WO2023054022A1 - Tube extrudé en alliage d'aluminium, son procédé de fabrication et élément tubulaire pour échangeur de chaleur - Google Patents

Tube extrudé en alliage d'aluminium, son procédé de fabrication et élément tubulaire pour échangeur de chaleur Download PDF

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Publication number
WO2023054022A1
WO2023054022A1 PCT/JP2022/034758 JP2022034758W WO2023054022A1 WO 2023054022 A1 WO2023054022 A1 WO 2023054022A1 JP 2022034758 W JP2022034758 W JP 2022034758W WO 2023054022 A1 WO2023054022 A1 WO 2023054022A1
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Prior art keywords
mass
extruded tube
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aluminum
aluminum alloy
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PCT/JP2022/034758
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English (en)
Japanese (ja)
Inventor
稜 東森
太一 鈴木
誠 安藤
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株式会社Uacj
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Publication of WO2023054022A1 publication Critical patent/WO2023054022A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to an aluminum alloy extruded tube, a manufacturing method thereof, and a heat exchanger piping member.
  • Heat exchanger piping and heat exchanger piping members such as hose joints are often made of aluminum alloys such as 3000 series alloys and 6000 series alloys.
  • the A6063 alloy is widely used as a piping member because it has excellent extrusion workability and can be strengthened by heat treatment after extrusion.
  • the Mg/Si ratio is set to 1.4 or more, Mg: 0.3 to 0.7% (mass%, the same applies hereinafter) and Si: 0.2 to 0.4%,
  • a pipe having good strength, workability, and corrosion resistance characterized by cooling an aluminum alloy ingot in which the remainder is substantially aluminum after hot extrusion, cooling at a cooling rate of 3 ° C./sec or more, and aging treatment by a conventional method.
  • a method for manufacturing aluminum alloy tubes for industrial applications is described.
  • aluminum waste materials such as discarded aluminum heat exchangers and scraps of aluminum products as raw materials for casting when producing aluminum alloy pipes.
  • the chemical composition of the aluminum scrap is not uniform, and the types of elements contained in the aluminum scrap and the content of each element differ depending on the use of the aluminum scrap.
  • the aluminum waste may sometimes be accompanied by parts or the like whose main component is a metal other than aluminum.
  • the content of elements other than the main elements tends to increase.
  • the content of elements other than the main elements in the chemical composition of the aluminum alloy pipe increases, the mechanical properties of the aluminum alloy pipe decrease, the deformation resistance increases during hot extrusion, the cold workability decreases, etc. various problems tend to occur.
  • the present invention has been made in view of this background, and is an aluminum alloy extruded tube that is excellent in manufacturability and mechanical properties even when the ratio of new aluminum ingots in the casting raw material is reduced, a method for producing the same, and the aluminum alloy.
  • An object of the present invention is to provide a heat exchanger piping member made of an alloy extruded tube.
  • One embodiment of the present invention includes: Si (silicon): 0.60 mass % to 1.8 mass %; Cu (copper): 0.10 mass % to 0.80 mass %; 50% by mass or more and 1.8% by mass or less, Mg (magnesium): more than 0% by mass and 0.50% by mass or less, and Zn (zinc): 0.10% by mass or more and 0.60% by mass or less, and the balance is Al (aluminum) and unavoidable impurities in the aluminum alloy extruded tube.
  • Another aspect of the present invention resides in a heat exchanger piping member comprising the aluminum alloy extruded tube of the above aspect.
  • Yet another aspect of the present invention is a method for manufacturing the aluminum alloy extruded tube of the above aspect, comprising: Casting an ingot having the chemical composition using a casting raw material containing 10% by mass or more of aluminum waste, Homogenization treatment is performed by holding the ingot at a temperature of 450 ° C. or higher and 620 ° C. or lower for 2 hours or more,
  • the method for producing an aluminum alloy extruded tube includes subjecting the ingot after the homogenization treatment to hot extrusion while the temperature is 400° C. or higher and 550° C. or lower to produce an aluminum alloy extruded tube.
  • extruded tube The aluminum alloy extruded tube (hereinafter referred to as “extruded tube”) has the specific chemical composition. Extruded tubes with such chemical compositions have excellent manufacturability and mechanical properties. In addition, in the aluminum alloy extruded tube, even when the content of minor elements such as Cu is relatively large, desired characteristics can be easily realized. Therefore, in producing the extruded tube, the proportion of new aluminum ingots in the casting raw material can be easily reduced, and the amount of aluminum waste material used can be increased.
  • the extruded tube has suitable properties as a heat exchanger piping member such as a heat exchanger piping and a hose joint. Therefore, the heat exchanger piping member composed of the extruded tube has good performance.
  • an ingot having the chemical composition is produced using a casting raw material containing 10% by mass or more of aluminum waste material.
  • a casting raw material containing 10% by mass or more of aluminum waste material.
  • the homogenization treatment and hot extrusion are performed on the ingot after the homogenization treatment under the specific conditions.
  • the conditions for homogenization treatment and hot extrusion within the above-described specific ranges, even when the ratio of new aluminum ingots in the casting raw material is reduced, the deformation resistance of the ingot during hot extrusion can be reduced. , an aluminum alloy extruded tube having excellent cold workability and mechanical properties can be easily obtained.
  • an aluminum alloy extruded tube excellent in manufacturability and mechanical properties even when the ratio of new aluminum ingots in the casting raw material is reduced, a method for producing the same, and the aluminum alloy extruded tube It is possible to provide a heat exchanger piping member consisting of.
  • [Chemical composition] - Si 0.60% by mass or more and 1.8% by mass or less
  • the extruded tube contains 0.60% by mass or more and 1.8% by mass or less of Si as an essential component.
  • Si has the effect of improving the strength of the extruded tube.
  • the strength of the extruded tube can be improved.
  • the Si content in the extruded tube it is possible to easily increase the ratio of the aluminum waste material in the casting raw material.
  • the Si content in the extruded tube is preferably 0.70% by mass or more. It is more preferably 80% by mass or more, and even more preferably 0.90% by mass or more. If the Si content in the extruded tube is less than 0.60% by mass, the strength of the extruded tube may be lowered. Moreover, in this case, it may become difficult to increase the ratio of aluminum scraps in the raw material for casting.
  • the Si content in the extruded tube is excessively high, the cold workability of the extruded tube may deteriorate.
  • the Si content in the extruded tube is preferably 1.6% by mass or less, more preferably 1.4% by mass or less. preferable.
  • Zn 0.10% by mass or more and 0.60% by mass or less
  • the extruded tube contains 0.10% by mass or more and 0.60% by mass or less of Zn as an essential component.
  • Zn is an element that can be contained together with Si in aluminum waste used as a casting raw material.
  • the Zn content in the extruded tube By setting the Zn content in the extruded tube to 0.10% by mass or more, preferably 0.15% by mass or more, and more preferably 0.20% by mass or more, the ratio of aluminum scraps in the casting raw material is increased. can be made easier. If the Zn content in the extruded tube is less than 0.10% by mass, it may become difficult to increase the ratio of aluminum scraps in the casting raw material.
  • the Zn content in the extruded tube is excessively high, the natural electrode potential of the extruded tube may be excessively lowered, resulting in deterioration of corrosion resistance.
  • the Zn content in the extruded tube is 0.60% by mass or less, preferably 0.55% by mass or less, and more preferably 0.50% by mass or less, deterioration of corrosion resistance can be easily avoided. .
  • the sum of the Si content and the Zn content in the extruded tube is preferably 0.80% by mass or more, more preferably 0.90% by mass or more, and 1.0% by mass. It is more preferable that it is above.
  • scraps of heat exchangers for automobiles and scraps of aluminum alloy clad materials used for heat exchangers for automobiles contain brazing filler metals made of Al—Si alloys and sacrificial anode materials made of Al—Zn alloys. ing. Therefore, when these aluminum waste materials are used as casting raw materials, the Si and Zn contents tend to be high.
  • the extruded tube contains 0.10% by mass or more and 0.80% by mass or less of Cu as an essential component.
  • Cu has the effect of improving the strength of the extruded tube.
  • the strength of the extruded tube can be improved.
  • the Cu content in the extruded tube is preferably 0.60% by mass or less, more preferably 0.50% by mass or less, It is more preferably 0.40% by mass or less.
  • Mn 0.50% by mass or more and 1.8% by mass or less
  • the extruded tube contains 0.50% by mass or more and 1.8% by mass or less of Mn as an essential component.
  • Mn has the effect of improving the strength of the extruded tube.
  • Mn can form an Al--Mn--Si intermetallic compound, an Al--Mn--Fe--Si intermetallic compound, etc. in the ingot during the manufacturing process of the extruded tube.
  • Mn content in the extruded tube By setting the Mn content in the extruded tube to 0.50% by mass or more, it is possible to improve the strength of the extruded tube and suppress the occurrence of cracks during cold working.
  • the content of Mn in the extruded tube is preferably 0.60% by mass or more, more preferably 0.70% by mass or more, and 0.70% by mass or more. It is more preferably 80% by mass or more. If the content of Mn in the extruded tube is less than 0.50% by mass, the strength and cold workability of the extruded tube may deteriorate. Moreover, in this case, it may become difficult to increase the ratio of aluminum scraps in the raw material for casting.
  • the content of Mn in the extruded tube is excessively high, the deformation resistance of the ingot during hot extrusion increases, which may lead to deterioration in extrusion processability.
  • the Mn content in the extruded tube is preferably 1.7% by mass or less, more preferably 1.6% by mass or less, It is more preferably 1.5% by mass or less.
  • the extruded tube contains more than 0% by mass and 0.50% by mass or less of Mg as an essential component.
  • Mg has the effect of improving the strength of the extruded tube.
  • the content of Mg in the extruded tube is preferably 0.05% by mass or more, more preferably 0.10% by mass or more. Moreover, in this case, it is possible to make it easier to increase the ratio of the aluminum waste material in the casting raw material.
  • the Mg content in the extruded tube is excessively high, the deformation resistance of the ingot during hot extrusion increases, which may lead to deterioration in extrusion processability.
  • the Mg content in the extruded tube is preferably 0.45% by mass or less, more preferably 0.40% by mass or less, It is more preferably 0.35% by mass or less.
  • the extruded tube further includes Fe (iron): more than 0% by mass and 0.50% by mass or less, Cr (chromium): more than 0% by mass and 0.10% by mass or less, and Ti (titanium). : more than 0% by mass and 0.10% by mass or less, Zr (zirconium): more than 0% by mass and 0.10% by mass or less, and V (vanadium): more than 0% by mass and 0.10% by mass or less. It may contain one or more elements as optional components.
  • the extruded tube may contain more than 0% by mass and 0.50% by mass or less of Fe as an optional component. Fe has the effect of improving the strength of the extruded tube.
  • the Fe content in the extruded tube is preferably 0.05% by mass or more, more preferably 0.10% by mass or more, and more preferably 0.15% by mass or more. It is more preferably at least 0.20% by mass, and particularly preferably at least 0.20% by mass.
  • the Fe content in the extruded tube is preferably 0.50% by mass or less, more preferably 0.45% by mass or less, and even more preferably 0.40% by mass or less to avoid deterioration of extrusion processability.
  • the strength of the extruded tube can be further improved.
  • ⁇ Cr more than 0 mass% and 0.10 mass% or less
  • Ti more than 0 mass% and 0.10 mass% or less
  • Zr more than 0 mass% and 0.10 mass% or less
  • V more than 0 mass% and 0.10 mass% % or less
  • more than 0% by mass and less than 0.10% by mass of Cr, more than 0% by mass and less than 0.10% by mass of Ti, more than 0% by mass and less than 0.10% by mass of Zr and 0% by mass % and 0.10% by mass or less of V selected from the group consisting of V may be contained as an optional component.
  • the content of these elements in the extruded tube is more preferably 0.01% by mass or more for each element, and is 0.02% by mass or more. is more preferable, and 0.03% by mass or more is particularly preferable.
  • the extruded tube may contain elements other than the elements described above as unavoidable impurities.
  • Elements that can be contained as unavoidable impurities include, for example, Li (lithium), Na (sodium), Ca (calcium), Ni (nickel), Sr (strontium), Sn (tin), Bi (bismuth), and the like. be done.
  • the content of these elements may be, for example, 0.05% by mass or less for each element.
  • the total content of elements as unavoidable impurities should be 0.50% by mass or less.
  • extruded tube The structure of the extruded tube is not particularly limited, and can take various forms.
  • extruded tubes may have cross-sectional shapes such as circular, oval, square, and rectangular.
  • the length of the extruded tube and the outer dimension of the cross section may be appropriately set according to the use of the extruded tube.
  • the wall thickness of the extruded tube is preferably 0.5 mm or more and 10 mm or less. If the wall thickness of the extruded tube is excessively thin, the pressure required for hot extrusion increases, which may make it difficult to perform hot extrusion. On the other hand, if the wall thickness of the extruded tube is excessively thick, the metal may not be sufficiently welded inside the die during hot extrusion, and cracks may easily occur in the extruded tube. By setting the wall thickness of the extruded tube within the specific range, these problems can be avoided and a sound extruded tube can be easily obtained.
  • the extruded tube has suitable properties as a heat exchanger piping member such as a heat exchanger piping or a hose joint.
  • a heat exchanger piping member having a desired shape can be easily obtained by subjecting the extruded tube to secondary processing such as cold working. can be done.
  • the heat exchanger piping member made of the extruded tube has excellent durability.
  • the heat exchanger piping member made of the extruded tube has excellent performance.
  • the casting method of the ingot is not particularly limited, and known casting methods such as DC casting and CC casting can be adopted.
  • the ratio of the aluminum waste material to the casting raw material is set to 10% by mass or more.
  • the proportion of aluminum waste in the raw material for casting is preferably 20% by mass or more, more preferably 30% by mass or more.
  • Aluminum waste materials used as raw materials for casting include, for example, discarded aluminum products, aluminum parts separated from discarded products, scraps and chips generated in the manufacturing process of aluminum products and aluminum parts, etc. included.
  • the aluminum waste may be melted as it is.
  • the scrap aluminum may be melted after adjusting the size thereof by cutting or compressing the scrap aluminum.
  • the recycled aluminum ingots may be used as raw materials for casting.
  • the ratio of aluminum scraps in the casting raw materials mentioned above includes the ratio of aluminum scraps in the recycled aluminum ingots.
  • the aluminum scrap When reusing the aluminum scrap as a raw material for casting, it is preferable to remove in advance the parts that are mainly composed of metals other than aluminum attached to the aluminum scrap, from the viewpoint of facilitating the adjustment of the chemical composition. From the same point of view, it is preferable to sort the aluminum waste in advance according to the degree of similarity of alloys contained in the aluminum waste.
  • the casting raw material contains Si: 0.50% by mass or more, Fe: 0.10% by mass or more, Cu: 0.10% by mass or more, Mn: 0.50% by mass or more, Mg: 0.05% by mass or more, Zn: Aluminum alloy scrap containing one or more elements selected from the group consisting of 0.10% by mass or more, automotive heat exchanger scrap, or aluminum alloy clad used for automotive heat exchangers Preferably, at least one type of scrap of material is included. These scraps often contain the essential components of the extruded tube. Therefore, by using these scraps as the raw material for casting, the chemical composition of the extruded tube can be more easily adjusted to the desired range while reducing the ratio of the aluminum virgin metal in the raw material for casting.
  • automotive heat exchanger scrap includes, for example, aluminum heat exchangers recovered from automobiles and their component parts.
  • scrap aluminum alloy clad materials used in heat exchangers for automobiles include, for example, brazing sheets containing brazing filler metal made of Al--Si alloys, and clad materials containing sacrificial anode materials made of Al--Zn alloys. and scraps of these materials.
  • scraps of automotive heat exchangers and scraps of aluminum alloy clad materials used in automotive heat exchangers contain Al—Si alloys constituting brazing filler metals and sacrificial anode materials.
  • Aluminum alloys having various chemical components, such as Al—Zn alloys, are often mixed. Therefore, although these scraps have conventionally been reused as casting raw materials for aluminum alloy casting materials whose chemical composition is relatively easy to adjust, scraps such as automotive heat exchangers are more chemically resistant than casting materials. It has been avoided to reuse it as a casting raw material for wrought materials, whose composition is difficult to adjust.
  • Si 0.50% by mass or more
  • Fe 0.10% by mass or more
  • Cu 0.10% by mass or more
  • Mn 0.50% by mass or more in the raw material for casting
  • Mg 0.05% by mass or more
  • Zn 0.10% by mass or more.
  • the sum of the scrap ratio and the scrap ratio of the aluminum alloy clad material used for automotive heat exchangers is preferably 10% by mass or more, more preferably 20% by mass or more, and 30% by mass or more. is more preferable.
  • the ingot is held at a temperature of 450°C or higher and 620°C or lower for two hours or longer for homogenization.
  • An ingot cast from a casting raw material containing aluminum waste is likely to form coarse crystallized substances derived from elements in the aluminum waste.
  • the coarse crystallized substances are decomposed by setting the holding temperature and the holding time in the homogenization treatment within the above specific ranges. , promotes granulation and resolution into the Al matrix, and can sufficiently homogenize the ingot.
  • the holding temperature in the homogenization treatment is preferably 500° C. or higher and 620° C. or lower.
  • the holding temperature in the homogenization treatment is lower than the specific range, or if the holding time is shorter than the specific range, the decomposition of crystallized substances in the ingot may be insufficient. . Moreover, if the holding temperature in the homogenization treatment is higher than the specific range, the ingot may be partially melted.
  • the holding time in the homogenization treatment is preferably 24 hours or less.
  • An aluminum alloy extruded tube can be obtained by subjecting the ingot after the homogenization treatment to hot extrusion while the temperature is 400°C or higher and 550°C or lower.
  • the extrusion method in hot extrusion is not particularly limited, and various methods such as porthole extrusion and mandrel extrusion can be employed.
  • the pressure required for hot extrusion may become excessively high, making hot extrusion difficult.
  • the extruded tube after extrusion has a defect called a tear defect, which looks like an aluminum alloy has been removed from the surface of the extruded tube. It might get easier.
  • the temperature of the ingot at the start of hot extrusion is preferably 420°C or higher, more preferably 440°C or higher.
  • the temperature of the ingot at the start of hot extrusion is preferably 540 ° C. or lower, more preferably 510 ° C. or lower, and 480 C. or less is more preferable, and 470.degree. C. or less is particularly preferable.
  • the extrusion ratio in hot extrusion that is, the ratio of the cross-sectional area of the ingot before extrusion to the cross-sectional area of the extruded tube obtained after extrusion is preferably 10 or more and 500 or less, and 100 or more and 200 or less. is more preferred.
  • the dimensions of the extruded tube can be adjusted by subjecting the extruded tube after hot extrusion to a drawing process, if necessary. Further, the extruded tube after hot extrusion or the extruded tube after drawing can be subjected to heat treatment as necessary to adjust the mechanical properties of the extruded tube. For example, when the extruded tube is to be tempered according to the temper represented by the temper symbol O, the extruded tube after hot extrusion may be heated to a temperature of 300° C. or higher and 560° C. or lower for softening treatment. . Further, when the extruded tube is to be tempered by a temper indicated by a temper symbol such as T5, T6 or T8, the extruded tube after hot extrusion is quenched and then aged. .
  • a temper indicated by a temper symbol such as T5, T6 or T8
  • the aluminum alloy extruded tube of this example has Si: 0.60% by mass or more and 1.8% by mass or less, Cu: 0.10% by mass or more and 0.80% by mass or less, Mn: 0.50% by mass or more and 1.8% by mass. % by mass or less, Mg: more than 0 mass % and 0.50 mass % or less, and Zn: 0.10 mass % or more and 0.60 mass % or less, with the balance being Al and unavoidable impurities. .
  • the method for producing the aluminum alloy extruded tube of this example is, for example, as follows. First, an ingot having chemical compositions (alloy symbols A1 to A2) shown in Table 1 is cast by DC casting.
  • the shape of the ingot can be, for example, a cylindrical shape with a diameter of 90 mm.
  • new aluminum ingots, recycled aluminum ingots, intermediate alloys and scrap aluminum can be used as the raw material for casting.
  • the symbol "Bal.” in Table 1 indicates that the element is the balance.
  • an aluminum alloy extruded tube can be obtained by subjecting the ingot to hot extrusion while the temperature of the ingot is 450°C.
  • Example 2 strips are produced by the same manufacturing method as in Example 1, and various characteristics are evaluated. Specifically, a strip having a width of 35 mm and a thickness of 3.0 mm made of the aluminum alloy shown in Table 2 is produced by the same manufacturing method as in Example 1.
  • the test materials S1 to S4 shown in Table 2 can be obtained by tempering this strip into either the temper represented by the temper symbol O or the temper represented by the temper symbol T5. .
  • the method of refining in this example is more specifically as follows.
  • the strip is cold-worked to reduce the thickness of the strip to 1.0 mm.
  • the strip material can be tempered according to the temper symbol O.
  • the strip immediately after hot extrusion is quenched by forced air cooling.
  • the strip is tempered by holding it at a temperature of 175° C. for 5 hours, so that the strip can be tempered according to the quality symbol T5.
  • test materials R1 to R2 shown in Table 2 are test materials for comparison with the test materials S1 to S4.
  • the method for producing test materials R1 to R2 was the same as the method for producing test materials S1 to S4, except that the chemical composition of the ingot and the treatment conditions in the homogenization treatment were changed as shown in Table 2.
  • the method for evaluating the manufacturability and mechanical properties of the aluminum alloy extruded pipe is as follows.
  • the extrusion workability of an aluminum alloy extruded tube can be evaluated based on the extrusion pressure during hot extrusion of the ingot and the appearance of the test material after cold working. Since the extrusion pressure changes depending on the extrusion ratio and the cross-sectional shape obtained by extrusion, it is preferable to evaluate by relative comparison with practical alloys.
  • the symbol "A” in the "Extrusion pressure” column of Table 2 indicates that the increase rate of the extrusion pressure when hot extruding the ingot with respect to the extrusion pressure when hot extruding the A6063 alloy is 25% or less.
  • the symbol "B" indicates an increase in extrusion pressure greater than 25%.
  • the mechanical properties of the aluminum alloy extruded tube can be evaluated based on the tensile strength of the test material. Specifically, after taking a No. 5 test piece specified in JIS Z2241:2011 from the central portion of each test material in the extrusion direction, the test piece is subjected to a tensile test by a method based on JIS Z2241:2011. Then, the tensile strength is calculated based on the test force-displacement curve obtained from the tensile test. Table 2 shows the tensile strength of each test material.
  • an aluminum alloy extruded tube having the same chemical composition as the test material exhibiting a tensile strength of 120 MPa or more showed a tensile strength of 95 MPa or more and a It is estimated to have a yield strength of 50 MPa or more.
  • An aluminum alloy extruded tube having such mechanical properties satisfies the mechanical properties required for heat exchanger piping, hose joints, and the like, and is therefore suitable as a heat exchanger piping member.
  • test materials S1 to S4 have the specific chemical components, they are excellent in hot extrusion workability, cold workability and mechanical properties.
  • test materials S1 to S4 contain relatively large amounts of elements other than aluminum, such chemical components can be easily obtained even when aluminum scraps are used as casting raw materials and the proportion of new aluminum ingots is reduced. can be realized.
  • the tensile strength of the test material R1 is lower than those of the test materials S1 to S4. Also, the test material R1 is inferior in cold workability. Since the content of Mg in the test material R2 is higher than the specific range, the extrusion workability of the test material R2 is inferior to the test materials S1 to S4.

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Abstract

Ce tube extrudé en alliage d'aluminium a une composition chimique contenant 0,60 % en masse à 1,8 % en masse de Si, 0,10 % en masse à 0,80 % en masse de Cu, 0,50 % en masse à 1,8 % en masse de Mn, plus de 0 % en masse à 0,50 % en masse de Mg, 0,10 % en masse à 0,60 % en masse de Zn, et le reste étant constitué d'Al et d'impuretés inévitables.
PCT/JP2022/034758 2021-09-28 2022-09-16 Tube extrudé en alliage d'aluminium, son procédé de fabrication et élément tubulaire pour échangeur de chaleur WO2023054022A1 (fr)

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JP2021158331A JP7222046B1 (ja) 2021-09-28 2021-09-28 アルミニウム合金押出管、その製造方法及び熱交換器用配管部材
JP2021-158331 2021-09-28

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Citations (5)

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JPH08225874A (ja) * 1995-02-14 1996-09-03 Furukawa Electric Co Ltd:The 自動車構造部材用アルミニウム合金押出材とその製造方法
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