CN114411001A - Rare earth modified aluminum magnesium silicon alloy and preparation method and application thereof - Google Patents
Rare earth modified aluminum magnesium silicon alloy and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a rare earth modified aluminum magnesium silicon alloy and a preparation method and application thereof. The method comprises the following steps: casting a rod: firstly melting an aluminum ingot, adding an Al-Si intermediate alloy, an Al-Ti intermediate alloy and an Al-rare earth alloy after melting, and then adding a magnesium ingot; melting and refining, and pouring aluminum bars after refining is completed; performing online filtration in the process of pouring the aluminum bar, adding an Al-Ti-B refiner, and then casting the aluminum bar into a solid aluminum bar by using a casting machine; homogenizing the cast rod, then carrying out extrusion forming or directly carrying out extrusion forming, and carrying out online quenching treatment in the extrusion forming process; and carrying out aging treatment on the extruded section to obtain the aluminum-magnesium-silicon alloy. The conductive tube with high strength and high conductivity can be prepared under the conditions of low cost and low energy consumption, and both the mechanical property and the conductivity greatly exceed the national standard.
Description
Technical Field
The invention belongs to the technical field of nonferrous metals and processing thereof, and particularly relates to a rare earth modified aluminum magnesium silicon alloy and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The aluminum alloy of the conductive tube is generally in a T6 state, and the conductivity is required to reach 50% IACS in the industry, and the tensile strength is required to be more than 205MPa (the hardness is 65 HB). With the implementation of national energy-saving and emission-reduction policies and the increase of weather such as strong wind, convection and severe cold in extreme weather, the performance of the conventional aluminum alloy conductive tube cannot meet the requirement of industrial production development.
The existing preparation method of the aluminum-magnesium-silicon alloy only considers the problem of product strength, does not consider the conductivity of the aluminum-magnesium-silicon alloy, and is not suitable for producing the aluminum alloy conductive tube with high conductivity requirement. Some aluminum-magnesium-silicon alloy preparation methods adopt a hot rolling method, but the hot rolling method is limited by the precision and the production efficiency, so that the aluminum alloy conductive tube cannot be produced at high speed and high precision.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a rare earth modified aluminum magnesium silicon alloy and a preparation method and application thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a preparation method of a rare earth modified aluminum magnesium silicon alloy comprises the following steps:
casting a rod: firstly melting an aluminum ingot, adding an Al-Si intermediate alloy, an Al-Ti intermediate alloy and an Al-rare earth alloy after melting, and then adding a magnesium ingot; melting and refining, and pouring aluminum bars after refining is completed; performing online filtration in the process of pouring the aluminum bar, adding an Al-Ti-B refiner, and then casting the aluminum bar into a solid aluminum bar by using a casting machine;
homogenizing the cast rod, then carrying out extrusion forming or directly carrying out extrusion forming, and carrying out online quenching treatment in the extrusion forming process;
and carrying out aging treatment on the extruded section to obtain the aluminum-magnesium-silicon alloy.
The aluminum-magnesium-silicon alloy has the advantages of moderate strength, high corrosion resistance, no stress corrosion cracking tendency, good welding performance, unchanged corrosion performance of a welding area, good formability, good process performance and the like, and is widely used in the fields of aviation, aerospace, automobiles, buildings, electric power, ships, conveying pipelines and the like. With the application and production of ultra-high voltage and extra-high voltage transmission equipment in the power industry, the requirements on the conductive tube are becoming more and more strict. The conducting tube of the extra-high voltage power grid is aluminum alloy of aluminum-magnesium-silicon series, has high specific strength and specific rigidity, is easy to form, and has good corrosion resistance and weldability. The invention improves the preparation method of the aluminum-magnesium-silicon alloy added with the rare earth elements, so that the obtained aluminum-magnesium-silicon alloy has the advantages of high strength and high conductivity. The high-conductivity aluminum alloy and the establishment of a rapid and low-cost preparation method have extremely important significance for cost control in the aspects of raw materials, labor, energy and the like for remote transmission in the power industry in China.
The bar of the invention can be directly extruded and molded or homogenized and then extruded and molded. The obtained Al-Mg-Si alloy has similar strength and conductivity.
The preparation method adopts an aging treatment method to treat the cast rod added with the rare earth element, which is beneficial to improving the mechanical property and the electric conductivity.
In some embodiments of the invention, the process of homogenizing: and (3) putting the aluminum bar into a homogenizing furnace, carrying out heat preservation treatment, taking out the aluminum bar, and carrying out cooling treatment on the aluminum bar to obtain a homogenized cast bar.
In some embodiments of the invention, the Al-rare earth alloy has a rare earth content of 9-11% by mass, and Ce: the mass ratio of La is 60-70: 35; further, Ce: the mass ratio of La is 65: 35.
in some embodiments of the invention, the temperature for melting the aluminum ingot during the rod casting process is 800-; further, the melting temperature of the aluminum ingot in the bar casting process is 800-950 ℃, and the temperature in the refining process is 740-780 ℃. In the bar casting process, firstly, the aluminum ingot is completely melted, then Al-Si intermediate alloy, Al-Ti intermediate alloy and Al-rare earth alloy are added for mixing, and the refining process comprises the refining processes of degassing, deslagging, standing and the like.
In some embodiments of the invention, the casting speed is 500-. In the process of casting the bar, the operation process needs to ensure the content of each element in the aluminum-magnesium-silicon alloy, and Fe, Cu, Cr, Mn, B, Ni and Zn are impurities, and the content of the elements needs to be strictly controlled in the casting process.
In some embodiments of the invention, solid aluminum bars having a cast bar diameter of 100 to 305mm are obtained.
In some embodiments of the invention, the extrusion process is carried out at a barrel temperature of 420-460 ℃, a die temperature of 470-510 ℃, an aluminum bar temperature of 470-510 ℃, an extrusion speed of 3-8 m/min, and a residual thickness of 30-40 mm.
In some embodiments of the invention, the quenching method during extrusion is: natural cooling, forced air cooling or water cooling.
In some embodiments of the invention, the temperature of the aging treatment is 170-; further 170 ℃ and 180 ℃, and the aging time is 7-8 hours; further 190-; further 190-; further 175 ℃, and the aging time is 8 hours; further 200 ℃, and the aging time is 2 hours; further 200 ℃ and an aging time of 5 hours. The existing method adopts a segmented gradient solid solution method, reduces the temperature difference between the surface of the aluminum alloy bar and the center of the bar, and effectively avoids the generation of coarse crystal rings under the condition of ensuring the mechanical property. The method is an aluminum alloy bar product, only considers the problem of product strength, does not consider the conductivity of the product, and is not suitable for the production of the aluminum alloy conductive tube with high conductivity requirement.
In a second aspect, the rare earth modified aluminum magnesium silicon alloy comprises the following components in percentage by weight: 0.45 to 0.85 percent of Mg, 0.35 to 0.7 percent of Si, 0.1 to 0.2 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.1 to 0.3 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al.
In some embodiments of the invention, the composition comprises the following components in percentage by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al.
In a third aspect, the preparation method of the rare earth modified aluminum magnesium silicon alloy or the application of the rare earth modified aluminum magnesium silicon alloy in manufacturing the conductive tube.
One or more technical schemes of the invention have the following beneficial effects:
according to the invention, the raw materials with rare earth elements are selected to prepare the aluminum-magnesium-silicon alloy, the rare earth elements Ce, La and mixed rare earth all have the effect of refining pure aluminum as-cast structure, and the rare earth elements can form intermetallic compounds at grain boundaries to become cores of heterogeneous nucleation, so that other alloy elements are easy to segregate and adsorb among grains, thereby playing the role of refining grains. At the same time canFe and Si elements with strong conductivity harmful to the material are taken as Al3.21Si0.47、FeAl3The form of the aluminum oxide precipitates from an aluminum matrix, and the conductivity of the material is greatly improved.
Homogenizing the rare earth modified cast aluminum bar and then using the homogenized cast aluminum bar for extrusion molding, or directly extruding the cast aluminum bar for molding, and performing aging strengthening treatment on the extruded section to finally obtain the high-strength and high-conductivity aluminum alloy. Compared with the existing preparation method, the balance and improvement of the high strength and the high conductivity of the aluminum-magnesium-silicon alloy can be achieved, and the application of the aluminum-magnesium-silicon alloy as a conductive tube is facilitated.
The conductivity of the aluminum-magnesium-silicon alloy at room temperature exceeds 60% IACS, the mechanical property strength exceeds 240MPa, the non-proportional extension strength exceeds 240MPa, the elongation after fracture reaches more than 15%, and the aluminum-magnesium-silicon alloy has excellent conductivity and mechanical property.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a comparison of tensile strengths of various examples.
FIG. 2 shows the conductivity comparison of the different examples.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The rod casting process of examples 1-6 was: firstly, melting 99.7% of aluminum ingot, completely melting at about 850 ℃, adding Al-Si intermediate alloy, Al-Ti intermediate alloy and Al-rare earth alloy after melting, stirring uniformly, and adding 99.9% of magnesium ingot; after complete melting, carrying out refining processes such as degassing, deslagging, standing and the like, controlling the refining temperature to be 740-780 ℃, and pouring the aluminum bar after refining is finished; after on-line filtering and Al-Ti-B refiner adding in the process of aluminum bar casting, a vertical semi-continuous casting machine of a multi-head crystallizer is adopted to cast solid aluminum bars with the diameter of phi 100-phi 305mm at the casting speed of 500-1200 mm/min.
The invention will be further illustrated by the following examples
Example 1
The rare earth modified aluminum-magnesium-silicon cast rod is prepared by a vertical semi-continuous casting method, and the cast rod comprises the following elements in parts by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al. Directly using the cast aluminum bar for extrusion forming, wherein the extrusion technological parameters are as follows: the extrusion cylinder temperature is 440 ℃, the die temperature is 490 ℃, the aluminum bar temperature is 490 ℃, the extrusion speed is 5m/min, and the residual thickness is 30 mm. The extruded section is cooled in a natural cooling mode, after the temperature of the section is reduced to room temperature, different aging treatments are carried out on the extruded section, and the aging treatment process is as follows: the aging temperature is 175 ℃, and the aging time is 8 hours; the aging temperature is 200 ℃, and the aging time is 2 hours; the ageing temperature is 200 ℃, and the ageing time is 5 hours.
Example 2
The rare earth modified aluminum-magnesium-silicon cast rod is prepared by a vertical semi-continuous casting method, and the cast rod comprises the following elements in parts by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al. And (3) putting the cast rod into a homogenizing furnace, preserving heat for 6 hours at 560 ℃, taking out the aluminum rod when the heat preservation time is up, cooling the aluminum rod by adopting strong wind until the temperature of the aluminum rod is 200 ℃, converting into water, and spraying and cooling to room temperature to obtain the homogenized cast rod. Carrying out extrusion molding by using a homogenized aluminum bar, wherein the extrusion process parameters are as follows: the extrusion cylinder temperature is 440 ℃, the die temperature is 490 ℃, the aluminum bar temperature is 490 ℃, the extrusion speed is 5m/min, and the residual thickness is 30 mm. . The extruded section is cooled in a natural cooling mode, after the temperature of the section is reduced to room temperature, different aging treatments are carried out on the extruded section, and the aging treatment process is as follows: the aging temperature is 175 ℃, and the aging time is 8 hours; the aging temperature is 200 ℃, and the aging time is 2 hours; the ageing temperature is 200 ℃, and the ageing time is 5 hours.
Example 3
The rare earth modified aluminum-magnesium-silicon cast rod is prepared by a vertical semi-continuous casting method, and the cast rod comprises the following elements in parts by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al. Directly using the cast aluminum bar for extrusion forming, wherein the extrusion technological parameters are as follows: the extrusion cylinder temperature is 440 ℃, the die temperature is 490 ℃, the aluminum bar temperature is 490 ℃, the extrusion speed is 5m/min, and the residual thickness is 30 mm. The extruded section is cooled by adopting an online forced air cooling mode, when the temperature of the section is reduced to room temperature, different aging treatments are carried out on the extruded section, and the aging treatment process is as follows: the aging temperature is 175 ℃, and the aging time is 8 hours; the aging temperature is 200 ℃, and the aging time is 2 hours; the ageing temperature is 200 ℃, and the ageing time is 5 hours.
Example 4
The rare earth modified aluminum-magnesium-silicon cast rod is prepared by a vertical semi-continuous casting method, and the cast rod comprises the following elements in parts by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al. And (3) putting the cast rod into a homogenizing furnace, preserving heat for 6 hours at 560 ℃, taking out the aluminum rod when the heat preservation time is up, cooling the aluminum rod by adopting strong wind until the temperature of the aluminum rod is 200 ℃, converting into water, and spraying and cooling to room temperature to obtain the homogenized cast rod. Carrying out extrusion molding by using a homogenized aluminum bar, wherein the extrusion process parameters are as follows: the extrusion cylinder temperature is 440 ℃, the die temperature is 490 ℃, the aluminum bar temperature is 490 ℃, the extrusion speed is 5m/min, and the residual thickness is 30 mm. The extruded section is cooled by adopting an online forced air cooling mode, when the temperature of the section is reduced to room temperature, different aging treatments are carried out on the extruded section, and the aging treatment process is as follows: the aging temperature is 175 ℃, and the aging time is 8 hours; the aging temperature is 200 ℃, and the aging time is 2 hours; the ageing temperature is 200 ℃, and the ageing time is 5 hours.
Example 5
The rare earth modified aluminum-magnesium-silicon cast rod is prepared by a vertical semi-continuous casting method, and the cast rod comprises the following elements in parts by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al. Directly using the cast aluminum bar for extrusion forming, wherein the extrusion technological parameters are as follows: the extrusion cylinder temperature is 440 ℃, the die temperature is 490 ℃, the aluminum bar temperature is 490 ℃, the extrusion speed is 5m/min, and the residual thickness is 30 mm. The extruded section is cooled by adopting an online water cooling mode, when the temperature of the section is reduced to room temperature, different aging treatments are carried out on the extruded section, and the aging treatment process is as follows: the aging temperature is 175 ℃, and the aging time is 8 hours; the aging temperature is 200 ℃, and the aging time is 2 hours; the ageing temperature is 200 ℃, and the ageing time is 5 hours.
Example 6
The rare earth modified aluminum-magnesium-silicon cast rod is prepared by a vertical semi-continuous casting method, and the cast rod comprises the following elements in parts by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al. And (3) putting the cast rod into a homogenizing furnace, preserving heat for 6 hours at 560 ℃, taking out the aluminum rod when the heat preservation time is up, cooling the aluminum rod by adopting strong wind until the temperature of the aluminum rod is 200 ℃, converting into water, and spraying and cooling to room temperature to obtain the homogenized cast rod. Carrying out extrusion molding by using a homogenized aluminum bar, wherein the extrusion process parameters are as follows: the extrusion cylinder temperature is 440 ℃, the die temperature is 490 ℃, the aluminum bar temperature is 490 ℃, the extrusion speed is 5m/min, and the residual thickness is 30 mm. The extruded section is cooled by adopting an online water cooling mode, when the temperature of the section is reduced to room temperature, different aging treatments are carried out on the extruded section, and the aging treatment process is as follows: the aging temperature is 175 ℃, and the aging time is 8 hours; the aging temperature is 200 ℃, and the aging time is 2 hours; the ageing temperature is 200 ℃, and the ageing time is 5 hours.
The aluminum alloy sections prepared in examples 1 to 6 were subjected to room temperature tensile property test using an electronic universal tester, and the results are shown in Table 1. Compared with the tensile strength 205MPa which is generally required in the aluminum alloy conductive tube industry, the tensile strength performance of the rare earth modified aluminum alloy extruded conductive tube is more excellent, the maximum improvement range is 41.6MPa, and the improvement range is 20.3%. At the same time, the extruded aluminum alloy sections were tested for electrical conductivity at 20 ℃ and the results are shown in table 2. Compared with the aluminum alloy conductive tube with the conductivity of 50% IACS required by the industry, the rare earth modified aluminum alloy conductive tube has the conductivity of up to 60% IACS and the conductivity of 20% higher. In addition, the rare earth modified aluminum alloy cast rod can be directly extruded, and the obtained section bar has excellent mechanical property and conductivity after aging treatment, so that the homogenization process of time and energy consumption is omitted, and the method has extremely important significance for energy conservation, emission reduction and cost control in the industry.
TABLE 1 examples 1-6 tensile Properties of aluminum alloy sections
Table 2 examples 1-6 conductivity of aluminium alloy profiles
As can be seen from the mechanical property results in Table 1 and FIG. 1, the Al-Mg-Si alloys obtained in examples 1-6 have high mechanical properties, the maximum tensile strength reaches 246.6MPa, the non-proportional elongation strength reaches 219.6, and the elongation after fracture reaches 10.7-17.3%.
From the conductivity results of table 2 and fig. 2, it can be seen that the conductivity of the al-mg-si alloy prepared in examples 1-6 reaches 61%.
In the embodiments 1, 3 and 5, heterogeneous aluminum bars are directly extruded and formed, and different online quenching modes are adopted, so that the obtained aluminum alloy sections have different mechanical properties and conductivity, in the embodiment 1, a natural cooling online quenching mode is adopted, in the embodiment 3, an online strong wind cooling online quenching mode is adopted, and in the embodiment 5, an online water cooling online quenching mode is adopted; in examples 2, 4 and 6, homogeneous aluminum bars are used for extrusion molding, different online quenching modes are adopted, the mechanical properties and the conductivity of the obtained aluminum alloy section are different, the online quenching mode of natural cooling is adopted in example 2, the online quenching mode of online strong wind cooling is adopted in example 4, and the online quenching mode of online water cooling is adopted in example 6. In each of examples 1, 2, 3, 4, 5 and 6, different aging temperatures and aging times were used for the treatments, and it can be seen that the mechanical properties and the electrical conductivity of the obtained profile were affected by the cooling method, the homogenization treatment and the aging treatment conditions. The profile obtained in example 6 is better in combination of mechanical properties and electrical conductivity.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of rare earth modified aluminum magnesium silicon alloy is characterized by comprising the following steps: the method comprises the following steps:
casting a rod: firstly melting an aluminum ingot, adding an Al-Si intermediate alloy, an Al-Ti intermediate alloy and an Al-rare earth alloy after melting, and then adding a magnesium ingot; melting and refining, and pouring aluminum bars after refining is completed; performing online filtration in the process of pouring the aluminum bar, adding an Al-Ti-B refiner, and then casting the aluminum bar into a solid aluminum bar by using a casting machine;
homogenizing the cast rod, then carrying out extrusion forming or directly carrying out extrusion forming, and carrying out online quenching treatment in the extrusion forming process;
and carrying out aging treatment on the extruded section to obtain the aluminum-magnesium-silicon alloy.
2. The method of preparing a rare earth-modified aluminum magnesium silicon alloy of claim 1, wherein: the mass content of rare earth in the Al-rare earth alloy accounts for 9-11%, and the mass ratio of Ce: the mass ratio of La is 60-70: 35.
3. the method of preparing a rare earth-modified aluminum magnesium silicon alloy of claim 1, wherein: the melting temperature of the aluminum ingot in the bar casting process is 800-950 ℃, and the temperature in the refining process is 700-800 ℃; further, the melting temperature of the aluminum ingot in the bar casting process is 800-950 ℃, and the temperature in the refining process is 740-780 ℃.
4. The method of preparing a rare earth-modified aluminum magnesium silicon alloy of claim 1, wherein: during the casting process by the casting machine, the casting speed is 500-1200 mm/min.
5. The method of preparing a rare earth-modified aluminum magnesium silicon alloy of claim 1, wherein: in the extrusion forming process, the temperature of an extrusion cylinder is 420-460 ℃, the temperature of a die is 470-510 ℃, the temperature of an aluminum bar is 470-510 ℃, the extrusion speed is 3-8 m/min, and the residual thickness is 30-40 mm.
6. The method of preparing a rare earth-modified aluminum magnesium silicon alloy of claim 1, wherein: the quenching method in the extrusion process comprises the following steps: natural cooling, forced air cooling or water cooling.
7. The method of preparing a rare earth-modified aluminum magnesium silicon alloy of claim 1, wherein: the temperature of the aging treatment is 170-200 ℃, and the aging time is 2-8 hours; further 170 ℃ and 180 ℃, and the aging time is 7-8 hours; further 190-; further 190 ℃ and 200 ℃, and the aging time is 5-6 hours.
8. A rare earth modified aluminum magnesium silicon alloy is characterized in that: the paint consists of the following components in percentage by weight: 0.45 to 0.85 percent of Mg, 0.35 to 0.7 percent of Si, 0.1 to 0.2 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.1 to 0.3 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al.
9. The rare earth-modified aluminum magnesium silicon alloy of claim 8, wherein: the paint consists of the following components in percentage by weight: 0.62 percent of Mg, 0.42 percent of Si, 0.15 percent of Fe, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Ti, less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Mn, 0.2 percent of rare earth, less than 0.05 percent of B + Ni + Zn and the balance of Al.
10. Use of a rare earth modified aluminium magnesium silicon alloy as claimed in any one of claims 1 to 7 or a rare earth modified aluminium magnesium silicon alloy as claimed in any one of claims 8 to 9 in the manufacture of a conductive tube.
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