CN111270116B - Preparation method of Al-Cu-Mg alloy oversized ingot - Google Patents
Preparation method of Al-Cu-Mg alloy oversized ingot Download PDFInfo
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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
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/18—Alloys based on aluminium with copper as the next major constituent with zinc
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0406—Moulds with special profile
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C22C21/14—Alloys based on aluminium with copper as the next major constituent with silicon
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- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
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Abstract
The invention provides a preparation method of an Al-Cu-Mg alloy oversized ingot, which comprises the following steps: sequentially carrying out material preparation, smelting, component adjustment, melt purification, grain refinement, casting and saw cutting; the temperature of cooling water in the casting process is 20-26 ℃, and the flow of the cooling water is 85-105 m3The casting speed is 44-46 mm/min. According to the invention, the temperature, the flow and the casting speed of the cooling water are accurately controlled, so that the prepared alloy is not easy to generate stress concentration, the cooling uniformity is good, the ingot cracking and the subcutaneous cracking are not easy to occur, and the yield is high.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to a preparation method of an Al-Cu-Mg alloy oversized ingot.
Background
At present, 480-520 mm thick and 1900-2100 mm wide alloy is produced according to conventional small-specification cast ingots, so that the alloy is easy to generate stress concentration, the cooling uniformity is insufficient, cast ingot cracking and subcutaneous cracks are easy to occur, the cast ingot is difficult to form, the scrap amount after processing is large, and the requirement of users on batch production of cast ingots cannot be met.
Disclosure of Invention
In view of the above, the invention aims to provide a preparation method of an Al-Cu-Mg alloy oversized ingot, and the ingot prepared by the method provided by the invention has a high yield and can meet the user requirements.
The invention provides a preparation method of an Al-Cu-Mg alloy oversized ingot, which comprises the following steps:
the method comprises the steps of material preparation, smelting, component adjustment, melt purification, grain refinement, casting and saw cutting.
In the invention, aluminum ingots or primary waste materials are preferably used for feeding in the batching process. The alloy raw materials adopted in the batching process are not particularly limited, and a person skilled in the art can select a simple substance or an alloy containing required elements as the alloy raw materials to be batched according to the components of the aluminum alloy to be prepared.
In the invention, the mass content of Si in the material preparation process is preferably controlled to be less than or equal to 0.10 percent; the mass content of Fe is preferably controlled to be less than or equal to 0.25 percent; the mass content of Cu is preferably controlled to be 4.1-4.9%, more preferably 4.3-4.7%, and most preferably 4.35-4.65%; the mass content of Mn is preferably controlled to be 0.4-0.8%, more preferably 0.5-0.7%, and most preferably 0.55-0.65%; the mass content of Mg is preferably controlled to be 1.3-1.8%, more preferably 1.4-1.7%, and most preferably 1.45-1.65%; the mass content of other elements is preferably controlled to not more than 0.15%.
In the invention, the smelting process preferably comprises furnace refining, wherein the temperature of the furnace refining is preferably 710-730 ℃, more preferably 715-725 ℃, and most preferably 720 ℃; the time for refining in the furnace is preferably 15-30 min, and more preferably 20-30 min; the smelting process preferably further comprises online degassing refining, wherein the online degassing refining is preferably argon, and the online degassing refining is preferably carried out at 710-725 ℃ and more preferably at 710-720 ℃; the temperature of the online filtering in the online degassing refining process is preferably 700-720 ℃, more preferably 705-720 ℃, and most preferably 705-715 ℃.
In the present invention, the component adjustment is preferably: sampling and analyzing after the alloy is melted, and adjusting the mass contents of Si, Fe, Cu, Mn and Mg to the component range of the aluminum alloy to be obtained in advance or the component content range in the batching process; the mass content of Ti is adjusted to 0.012-0.018%, more preferably 0.014-0.016%.
In the present invention, the melt purge is preferably: adopt nitrogen chlorine mist to refine the degasification in the stove, adopt argon gas to refine the degasification on line, adopt board-like or deep bed to remove the sediment on line simultaneously, ensure that the fuse-element purity reaches the requirement.
In the invention, the grain refiner is preferably added according to 1.1-1.3 kg/ton, more preferably 1.2 kg/ton, namely 1.1-1.3 kg of grain refiner is added in each ton of alloy liquid in the grain refining process. The specific components of the grain refiner are not particularly limited in the present invention, and those skilled in the art can select a grain refiner with a suitable composition according to actual conditions, and the grain refiner can be obtained commercially.
In the invention, the casting speed in the casting process is preferably 44-46 mm/min, and more preferably 45 mm/min; the cooling water flow is preferably 85-105 m3More preferably 90 to 100m3H, most preferably 95m3H; the casting temperature is preferably 710 to 730 ℃, more preferably 710 to 725 ℃, and most preferably 710 to 720 ℃.
In the present invention, it is preferable that the cooling effect is optimized by controlling the corresponding cooling water flow rate according to the variation of the cooling water temperature during the casting process, and the cooling water flow rate is preferably 95m at 23 ℃3And/h, the cooling water flow is preferably increased or decreased by 2 percent for every 1 ℃ increase or decrease of the cooling water, so that the cooling effect is optimal.
In the present invention, the structure of the cooling water jacket adopted in the casting process is preferably as shown in fig. 1, and includes a water cavity, a pipeline communicated with an outlet of the water cavity, and a casting tool (crystallizer) installation station communicated with an outlet of the pipeline; the water cavity is preferably made of stainless steel, the pipeline is provided with a ball valve, and the pipeline is preferably made of rubber; in the casting process, cooling water enters a water cavity of the cooling water jacket through a water supply system of the casting machine and then enters a casting tool (crystallizer) through components such as a ball valve, a rubber pipe (pipeline) and the like, the whole water channel is made of stainless steel, rubber or aluminum alloy and the like, the whole water channel is not easy to rust in the production process, and impurities such as rust and the like are prevented from entering the casting tool to block water holes to influence the cooling of cast ingots.
In the present invention, the cooling water jacket is preferably an integral body of a plurality of cooling water jackets so that four sets of casting tools (molds) can be mounted according to a plurality of casting tools (molds), more preferably an integral body of four cooling water jackets, preferably having a size of 5000 × 4000 × 200mm as shown in fig. 2.
In the invention, different cooling water is preferably selected for cooling according to the temperature change of the cooling water in the casting process; the cooling water used in the casting process comprises circulating water (industrial water) and fresh water (production water), the temperature of the circulating water changes along with seasonal changes, the temperature fluctuates within the range of 20-35 ℃, the temperature change of the fresh water is small and generally does not exceed 26 ℃, a water supply system in the casting process is connected with the circulating water and the fresh water at the same time, temperature measurement is carried out at a water inlet, the circulating water is used as the cooling water when the temperature of the water is lower than 26 ℃, and the circulating water is switched into the fresh water as the cooling water when the temperature of the water exceeds 26 ℃.
In the invention, the crystallizer used in the casting process is preferably an arc-shaped facet crystallizer, the result schematic diagram is shown in fig. 3, and the arc radius of the arc-shaped facet crystallizer is preferably 350-600 mm, more preferably 400-550 mm, and most preferably 450-500 mm according to the difference of the width and the thickness of the ingot to be prepared; the arc-shaped facet crystallizer is preferably made of aluminum alloy, and the size of the arc-shaped facet crystallizer is preferably 2600 multiplied by 800 multiplied by 140 mm.
According to the invention, the small face of the casting tool (crystallizer) is designed into an arc structure from a straight structure (as shown in figure 4, figure 4 is a straight small face crystallizer in the prior art), so that the stress concentration phenomenon of the small face of the cast ingot in the casting process can be effectively reduced, and the casting crack or rolling crack phenomenon can be reduced.
In the invention, the crystallizer with a certain radian facet structure and the stainless steel cooling water jacket are adopted, so that the requirement of ingot cracking is reduced, the service life of a tool is prolonged, the production efficiency is improved, and the production cost is reduced.
In the invention, the temperature of the tail end of the flow plate is preferably controlled to be 690-705 ℃ in the casting process, and more preferably 690-700 ℃.
In the present invention, the composition of the ingot obtained after completion of the casting is preferably:
0-0.10 Wt% Si;
0-0.25 Wt% Fe;
4.3-4.7 Wt% of Cu;
0.5-0.7 Wt% Mn;
1.4-1.7 Wt% Mg;
0-0.15 Wt% Zn;
0-0.05 Wt% of Ti;
the balance being Al.
In the invention, the mass content of Si is preferably 0.02-0.09%, more preferably 0.04-0.08%; the mass content of the Fe is preferably 0.08-0.25%, and more preferably 0.08-0.20%; the mass content of Cu is preferably 4.35-4.65%; the mass content of Mn is preferably 0.55-0.65%; the mass content of Mg is preferably 1.45-1.65%; the mass content of Zn is preferably less than or equal to 0.12 percent, and more preferably less than or equal to 0.10 percent; the mass content of Ti is preferably 0.01-0.04%, more preferably 0.15-0.25%.
In the present invention, the size of the ingot obtained after the completion of casting is preferably 480 to 520 mm in thickness and 1900 to 2100mm in width.
In the invention, the cast ingot obtained after casting is sent to the subsequent process after being sawed, qualified by chemical composition and high-low power detection.
The preparation method of the Al-Cu-Mg alloy oversized ingot provided by the invention uses a small-face structure casting tool with a certain radian to replace a small-face straight-face structure tool; the casting cooling water jacket is made of stainless steel, the structure is redesigned and optimized, the blockage of generated impurities is avoided, and the cooling uniformity is improved; the used cooling water is controlled within a certain temperature range (20-26 ℃), and different cooling water is selected according to the temperature change of the cooling water; confirming the speed operation of the casting machine before production to ensure that the casting speed can meet the control requirement of 45 +/-1 mm/min; making a corresponding water flow corresponding control table according to the temperature change of the cooling water; reasonably controlling the temperature of the furnace, the degassing chamber and the filtering basin and preheating the launder and the flow plate, reducing temperature fluctuation and ensuring the tail end temperature of the flow plate to be 690-705 ℃; through the implementation of the process, the ingot with the thickness of 480-520 multiplied by the width of 1900-2100 mm can be formed, the defect of cracking during rolling is avoided, and the requirement of a user on an oversized ingot is met.
The invention comprises the appearance design, material and structure of the casting water jacket; the casting process range is characterized in that casting parameters, namely water temperature of 20-26 ℃ and a flow corresponding control table are adopted, the casting speed is 45 +/-1 mm/min, and the temperature of the tail end of a flow plate is 690-705 ℃; the temperature, flow, casting speed and melt temperature of cooling water are accurately controlled; meanwhile, the material and the structure of the casting tool influencing the cooling uniformity are controlled, and an arc-shaped small surface structure tool is selected; through carrying out optimal design to casting instrument appearance design, material and structure, carry out accurate control to cooling water temperature, flow, casting speed, fuse-element temperature, make the difficult production stress concentration of alloy of preparation to the cooling homogeneity is better, is difficult for appearing ingot casting fracture and subcutaneous crack, and the yield is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of a cooling water jacket;
FIG. 2 is a schematic diagram of the overall structure of four cooling water jackets;
FIG. 3 is a schematic view of the structure of an arc facet mold;
FIG. 4 is a schematic view of a straight facet mold.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Sequentially carrying out batching, smelting, component adjustment, melt purification, grain refinement, casting and saw cutting to obtain an Al-Cu-Mg alloy ultra-large specification ingot;
the mass content of Si is controlled to be less than or equal to 0.10 percent and the mass content of Fe is controlled to be less than or equal to 0.25 percent in the burdening process; 4.1-4.9% of Cu, 0.4-0.8% of Mn, 1.3-1.8% of Mg and no more than 0.15% of other elements.
The temperature of refining in the furnace in the smelting process is 710 ℃, and the time of refining in the furnace is 15 min; the refining gas of the online degassing refining is argon, the temperature of the online degassing refining is 710 ℃, and the temperature of the online filtering is 700 ℃.
The components are adjusted to be sampled and analyzed after the alloy raw materials are completely melted, the mass content of Si, Fe, Cu, Mn and Mg is adjusted to be within the range of the component content of the ingot alloy which is obtained in advance, and the mass content of Ti is adjusted to be 0.015%.
The melt purification is that the melt is refined by nitrogen and chlorine in a furnace for 20min, Ar gas is used on line, and the gas flow is 4.0m3/h。
In the grain refining process, an online grain refiner is added according to 1.2 kg/ton, and the grain refiner comprises 5.0% of Ti by mass, 0.9% of B by mass and the balance of Al.
The casting speed in the casting process is 44mm/min, the casting temperature is 710 ℃, the temperature at the tail end of the control flow plate is 690 ℃, the cooling water jacket used in the casting process is shown in figures 1 and 2, the crystallizer is an arc-shaped facet crystallizer shown in figure 3, when the water temperature is lower than 26 ℃, the circulating water is used as cooling water, when the water temperature exceeds 26 ℃, the circulating water is switched to be fresh water as cooling water, and when the cooling water temperature is 23 ℃, the cooling water flow is 95m3And/h, increasing or decreasing the cooling water flow by 2% for every 1 ℃ increase or decrease of the cooling water.
The Al-Cu-Mg alloy oversized ingot prepared in the embodiment 1 of the invention has the size of 500 x 2000 mm.
The Al-Cu-Mg alloy ultra-large-specification ingot prepared in the embodiment 1 of the invention is subjected to component detection by using series of standards GB/T20975-2008 'chemical analysis method for aluminum and aluminum alloy', and the detection result is as follows: 0.06 wt% of Si, 0.17 wt% of Fe, 4.60 wt% of Cu, 0.61 wt% of Mn, 1.51 wt% of Mg, 0.03 wt% of Zn, 0.015 wt% of Ti and the balance of Al.
The Al-Cu-Mg alloy oversized ingot prepared in the embodiment 1 of the invention is subjected to low power detection, and the detection method is GB/T3246.2-2000 part 2 of the texture inspection method of wrought aluminum and aluminum alloy products: and the result of the macroscopic structure inspection method is qualified, and the yield of the Al-Cu-Mg alloy oversized ingot prepared by the method provided by the embodiment 1 of the invention is higher.
Example 2
Sequentially carrying out batching, smelting, component adjustment, melt purification, grain refinement, casting and saw cutting to obtain an Al-Cu-Mg alloy ultra-large specification ingot;
the mass content of Si is controlled to be less than or equal to 0.10 percent and the mass content of Fe is controlled to be less than or equal to 0.25 percent in the burdening process; 4.1-4.9% of Cu, 0.4-0.8% of Mn, 1.3-1.8% of Mg and no more than 0.15% of other elements.
The temperature of refining in the furnace in the smelting process is 720 ℃, and the time of refining in the furnace is 20 min; the refining gas of the online degassing refining is argon, the temperature of the online degassing refining is 720 ℃, and the temperature of the online filtering is 710 ℃.
The components are adjusted to be sampled and analyzed after the alloy raw materials are completely melted, the mass content of Si, Fe, Cu, Mn and Mg is adjusted to be within the range of the component content of the ingot alloy which is obtained in advance, and the mass content of Ti is adjusted to be 0.015%.
The melt purification is that nitrogen and chlorine in a furnace are refined for 25min, Ar gas is used on line, and the gas flow is 4.2m3/h。
In the grain refining process, an online grain refiner is added according to 1.2 kg/ton, and the grain refiner comprises 5.1% of Ti by mass, 1.0% of B by mass and the balance of Al.
The casting speed in the casting process is 45mm/min, the casting temperature is 720 ℃, the temperature at the tail end of the control flow plate is 700 ℃, the cooling water jacket used in the casting process is shown in figures 1 and 2, the crystallizer is an arc-shaped facet crystallizer shown in figure 3, when the water temperature is lower than 26 ℃, the circulating water is used as cooling water, when the water temperature exceeds 26 ℃, the circulating water is switched to be fresh water as cooling water, and when the cooling water temperature is 23 ℃, the cooling water flow is 95m3And/h, increasing or decreasing the cooling water flow by 2% for every 1 ℃ increase or decrease of the cooling water.
The Al-Cu-Mg alloy oversized ingot prepared in the embodiment 2 of the invention has the size of 500 x 2000 mm.
According to the method of the embodiment 1, the Al-Cu-Mg alloy oversized ingot prepared in the embodiment 2 of the invention is subjected to component detection, and the detection result is as follows: 0.05 wt% of Si, 0.19 wt% of Fe, 4.45 wt% of Cu, 0.58 wt% of Mn, 1.43 wt% of Mg, 0.07 wt% of Zn, 0.02 wt% of Ti and the balance of Al.
According to the method in the embodiment 1, the Al-Cu-Mg alloy oversized ingot prepared in the embodiment 2 is subjected to low power detection, the detection result is qualified, and the yield of the Al-Cu-Mg alloy oversized ingot prepared by the method in the embodiment 2 is high.
Example 3
Sequentially carrying out batching, smelting, component adjustment, melt purification, grain refinement, casting and saw cutting to obtain an Al-Cu-Mg alloy ultra-large specification ingot;
the mass content of Si is controlled to be less than or equal to 0.10 percent and the mass content of Fe is controlled to be less than or equal to 0.25 percent in the burdening process; 4.1-4.9% of Cu, 0.4-0.8% of Mn, 1.3-1.8% of Mg and no more than 0.15% of other elements.
The temperature of refining in the furnace in the smelting process is 730 ℃, and the time of refining in the furnace is 30 min; the refining gas of the online degassing refining is argon, the temperature of the online degassing refining is 725 ℃, and the temperature of the online filtering is 720 ℃.
The components are adjusted to be sampled and analyzed after the alloy raw materials are completely melted, the mass content of Si, Fe, Cu, Mn and Mg is adjusted to be within the range of the component content of the ingot alloy which is obtained in advance, and the mass content of Ti is adjusted to be 0.015%.
The melt purification is that the melt is refined by nitrogen and chlorine in a furnace for 20min, Ar gas is used on line, and the gas flow is 4.1m3/h。
In the grain refining process, an online grain refiner is added according to 1.2 kg/ton, and the grain refiner comprises 4.9 mass percent of Ti, 1.1 mass percent of B and the balance of Al.
In the casting processThe casting speed is 46mm/min, the casting temperature is 730 ℃, the temperature at the tail end of the control flow plate is 705 ℃, the cooling water jacket used in the casting process is shown in figures 1 and 2, the crystallizer is an arc-shaped facet crystallizer shown in figure 3, when the water temperature is lower than 26 ℃, circulating water is used as cooling water, when the water temperature is higher than 26 ℃, the circulating water is switched to fresh water as cooling water, and when the cooling water temperature is 23 ℃, the cooling water flow is 95m3And/h, increasing or decreasing the cooling water flow by 2% for every 1 ℃ increase or decrease of the cooling water.
The Al-Cu-Mg alloy oversized ingot prepared in the embodiment 3 of the invention has the size of 500 x 2000 mm.
According to the method of the embodiment 1, the Al-Cu-Mg alloy oversized ingot prepared in the embodiment 3 of the invention is subjected to component detection, and the detection result is as follows: 0.07 wt% of Si, 0.20 wt% of Fe, 4.65 wt% of Cu, 0.62 wt% of Mn, 1.62 wt% of Mg, 0.04 wt% of Zn, 0.02 wt% of Ti and the balance of Al.
According to the method in the embodiment 1, the Al-Cu-Mg alloy oversized ingot prepared in the embodiment 3 of the invention is subjected to low power detection, the detection result is qualified, and the yield of the Al-Cu-Mg alloy oversized ingot prepared by the method in the embodiment 3 of the invention is higher.
The embodiment shows that the invention provides a preparation method of an Al-Cu-Mg alloy oversized ingot, which comprises the following steps: sequentially carrying out material preparation, smelting, component adjustment, melt purification, grain refinement, casting and saw cutting; the temperature of cooling water in the casting process is 20-26 ℃, and the flow of the cooling water is 85-105 m3The casting speed is 44-46 mm/min. According to the invention, the temperature, the flow and the casting speed of the cooling water are accurately controlled, so that the prepared alloy is not easy to generate stress concentration, the cooling uniformity is good, the ingot cracking and the subcutaneous cracking are not easy to occur, and the yield is high.
Claims (9)
1. A preparation method of an Al-Cu-Mg alloy oversized ingot comprises the following steps:
sequentially carrying out material preparation, smelting, component adjustment, melt purification, grain refinement, casting and saw cutting;
the temperature of cooling water in the casting process is 20-26 ℃, and the flow of the cooling water is 85-105 m3H, the casting speed is 44-46 mm/min;
the crystallizer used in the casting process is an arc-shaped facet crystallizer;
the structure of the cooling water jacket adopted in the casting process comprises a water cavity, a pipeline communicated with an outlet of the water cavity, and a crystallizer mounting station communicated with an outlet of the pipeline; the water cavity is made of stainless steel, the pipeline is provided with a ball valve, and the pipeline is made of rubber.
2. The method according to claim 1, wherein the mass content of Si in the batching process is controlled to be less than or equal to 0.10 percent; the mass content of Fe is controlled to be less than or equal to 0.25 percent; the mass content of Cu is controlled to be 4.1-4.9%; the mass content of Mn is controlled to be 0.4-0.8%; the mass content of Mg is controlled to be 1.3-1.8%.
3. The method according to claim 1, wherein the smelting process comprises furnace refining, the temperature of the furnace refining is 710-730 ℃, and the time of the furnace refining is 15-30 min.
4. The method as claimed in claim 1, wherein the smelting process comprises online degassing refining, the online degassing refining gas is argon, the online degassing refining temperature is 710-725 ℃, and the online filtering temperature in the online degassing process is 700-720 ℃.
5. The method according to claim 1, wherein the composition adjustment process adjusts the mass content of Ti to 0.014 to 0.016%.
6. The method according to claim 1, wherein the amount of the grain refiner added during the grain refining process is 1.1 to 1.3 kg/ton.
7. The method according to claim 1, wherein the casting temperature during the casting process is 710 to 730 ℃.
8. The method of claim 1, wherein the ingot composition obtained after the casting is:
0-0.10 Wt% Si;
0-0.25 Wt% Fe;
4.3-4.7 Wt% of Cu;
0.5-0.7 Wt% Mn;
1.4-1.7 Wt% Mg;
0-0.15 Wt% Zn;
0-0.05 Wt% of Ti;
the balance being Al.
9. The method of claim 1, wherein the ingot size obtained after the casting is 480-520 mm thick by 1900-2100 mm wide.
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| CN114672678B (en) * | 2022-04-21 | 2023-08-22 | 西南铝业（集团）有限责任公司 | Preparation method of large round ingot of Al-Cu-Mg aluminum alloy |
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