EP1594999A4 - Tuyau d'aluminium et son procede de production - Google Patents

Tuyau d'aluminium et son procede de production

Info

Publication number
EP1594999A4
EP1594999A4 EP03782934A EP03782934A EP1594999A4 EP 1594999 A4 EP1594999 A4 EP 1594999A4 EP 03782934 A EP03782934 A EP 03782934A EP 03782934 A EP03782934 A EP 03782934A EP 1594999 A4 EP1594999 A4 EP 1594999A4
Authority
EP
European Patent Office
Prior art keywords
pipe
mass
aluminum pipe
aluminum
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03782934A
Other languages
German (de)
English (en)
Other versions
EP1594999A1 (fr
Inventor
Kazuyuki Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Resonac Holdings Corp
Original Assignee
Showa Denko KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Showa Denko KK filed Critical Showa Denko KK
Publication of EP1594999A1 publication Critical patent/EP1594999A1/fr
Publication of EP1594999A4 publication Critical patent/EP1594999A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0246—Arrangements for connecting header boxes with flow lines
    • F28F9/0256—Arrangements for coupling connectors with flow lines

Definitions

  • the present invention relates to aluminum pipes, and more particularly to aluminum pipes useful as inlet pipes and outlet pipes in heat exchanges, such as condensers or evaporators for motor vehicle air conditioners wherein a chlorofluorocarbon refrigerant is used, gas coolers or ' evaporators for motor vehicle air conditioners wherein C0 2 refrigerant is used, motor vehicle oil coolers andmotor vehicle radiators; aspipes forpipingin otorvehicle airconditioners which have a refrigeration cycle adapted for use with a chlorofluorocarbon refrigerant, the refrigeration cycle comprising a compressor, condenser and evaporator which are interconnected by the piping; and as pipes for piping in motor vehicle air conditioners which have a refrigeration cycle adapted for use with C0 2 refrigerant, the refrigeration cycle comprising a compressor, gas cooler, intermediate heat exchanger, expansion valve and evaporator which are interconnectedby the piping, and also to a process for producing such pipes.
  • aluminum as used herein and in the appended claims includes aluminum alloys in addition to pure aluminum. Incidentally, the metal represented by an atomic symbol of course does not include alloys thereof.
  • Condensers are known for use in motor vehicle air conditioners comprising a refrigeration cycle wherein a chlorofluorocarbon refrigerant is used.
  • Such condensers comprise a pair of aluminum headers arranged in parallel as spaced apart from each other, parallel.flat heat exchange tubes made of aluminum and joined at their opposite ends to the headers, a corrugated aluminum fin disposed in an air passage clearances between each pair of adjacent heat exchange tubes and brazed to the pair of heat exchange tubes, an inlet pipe of aluminum connected to one of the headers and an outlet pipe of aluminum connected to the other header.
  • the inlet pipe and the outlet pipe of the condenser described are conventionally produced, for example, from JIS A1100, JIS A3003 or an alloy containing 1.0 to 1.5 wt. % of Mn, at least 0.2 wt. % to less than 0.6 wt. % of Mg, and the balance Al and inevitable impurities (see the publication of JP-B No. 1991-22459) .
  • an aluminum pipe which is adapted for use inpiping formotor vehicle air conditioners for interconnecting the compressor, condenser and evaporator thereof and which is made from an alloy comprising 0.3 to 1.5 mass % of Mn, up to 0.20 mass % of Cu, 0.06 to 0.30 mass % of Ti, 0.01 to 0.20 mass % of Fe, 0.01 to 0.20 mass % of Si, and the balance Al and inevitable impurities, the matrix of the alloy containing particles of Si compounds, Fe compounds and Mn compounds which include up to 2 X 10 4 particles, not smaller than 0.5 ⁇ m in size, per square millimeter (see the publication of JP-A No. 2002-180171) .
  • An object of the present invention is to overcome the above problems and to provide an aluminum pipe which can be produced easily and inexpensively and which has satisfactory resistance to pitting corrosion, and also a process for producing the pipe.
  • the present invention provides an aluminum pipe made from an alloy containing 0.90 to 1.50 mass % of Mn, and the balance Al and inevitable impurities, the pipe having an electrical conductivity of 30 to 43% IACS .
  • the Mn content of the alloy for making the pipe should be 0.90 to 1.50 mass %, and is preferably 1.0 to 1.2 mass %.
  • the alloy for making the aluminum pipe should be 30 to 43% IACS, and is preferably 33 to 37% IACS, in electrical conductivity.
  • the pipe of the invention is 30 to 43% IACS in electrical conductivity, the pipe can be prevented from pitting without being subjected to any chromate treatment. Further because the pipe is made from an alloy containing 0.90 to 1.50 mass % of Mn and the balance Al and inevitable impurities, the pipe has an improved strength and canbe produced with high workability. Moreover, the pipe can be produced merely by holding a pipe blank heated at a predetermined temperature in the atmosphere or in an inert gas atmosphere for a predetermined period of time and thereafter cooling the blank. The pipe can therefore be produced easily at a lost cost.
  • the content of Cu as such an impurity is preferably up to 0.05 mass % since Cu as an inevitable impurity is likely to give the aluminum pipe impaired resistance to pitting corrosion even if present in a very small amount.
  • the Cu content is preferably up to 0.05 mass %.
  • the content of Fe as such an impurity is preferably up to 0.25 mass % because Fe as an inevitable impurity is likely to give the aluminumpipe impaired resistance to pitting corrosion although less influential than Cu. Accordingly, the Fe content is preferably up to 0.25 mass % .
  • the content of Si is preferably up to 0.25 mass % as an inevitable impurity because Si as such an impurity, like Fe, has the likelihood of giving the aluminum pipe lower resistance to pitting corrosion. Accordingly, the Si content is preferably up to 0.25 mass %.
  • the process of the invention for producing an aluminum pipe is characterized in that a pipe blank made from an alloy containing 0.90 to 1.50 mass % of Mn, and the balance Al and inevitable impurities is held heated at 550 to 600° C in the atmosphere or in an inert gas atmosphere for 10 to 600 minutes and thereafter cooled.
  • the pipe blank is held heated at the specified temperature for the specified period of time, thereby permitting the Mn and inevitable impurities in the alloy making the pipe blank to form solid solutions in the matrix, whereby the crystals and precipitates contained in the material and serving as nuclei for causing corrosion are diminished to give improved corrosion resistance.
  • the heating temperature is 550 to 600° C because if the temperature is lower than 550° C, sufficient quantities of solid solutions of Mn and inevitable impurities will not be formed in the matrix, and further because if the temperature is over 600° C, an economically poor efficiency only will result with no improvement achieved in the effect to form solid solutions of Mn and inevitable impurities in the matrix.
  • the blank is held heated for 10 to 600 minutes because if the period is less than 10 minutes, solid solutions of Mn and inevitable impurities will not be formed satisfactorily in the matrix, and further because if the period is in excess of 600 minutes, an economically poor efficiency only will result with no improvement achieved in the effect to form solid solutions of Mn and inevitable impurities in the matrix.
  • the production process of the invention produces the aluminumpipe described above relatively easily at a lost cost.
  • the alloy for making the pipe blank is the same as that of the aluminumpipe of the invention with respect to the Mn content and the contents of Cu, Fe and Si as inevitable • impurities in the alloy.
  • the rate of rise in temperature for heating is preferably 20 to 130° C/min.
  • the rate of rise in temperature is less than 20° C/min, an economically impaired efficiency will result, and that if the rate is in excess of 130° C/min, it is likely that other products, such as aluminum tubes, to be heated along with the present aluminum pipe will not be heated at a uniform rate of rise in temperature.
  • the pipe blank heated is thereafter cooled preferably at a rate of at least 47° C/min because if the cooling rate is less than 47° C/min, Mn and inevitable impurities dissolved in the matrix in the form of solid solutions will separate out again to possibly result in impaired corrosion resistance.
  • FIG. 1 is a perspective view showing a condenser which has an inlet pipe and an outlet pipe each comprising an aluminum pipe of the invention and which is adapted for use in motor vehicle air conditioners wherein a chlorofluorocarbon refrigerant is used.
  • FIG. 2 is a diagram showing a heating pattern in Examples 1 to 4.
  • a condenser 1 for use in motor vehicle air conditioners wherein a chlorofluorocarbon refrigerant is used ' comprises a pair of aluminum headers 2, 3 arranged inparallel and spaced apart from each other, parallel flat refrigerant tubes 4 (heat exchange tubes) made of aluminum extrudate and each joined at its opposite ends to the two headers 2, 3, corrugated fins 5 of aluminum brazing sheet each disposed in an air passage clearance between the adjacent refrigerant tubes 4 and brazed to the adjacent tubes 4, an inlet pipe 6 made of aluminum extrudate and connected to the upper end of peripheral wall of the first 2 of the headers, an outlet pipe 7 made of aluminum extrudate and connected to the lower end of peripheral wall of the second 3 of the headers, a first partition 8 provided inside the first header 2 and positioned above the midportion thereof, and a second partition 9 provided inside the second header 3 and positioned below the midportion thereof.
  • the refrigerant tube 4 to be used may be an electro-resistance welded tube.
  • the number of refrigerant tubes 4 between the inlet pipe 6 and the first partition 8, the number of refrigerant tubes 4 between the first partition 8 and the second partition 9 and the number of refrigerant tubes 4 between the second partition 9 and the outlet pipe 7 decrease from above downward to provide groups of channels.
  • a refrigerant flowing into the inlet pipe 6 in a vapor phase flows zigzag through units of channel groups in the condenser before flowing out from the outlet pipe 7 in a liquid phase.
  • Each of the inlet pipe 6 and the outlet pipe 7 is made from an alloy containing 0.90 to 1.50 mass % of Mn, and the balance Al and inevitable impurities.
  • the pipe is 30 to 43% IACS in electrical conductivity.
  • the alloy for making the inlet pipe 6 and the outlet pipe 7 has an Mn content preferably of 1.0 to 1.2 mass %.
  • the alloy for making the inlet pipe 6 and the outlet pipe 7 is preferably 33 to 37% IACS in electrical conductivity.
  • the Cu content is up to 0.05 mass % .
  • the alloy contains Fe as an inevitable impurity, the Fe content is up to 0.25 mass %.
  • the alloy contains Si as an inevitable impurity, the Si content is up to 0.25 mass %.
  • the inlet pipe 6 and the outlet pipe 7 are produced, for example, in the following manner.
  • the alloy described is extruded into an inlet pipe blank and an outlet pipe blank. These pipe blanks are held heated at 550 to 600° C in the atmosphere or in an inert gas atmosphere for 10 to 600 minutes and thereafter cooled.
  • the rate of rise in temperature for heating is 20 to 130° C/min, and the rate of cooling after the heating is a least 47° C/min. In this way, the inlet pipe 6 and the outlet pipe 7 are produced.
  • the aluminum pipe of the invention is used as the inlet pipe and outlet pipe of the condenser of a motor vehicle air conditioner comprising a refrigeration cycle wherein a chlorofluorocarbon refrigerant is used.
  • the aluminum pipe may be used as the inlet pipe and outlet pipe of the evaporator of the motor vehicle air conditioner.
  • the aluminum pipe of the invention may be used as the inlet and outlet pipes of heat exchangers for use as motor vehicle oil coolers, motor vehicle radiators, etc.
  • the aluminumpipe of the invention is useful for piping in motor vehicle air conditioners which have a refrigeration cycle adapted for use with a chlorofluorocarbon refrigerant, the refrigeration cycle comprising a compressor, condenser and evaporator which are interconnected by piping, and for piping in motor vehicle air conditioners which have a refrigeration cycle adapted for use with C0 2 refrigerant, the refrigeration cycle comprising a compressor, gas cooler, intermediate heat exchanger, expansion valve and evaporator which are interconnected by piping.
  • the aluminum pipe of the invention may further be used in motor vehicle air conditioners which have a refrigeration cycle adapted for use with C0 2 refrigerant and comprising a compressor, gas cooler, intermediate heat exchanger, expansion valve and evaporator, as the inlet and outlet pipes of the gas cooler and the evaporator.
  • a refrigeration cycle adapted for use with C0 2 refrigerant and comprising a compressor, gas cooler, intermediate heat exchanger, expansion valve and evaporator, as the inlet and outlet pipes of the gas cooler and the evaporator.
  • the pipe blanks were then placed into a preheating furnace set at an internal furnace temperature of 500° C, held in the furnace for 10 minutes, thereafter placed into a main heating furnace set at an internal furnace temperature of 601° C and held at a blank temperature of 600° C for 3 minutes, whereupon the pipe blanks were cooled to a blank temperature of 570° C with nitrogen gas .
  • the blanks were thereafter withdrawn from the main heating furnace.
  • the rate of rise in temperature for heating was 30° C/min, and cooling rate was 60° C/min.
  • FIG. 2 shows the heating pattern.
  • N* Number Comparative Examples 1-4
  • Four kinds of alloys having the respective compositions listed in Table 1 were extruded into pipe blanks 9.53 mm in outside diameter and 1.0 mm in the wall thickness of peripheral wall, and the pipe blanks were subjected to SWAAT 960 hr test without heat treatment and checked for the resulting corrosion.
  • the pipes were found to have pits extending through the peripheral walls thereof due to corrosion.
  • the aluminum pipe of the present invention is suitable as inlet pipes and outlet pipes in heat exchanges, such as condensers or evaporators for motor vehicle air conditioners wherein a chlorofluorocarbon refrigerant is used, gas coolers or evaporators for motor vehicle air conditioners wherein C0 2 refrigerant is used, motor vehicle oil coolers andmotor vehicle radiators; as pipes for the piping in motor vehicle air conditioners adapted for use with a chlorofluorocarbon refrigerant and comprising a compressor, condenser and evaporator which are interconnected by piping; and as pipes for piping in motor vehicle air conditioners adapted for use with C0 2 refrigerant and comprising a compressor, gas cooler, intermediate heat exchanger, expansion valve and evaporator which are interconnected by the piping.
  • heat exchanges such as condensers or evaporators for motor vehicle air conditioners wherein a chlorofluorocarbon refrigerant is used, gas coolers or evaporators for motor vehicle air conditioners where

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

La présente invention concerne un tuyau d'entrée (6) et un tuyau de sortie (7) pour condenseurs, en alliage d'aluminium au manganèse, le manganèse faisant 0,9 % à 1,5 % de la masse, le complément à 100 % correspondant à l'aluminium et aux impuretés résiduelles. L'électro-conductivité IACS de ces tuyaux est de 30 % à 43 %. Pour les réaliser, on part d'une ébauche faite dans l'alliage de l'invention, et on la maintient à une température de 550 °C à 600 °C sous atmosphère naturelle ou de gaz inerte pendant 10 à 600 minutes, après quoi on refroidit l'ébauche. Ces tuyaux d'entrée (6) et de sortie (7), qui sont faciles à produire à faible coût, présentent une bonne résistance à la corrosion profonde.
EP03782934A 2002-12-27 2003-12-26 Tuyau d'aluminium et son procede de production Withdrawn EP1594999A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2002380756 2002-12-27
JP2002380756 2002-12-27
US44062803P 2003-01-17 2003-01-17
US440628P 2003-01-17
PCT/JP2003/016921 WO2004061147A1 (fr) 2002-12-27 2003-12-26 Tuyau d'aluminium et son procede de production

Publications (2)

Publication Number Publication Date
EP1594999A1 EP1594999A1 (fr) 2005-11-16
EP1594999A4 true EP1594999A4 (fr) 2006-05-24

Family

ID=32716319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03782934A Withdrawn EP1594999A4 (fr) 2002-12-27 2003-12-26 Tuyau d'aluminium et son procede de production

Country Status (5)

Country Link
US (1) US20060243360A1 (fr)
EP (1) EP1594999A4 (fr)
KR (1) KR20050085891A (fr)
AU (1) AU2003290435A1 (fr)
WO (1) WO2004061147A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2919307B1 (fr) * 2007-07-27 2009-10-02 Alcan Rhenalu Sa Produit file en alliage d'aluminium ai-mg-si a resistance a la corrosion amelioree
JP2017036900A (ja) * 2015-08-13 2017-02-16 三菱重工業株式会社 放熱器およびそれを用いた超臨界圧冷凍サイクル
CN114938658B (zh) 2020-01-23 2024-07-05 三菱电机株式会社 制冷循环装置的室外机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000119784A (ja) * 1998-10-08 2000-04-25 Sumitomo Light Metal Ind Ltd 高温クリープ特性に優れたアルミニウム合金材およびその製造方法
WO2001066812A2 (fr) * 2000-03-08 2001-09-13 Alcan International Limited Alliages d'aluminium a resistance a la corrosion elevee apres brasage
US20010025676A1 (en) * 1999-05-28 2001-10-04 Kazuo Taguchi Aluminum alloy hollow material, aluminum alloy extruded pipe material for air conditioner piping and process for producing the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11172387A (ja) * 1997-12-04 1999-06-29 Furukawa Electric Co Ltd:The アルミニウム合金中空材及びその製造方法
JPH11172388A (ja) * 1997-12-08 1999-06-29 Furukawa Electric Co Ltd:The エアコン配管用アルミニウム合金押出管材およびその製造方法
JP4286431B2 (ja) * 2000-06-01 2009-07-01 古河スカイ株式会社 アルミニウム合金配管材の製造方法
JP4846124B2 (ja) * 2001-05-22 2011-12-28 住友軽金属工業株式会社 耐食性と加工性に優れた自動車の配管用アルミニウム合金管材の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000119784A (ja) * 1998-10-08 2000-04-25 Sumitomo Light Metal Ind Ltd 高温クリープ特性に優れたアルミニウム合金材およびその製造方法
US20010025676A1 (en) * 1999-05-28 2001-10-04 Kazuo Taguchi Aluminum alloy hollow material, aluminum alloy extruded pipe material for air conditioner piping and process for producing the same
WO2001066812A2 (fr) * 2000-03-08 2001-09-13 Alcan International Limited Alliages d'aluminium a resistance a la corrosion elevee apres brasage

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
HATCH J E: "Aluminium", ALUMINUM. PROPERTIES AND PHYSICAL METALLURGY, OHIO, AMERICAN SOCIETY FOR METALS, US, 1987, pages 278 - 281, XP002104156 *
NIPPES E L ET AL: "METALS HANDBOOK WELDING, BRAZING AND SOLDERING", METALS HANDBOOK. WELDING, BRAZING AND SOLDERING, vol. 6, 1983, pages 1022 - 1029, XP002374210 *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 07 29 September 2000 (2000-09-29) *
See also references of WO2004061147A1 *

Also Published As

Publication number Publication date
KR20050085891A (ko) 2005-08-29
WO2004061147A1 (fr) 2004-07-22
US20060243360A1 (en) 2006-11-02
EP1594999A1 (fr) 2005-11-16
AU2003290435A1 (en) 2004-07-29

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