloy raw material into a smelting furnace to be melted into aluminum liquid, uniformly stirring by using an electromagnetic stirring device, refining and degassing by using a refining agent, filtering impurities in the aluminum liquid by using a ceramic filter plate, and casting the aluminum liquid into an aluminum alloy ingot. 3) Transferring the cast aluminum alloy ingot into a homogenizing furnace, heating to 430 ℃ at a heating speed of 10 ℃/min, then preserving heat for 10h, heating to 500 ℃ at a heating speed of 10 ℃/min, then preserving heat for 24h, and cooling in an air cooling mode after homogenizing treatment.
SEM photographs of the microstructures of the aluminum alloy ingots prepared in example 1, comparative example 1 and comparative example 2 are shown in FIGS. 1 to 3, respectively.
From a comparison of fig. 1-3, it can be seen that: after the ingot is subjected to homogenization heat treatment, a large amount of white punctiform AlMn and AlCr phases are precipitated. In the heat treatment system of comparative example 2, the sizes of AlMn and AlCr phases are slightly larger than those of the AlMn and AlCr phases in example 1 and comparative example 1, so that the dispersion strengthening effect is reduced, and the mechanical properties of the profile are influenced. In example 1, compared with the heat treatment system of comparative example 1, the dispersed phases of AlMn and AlCr are more uniform in a small area, which is beneficial to the inhibition of recrystallization of the ingot during deformation and the improvement of strength after deformation.
Practical production verifies that when the 5-series aluminum alloy cast ingot (aluminum bar) produced by the method is extruded, the deformation resistance is reduced by 10-15% compared with 5383 alloy under the same process condition, the extrusion speed is improved by 30-50%, the tensile strength of the extruded finished section is reduced by 10% compared with 5383, but the yield strength can reach the same level, and the performance indexes are as follows: the hardness is more than or equal to 70HV, the tensile strength is more than or equal to 280Mpa, the yield strength is more than or equal to 200Mpa, the elongation after fracture is more than or equal to 13 percent, the loss of the welding strength is less than or equal to 10 percent, and the steel has excellent subsequent bending and welding processability.
It will be appreciated by those skilled in the art from the foregoing description of construction and principles that the invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the teachings of the art may be made without departing from the scope of the invention as defined by the appended claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.
Claims (7)
1. A medium-strength easily-extruded 5-series aluminum alloy ingot is characterized by being prepared by the following steps:
1) preparing an aluminum alloy raw material according to the following weight percentage: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.8% -0.9%, Mg: 3.5% -3.8%, Cr: 0.15-0.20%, Zr: 0.08-0.13%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al;
2) adding the prepared aluminum alloy raw material into a smelting furnace to be melted into molten aluminum, and casting the molten aluminum into an aluminum alloy ingot after the steps of stirring, refining, degassing and filtering;
3) transferring the cast aluminum alloy ingot into a homogenizing furnace, heating to 430-450 ℃ at a heating speed of 3-5 ℃/min, preserving heat for 8-10 h, heating to 500-520 ℃ at a heating speed of 3-5 ℃/min, preserving heat for 20-24 h, and cooling after homogenizing treatment.
2. The medium-strength easily-extruded 5-series aluminum alloy ingot according to claim 1, wherein in the step 1), the aluminum alloy raw materials are prepared according to the following weight percentages: si is less than or equal to 0.1 percent, Fe is less than or equal to 0.15 percent, Cu is less than or equal to 0.05 percent, Mn: 0.85%, Mg: 3.6%, Cr: 0.18%, Zr: 0.10%, Zn: less than or equal to 0.15 percent, Ti: less than or equal to 0.015 percent, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of impurity in total, and the balance of Al.
3. The medium-strength easily-extruded 5-series aluminum alloy ingot according to claim 1, wherein in the step 1), an electromagnetic stirring device is used for stirring.
4. The intermediate strength easily extruded 5-series aluminum alloy ingot according to claim 1, wherein in the step 1), refining degassing is performed by using a refining agent.
5. A medium strength easily extruded 5-series aluminum alloy ingot according to claim 1, wherein in step 1), the filter is a ceramic filter plate.
6. The medium-strength easily-extruded 5-series aluminum alloy ingot according to claim 1, wherein in the step 2), during homogenizing, the ingot is heated to 440 ℃ at a heating rate of 4 ℃/min, and is subjected to heat preservation for 8-10 h, then is heated to 510 ℃ at a heating rate of 4 ℃/min, and is subjected to heat preservation for 22 h.
7. The ingot according to claim 1, wherein the cooling in step 2) is air cooling.
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| CN113926873A (en) * | 2021-09-03 | 2022-01-14 | 福建祥鑫股份有限公司 | Extrusion forming process of rare earth modified high-strength corrosion-resistant 5-series aluminum profile |
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| CN110551928A (en) * | 2019-09-17 | 2019-12-10 | 新疆众和股份有限公司 | Production method of 5654 aluminum alloy welding wire blank |
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