CN118006975A - Large-diameter low-deformation-resistance aluminum alloy casting rod and preparation method thereof - Google Patents
Large-diameter low-deformation-resistance aluminum alloy casting rod and preparation method thereof Download PDFInfo
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
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- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims 2
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Abstract
The invention discloses a large-diameter low-deformation-resistance aluminum alloy casting rod and a preparation method thereof, wherein the aluminum alloy casting rod comprises the following components in percentage by mass ：Si 0.5-0.9％,Mg 0.4-0.7％,Mn 0.05-0.15％,Cr 0.05-0.15％,Ti 0.02-0.03％,B 0.004-0.006％,Cu 0-0.2％,Fe≤0.2％, and the balance of Al and unavoidable impurity elements. The preparation method sequentially comprises the steps of batching, melting aluminum alloy liquid, furnace refining, online grain refining, online degassing and filtering, semi-continuous casting and high-temperature homogenizing treatment. The invention can improve the cleanliness of the cast rod by optimizing the casting process of the aluminum alloy, and can eliminate the component segregation by melting coarse intermetallic compounds through double-stage high-temperature homogenization treatment, reduce the deformation resistance of the aluminum alloy cast rod and improve the extrusion speed and the production efficiency of the aluminum profile.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy preparation, and particularly relates to a large-diameter low-deformation-resistance aluminum alloy casting rod and a preparation method thereof.
Background
In recent years, with the rapid development of the photovoltaic power generation industry in China, the demand of photovoltaic aluminum profiles is increased in an explosive manner. According to statistics data of China non-ferrous metal processing industry association, 2022 China produces and sells 260 ten thousand tons of photovoltaic aluminum profiles. The photovoltaic aluminum profile mainly comprises a solar panel frame aluminum profile and a support aluminum profile, wherein the frame aluminum profile is used for fixing and sealing a solar module, and plays roles in protecting the edge of glass, enhancing the sealing performance of the photovoltaic module and improving the overall strength of the photovoltaic module. The support aluminum profile is a support structure designed for placing, installing and fixing the solar cell panel in the photovoltaic power generation system.
The Chinese patent application with publication number CN112375941A discloses a solar frame aluminum alloy section and a processing technology thereof, wherein the aluminum alloy section comprises the following components in percentage by mass: 0.55-0.66% of Si, 0.15-0.20% of Fe, 0.16-0.21% of Cu, 0.02-0.05% of Mn, 0.55-0.60% of Mg, 0.15-0.20% of Cr and the balance of aluminum. The tensile strength of the head part of the 6063 aluminum alloy section is 280MPa, the yield strength is 260MPa, the elongation is 12.7%, the tensile strength of the tail part is 265MPa, the yield strength is 249MPa, and the elongation is 11.1%. Another example is chinese patent application publication No. CN111996423a, which discloses an aluminum alloy section bar for solar photovoltaic frame and a preparation method thereof, wherein the aluminum alloy section bar comprises the following alloy elements in mass percent: 0.5-0.9% of Si, 0.4-0.8% of Mg, 0.15-0.25% of Fe, 0.015-0.025% of Ti, 0.08% of Cu, 0.08% of Mn, 0.10% of Zn, and the balance of Al, wherein the total amount is 100%, and the sum of the mass percentages of Cu and Mn is 0.08-0.16%. The tensile strength of the aluminum alloy section bar is 244-258MPa, the yield strength is 233-238MPa, the elongation is 12.5-13.9%, and the Webster hardness is 14.5-15.5. The strength of the aluminum alloy profile is still low. Further, as disclosed in chinese patent application publication No. CN113073239a, a solar photovoltaic frame support aluminum alloy material and a manufacturing method thereof, the aluminum alloy material comprises the following components in percentage by mass: si0.57-0.63%, mg 0.45-0.5%, mn 0.03-0.07%, cu 0-0.05%, cr 0-0.02%, fe 0-0.1%, zn 0-0.02%, ti 0.08-0.12%, the balance Al, the tensile strength of the aluminum alloy material is more than or equal to 270MPa, the yield strength is more than or equal to 250MPa, and the elongation is more than or equal to 10%. The Chinese patent application with publication number of CN114908274A discloses an aluminum alloy for a solar tracking photovoltaic bearing bracket and a section bar production process thereof, wherein the aluminum alloy material comprises the following components in percentage by mass: 0.7-0.9% of Si, less than or equal to 0.25% of Fe, less than or equal to 0.1% of Cu, 0.2-0.3% of Mn, 0.5-0.7% of Mg, 0.1-0.2% of Zn, less than or equal to 0.01% of Cr, 0.05-0.1% of Ti, less than or equal to 0.15% of other impurities, and the balance of aluminum, wherein the tensile strength of the aluminum alloy profile is 291MPa, the yield strength is 271MPa, and the elongation after fracture is 10.5%.
In the prior art, the requirements of the solar photovoltaic industry on photovoltaic aluminum profiles are higher and higher, on one hand, the thickness of the aluminum profiles is required to be thinner and thinner so as to lower the weight and the manufacturing cost of solar photovoltaic modules, and on the other hand, the strength of aluminum alloy is required to be higher and higher so as to meet the development of lightening and thinning of the photovoltaic aluminum profiles and improve the strength and the service life of photovoltaic power generation devices. The improvement of the strength of the aluminum alloy and the thinning of the wall thickness of the profile can lead to the reduction of the extrusion speed of the aluminum profile, and the extrusion production efficiency of the photovoltaic aluminum profile is reduced. Therefore, the method for reducing the deformation resistance of the large-diameter aluminum alloy casting rod is researched and developed to improve the extrusion speed and the production efficiency of the photovoltaic aluminum profile, and the method has great significance in meeting the great demand of the photovoltaic industry on the photovoltaic aluminum profile.
Disclosure of Invention
The invention aims to solve the problems and the shortcomings, and provides a large-diameter low-deformation-resistance aluminum alloy casting rod and a preparation method thereof.
The technical scheme of the invention is realized as follows:
The invention provides a large-diameter low-deformation-resistance aluminum alloy casting rod, which comprises the following components in percentage by mass: 0.5 to 0.9 percent of Si, 0.4 to 0.7 percent of Mg, 0.05 to 0.15 percent of Mn, 0.05 to 0.15 percent of Cr, 0.02 to 0.03 percent of Ti, 0.004 to 0.006 percent of B, 0 to 0.2 percent of Cu, less than or equal to 0.2 percent of Fe, the balance of Al and unavoidable impurity elements, the single content of the unavoidable impurity elements is less than or equal to 0.05 percent, and the total content of the impurity elements is less than or equal to 0.15 percent.
Si and Mg are main strengthening elements of the aluminum alloy casting rod, and besides the solid solution strengthening effect of the Si and the Mg in the aluminum alloy casting rod, the strength of the photovoltaic aluminum profile can be obviously improved by precipitating Mg 2 Si strengthening phases through aging. Too low content of Si and Mg can lead to the strength of the photovoltaic aluminum profile meeting the requirements of non-photovoltaic industry, and the higher the content of Si and Mg, the higher the strength of the photovoltaic aluminum profile, but also can lead to the difficulty in extrusion of the aluminum alloy casting rod. Preferably, the Si content is 0.5-0.9% and the Mg content is 0.4-0.7%.
Mn and Cr can improve the strength of the photovoltaic aluminum profile in the aluminum alloy, and can improve the recrystallization temperature of the aluminum alloy casting rod by inhibiting recrystallization, thereby being beneficial to improving the heating and extrusion temperature of the aluminum alloy casting rod and improving the extrusion speed and production efficiency of the photovoltaic aluminum profile. The higher the Mn and Cr contents, the higher the recrystallization temperature of the aluminum alloy cast rod, but at the same time, the deformation resistance of the aluminum alloy cast rod is increased, and therefore, the Mn and Cr contents cannot be too high nor too low. Preferably, the Mn content is 0.05-0.15%, and the Cr content is 0.05-0.15%.
Ti and B are added into the aluminum alloy casting rod in the form of aluminum titanium boron alloy rods, and the main function is to refine grains of the aluminum alloy casting rod, improve uniformity of components of the aluminum alloy casting rod and improve extrusion performance of the aluminum alloy casting rod. The lower the content of Ti and B, the less ideal the grain refining effect, the higher the content of Ti and B, the finer the grains, but the higher the production cost. Preferably, the Ti content is 0.02-0.03% and the B content is 0.004-0.006%.
Cu has very strong strengthening effect in aluminum alloy, can improve the strength of photovoltaic aluminum profile through solid solution strengthening, and can improve the strength of photovoltaic aluminum profile through aging precipitation CuAl 2 phase. The higher the Cu content is, the higher the strength of the photovoltaic aluminum profile is, but the higher the Cu content is, the deformation resistance of the aluminum alloy casting rod is increased, and the photovoltaic aluminum profile is difficult to extrude. Therefore, the addition of Cu requires caution, and if the strength requirement for the photovoltaic aluminum profile is high, a proper amount of Cu may be added, and if the strength requirement is not particularly high, it is recommended that no Cu be added.
Fe is an inevitable impurity element in aluminum alloys. Fe can form coarse needle-shaped and flaky Fe-rich phases in the aluminum alloy, so that the extrusion difficulty of the aluminum alloy casting rod can be increased, an aluminum matrix can be split, a crack source and a crack propagation direction of the photovoltaic aluminum profile are formed, and the strength and the plasticity of the photovoltaic aluminum profile are seriously damaged. Therefore, in order to improve the extrusion performance of the aluminum alloy cast rod, it is necessary to strictly control the content of Fe. Preferably, the content of Fe is 0.2% or less.
The second aspect of the invention provides a method for preparing a large-diameter low-deformation-resistance aluminum alloy casting rod, which comprises the following steps:
(1) According to the component composition and mass percentage of the aluminum alloy casting rod, selecting aluminum ingots, magnesium ingots, aluminum silicon alloy, aluminum manganese alloy, aluminum chromium alloy, aluminum copper alloy and aluminum titanium boron alloy rods as raw materials for proportioning;
(2) Adding an aluminum ingot, a magnesium ingot, aluminum-silicon alloy, aluminum-manganese alloy, aluminum-chromium alloy and aluminum-copper alloy into an aluminum melting furnace, and heating and melting the aluminum ingot, the magnesium ingot, the aluminum-silicon alloy, the aluminum-manganese alloy and the aluminum-copper alloy into aluminum alloy liquid at 740-760 ℃;
(3) Adopting argon and a refining agent to carry out slag removal treatment on aluminum alloy liquid in a furnace by blowing refining, and then removing scum on the surface of the aluminum alloy liquid;
(4) Introducing mixed gas consisting of argon and chlorine into the aluminum alloy liquid in the furnace through an air brick arranged at the bottom of the furnace for degassing treatment;
(5) Introducing the aluminum alloy liquid into a flow tank, and then adding an aluminum titanium boron alloy rod accounting for 0.4-0.6% of the total weight of the raw materials to carry out online grain refinement treatment;
(6) The aluminum alloy liquid sequentially flows through a degassing box and a tubular filter box which are arranged on a launder to carry out on-line degassing and filtering treatment;
(7) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy casting rod under the conditions that the temperature of the aluminum alloy liquid is 680-720 ℃, the casting speed is 100-200 mm/min and the temperature of cooling water is 20-40 ℃;
(8) Heating the aluminum alloy casting rod at 635+/-5 ℃ of a hearth for 1-1.5 hours, then reducing the hearth temperature to 590+/-5 ℃ and continuously heating for 3-4 hours for homogenizing treatment, and then spraying water mist to cool to room temperature to obtain the aluminum alloy casting rod.
Preferably, in the step (1), the aluminum content of the aluminum ingot is more than or equal to 99.7%, the magnesium content of the magnesium ingot is more than or equal to 99.8%, the silicon content of the aluminum-silicon alloy is 25%, the manganese content of the aluminum-manganese alloy is 15%, the chromium content of the aluminum-chromium alloy is 20%, the copper content of the aluminum-copper alloy is 20%, the titanium content of the aluminum-titanium-boron alloy rod is 5%, and the boron content is 1%.
Preferably, the purity of the argon in the step (3) is more than or equal to 99.99 percent, the consumption of the refining agent is 0.1 to 0.2 percent of the weight of the aluminum alloy liquid, the blowing refining time is 15 to 25 minutes, and the refining agent consists of the following components in percentage by mass ：ZnCl2 42-45％,K2CO3 24-26％,NaNO3 8-9％,KF 10-11％,K2SO4 7-8％,Li2SO4 4-5％.
Preferably, the refining agent in the step (3) is composed of the following components in percentage by mass ：ZnCl243.67％,K2CO3 25.64％,NaNO3 8.36％,KF 10.78％,K2SO4 7.26％,Li2SO4 4.29％.
Preferably, the preparation method of the refining agent sequentially comprises the following steps: (1) ZnCl 2、K2CO3、NaNO3、KF、K2SO4、Li2SO4 with the purity more than or equal to 99.8 percent is selected as a raw material for batching; (2) Heating and melting raw materials at 1150 ℃ under the protection of argon with purity more than or equal to 99.99%, and then cooling and solidifying the block refining agent; (3) And (3) crushing the block refining agent into powder with the particle size less than or equal to 2 mm to obtain the refining agent.
The air holes and inclusions not only reduce the strength of the aluminum alloy, but also increase the deformation resistance of the aluminum alloy casting rod, resulting in difficult extrusion. The traditional refining agent is mainly prepared by directly crushing and mixing raw materials such as sodium salt, fluoride salt, chloride salt, hexachloroethane and the like, and does not exert interaction among the raw materials, so that the melting point of the refining agent is high, and the deslagging efficiency is low. In order to improve the purity of the aluminum alloy casting rod and reduce the deformation resistance of the aluminum alloy casting rod, the inventor develops a high-efficiency and environment-friendly refining agent through a large amount of experimental researches, the refining agent takes ZnCl 2 as a main component and is matched with a small amount of K 2CO3、NaNO3、KF、K2SO4、Li2SO4, wherein the mass ratio of K 2CO3 to KF is 2.38, the mass ratio of K 2SO4 to Li 2SO4 is 1.69, in order to prevent oxidation and volatilization of raw materials in a high-temperature heating process, the raw materials are firstly heated and melted at 1100-1200 ℃ under the protection of argon, then cooled, solidified and crushed into a powdery refining agent, the melting point of ZnCl 2 is about 290 ℃, and the melting point of NaNO 3 is 306.8 ℃, the melting point of K 2CO3 is 891 ℃, the melting point of KF is 858 ℃, the melting point of K 2SO4 is 1069 ℃, the melting point of Li 2SO4 is 859 ℃, and although the melting point of K 2CO3、KF、K2SO4、Li2SO4 is higher, KF 2CO3 and KF form KF.K 2CO3 eutectic with the melting point of only 688 ℃, K 2SO4 and Li 2SO4 form K 2SO4·Li2SO4 eutectic with the melting point of only 716 ℃, the melting point of the refining agent is greatly reduced, the refining agent is easier to melt in the aluminum alloy liquid, znCl 2 is decomposed into Cl 2,K2CO3, CO 2,NaNO3 is decomposed into N 2、CO2 and NO gas, and a large number of bubbles capture impurities in the aluminum alloy liquid in the floating process, thereby playing a slag removal effect. The K 2SO4·Li2SO4 eutectic is melted into liquid molten salt, has good wetting spheroidization effect on inclusions such as alumina, promotes the separation of the inclusions and aluminum liquid, and improves the deslagging efficiency. In addition, the refining agent does not contain sodium salt and hexachloroethane, only contains a small amount of fluoride salt, and is more environment-friendly to use.
Preferably, in the step (4), the purity of the argon is more than or equal to 99.99%, the purity of the chlorine is more than or equal to 99.9%, the volume percentage of the chlorine in the mixed gas is 3-5%, the flow rate of the mixed gas is 0.3-0.6 cubic meter/min, and the degassing time is 10-20 minutes.
The degassing of the furnace bottom air brick is to install a plurality of porous air bricks at the bottom of an aluminum melting furnace, then to introduce mixed gas composed of argon and chlorine into the aluminum alloy liquid in the furnace through the air bricks, the mixed gas is decomposed into tiny and uniform small bubbles after passing through the porous air bricks, the small bubbles capture hydrogen in the aluminum alloy liquid in the floating process, and then the aluminum alloy liquid is brought out by floating up, thereby playing a degassing role. Because the bottom of the aluminum melting furnace is uniformly provided with a plurality of porous air bricks, bubbles are uniformly distributed in the aluminum alloy liquid, and meanwhile, the bubbles have stirring effect on the aluminum alloy liquid when floating up, so that the dead angle of degassing of the aluminum alloy liquid in the furnace is avoided, and the degassing efficiency of the aluminum alloy liquid is improved. The greater the flow rate of the mixed gas, the longer the aeration time, and the better the degassing effect. Preferably, the flow rate of the mixed gas is 0.3-0.6 cubic meter/min, the degassing time is 10-20 min, the hydrogen content of the aluminum alloy liquid in the furnace can be reduced to be less than 0.2ml/100gAl, and the purity of the aluminum alloy liquid in the furnace can be greatly improved.
Preferably, in the step (6), the rotating speed of the graphite rotor in the degassing tank is 400-500 r/min, the gas flow rate on the graphite rotor is 2-3 cubic meters/h, the gas pressure is 0.4-0.6MPa, the gas is a mixed gas composed of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9%, and the volume percentage of the chlorine in the mixed gas is 5-10%.
The mixed gas composed of argon and chlorine is crushed into tiny bubbles by a graphite rotor rotating at high speed in a degassing box and enters the aluminum alloy liquid, hydrogen atoms in the aluminum alloy liquid are continuously diffused into the bubbles by utilizing partial pressure difference of hydrogen between the aluminum alloy liquid and the bubbles, then float upwards along with the bubbles to escape from the aluminum alloy liquid, degassing is achieved, and after degassing by the degassing box, the hydrogen content of the aluminum alloy liquid can be reduced to below 0.08ml/100 gAl.
The filtering medium of the tubular filter box in the step (6) is a ceramic filter tube, the ceramic filter tube is formed by sintering silicon nitride ceramic particles with the particle size of 3-6mm and a binder at high temperature, a large number of tortuous pores are formed in the ceramic filter tube, and when aluminum alloy liquid flows through the ceramic filter tube, impurities are adsorbed or blocked on the surface of the ceramic filter tube and the inner walls of the pores, so that the filtering and impurity removing effects are achieved. The ceramic filter tube has high thermal strength, strong thermal shock resistance and thermal erosion resistance, large filtering quantity and high filtering efficiency. The structure and the use method of the tubular filter box can be checked by published literature data, and are not repeated here. The tubular filtration belongs to high-precision filtration, the removal rate of inclusions of more than 5 mu m in the aluminum alloy liquid after tubular filtration can reach more than 98%, and the slag content in the aluminum alloy can be reduced to 0.05mm 2/kgAl, so that the cleanliness of the aluminum alloy casting rod is greatly improved, and the deformation resistance of the aluminum alloy casting rod is reduced.
In the step (8), the aluminum alloy casting rod is subjected to homogenization treatment, so that macro-micro segregation of elements in the aluminum alloy casting rod is eliminated, coarse intermetallic compounds are melted, internal stress of the casting rod is eliminated, deformation resistance of the aluminum alloy casting rod is reduced, and extrusion speed is improved. In the prior art, an isothermal heating mode is generally adopted to carry out homogenization treatment on an aluminum alloy casting rod, and the inventor finds that the isothermal heating homogenization mode leads the temperature rising speed of the aluminum alloy casting rod to be low, and particularly for large-size aluminum alloy casting rods, the temperature of the aluminum alloy casting rod does not reach the temperature set by a hearth in most of time although the heating time is longer, so that the homogenization effect of the aluminum alloy casting rod is seriously affected. The inventor further researches a lot of experiments to find that the aluminum alloy casting rod is firstly heated for 1-1.5 hours at 635+/-5 ℃ of the hearth, then the hearth temperature is reduced to 590+/-5 ℃ and is continuously heated for 3-4 hours, the temperature of the aluminum alloy casting rod is quickly increased to 590+/-5 ℃ by firstly heating at high temperature, and then the aluminum alloy casting rod is continuously heated for 3-4 hours at 590+/-5 ℃, so that the heating time is greatly shortened, the energy consumption is reduced, the production cost is reduced, the homogenizing effect of the aluminum alloy casting rod is better than that of the traditional isothermal heating mode, the deformation resistance of the aluminum alloy casting rod is greatly reduced, and the extrusion speed is improved.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the composition of the aluminum alloy is scientifically designed, the preparation process of the large-diameter aluminum alloy casting rod is optimized, the cleanliness of aluminum alloy liquid is improved, the tissue components of the aluminum alloy casting rod are refined and homogenized, coarse intermetallic compounds are eliminated by melting, the deformation resistance of the large-diameter aluminum alloy round rod is reduced, and the extrusion speed and extrusion production efficiency of the aluminum alloy casting rod are greatly improved. In addition, the refining agent developed by the invention has the advantages of low melting point and high deslagging efficiency, does not contain hexachloroethane, only contains a small amount of fluoride salt, reduces the emission of irritating and unpleasant smog during refining, is more environment-friendly in use, and is beneficial to protecting the environment and the health of staff.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solution of the present invention will be further described with reference to the specific embodiments, but the present invention is not limited thereto, and other variations of the disclosed embodiments, as will be apparent to those skilled in the art, should fall within the scope of the present invention as defined in the claims.
Example 1:
large diameter low deformation resistance aluminium alloy cast rod:
the aluminum alloy casting rod with the diameter of 203 mm comprises the following components in percentage by mass: si 0.68%, mg0.53%, mn 0.11%, cr 0.09%, ti 0.025%, B0.005%, fe less than or equal to 0.2%, the balance being Al and unavoidable impurity elements, the individual content of the unavoidable impurity elements being less than or equal to 0.05%, the total amount of the impurity elements being less than or equal to 0.15%.
A method for preparing a large-diameter low-deformation-resistance aluminum alloy casting rod, which sequentially comprises the following steps:
(1) According to the component composition and mass percentage of the aluminum alloy casting rod, selecting an aluminum ingot with the aluminum content more than or equal to 99.7%, a magnesium ingot with the magnesium content more than or equal to 99.8%, an aluminum-silicon alloy with the silicon content of 25%, an aluminum-manganese alloy with the manganese content of 15%, an aluminum-chromium alloy with the chromium content of 20%, an aluminum-titanium-boron alloy rod with the titanium content of 5% and the boron content of 1% as raw materials for proportioning;
(2) Adding an aluminum ingot, a magnesium ingot, aluminum-silicon alloy, aluminum-manganese alloy and aluminum-chromium alloy into an aluminum melting furnace, and heating and melting the aluminum ingot, the magnesium ingot, the aluminum-silicon alloy and the aluminum-manganese alloy into aluminum alloy liquid at 750 ℃;
(3) Adopting argon with purity more than or equal to 99.99% and refining agent with weight of 0.15% of the aluminum alloy liquid to carry out slag removal treatment on the aluminum alloy liquid in the furnace by blowing and refining for 20 minutes, and then removing scum on the surface of the aluminum alloy liquid;
(4) Introducing mixed gas consisting of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9% into aluminum alloy liquid in the furnace through an air brick arranged at the bottom of the furnace for degassing treatment, wherein the volume percentage of the chlorine in the mixed gas is 4%, the flow rate of the mixed gas is 0.5 cubic meter/min, and the degassing time is 15 min;
(5) Introducing the aluminum alloy liquid into a flow tank, and then adding an aluminum titanium boron alloy rod accounting for 0.5 percent of the total weight of the raw materials to carry out online grain refinement treatment;
(6) The aluminum alloy liquid sequentially flows through a degassing tank and a tubular filter tank which are arranged on a launder for online degassing and filtering treatment, the rotating speed of a graphite rotor in the degassing tank is 450 revolutions per minute, the gas flow rate on the graphite rotor is 2.5 cubic meters per hour, the gas pressure is 0.5MPa, the gas is a mixed gas composed of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9%, and the volume percentage of the chlorine in the mixed gas is 8%;
(7) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy casting rod with the diameter of 203 mm under the conditions that the temperature of the aluminum alloy liquid is 700 ℃, the casting speed is 150 mm/min and the temperature of cooling water is 30 ℃;
(8) Heating the aluminum alloy casting rod at the furnace temperature of 635 ℃ for 1 hour, then reducing the furnace temperature to 590 ℃ and continuously heating for 3.5 hours for homogenizing treatment, and then spraying water mist to cool to room temperature to obtain the aluminum alloy casting rod with the diameter of 203 mm.
Wherein, the refining agent in the step (3) comprises the following components in percentage by mass ：ZnCl243.67％,K2CO325.64％,NaNO3 8.36％,KF 10.78％,K2SO4 7.26％,Li2SO44.29％,, and the preparation method of the refining agent sequentially comprises the following steps: (1) ZnCl 2、K2CO3、NaNO3、KF、K2SO4、Li2SO4 with the purity more than or equal to 99.8 percent is selected as a raw material for batching; (2) Heating and melting raw materials at 1150 ℃ under the protection of argon with purity more than or equal to 99.99%, and then cooling and solidifying the block refining agent; (3) And (3) crushing the block refining agent into powder with the particle size less than or equal to 2 mm to obtain the refining agent.
Example 2:
large diameter low deformation resistance aluminium alloy cast rod:
The 292 mm diameter aluminum alloy casting rod consists of the following components in percentage by mass: si 0.9%, mg0.4%, mn 0.05%, cr 0.15%, ti 0.02%, B0.004%, fe less than or equal to 0.2%, the balance being Al and unavoidable impurity elements, the individual content of the unavoidable impurity elements being less than or equal to 0.05%, the total content of the impurity elements being less than or equal to 0.15%.
A method for preparing a large-diameter low-deformation-resistance aluminum alloy casting rod, which sequentially comprises the following steps:
(1) According to the component composition and mass percentage of the aluminum alloy casting rod, selecting an aluminum ingot with the aluminum content more than or equal to 99.7%, a magnesium ingot with the magnesium content more than or equal to 99.8%, an aluminum-silicon alloy with the silicon content of 25%, an aluminum-manganese alloy with the manganese content of 15%, an aluminum-chromium alloy with the chromium content of 20%, an aluminum-titanium-boron alloy rod with the titanium content of 5% and the boron content of 1% as raw materials for proportioning;
(2) Adding an aluminum ingot, a magnesium ingot, aluminum-silicon alloy, aluminum-manganese alloy, aluminum-chromium alloy and aluminum-copper alloy into an aluminum melting furnace, and heating and melting the aluminum ingot, the magnesium ingot, the aluminum-silicon alloy, the aluminum-manganese alloy and the aluminum-copper alloy into aluminum alloy liquid at 740 ℃;
(3) Adopting argon with purity more than or equal to 99.99% and refining agent with weight of 0.1% of the aluminum alloy liquid to carry out slag removal treatment on the aluminum alloy liquid in the furnace by blowing and refining for 15 minutes, and then removing scum on the surface of the aluminum alloy liquid;
(4) Introducing mixed gas consisting of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9% into aluminum alloy liquid in the furnace through an air brick arranged at the bottom of the furnace for degassing treatment, wherein the volume percentage of the chlorine in the mixed gas is 5%, the flow rate of the mixed gas is 0.6 cubic meter/min, and the degassing time is 20 minutes;
(5) Introducing the aluminum alloy liquid into a flow tank, and then adding an aluminum titanium boron alloy rod accounting for 0.4 percent of the total weight of the raw materials to carry out online grain refinement treatment;
(6) The aluminum alloy liquid sequentially flows through a degassing tank and a tubular filter tank which are arranged on a launder for online degassing and filtering treatment, the rotating speed of a graphite rotor in the degassing tank is 500 revolutions per minute, the gas flow rate on the graphite rotor is 2 cubic meters per hour, the gas pressure is 0.4MPa, the gas is mixed gas composed of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9%, and the volume percentage of the chlorine in the mixed gas is 5%;
(7) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy casting rod with the diameter of 292 mm under the conditions that the temperature of the aluminum alloy liquid is 720 ℃, the casting speed is 100 mm/min and the temperature of cooling water is 20 ℃;
(8) Heating the aluminum alloy casting rod at the temperature of 640 ℃ of a hearth for 1 hour, then reducing the temperature of the hearth to 595 ℃ and continuously heating for 3 hours to carry out homogenization treatment, and then spraying water mist to cool to room temperature to obtain the 292 mm-diameter aluminum alloy casting rod.
Wherein, the refining agent in the step (3) comprises the following components in percentage by mass ：ZnCl243.44％,K2CO324.82％,NaNO3 8.72％,KF 10.43％,K2SO4 7.91％,Li2SO44.68％,, and the preparation method of the refining agent sequentially comprises the following steps: (1) ZnCl 2、K2CO3、NaNO3、KF、K2SO4、Li2SO4 with the purity more than or equal to 99.8 percent is selected as a raw material for batching; (2) Heating and melting raw materials at 1150 ℃ under the protection of argon with purity more than or equal to 99.99%, and then cooling and solidifying the block refining agent; (3) And (3) crushing the block refining agent into powder with the particle size less than or equal to 2 mm to obtain the refining agent.
Example 3:
large diameter low deformation resistance aluminium alloy cast rod:
the 380 mm diameter aluminum alloy casting rod consists of the following components in percentage by mass: si 0.5%, mg0.7%, mn 0.15%, cr 0.05%, ti 0.03%, B0.006%, cu 0.11%, fe less than or equal to 0.2%, the balance being Al and unavoidable impurity elements, the individual content of the unavoidable impurity elements being less than or equal to 0.05%, the total amount of the impurity elements being less than or equal to 0.15%.
A method for preparing a large-diameter low-deformation-resistance aluminum alloy casting rod, which sequentially comprises the following steps:
(1) According to the component composition and mass percentage of the aluminum alloy casting rod, selecting an aluminum ingot with the aluminum content more than or equal to 99.7%, a magnesium ingot with the magnesium content more than or equal to 99.8%, an aluminum-silicon alloy with the silicon content of 25%, an aluminum-manganese alloy with the manganese content of 15%, an aluminum-chromium alloy with the chromium content of 20%, an aluminum-copper alloy with the copper content of 20%, an aluminum-titanium-boron alloy rod with the titanium content of 5% and the boron content of 1% as raw materials for proportioning;
(2) Adding an aluminum ingot, a magnesium ingot, aluminum-silicon alloy, aluminum-manganese alloy, aluminum-chromium alloy and aluminum-copper alloy into an aluminum melting furnace, and heating and melting the aluminum ingot, the magnesium ingot, the aluminum-silicon alloy, the aluminum-manganese alloy and the aluminum-copper alloy into aluminum alloy liquid at 760 ℃;
(3) Adopting argon with purity more than or equal to 99.99% and refining agent with weight of 0.2% of the aluminum alloy liquid to carry out slag removal treatment on the aluminum alloy liquid in the furnace by blowing and refining for 25 minutes, and then removing scum on the surface of the aluminum alloy liquid;
(4) Introducing mixed gas consisting of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9% into aluminum alloy liquid in the furnace through an air brick arranged at the bottom of the furnace for degassing treatment, wherein the volume percentage of the chlorine in the mixed gas is 3%, the flow rate of the mixed gas is 0.3 cubic meter/min, and the degassing time is 10 minutes;
(5) Introducing the aluminum alloy liquid into a flow tank, and then adding an aluminum titanium boron alloy rod accounting for 0.6 percent of the total weight of the raw materials to carry out online grain refinement treatment;
(6) The aluminum alloy liquid sequentially flows through a degassing tank and a tubular filter tank which are arranged on a launder for online degassing and filtering treatment, the rotating speed of a graphite rotor in the degassing tank is 400 revolutions per minute, the gas flow rate on the graphite rotor is 3 cubic meters per hour, the gas pressure is 0.6MPa, the gas is mixed gas composed of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9%, and the volume percentage of the chlorine in the mixed gas is 10%;
(7) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy casting rod with the diameter of 380 mm under the conditions that the temperature of the aluminum alloy liquid is 680 ℃, the casting speed is 200 mm/min and the temperature of cooling water is 40 ℃;
(8) Heating the aluminum alloy casting rod at the temperature of 630 ℃ of a hearth for 1.5 hours, then reducing the temperature of the hearth to 585 ℃ and continuously heating for 4 hours to carry out homogenization treatment, and then spraying water mist to cool to room temperature to obtain the aluminum alloy casting rod with the diameter of 380 mm.
Wherein, the refining agent in the step (3) comprises the following components in percentage by mass ：ZnCl242.38％,K2CO325.97％,NaNO3 8.02％,KF 10.92％,K2SO4 7.99％,Li2SO44.72％,, and the preparation method of the refining agent sequentially comprises the following steps: (1) ZnCl 2、K2CO3、NaNO3、KF、K2SO4、Li2SO4 with the purity more than or equal to 99.8 percent is selected as a raw material for batching; (2) Heating and melting raw materials at 1150 ℃ under the protection of argon with purity more than or equal to 99.99%, and then cooling and solidifying the block refining agent; (3) And (3) crushing the block refining agent into powder with the particle size less than or equal to 2 mm to obtain the refining agent.
Example 4:
large diameter low deformation resistance aluminium alloy cast rod:
The aluminum alloy casting rod with the diameter of 430 mm comprises the following components in percentage by mass: si 0.72%, mg0.54%, mn 0.08%, cr 0.11%, ti 0.025%, B0.005%, cu 0.09%, fe less than or equal to 0.2%, the balance being Al and unavoidable impurity elements, the individual content of the unavoidable impurity elements being less than or equal to 0.05%, the total amount of the impurity elements being less than or equal to 0.15%.
A method for preparing a large-diameter low-deformation-resistance aluminum alloy casting rod, which sequentially comprises the following steps:
(1) According to the component composition and mass percentage of the aluminum alloy casting rod, selecting an aluminum ingot with the aluminum content more than or equal to 99.7%, a magnesium ingot with the magnesium content more than or equal to 99.8%, an aluminum-silicon alloy with the silicon content of 25%, an aluminum-manganese alloy with the manganese content of 15%, an aluminum-chromium alloy with the chromium content of 20%, an aluminum-copper alloy with the copper content of 20%, an aluminum-titanium-boron alloy rod with the titanium content of 5% and the boron content of 1% as raw materials for proportioning;
(2) Adding an aluminum ingot, a magnesium ingot, aluminum-silicon alloy, aluminum-manganese alloy, aluminum-chromium alloy and aluminum-copper alloy into an aluminum melting furnace, and heating and melting the aluminum ingot, the magnesium ingot, the aluminum-silicon alloy, the aluminum-manganese alloy and the aluminum-copper alloy into aluminum alloy liquid at 750 ℃;
(3) Adopting argon with purity more than or equal to 99.99% and refining agent with weight of 0.15% of the aluminum alloy liquid to carry out slag removal treatment on the aluminum alloy liquid in the furnace by blowing and refining for 20 minutes, and then removing scum on the surface of the aluminum alloy liquid;
(4) Introducing mixed gas consisting of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9% into aluminum alloy liquid in the furnace through an air brick arranged at the bottom of the furnace for degassing treatment, wherein the volume percentage of the chlorine in the mixed gas is 4%, the flow rate of the mixed gas is 0.4 cubic meter/min, and the degassing time is 15 min;
(5) Introducing the aluminum alloy liquid into a flow tank, and then adding an aluminum titanium boron alloy rod accounting for 0.5 percent of the total weight of the raw materials to carry out online grain refinement treatment;
(6) The aluminum alloy liquid sequentially flows through a degassing tank and a tubular filter tank which are arranged on a launder for online degassing and filtering treatment, the rotating speed of a graphite rotor in the degassing tank is 480 r/min, the gas flow rate on the graphite rotor is 2.5 cubic meters/h, the gas pressure is 0.5MPa, the gas is mixed gas composed of argon with the purity of more than or equal to 99.99% and chlorine with the purity of more than or equal to 99.9%, and the volume percentage of the chlorine in the mixed gas is 6%;
(7) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy casting rod with the diameter of 430 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the casting speed is 160 mm/min and the temperature of cooling water is 25 ℃;
(8) Heating the aluminum alloy casting rod at the temperature of 635 ℃ of a hearth for 1.5 hours, then reducing the temperature of the hearth to 595 ℃ and continuously heating for 3.5 hours for homogenizing treatment, and then spraying water mist to cool to room temperature to obtain the aluminum alloy casting rod with the diameter of 430 mm.
Wherein, the refining agent in the step (3) comprises the following components in percentage by mass ：ZnCl244.32％,K2CO325.01％,NaNO3 8.99％,KF 10.51％,K2SO4 7.02％,Li2SO44.15％,, and the preparation method of the refining agent sequentially comprises the following steps: (1) ZnCl 2、K2CO3、NaNO3、KF、K2SO4、Li2SO4 with the purity more than or equal to 99.8 percent is selected as a raw material for batching; (2) Heating and melting raw materials at 1150 ℃ under the protection of argon with purity more than or equal to 99.99%, and then cooling and solidifying the block refining agent; (3) And (3) crushing the block refining agent into powder with the particle size less than or equal to 2mm to obtain the refining agent.
Comparative example 1:
The diameter, composition of the components, and the casting and homogenizing process parameters of the aluminum alloy casting rod are the same as those of the example 1, except that the refining agent is a commercially available refining agent commonly used at present, and the refining agent consists of the following components in percentage by mass: 26.1% of NaCl,10.6% of Na 2SiF6, 17.1% of Na 2SO4, 6.9% of CaF 2, 9.3% of C 6Cl6, 14.3% of Na 2S2O3 and 15.7% of NaF.
Comparative example 2:
The diameter, composition and casting and homogenizing process parameters of the aluminum alloy casting rod are the same as those of the embodiment 2, except that the furnace bottom air brick is not adopted to introduce the mixed gas consisting of argon and chlorine into the aluminum alloy liquid in the furnace for degassing treatment.
Comparative example 3:
The diameter, composition of the components and casting and homogenizing process parameters of the aluminum alloy casting rod are the same as those of example 3, except that the tubular filter box is not used for filtering the aluminum alloy.
Comparative example 4:
The diameter, composition of the components and the technological parameters of casting are the same as those of example 4, except that the comparative example aluminum alloy casting rod is homogenized by adopting a traditional isothermal heating mode, the heating temperature is 595 ℃, and the heating time is 5 hours.
Verification example 1:
Melting points of the refining agents used in example 1 and comparative example 1 were measured by an OXFORD-DSC500 type differential scanning calorimeter, respectively, and the results are shown in table 1. As can be seen from Table 1, the refining agent of example 1 had a melting start temperature of 290℃and a melting end temperature of 716℃only. The refining agent of comparative example 1 had a melting start temperature of 564℃and a melting end temperature of 1249 ℃. As can be seen by comparison, the refining agent developed by the invention has lower melting initial temperature and melting end temperature, which shows that the refining agent developed by the invention is easier to be melted in aluminum alloy liquid, thereby being beneficial to improving the deslagging effect.
TABLE 1 melting points of the refining agents of example 1 and comparative example 1
Verification example 2:
The hydrogen content and the slag content of the aluminum alloy liquids before casting of examples 1 to 4 and comparative examples 1 to 4 were measured on site using an HDA-V hydrogen meter and an Analyze PoDFA slag meter, and the results are shown in Table 2. As can be seen from Table 2, the aluminum alloys of examples 1 to 4 had hydrogen contents of less than 0.08ml/100gAl and slag contents of less than 0.05mm 2/kg. In contrast, in comparative example 1, in which the conventional commercial refining agent was used for in-furnace blowing refining, in comparative example 2, in which no degassing of the hearth air brick was used, and in comparative example 3, in which no tube filtration was used, the gas slag content of the aluminum alloy liquid before casting was higher than that of the aluminum alloy liquid before casting in the examples. As can be seen by comparison, the method can greatly improve the cleanliness of the aluminum alloy casting rod.
Table 2 hydrogen content and slag content of aluminum alloy liquid before casting of examples and comparative examples
Verification example 3:
Samples were taken on the aluminum alloy cast bars obtained in examples 1 to 4 and comparative examples 1 to 4, and were processed into cylindrical test pieces having a diameter of 8 mm and a height of 10 mm, and then thermal compression tests were conducted on a GLEEBLE to 3800 thermal simulation tester at a heating temperature of 520 c, a compression load of 100kN, a compression deformation rate of 0.05 mm/s, and a maximum compression deformation amount of 70%, and the peak deformation resistance of the aluminum alloy cast bar test pieces was measured, and the results are shown in table 3. As can be seen from Table 3, the aluminum alloy cast bars of examples 1-4 each had a peak deformation resistance of less than 67MPa. Comparative examples 1 to 3 resulted in large deformation resistance of the aluminum alloy cast bars due to low cleanliness of the aluminum alloy cast bars, while comparative example 4 resulted in insufficient homogenization of the aluminum alloy cast bars due to the conventional isothermal heating homogenization process, resulting in a peak deformation resistance of the aluminum alloy cast bars of 5MPa or more. As can be seen by comparison, the invention can obviously reduce the deformation resistance of the aluminum alloy casting rod by optimizing the preparation process.
Table 3 Peak deformation resistance (Unit: MPa) of aluminum alloy cast bars of examples and comparative examples
Verification example 4:
The aluminum alloy cast bars of examples 1 to 4 and comparative examples 1 to 4 were heated to 500 ℃ and then extruded into photovoltaic aluminum profiles on the same die and extruder, and the highest extrusion speed of the aluminum alloy cast bars was recorded at the time of extrusion, and the results are shown in table 4. Finally, aging the aluminum profile for 6 hours at 185 ℃, cooling, sampling on the aluminum profile, processing into a tensile sample, stretching at room temperature on an electronic tensile testing machine, wherein the stretching rate is 2mm/min, and detecting the tensile strength, the yield strength and the elongation after breaking of the aluminum profile, wherein the results are shown in Table 5. As can be seen from Table 4, the highest extrusion speed of the aluminum alloy casting bars of examples 1 to 4 was ≡17mm/s. And the highest extrusion speed of the aluminum alloy casting bars of comparative examples 1-3 is less than or equal to 14mm/s. Compared with the prior art, the invention reduces the deformation resistance of the aluminum alloy casting rod by optimizing the casting process, and can obviously improve the extrusion speed of the aluminum alloy casting rod. As can be seen from Table 5, the tensile strength of the photovoltaic aluminum profiles of examples 1 to 4 is more than or equal to 289.5MPa, the yield strength is more than or equal to 271.3MPa, and the elongation after break is more than or equal to 12.9%. Compared with examples 1-4, the strength of the photovoltaic aluminum profiles of comparative examples 1-4 is generally lower by more than 10MPa and the elongation after break is generally lower by more than 2% under the condition that the components of the aluminum alloy cast bars are the same. Compared with the prior art, the preparation process of the aluminum alloy casting rod is optimized, so that the deformation resistance of the aluminum alloy casting rod can be reduced, the extrusion speed can be improved, and the strength and the plasticity of the photovoltaic aluminum profile can be improved.
TABLE 4 extrusion speed (unit: mm/s) of aluminum alloy cast bars of examples and comparative examples
Table 5 room temperature tensile mechanical properties of the photovoltaic aluminum profiles of examples and comparative examples
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Claims (8)
1. The aluminum alloy casting rod with large diameter and low deformation resistance is characterized by comprising the following components in percentage by mass: 0.5 to 0.9 percent of Si, 0.4 to 0.7 percent of Mg, 0.05 to 0.15 percent of Mn, 0.05 to 0.15 percent of Cr, 0.02 to 0.03 percent of Ti, 0.004 to 0.006 percent of B, 0 to 0.2 percent of Cu, less than or equal to 0.2 percent of Fe, the balance of Al and unavoidable impurity elements, the single content of the unavoidable impurity elements is less than or equal to 0.05 percent, and the total content of the impurity elements is less than or equal to 0.15 percent.
2. A method for preparing a large-diameter low-deformation-resistance aluminum alloy cast rod, characterized in that the method is used for preparing the large-diameter low-deformation-resistance aluminum alloy cast rod as claimed in claim 1, and comprises the following steps:
(1) According to the component composition and mass percentage of the aluminum alloy casting rod, selecting aluminum ingots, magnesium ingots, aluminum silicon alloy, aluminum manganese alloy, aluminum chromium alloy, aluminum copper alloy and aluminum titanium boron alloy rods as raw materials for proportioning;
(2) Adding an aluminum ingot, a magnesium ingot, aluminum-silicon alloy, aluminum-manganese alloy, aluminum-chromium alloy and aluminum-copper alloy into an aluminum melting furnace, and heating and melting the aluminum ingot, the magnesium ingot, the aluminum-silicon alloy, the aluminum-manganese alloy and the aluminum-copper alloy into aluminum alloy liquid at 740-760 ℃;
(3) Adopting argon and a refining agent to carry out slag removal treatment on aluminum alloy liquid in a furnace by blowing refining, and then removing scum on the surface of the aluminum alloy liquid;
(4) Introducing mixed gas consisting of argon and chlorine into the aluminum alloy liquid in the furnace through an air brick arranged at the bottom of the furnace for degassing treatment;
(5) Introducing the aluminum alloy liquid into a flow tank, and then adding an aluminum titanium boron alloy rod accounting for 0.4-0.6% of the total weight of the raw materials to carry out online grain refinement treatment;
(6) The aluminum alloy liquid sequentially flows through a degassing box and a tubular filter box which are arranged on a launder to carry out on-line degassing and filtering treatment;
(7) Semi-continuously casting the aluminum alloy liquid into an aluminum alloy casting rod under the conditions that the temperature of the aluminum alloy liquid is 680-720 ℃, the casting speed is 100-200 mm/min and the temperature of cooling water is 20-40 ℃;
(8) Heating the aluminum alloy casting rod at 635+/-5 ℃ of a hearth for 1-1.5 hours, then reducing the hearth temperature to 590+/-5 ℃ and continuously heating for 3-4 hours for homogenizing treatment, and then spraying water mist to cool to room temperature to obtain the aluminum alloy casting rod.
3. The method for producing a large-diameter low-deformation-resistance aluminum alloy cast rod according to claim 2, wherein in the step (1), the aluminum content of the aluminum ingot is not less than 99.7%, the magnesium content of the magnesium ingot is not less than 99.8%, the silicon content of the aluminum-silicon alloy is 25%, the manganese content of the aluminum-manganese alloy is 15%, the chromium content of the aluminum-chromium alloy is 20%, the copper content of the aluminum-copper alloy is 20%, the titanium content of the aluminum-titanium-boron alloy rod is 5%, and the boron content is 1%.
4. The method for producing a large-diameter low-deformation-resistance aluminum alloy casting rod according to claim 2, wherein the purity of the argon gas in the step (3) is not less than 99.99%, the amount of the refining agent is 0.1-0.2% by weight of the aluminum alloy liquid, and the blowing refining time is 15-25 minutes.
5. The method for producing a large-diameter low-deformation-resistance aluminum alloy cast rod as claimed in claim 2, wherein the refining agent in the step (3) is composed of the following components in mass percent ：ZnCl242-45％,K2CO3 24-26％,NaNO3 8-9％,KF 10-11％,K2SO4 7-8％,Li2SO4 4-5％.
6. The method for producing a large-diameter low-deformation-resistance aluminum alloy cast rod according to claim 2, wherein the method for producing the refining agent in step (3) comprises the following steps in order: (1) ZnCl 2、K2CO3、NaNO3、KF、K2SO4、Li2SO4 with the purity more than or equal to 99.8 percent is selected as a raw material for batching; (2) Heating and melting raw materials at 1150 ℃ under the protection of argon with purity more than or equal to 99.99%, and then cooling and solidifying the block refining agent; (3) And (3) crushing the block refining agent into powder with the particle size less than or equal to 2 mm to obtain the refining agent.
7. The method for producing a large diameter low deformation resistance aluminum alloy cast rod according to claim 2, wherein the purity of the argon gas in the step (4) is not less than 99.99%, the purity of the chlorine gas is not less than 99.9%, the volume percentage of the chlorine gas in the mixed gas is 3-5%, the flow rate of the mixed gas is 0.3-0.6 cubic meter/min, and the degassing time is 10-20 minutes.
8. The method for producing aluminum alloy cast bars with large diameter and low deformation resistance according to claim 2, wherein in the step (6), the rotational speed of the graphite rotor in the degassing tank is 400-500 rpm, the gas flow rate on the graphite rotor is 2-3 cubic meters per hour, the gas pressure is 0.4-0.6MPa, the gas is a mixed gas composed of argon with purity of 99.99% or more and chlorine with purity of 99.9% or more, and the volume percentage of the chlorine in the mixed gas is 5-10%.
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