KR20240096119A - Aluminum extruded material and method of manufacturing thereof - Google Patents

Abstract

The present invention relates to an aluminum extrusion material and a method for producing the same. The method for producing an aluminum extrusion material includes, in weight percent, Si: 0.3 to 0.7%, Mg: 0.3 to 0.7%, Cu: 0.02 to 0.1%, Fe: 0.1 to 0.5%. , Cr: 0.05 to 0.1%, Ti: 0.05 to 0.15%, alloying aluminum alloy components containing the balance of Al and other impurities, degassing the alloyed alloy with an inert gas, producing a billet by continuous casting. A step of homogenizing the billet, extruding the homogenized billet through an extruder, forcibly cooling the extruded extruded material, and cooling the cooled extruded material at a temperature range of 180 to 210 ° C. for 2 to 7 hours. It may include a heat treatment step.

Description

Aluminum extruded material and method of manufacturing the same {ALUMINUM EXTRUDED MATERIAL AND METHOD OF MANUFACTURING THEREOF}

The present invention relates to extruded materials, and more specifically to aluminum extruded materials and methods for manufacturing them.

In accordance with carbon neutrality and environmental regulations for transportation equipment, interest in aluminum, a lightweight material, is increasing, and the adoption of high-conductivity aluminum materials is increasing to secure the metal's heat dissipation ability to effectively control battery heat in electric vehicles. there is. The lithium-ion batteries in the electric vehicles are manufactured and supplied in the form of battery cells such as cylindrical, square, or pouch-type according to the customer's design. Due to the large amount of heat generated during operation, technology to secure and manage appropriate cooling capacity is essential. am. In terms of thermal management of electric vehicles, aluminum is selected as a material to properly dissipate heat generated from cells or modules, taking into account characteristics such as appropriate strength, excellent thermal conductivity, and formability.

Aluminum is a material used in extrusion processes with various cross-sectional shapes such as building materials, profiles, or pipes due to its excellent processability, and has recently been used as a frame with protection and heat dissipation functions from structural materials and cells/modules of battery packs for electric vehicles. The same material is used in various ways.

When selecting a material that secures strength and processability over a certain period of time using aluminum extrusions, when considering productivity and applicability, 6000 series alloy is selected. In most cases, appropriate strength and elongation are achieved through solution treatment and artificial aging processes. Secure. However, deformation of the material is inevitable during the cooling step that is inevitably accompanied by the heat treatment process, and due to the cooling step, separate additional processes such as selecting the shape of the product and employing a jig during the heat treatment process or post-calibration are required.

Specifically, the most widely used alloy among aluminum extrusions is the 6000 series with Mg and Si added, which secures the required strength and elongation during the heat treatment process after extrusion. The 6000 series alloy has a relatively small alloy amount, has appropriate medium strength characteristics through heat treatment, and is also used in parts that require heat dissipation characteristics due to its relatively high thermal conductivity characteristics.

In order to improve the properties of the 6000 series aluminum material, the most common heat treatment method for extruded or rolled materials is to sequentially perform solution treatment and artificial aging. However, the conventional solution treatment requires quenching, which is essential to maintain the supersaturated solid solution formed in the aluminum base metal after maintaining it at a certain temperature for a certain period of time, and as a result, the material deforms due to thermal shock or thermal deformation. This is inevitably triggered. Therefore, correction may not be possible for products with non-uniform shapes, such as long shapes, complex shapes, or unstable shapes.

In order to solve the above-mentioned problem, there is a technology for precipitating or diffusing silicon dispersed in an aluminum matrix and a technology for manufacturing a high-strength stretched aluminum extrusion material with a granular structure.

However, the above-described technologies are uneconomical as they require target alloy components, commercial processes, or additional processes, and there is a problem in that it is difficult to secure high strength and high elongation. In this way, there is a need for materials and process technologies that maintain high strength and secure elongation above a certain level by utilizing existing materials and process technologies and minimizing heat treatment.

The technical problem to be solved by the present invention is to provide an aluminum alloy extrusion material that maintains high strength and secures elongation above a certain level by utilizing existing materials and process technologies and minimizing heat treatment.

Another technical problem to be solved by the present invention is to provide a method of manufacturing an aluminum alloy extrusion material having the above-described advantages.

According to an embodiment of the present invention, the aluminum extrusion material has, in weight percent, Si: 0.3 to 0.7%, Mg: 0.3 to 0.7%, Cu: 0.02 to 0.1%, Fe: 0.1 to 0.5%, Cr: 0.05 to 0.1%. , Ti: 0.05 to 0.15%, the balance includes Al and other impurities, and can satisfy the following formula 1.

<Equation 1>

18 ≤ (yield strength + tensile strength)/elongation ≤ 40

(Yield strength, tensile strength, and elongation in Equation 1 above are measured values of the yield strength, tensile strength, and elongation of the aluminum extrusion material, respectively)

In one embodiment, the aluminum extrusion may include, by weight percent, V: 0.02 to 0.1% and Zr: 0.02 to 0.1%. In one embodiment, the average grain size may be 80 to 160 ㎛.

In one embodiment, the yield strength may be 170 to 208 MPa. In one embodiment, it may include a first precipitate containing Zr and a second precipitate containing V. In one embodiment, in weight percent, the first precipitate may include 0.1 to 0.5 weight percent, and the second precipitate may include 0.03 to 0.10 weight percent.

According to another embodiment of the invention, in weight percent, Si: 0.3 to 0.7%, Mg: 0.3 to 0.7%, Cu: 0.02 to 0.1%, Fe: 0.1 to 0.5%, Cr: 0.05 to 0.1%, Ti: Alloying aluminum alloy components containing 0.05 to 0.15% of Al and other impurities, degassing the alloyed alloy with an inert gas, manufacturing a billet by continuous casting, and homogenizing the billet. , extruding the homogenized billet through an extruder, forcibly cooling the extruded extruded material, and heat treating the cooled extruded material at a temperature range of 180 to 210 ° C. for 2 to 7 hours. In one embodiment, the aluminum alloy component may include V: 0.02 to 0.1% and Zr: 0.02 to 0.1% by weight.

In one embodiment, the step of forcibly cooling the extruded extruded material may include forcibly cooling the extruded material by spraying water on it. In one embodiment, the step of heat treating the cooled extruded material at a temperature range of 180 to 210° C. for 2 to 7 hours may be performed without separate solution treatment.

The aluminum extruded material according to an embodiment of the present invention contains fine elements, is forced to cool after extrusion, and then undergoes a heat treatment step, thereby providing an aluminum extruded material capable of securing high strength and high elongation.

A method for manufacturing an aluminum extrusion material according to another embodiment of the present invention provides a method for manufacturing an aluminum extrusion material having the above-described advantages.

1A and 1B show photographs of EBSD tissue according to an embodiment of the present invention.
Figure 2 shows a phase diagram according to temperature of an aluminum extrusion material, according to an embodiment of the present invention.

Terms such as first, second, and third are used to describe, but are not limited to, various parts, components, regions, layers, and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, the first part, component, region, layer or section described below may be referred to as the second part, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is only intended to refer to specific embodiments and is not intended to limit the invention. As used herein, singular forms include plural forms unless phrases clearly indicate the contrary. As used in the specification, “comprising” means specifying a particular characteristic, area, integer, step, operation, element and/or ingredient, and the presence or presence of another characteristic, area, integer, step, operation, element and/or ingredient. This does not exclude addition.

When a part is referred to as being “on” or “on” another part, it may be directly on or on the other part or may be accompanied by another part in between. In contrast, when a part is said to be "directly on top" of another part, there is no intervening part between them.

Although not defined differently, all terms including technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries are further interpreted as having meanings consistent with related technical literature and currently disclosed content, and are not interpreted in ideal or very formal meanings unless defined. Additionally, unless specifically stated, % means weight%, and 1ppm is 0.0001% by weight.

According to an embodiment of the present invention, the aluminum extrusion material has, in weight percent, Si: 0.3 to 0.7%, Mg: 0.3 to 0.7%, Cu: 0.02 to 0.1%, Fe: 0.1 to 0.5%, Cr: 0.05 to 0.1%. , Ti: 0.05 to 0.15%, including the balance of Al and other impurities. In one embodiment, the aluminum extrusion includes, by weight, V: 0.02 to 0.1% and Zr: 0.02 to 0.1%.

The reason for limiting the aluminum extrusion material to the above-described steel composition is as follows.

Si: 0.3 to 0.7%

Silicon (Si) is an element that contributes to solid solution strengthening and plays a role in forming aging precipitates. The silicon may be 0.3 to 0.7%, specifically 0.4 to 0.6%.

If the silicon content exceeds the upper limit, the solid solution strengthening effect takes precedence, and there is a problem in that the aging strengthening effect is not expressed. If the silicon content exceeds the lower limit, there is a problem in that the effect of aging strengthening is not realized.

Mg: 0.3 to 0.7%

Magnesium (Mg), like silicon, is an element that plays a role in forming aging precipitates. The magnesium may be 0.3 to 0.7%, specifically 0.4 to 0.6%.

If the magnesium content exceeds the upper limit, the solid solution strengthening effect takes precedence, and there is a problem in that the aging strengthening effect is not expressed. If the magnesium content exceeds the lower limit, there is a problem in that the effect of aging strengthening is not realized.

Cu: 0.02 to 0.1%

Copper (Cu) is an element that contributes to strength improvement through solid solution strengthening and precipitation age hardening after heat treatment. The copper may be 0.02 to 0.1%, specifically 0.05 to 0.8%.

If the copper content exceeds the upper limit, the solid solution strengthening effect takes precedence, and there is a problem in that the aging strengthening effect is not expressed. If the copper content exceeds the lower limit, there is a problem in that the effect of aging strengthening is not realized.

Fe: 0.5% or less

Iron (Fe) is a common impurity and needs to be kept below 0.5%. The iron content may be preferably 0.5% or less, specifically 0.1 to 0.5% or less. If the iron content exceeds the upper limit, there is a problem of causing embrittlement.

Cr: 0.1% or less

Chromium (Cr) maintains a recrystallized structure and excellent extrudability, and increases strength in solid solution or as a finely precipitated intermetallic phase. The chromium may be 0.1% or less, specifically 0.05 to 0.1%, and more specifically 0.07 to 0.09%.

Ti: 0.05 to 0.15%

Titanium (Ti) is an element added as a particle refiner during casting. The titanium may be included in an amount of 0.05 to 0.15%, specifically 0.08 to 0.12%. If the titanium content exceeds the upper limit, there is a problem of causing inclusions to form.

V: 0.02 to 0.1%

Vanadium (V) is an element that refines particles when solidified. The vanadium may be contained in an amount of 0.02 to 0.1%, specifically 0.03 to 0.08%. If the vanadium content exceeds the upper limit, it is not easy to manage the molten metal and some of it is segregated.

Zr: 0.02 to 0.1%

Zirconium (Zr) is an element that refines particles during solidification. The zirconium may be contained in an amount of 0.02 to 0.1%, specifically 0.03 to 0.08%. If the zirconium content exceeds the upper limit, it is not easy to manage the molten metal and there is a problem that some of it is segregated.

In this way, by including the vanadium and zirconium in the above-mentioned range, grain growth during the extrusion process can be suppressed.

In one embodiment, the aluminum extrusion material of the present invention may satisfy Equation 1 below.

<Equation 1>

18 ≤ (yield strength + tensile strength)/elongation ≤ 40

Equation 1 above refers to the ratio of the sum of yield strength and tensile strength to the elongation of the aluminum extrusion material. Formula 1 may be 18 to 40, specifically 20 to 39, and more specifically 22.5 to 38.95. Since the above equation 1 is an index for an aluminum extrusion material capable of securing high strength and high elongation at the same time, an aluminum extrusion material capable of securing high strength and high elongation can be provided by satisfying the above-mentioned range. If Equation 1 does not satisfy the above-mentioned range, there is a problem in that it is not possible to provide an aluminum extrusion material with excellent strength and elongation.

In one embodiment, the average grain size of the aluminum extrusion material may be 80 to 160 ㎛. Specifically, the average grain size may be 80 to 120 ㎛. Since the average grain size satisfies the above-mentioned range, there is an advantage in that it is possible to secure elongation above a certain level. On the other hand, when the average grain size does not satisfy the above-mentioned range, there is a problem in that it is difficult to secure the target elongation.

In one embodiment, the aluminum extrusion may include a first precipitate and a second precipitate. Specifically, the content of the first precipitate and the second precipitate may be 0.1 to 0.5% by weight and 0.03 to 0.10% by weight in weight%. Specifically, the content of the first precipitate and the second precipitate may be 0.2 to 0.4% by weight and 0.04 to 0.06% by weight in weight%. Specifically, the first precipitate and the second precipitate may be precipitates containing Zr or V, for example, DO22 and DO23 in FIG. 2.

By including the first precipitate and the second precipitate within the above-described range, there is an advantage in that it is possible to suppress the growth of crystal grains, make the crystal grains relatively fine, and secure elongation at a certain level or higher. If the first precipitate and the second precipitate are outside the above-mentioned range, there is a problem that the elongation cannot be secured above a certain level or the strength is excessively reduced.

According to another embodiment of the present invention, a method of manufacturing an aluminum extrusion material includes the steps of alloying aluminum alloy components, degassing the alloyed alloy with an inert gas, manufacturing a billet by continuous casting, and homogenizing the billet. Step, extruding the homogenized billet through an extruder, forcibly cooling the extruded extruded material; and heat treating the cooled extruded material. In the step of alloying the aluminum alloy component, the aluminum alloy component is the same as the component of the aluminum alloy material described above, so this may be referred to.

The step of alloying the aluminum alloy component may include, for example, manufacturing an alloy through a melting process. In one embodiment, the dissolution process may be performed at a temperature range of 700 to 750 °C.

Degassing the alloyed alloy with an inert gas means removing hydrogen gas from the alloyed alloy. The inert gas may be, for example, argon gas, chlorine-based gas, or fluorine-based gas.

In one embodiment, the degassing step may be performed at a temperature range of 650 to 750° C. and a time range of 3 to 10 minutes. In the degassing step, the content of unnecessary hydrogen gas can be controlled by removing hydrogen gas within the above-mentioned range.

After degassing the alloyed alloy with an inert gas, a purification process may be performed. The purification process may be a step of filtering out non-metallic inclusions in the alloyed alloy that has undergone the degassing step using a ceramic filter of 20 to 40 ppi. By filtering out non-metallic inclusions in the molten metal, the cleanliness of castings can be improved.

In the step of manufacturing a billet by continuous casting, an aluminum alloy billet for extrusion can be manufactured by injecting the alloyed alloy into a member such as a mold. In one embodiment, the step of manufacturing the billet may be performed at 680 to 710° C. and 60 to 100 mm/min.

In the step of manufacturing the billet, the holding temperature is outside the lower limit of the range, the time is outside the lower limit, or the homogenization heat treatment temperature is excessively low, resulting in a decrease in strength, corrosion resistance, and toughness due to insufficient re-solution characteristics. There is. If the time exceeds the upper limit or the homogenization heat treatment temperature is excessively high, re-employment is easily promoted, but not only are the dispersed particles coarse, but the number is also reduced, which inhibits recrystallization and grain refinement by high-density fine dispersion. .

In one embodiment, the step of cutting the played billet may be included between producing a billet by continuous casting and homogenizing the billet.

In the step of extruding the homogenized billet through an extruder, the homogenized billet may be heated and then extruded to form an extrudate. After the homogenization treatment, by going through the extrusion step, an aluminum alloy extruded material with improved durability and mechanical properties can be manufactured through a uniform microstructure.

The step of forcibly cooling the extruded extruded material is intensively forced cooling by water spraying or immersion. In one embodiment, in the step of forcibly cooling the extruded extruded material, the cooling rate may be performed at a cooling rate of 1 to 100° C./s. Specifically, it may be performed at 50 to 100 °C/s. If the cooling rate is outside the above-mentioned range, there is a problem that the extruded material is not cooled smoothly or is excessively cooled, causing changes in the tissue.

In one embodiment, the step of forcibly cooling the extruded extruded material may be performed without separate solution treatment. Specifically, in the step of forcibly cooling the extruded extruded material, strength can be secured without actually going through a high-temperature solutionization process by forcibly cooling the extruded material that can partially secure a supersaturated solid solution immediately after extrusion.

The step of heat treating the cooled extruded material includes heat treating the cooled extruded material at a temperature range of 180 to 210° C. for 2 to 7 hours. Specifically, the step of heat treating the extruded material includes heat treating the cooled extruded material at a temperature range of 200 to 210° C. for 2.5 to 5 hours.

If the holding time and temperature exceed the upper limit values, there is a problem in that strength decreases and elongation increases. If the holding time and temperature exceed the lower limit values, there is a problem in that strength decreases and elongation decreases.

In this way, through the addition of microelements, elongation is secured by suppressing the recrystallization-grain growth accompanying the extrusion process, and a method of forcibly cooling the aluminum extruded material immediately after extrusion is adopted, without separate high-temperature solution treatment during extrusion, to improve strength. can be secured.

Hereinafter, specific examples of the present invention will be described. However, the following example is only a specific example of the present invention, and the present invention is not limited to the following example.

Experiment example

In the aluminum alloy of the present invention, in the extrusion process, fine alloy elements V and Zr are added to improve formability without high temperature heat treatment while suppressing coarse grain growth during the recrystallization process, and Si and Mg are added to secure the physical properties of the material. The content was optimized. Specifically, the composition range for achieving the purpose of the present invention is shown in Table 1 below.

Si Fe Cu Mn Mg Cr Ti Zr V Al note alloy 1 0.47 0.15 0.04 0.07 0.45 0.06 0.07 - - Balance Example 1 alloy 2 0.47 0.15 0.04 0.07 0.45 0.06 0.07 0.05 0.05 Balance Example 2

Looking at Table 1, Example 1 is an alloy in which Si, Fe, Cu, Mn, Mg, Cr, Ti, and the balance of Al are included within the scope of the present invention, and Example 2 is an alloy in which Zr and V are added to Example 1. It is an alloy with additional additions.

Table 2 below summarizes the results according to the heat treatment process after reheating the billet made of alloy 1 at the same temperature. Specifically, Table 2 shows examples according to heat treatment temperature and time after extrusion and air cooling or forced cooling.

Experiment example Cooling
condition heat treatment
temperature
[℃] heat treatment
hour
[Hr] Hardness
[Hv] yield strength
[MPa] tensile strength
[MPa] elongation
[%] Equation 1
(yield strength + tensile strength)/elongation note Experimental Example 1 air cooling 205 2.5 69.5 179.6 214.6 6.2 63.58 Comparative example Experimental Example 2 air cooling 205 4 70 187.9 216.3 9.8 41.24 Comparative example Experimental Example 3 air cooling 205 5 70.2 192.3 222.4 6.9 60.10 Comparative example Experimental Example 4 air cooling 175 9 76.1 199.7 237.8 8.7 50.29 Comparative example Experimental Example 5 forced cooling 205 2.5 68.7 181.5 209.5 14 27.93 Example Experimental Example 6 forced cooling 205 4 66.7 183.4 210.6 14.8 26.62 Example Experimental Example 7 forced cooling 205 5 70.9 197.7 222 13 32.28 Example Experimental Example 8 forced cooling 175 9 76.3 204.9 233.8 7.5 58.49 Comparative example

Referring to Table 2, it was confirmed that during the extrusion process, when aging heat treatment was performed after cooling according to the cooling conditions, the hardness, yield strength, and tensile strength overall had similar characteristics. However, the elongation was confirmed to range from 6.2 to 9.8% when performed under air cooling conditions, and from 7.5 to 14.8% when performed under forced cooling. This is confirmed as a result of the fact that the recrystallized structure during extrusion at the extrusion outlet can be refined according to cold conditions, that is, cold ability, thereby increasing the elongation rate.

Table 3 below shows the results of comparing the physical properties of the forced cooled alloy 1 material according to heat treatment conditions.

number heat treatment temperature
[℃] heat treatment time
[Hr] Hardness
[Hv] yield strength
[MPa] tensile strength
[MPa] elongation
[%] Equation 1
(yield strength + tensile strength)/elongation note Experiment example 205 2.5 68.7 181.5 209.5 14 27.93 Example Experiment example 205 3.0 58 157.1 185.1 15.1 22.66 Example Experiment example 205 4.0 66.7 183.4 209.5 14.8 26.62 Example Experiment example 205 5.0 70.9 197.7 222 13 32.28 Example Experiment example 205 6.0 62.3 168.9 193.2 17.6 20.57 Example

Looking at Table 3 above, when considering elongation in terms of formability, it is possible to secure a high elongation of 15% or more, but it is necessary to consider the problem of relatively lower strength.

Table 4 below shows the results of extrusion and forced cooling of the billet of alloy 2 in Table 1 and heat treatment thereof.

number heat treatment
temperature
[℃] heat treatment
hour
[Hr] yield strength
[MPa] tensile strength
[MPa] elongation
[%] Equation 1
(yield strength + tensile strength)/elongation note Experiment example 195 2 170.27 219.08 10 38.94 Example Experiment example 195 2.5 184.78 226.82 12.92 31.86 Example Experiment example 195 3 190.75 230.05 12.75 33.00 Example Experiment example 195 5 208.88 235.62 13.56 32.78 Example Experiment example 200 3 185.40 222.93 18.17 22.47 Example Experiment example 200 4 192.30 225.90 17.17 24.36 Example Experiment example 200 5 201.77 229.00 15.60 27.61 Example

Looking at Table 4, compared to Tables 2 and 3 in which the heat treatment conditions of Alloy 1 were controlled, when the billet of Alloy 2 was extruded and forced cooled and heat treated, the tensile and yield strengths were excellent, and the elongation varied depending on the heat treatment time. It was confirmed that the strength and elongation were simultaneously increased above a certain level by securing around 10 to 18%.

1A and 1B show photographs of EBSD tissue according to an embodiment of the present invention.

Figure 1a shows the microstructure of an aluminum alloy extruded material according to alloy 1, and Figure 1b shows the microstructure of an aluminum alloy extruded material according to alloy 2. Specifically, billets having the compositions of Alloy 1 and Alloy 2 in Table 1 are continuously cast at a molten metal temperature of 690 to 720 ° C, the homogenization treatment temperature during extrusion is 450 ° C, and homogenization treatment is performed under the conditions of 12 hours, After extrusion of the billet at a preheating temperature of 430°C, the microstructure was analyzed.

Referring again to FIGS. 1A and 1B, it was confirmed that the average grain size of alloy 2 was relatively small compared to alloy 1. It was confirmed that Zr and V added in alloy 2 partially suppressed grain growth after recrystallization during the extrusion process.

Figure 2 shows a phase diagram according to temperature of an aluminum extrusion material, according to an embodiment of the present invention.

Figure 2 is a photograph of the structure of an aluminum extrusion material manufactured from the alloy of the present invention to which Zr and V were added through the manufacturing method of the present invention. Looking at Figure 2, it can be seen that the crystal grain size is small compared to Figure 1. It was confirmed that during the extrusion process, V and Zr precipitates finely deposited at the grain boundaries during recrystallization and grain growth are expressed by suppressing grain growth.

Specifically, since the precipitates of DO22 and 23 are contained and included above a certain level at the precipitation temperature, that is, at the heat treatment temperature, in the case of Composition 2, the precipitates are present above a certain level during the heat treatment process, making it possible to suppress grain growth during extrusion. It was confirmed that the crystal grains were relatively fine and that it was possible to secure elongation above a certain level.

The present invention is not limited to the above embodiments and/or examples, but can be manufactured in various different forms, and those skilled in the art may change the technical idea or essential features of the present invention. You will be able to understand that it can be implemented in other specific forms without doing so. Therefore, the implementation examples and/or embodiments described above should be understood in all respects as illustrative and not restrictive.

Claims (10)

In weight percent, Si: 0.3 to 0.7%, Mg: 0.3 to 0.7%, Cu: 0.02 to 0.1%, Fe: 0.1 to 0.5%, Cr: 0.05 to 0.1%, Ti: 0.05 to 0.15%, the balance Al and Contains other impurities,
An aluminum extrusion material that satisfies the following formula 1.
<Equation 1>
18 ≤ (yield strength + tensile strength)/elongation ≤ 40
(The yield strength, tensile strength, and elongation in Equation 1 above are measured values of the yield strength, tensile strength, and elongation of the aluminum extrusion material, respectively)
According to claim 1,
An aluminum extrusion comprising, in weight percent, V: 0.02 to 0.1% and Zr: 0.02 to 0.1%.
According to claim 1,
An aluminum extrusion material having an average grain size of 80 to 160 ㎛.
According to claim 1,
Aluminum extrusion material with a yield strength of 170 to 208 MPa.
According to clause 2,
An aluminum extrusion material comprising a first precipitate containing Zr and a second precipitate containing V.
According to clause 2,
An aluminum extrusion material comprising, in weight%, 0.1 to 0.5% by weight of the first precipitate and 0.03 to 0.10% by weight of the second precipitate.
In weight percent, Si: 0.3 to 0.7%, Mg: 0.3 to 0.7%, Cu: 0.02 to 0.1%, Fe: 0.1 to 0.5%, Cr: 0.05 to 0.1%, Ti: 0.05 to 0.15%, the balance Al and alloying aluminum alloy components containing other impurities;
Degassing the alloyed alloy with an inert gas;
Manufacturing a billet by continuous casting;
Homogenizing the billet;
Extruding the homogenized billet through an extruder;
Forcibly cooling the extruded extruded material; and
A method of producing an aluminum extrusion material comprising the step of heat treating the cooled extrusion material at a temperature range of 180 to 210° C. for 2 to 7 hours.
According to clause 7,
The aluminum alloy component is a method of producing an aluminum extrusion material including V: 0.02 to 0.1% and Zr: 0.02 to 0.1% by weight.
According to clause 7,
The step of forcibly cooling the extruded extruded material includes the step of forcibly cooling the extruded material by spraying water on the extruded material.
According to clause 7,
The step of heat treating the cooled extruded material at a temperature range of 180 to 210° C. for 2 to 7 hours is a method of manufacturing an aluminum extruded material, wherein the step is performed without separate solution treatment.