CN113930648A - Preparation method of high-zinc-aluminum alloy flat ingot - Google Patents
Preparation method of high-zinc-aluminum alloy flat ingot Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- 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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- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a preparation method of a high-zinc aluminum alloy flat ingot, which relates to a preparation method of a high-zinc aluminum alloy flat ingot and aims to solve the problems of crack defects or stable crack defects and low yield of Al-Zn-Mg-Cu aluminum alloy flat ingots manufactured by the existing method. When the casting is carried out, the adjustable water baffle is adopted at the beginning, so that the cracks of the initial ingot casting can be reduced; the stable ingot casting cracks can be reduced by selecting reasonable stable process parameters. Solves the problem of low yield of the cast ingots prepared by the prior method, and ensures that the yield of the cast ingots reaches more than 90 percent. The invention is applied to the field of manufacturing of aluminum alloy flat ingots.
Description
Technical Field
The invention relates to a preparation method of a high-zinc-aluminum alloy flat ingot.
Background
The Al-Zn-Mg-Cu series superhard aluminum alloy has the characteristics of high strength, high toughness and good hardenability, is one of materials with better comprehensive performance in the conventional aluminum alloy, is suitable for producing thick plates, large-size extruded products, large free forgings and other processing products, particularly pre-stretched thick plates which are widely used in main body components of airplanes and are mainly used as parts of fuselage frames, wing spars, empennages and the like of the airplanes. However, the alloy has high alloying degree and large internal stress, and an ingot is not easy to form, so that part or the whole ingot is scrapped due to the initial crack defect or the steady-state crack defect in the prior production, in addition, the control of the melt purity is difficult, the flaw detection passing rate is low, the final ingot yield is only 42%, and the flaw detection passing rate is improved and the ingot crack waste products are reduced by controlling the alloy melt quality and the casting process parameters.
Disclosure of Invention
The invention provides a preparation method of a high-zinc aluminum alloy flat ingot, aiming at solving the problems of crack defects or stable crack defects and low yield of Al-Zn-Mg-Cu aluminum alloy flat ingots manufactured by the existing method.
The invention relates to a preparation method of a high-zinc-aluminum alloy flat ingot, which comprises the following steps:
firstly, weighing remelting aluminum ingot, metal Cu, metal Mg, metal Zn, Al-3Zr intermediate alloy, Al-6Ti intermediate alloy and Al-3Be intermediate alloy as smelting raw materials according to the mass percent of 2.0-2.6 percent of Cu, 1.9-2.6 percent of Mg, 5.7-6.7 percent of Zn, 0.08-0.15 percent of Zr, less than 0.06 percent of Ti and 0.015-0.04 percent of Be and the balance of Al; wherein the impurity elements Si is less than 0.12%, Fe is less than 0.15%, Mn is less than 0.10%, Cr is less than 0.04%, and Ni is less than 0.05%;
secondly, adding the smelting raw materials weighed in the step one into a natural gas melting furnace for melting, wherein the adding sequence of the smelting raw materials is as follows: firstly adding a remelting aluminum ingot, then adding an Al-3Zr intermediate alloy, adding metal Cu and metal Zn when the melt in the furnace is immersed in the metal Cu and the metal Zn, adding an Al-6Ti intermediate alloy after the metal in the furnace is completely melted, then adding an Al-3Be intermediate alloy and metal Mg, fully stirring the melt at 720-760 ℃, sampling and analyzing chemical components, and obtaining an aluminum alloy melt after the chemical components are qualified;
thirdly, introducing the aluminum alloy melt obtained in the second step into a natural gas heat preservation furnace at the temperature of 720-760 ℃, introducing argon and argon-chlorine mixed gas for refining, wherein the refining time is more than or equal to 40min, standing for 30-480min to obtain the refined aluminum alloy melt, enabling the refined aluminum alloy melt to flow into an online degassing device, then flowing into a filtering device, and then carrying out semi-continuous casting under the conditions that the casting temperature is 690-720 ℃ and Al-5Ti-1B wires are seeded on line to obtain the high-zinc-aluminum alloy flat ingot, wherein when the casting length is 0-99mm, the cooling water flow is 112 +/-5 m3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 315 mm; when the casting length is 100-3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 335 mm; when the casting length is 200-349mm, the cooling water flow is 80 +/-5 m3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 190 mm; when the casting length is 350-799mm, the cooling water flow is 80 +/-5 m3H, the casting speed is 40 +/-3 mm/min, and the position of a wiper is 190 mm; when the casting length is more than or equal to 800, the cooling water flow is 70m3/h～110m3The casting speed is 35 mm/min-55 mm/min, and the wiper position is 315 mm.
In actual production, the surface temperature distribution in the width direction of the ingot is not uniform, when the ingot is pulled out from a crystallizer, the surface layer of the ingot is contracted by the rapid cooling effect, but the water-meeting positions are not on the same horizontal line because of different temperatures of all points, so that the cooling speed is different, the contraction amount and the contraction speed are different, and the restriction effect is generated, so that larger additional tensile stress is formed at the position with higher water-meeting temperature, the generation of cracks is caused, and the additional tensile stress can be reduced by properly adjusting the steady-state process, so that the generation of the cracks is avoided. The wiper has the advantages that cooling water around the crystallizer is removed, the surface of the ingot is prevented from being in contact with the cooling water, namely the ingot at the position below the wiper is not in contact with the cooling water, when the casting starts, the ingot is continuously pulled out of the crystallizer and is in contact with the cooling water to generate casting stress, the casting stress can be reduced by using the wiper at a proper position, when the start reaches a certain length, the bottom of the ingot is warped, the casting stress is increased in the warping process, the casting stress can be reduced by adjusting the position of the wiper according to the warping condition, and accordingly the ingot crack tendency is reduced.
In addition, the total amount of gas introduced into the melt is increased by refining the mixed gas of argon and argon-chlorine, namely the number of bubbles in the melt is increased, and the more fully and uniformly the bubbles are contacted with the melt, the better refining effect is achieved, and the effects of improving the quality of the melt and the flaw detection yield are obvious.
The invention has the beneficial effects that:
the invention selects different adding time according to the characteristics of different alloy elements, thereby ensuring that each element is fully alloyed; the refining of the argon and argon-chlorine mixed gas can not only effectively reduce the alkali and alkaline earth metals such as Na, Ca, Li, K and the like in the melt, but also effectively improve the removal of impurities and H from the melt2The effect of (1); the H in the melt can be removed by using an online degassing device2(ii) a Impurities in the melt can be removed by using a filtering device; when casting, the adjustable water baffle is adopted at the beginning to reduce the cracks of the initial ingot; the stable ingot casting cracks can be reduced by selecting reasonable stable process parameters. The ingot yield obtained by the method can reach more than 90 percent, and the problem of the ingot yield prepared by the existing method is solvedLow problem.
Drawings
FIG. 1 is a photograph showing cracks in an initial ingot of an Al-Zn-Mg-Cu system super-hard aluminum alloy having a conventional specification of 520mm X1620 mm;
FIG. 2 is a photograph showing cracks in a stable ingot of an existing Al-Zn-Mg-Cu system, which has a specification of 520mm X1620 mm;
FIG. 3 shows a flat ingot of high zinc-aluminum alloy prepared in the first example.
Detailed Description
The first embodiment is as follows: the preparation method of the high-zinc-aluminum alloy flat ingot comprises the following steps:
firstly, weighing remelting aluminum ingot, metal Cu, metal Mg, metal Zn, Al-3Zr intermediate alloy, Al-6Ti intermediate alloy and Al-3Be intermediate alloy as smelting raw materials according to the mass percent of 2.0-2.6 percent of Cu, 1.9-2.6 percent of Mg, 5.7-6.7 percent of Zn, 0.08-0.15 percent of Zr, less than 0.06 percent of Ti and 0.015-0.04 percent of Be and the balance of Al; wherein the impurity elements Si is less than 0.12%, Fe is less than 0.15%, Mn is less than 0.10%, Cr is less than 0.04%, and Ni is less than 0.05%;
secondly, adding the smelting raw materials weighed in the step one into a natural gas melting furnace for melting, wherein the adding sequence of the smelting raw materials is as follows: firstly adding a remelting aluminum ingot, then adding an Al-3Zr intermediate alloy, adding metal Cu and metal Zn when the melt in the furnace is immersed in the metal Cu and the metal Zn, adding an Al-6Ti intermediate alloy after the metal in the furnace is completely melted, then adding an Al-3Be intermediate alloy and metal Mg, fully stirring the melt at 720-760 ℃, sampling and analyzing chemical components, and obtaining an aluminum alloy melt after the chemical components are qualified;
thirdly, introducing the aluminum alloy melt obtained in the second step into a natural gas heat preservation furnace at the temperature of 720-760 ℃, introducing argon and argon-chlorine mixed gas for refining, wherein the refining time is more than or equal to 40min, standing for 30-480min to obtain the refined aluminum alloy melt, enabling the refined aluminum alloy melt to flow into an online degassing device, then flowing into a filtering device, and then carrying out semi-continuous casting at the casting temperature of 690-720 ℃ under the condition of online seeding of Al-5Ti-1B wires to obtain the high-zinc-aluminum alloy flat ingot, wherein the casting length is longWhen the thickness is 0-99mm, the flow of cooling water is 112 +/-5 m3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 315 mm; when the casting length is 100-3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 335 mm; when the casting length is 200-349mm, the cooling water flow is 80 +/-5 m3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 190 mm; when the casting length is 350-799mm, the cooling water flow is 80 +/-5 m3H, the casting speed is 40 +/-3 mm/min, and the position of a wiper is 190 mm; when the casting length is more than or equal to 800, the cooling water flow is 70m3/h～110m3The casting speed is 35 mm/min-55 mm/min, and the wiper position is 315 mm.
In the first step of the present embodiment, Si, Fe, Mn, Cr, and Ni are impurity elements, and the lower the element content is, the better the actual production is. Adding metal Cu and metal Zn into the melt after the metal in the furnace is partially melted in the step two, wherein the partial melting means that the melted melt can dip the metal Cu and the metal Zn into the melt, and the metal Cu and the metal Zn can be added in any order; then adding Al-3Be master alloy and metal Mg in any order.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the high-zinc aluminum alloy flat cast ingot is prepared from the following components in percentage by mass, Si is less than 0.06%, Fe is less than 0.10%, Cu: 2.3%, Mn < 0.10%, Mg: 2.2%, Cr < 0.04%, Ni < 0.05%, Zn: 6.2%, Ti: 0.017%, Zr: 0.10%, Be: 0.02% and the balance of Al. Other steps and parameters are the same as those in the first embodiment.
In the present embodiment, Zr: 0.10 percent, trace element Zr can strongly improve the recrystallization temperature of the alloy, Zr can not only prevent crystal grains from growing up, but also improve the stress corrosion resistance of the alloy, when the Zr content is 0.1 to 0.2 percent, the alloy has high elongation and impact toughness, Zr and Al generate peritectic reaction to generate ZrAl3, not only alpha solid solution crystal grains can be refined, but also the Zr can play a role of solid solution strengthening, when the Zr content exceeds 0.17 percent, a coarse ZrAl3 primary crystal intermetallic compound is formed in a cast ingot, the compound has adverse effects on the plasticity of the alloy and other properties related to the alloy, and the Zr content is controlled to be 0.10 percent.
The third concrete implementation mode: in this embodiment, which differs from the first or second embodiment, all tool surfaces that come into contact with the melt are sprayed with a layer of boron nitride coating. Other steps and parameters are the same as those in the first or second embodiment.
In the embodiment, all tools in contact with the melt are iron tools, and in order to prevent Fe impurity elements of the aluminum melt from exceeding the standard requirement, a boron nitride coating needs to be sprayed on the surfaces of the tools.
The fourth concrete implementation mode: this embodiment is different from the first to third embodiments in that the covering flux is composed of 40% by mass of KCl and 45% by mass of MgCl28% of BaCl27% NaCl + CaCl2Composition, which is added in an amount of 1 kg/ton of melt. Other steps and parameters are the same as those in one of the first to third embodiments.
The fifth concrete implementation mode: the difference between the first embodiment and the fourth embodiment is that the purity of the remelted aluminum ingot in the first step is more than 99.90%, the metal Cu is electrolytic Cu, the metal Mg is pure Mg, the metal Zn is pure Zn, the Zr content in the Al-3Zr intermediate alloy is 3%, the rest is Al, the Ti content in the Al-6Ti intermediate alloy is 6%, the rest is Al, the Be content in the Al-3Be intermediate alloy is 3%, and the rest is Al. Other steps and parameters are the same as in one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between the first embodiment and the fifth embodiment is that the melt is stirred in the second step by electromagnetic stirring for 30-40 min. Other steps and parameters are the same as those in one of the first to fifth embodiments.
In the embodiment, the electromagnetic stirring mode is adopted for stirring, so that the chemical components of the melt are more uniform, and the melt can be prevented from being locally overheated.
The seventh embodiment: the difference between the first embodiment and the sixth embodiment is that in the third step, the argon and argon-chlorine mixed gas is refined, the argon purity is not less than 99.996%, and the gas flow is 13Nm3The argon-chlorine mixed gas is composed of 94% of argon and 6% of chlorine, and is introduced into the meltThe mixed gas rate of the medium argon and chlorine is 1.42L/min. Other steps and parameters are the same as those in one of the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is that the online degassing device in step three is a two-stage dual-rotor online degassing device, and the gas in the degassing device is argon gas with a purity of 99.996%. Other steps and parameters are the same as those in one of the first to seventh embodiments.
The specific implementation method nine: the present embodiment is different from the first to eighth embodiments in that the accuracy of the ceramic filter sheet in the filter device in the third step is 30ppi +50 ppi. Other steps and parameters are the same as those in one to eight of the embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is that the flow rate of cooling water is 80m when the casting length is greater than or equal to 800 in step three3The casting speed is 40 mm/min. Other steps and parameters are the same as those in one of the first to ninth embodiments. The ingot length of 800mm enters a steady state.
The concrete implementation mode eleven: the difference between this embodiment and the first to tenth embodiments is that the wire Al-5Ti-1B is seeded on-line in the third step, wherein the Ti content is 5% and the B content is 1%. Other steps and parameters are the same as in one of the first to tenth embodiments.
The specific implementation mode twelve: the difference between the present embodiment and one of the first to the eleventh embodiments is that the speed of online seeding Al-5Ti-1B filaments in the third step is 150 cm/min. Other steps and parameters are the same as those in one of the first to eleventh embodiments.
The beneficial effects of the invention are verified by the following tests:
the first embodiment is as follows:
a preparation method of a high zinc aluminum alloy flat ingot with the specification of 520mm multiplied by 1620mm multiplied by 4200mm is carried out according to the following steps:
firstly, the mass percentages of Si are less than 0.06%, Fe is less than 0.10%, and Cu: 2.3%, Mn less than 0.10%, Mg: 2.2%, Cr less than 0.04%, Ni less than 0.05%, Zn: 6.2%, Ti: 0.017%, Zr: 0.10%, Be: weighing the remelting aluminum ingot, the metal Cu, the metal Mg, the metal Zn, the Al-3Zr intermediate alloy, the Al-6Ti intermediate alloy and the Al-3Be intermediate alloy as smelting raw materials, wherein the remelting aluminum ingot accounts for 0.02 percent, and the balance is the remelting aluminum ingot;
secondly, adding the remelting aluminum ingot into the smelting raw material weighed in the first step, then adding Al-3Zr intermediate alloy, adding metal Cu and metal Zn into the melt after the metal in the furnace is partially melted, adding Al-6Ti intermediate alloy after the metal in the furnace is completely melted, then adding Al-3Be intermediate alloy and metal Mg, putting the mixture into a natural gas melting furnace in the sequence covered by a flux for melting, fully stirring the melt at 750 ℃, sampling and analyzing chemical components, and obtaining qualified aluminum alloy melt after the chemical components are qualified.
Thirdly, introducing the aluminum alloy melt obtained in the second step into a natural gas heat preservation furnace at the temperature of 750 ℃, introducing argon and argon-chlorine mixed gas for refining for 40min, standing for 30min to obtain a refined aluminum alloy melt, enabling the refined aluminum alloy melt obtained in the heat preservation furnace to flow into an online degassing device, then flowing into a filtering device, then passing through a casting head through a diverter plate, casting at the temperature of 720 ℃, and enabling the steady-state cooling water flow to be 80m3And h, the steady-state casting speed is 40mm/min, the position of a steady-state wiper is 315mm, and the melt is injected into a crystallizer under the condition of online seeding of Al-5Ti-1B wires for semi-continuous casting to obtain the high-zinc aluminum alloy flat ingot.
FIG. 1 shows a picture of initial ingot cracks of an Al-Zn-Mg-Cu type superhard aluminum alloy having a conventional specification of 520mm X1620 mm, and FIG. 2 shows a picture of steady-state ingot cracks. The high-zinc-aluminum alloy flat ingot (shown in fig. 3) prepared by the embodiment has qualified chemical components, no defects of cracks, cold shut, slag inclusion and the like on the surface, high flaw detection passing rate and 90% of final finished product rate.
Example two:
a method for preparing a high zinc-aluminum alloy flat ingot with the specification of 520mm multiplied by 1620mm multiplied by 7000mm is carried out according to the following steps:
firstly, the mass percentages of Si are less than 0.06%, Fe is less than 0.10%, and Cu: 2.3%, Mn less than 0.10%, Mg: 2.2%, Cr less than 0.04%, Ni less than 0.05%, Zn: 6.2%, Ti: 0.017%, Zr: 0.10%, Be: weighing the remelting aluminum ingot, the metal Cu, the metal Mg, the metal Zn, the Al-3Zr intermediate alloy, the Al-6Ti intermediate alloy and the Al-3Be intermediate alloy as smelting raw materials, wherein the remelting aluminum ingot accounts for 0.02 percent, and the balance is the remelting aluminum ingot;
secondly, adding the remelting aluminum ingot into the smelting raw material weighed in the first step, then adding Al-3Zr intermediate alloy, adding metal Cu and metal Zn into the melt after the metal in the furnace is partially melted, adding Al-6Ti intermediate alloy after the metal in the furnace is completely melted, then adding Al-3Be intermediate alloy and metal Mg, putting the mixture into a natural gas melting furnace in the sequence covered by a flux for melting, fully stirring the melt at 750 ℃, sampling and analyzing chemical components, and obtaining qualified aluminum alloy melt after the chemical components are qualified.
Thirdly, introducing the aluminum alloy melt obtained in the second step into a natural gas heat preservation furnace at the temperature of 750 ℃, introducing argon and argon-chlorine mixed gas for refining for 40min, standing for 30min to obtain a refined aluminum alloy melt, enabling the refined aluminum alloy melt obtained in the heat preservation furnace to flow into an online degassing device, then flowing into a filtering device, then passing through a casting head through a diverter plate, casting at the temperature of 720 ℃, and enabling the steady-state cooling water flow to be 100m3And h, the steady-state casting speed is 50mm/min, the position of a steady-state wiper is 315mm, and the melt is injected into a crystallizer under the condition of online seeding of Al-5Ti-1B wires for semi-continuous casting to obtain the high-zinc aluminum alloy flat ingot.
The high-zinc-aluminum alloy flat ingot obtained by the embodiment has qualified chemical components, no defects of cracks, cold shut, slag inclusion and the like on the surface, high flaw detection passing rate and the final yield up to 91%.
Claims (10)
1. A preparation method of a high-zinc aluminum alloy flat ingot is characterized by comprising the following steps:
firstly, weighing remelting aluminum ingot, metal Cu, metal Mg, metal Zn, Al-3Zr intermediate alloy, Al-6Ti intermediate alloy and Al-3Be intermediate alloy as smelting raw materials according to the mass percent of 2.0-2.6 percent of Cu, 1.9-2.6 percent of Mg, 5.7-6.7 percent of Zn, 0.08-0.15 percent of Zr, less than 0.06 percent of Ti and 0.015-0.04 percent of Be and the balance of Al; wherein the impurity elements Si is less than 0.12%, Fe is less than 0.15%, Mn is less than 0.10%, Cr is less than 0.04%, and Ni is less than 0.05%;
secondly, adding the smelting raw materials weighed in the step one into a natural gas melting furnace for melting, wherein the adding sequence of the smelting raw materials is as follows: firstly adding a remelting aluminum ingot, then adding an Al-3Zr intermediate alloy, adding metal Cu and metal Zn when the melt in the furnace is immersed in the metal Cu and the metal Zn, adding an Al-6Ti intermediate alloy after the metal in the furnace is completely melted, then adding an Al-3Be intermediate alloy and metal Mg, fully stirring the melt at 720-760 ℃, sampling and analyzing chemical components, and obtaining an aluminum alloy melt after the chemical components are qualified;
thirdly, introducing the aluminum alloy melt obtained in the second step into a natural gas heat preservation furnace at the temperature of 720-760 ℃, introducing argon and argon-chlorine mixed gas for refining, wherein the refining time is more than or equal to 40min, standing for 30-480min to obtain the refined aluminum alloy melt, enabling the refined aluminum alloy melt to flow into an online degassing device, then flowing into a filtering device, and then carrying out semi-continuous casting under the conditions that the casting temperature is 690-720 ℃ and Al-5Ti-1B wires are seeded on line to obtain the high-zinc-aluminum alloy flat ingot, wherein when the casting length is 0-99mm, the cooling water flow is 112 +/-5 m3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 315 mm; when the casting length is 100-3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 335 mm; when the casting length is 200-349mm, the cooling water flow is 80 +/-5 m3H, the casting speed is 45 +/-3 mm/min, and the position of a wiper is 190 mm; when the casting length is 350-799mm, the cooling water flow is 80 +/-5 m3H, the casting speed is 40 +/-3 mm/min, and the position of a wiper is 190 mm; when the casting length is more than or equal to 800, the cooling water flow is 70m3/h～110m3The casting speed is 35 mm/min-55 mm/min, and the wiper position is 315 mm.
2. The method for preparing the high-zinc-aluminum alloy flat ingot according to claim 1, wherein the high-zinc-aluminum alloy flat ingot is prepared from the following components in percentage by mass, Si < 0.06%, Fe < 0.10%, Cu: 2.3%, Mn < 0.10%, Mg: 2.2%, Cr < 0.04%, Ni < 0.05%, Zn: 6.2%, Ti: 0.017%, Zr: 0.10%, Be: 0.02% and the balance of Al.
3. The method of claim 1, wherein the flux for covering is selected from 40% KCl, 45% MgCl28% of BaCl27% NaCl + CaCl2Composition, which is added in an amount of 1 kg/ton of melt.
4. The preparation method of the high-zinc-aluminum alloy flat ingot according to claim 1, wherein the melt in the second step is stirred in an electromagnetic stirring mode for 30-40 min.
5. The preparation method of the high-zinc-aluminum alloy flat ingot according to claim 1, which is characterized in that the argon and argon-chlorine mixed gas in the third step is refined, the argon purity is more than or equal to 99.996%, and the gas flow is 13Nm3The argon-chlorine mixture gas composition was 94% argon + 6% chlorine, and the argon-chlorine mixture gas rate into the melt was 1.42L/min.
6. The method for preparing the high-zinc-aluminum alloy flat ingot according to claim 1, wherein the on-line degassing device in the third step is a two-stage double-rotor on-line degassing device, and the gas in the degassing device is argon with a purity of 99.996%.
7. The method for preparing the high-zinc-aluminum alloy flat ingot according to claim 1, wherein the precision of the ceramic filter sheet in the filtering device in the third step is 30ppi +50 ppi.
8. The method for preparing the high-zinc-aluminum alloy flat ingot according to claim 1, characterized in that the cooling water flow is 80m when the casting length is more than or equal to 800 in the third step3The casting speed is 40 mm/min.
9. The method for preparing the high-zinc-aluminum alloy flat ingot according to claim 1, wherein in the third step, Al-5Ti-1B wires are sowed on line, wherein the Ti content is 5%, and the B content is 1%.
10. The method for preparing the high-zinc-aluminum alloy flat ingot according to claim 1, wherein the speed of online seeding Al-5Ti-1B wires in the third step is 150 cm/min.
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| CN114427054A (en) * | 2022-01-20 | 2022-05-03 | 大连理工大学宁波研究院 | Aluminum alloy for high-speed train gear transmission system and manufacturing method thereof |
| CN115233008A (en) * | 2022-08-30 | 2022-10-25 | 西南铝业（集团）有限责任公司 | Ingot casting component control method and application |
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