EP1446511B1 - Bandes en alliage d'aluminium pour echangeurs thermiques - Google Patents

Bandes en alliage d'aluminium pour echangeurs thermiques Download PDF

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Publication number
EP1446511B1
EP1446511B1 EP02790555A EP02790555A EP1446511B1 EP 1446511 B1 EP1446511 B1 EP 1446511B1 EP 02790555 A EP02790555 A EP 02790555A EP 02790555 A EP02790555 A EP 02790555A EP 1446511 B1 EP1446511 B1 EP 1446511B1
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EP
European Patent Office
Prior art keywords
alloy
strips
less
thickness
strips according
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.)
Expired - Lifetime
Application number
EP02790555A
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German (de)
English (en)
French (fr)
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EP1446511A2 (fr
Inventor
Sylvain Henry
Nathalie Remond
Bruno Chenal
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Constellium Issoire SAS
Original Assignee
Alcan Rhenalu SAS
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Application filed by Alcan Rhenalu SAS filed Critical Alcan Rhenalu SAS
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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
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/003—Aluminium alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • 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
    • C22F1/053—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 of alloys with zinc as the next major constituent

Definitions

  • the invention relates to the field of thin strips (thickness ⁇ 0.3 mm) of aluminum alloy for the manufacture of heat exchangers, in particular those used for engine cooling and air conditioning of the passenger compartment of motor vehicles.
  • the aluminum alloy strips for exchangers are used either bare or coated on one or both sides of a solder alloy.
  • the invention relates more particularly to uncoated strips used for fins or spacers attached to tubes or elements in contact with the cooling fluid.
  • Aluminum alloys are now very widely used in the manufacture of heat exchangers for the automobile because of their low density, which allows a weight gain, especially compared to copper alloys, while ensuring good thermal conduction, ease of implementation and good resistance to corrosion.
  • These exchangers comprise tubes for the circulation of the internal heating or cooling fluid and fins or spacers to ensure the heat transfer between the internal fluid and the external fluid, and their manufacture is done either by mechanical assembly or by soldering.
  • the fins or spacers must provide protection against galvanic perforation of the tubes, ie by providing for the fins an alloy having a lower electrochemical corrosion potential than for the tubes, so that the fin plays the role of sacrificial anode.
  • alloy 3003 The most commonly used alloy for the tubes being alloy 3003, an alloy of the same type is usually used for the fins with an addition from 0.5 to 2% zinc.
  • the composition of alloy 3003 recorded at the Aluminum Association is as follows (% by weight): If ⁇ 0.6 Fe ⁇ 0.7 Cu: 0.05 - 0.2. Mn: 1.0 -1.5 Zn ⁇ 0.1.
  • the strips in this type of alloy are generally obtained by semi-continuous casting of a plate, homogenization of this plate, hot rolling, then cold rolling with optionally an intermediate annealing and / or a final annealing. They can also be obtained by continuous casting of strips between two belts ("twin-belt casting") or between two cooled rolls (“twin-roll casting”).
  • Applicant's patent application WO 98/52707 describes a process for manufacturing aluminum alloy strips containing at least one of Fe (from 0.15 to 1.5%) or Mn (from 0.35 to 1.9%) with Fe + Mn ⁇ 2.5%, and optionally containing Si ( ⁇ 0.8%), Mg ( ⁇ 0.2%), Cu ( ⁇ 0.2%), Cr ( ⁇ 0 , 2%) or Zn ( ⁇ 0.2%) by continuous casting between cooled cylinders and shrink wrapped to a thickness between 1 and 5 mm, followed by cold rolling, the force applied to the casting rolls, expressed in tonnes per meter of bandwidth, being less than 300 + 2000 / e, where e is the thickness of the band expressed in mm.
  • the use of these strips for the production of brazed exchanger fins is mentioned.
  • the patent application WO 00/05426 of Alcan International describes the manufacture of aluminum alloy fin strips of composition: Fe: 1, -2 - 1.8%, Si: 0.7 - 0.95%, Mn: 0.3 - 0.5%, Zn: 0.3 - 2%, by continuous casting of strips with a cooling rate greater than 10 ° C / s.
  • the patent applications WO 01/53552 and WO 01/53553 of Alcan International also relate to the manufacture of finned iron alloy strips containing up to 2.4% iron by continuous casting and very rapid cooling. The goal is to obtain a more negative corrosion potential.
  • the fins or spacers must play a role of galvanic protection of the tubes, they must not however be too deteriorated by corrosion during the life of the exchanger. Indeed, it is necessary to maintain a sufficient integrity of the material, because if it perforates too quickly, the heat exchange will be less effective due to the loss of useful area. It could even occur a separation of the fin and the tube, which would block the thermal conduction between these components.
  • the object of the invention is therefore to obtain strips for fins or spacers of heat exchangers made of aluminum alloy intended in particular for the automotive industry, having both good mechanical strength, good formability and good resistance to wear. perforating corrosion while having a sacrificial anode role.
  • the subject of the invention is aluminum alloy strips with a thickness ⁇ 0.3 mm, intended for the manufacture of heat exchangers, of composition (% by weight): Si ⁇ 1.5 Fe ⁇ 2.5 Cu ⁇ 0.8 Mg ⁇ 1.0 Mn: ⁇ 1.8 Zn ⁇ 2.0 In ⁇ 0.2 Sn ⁇ 0.2 Bi ⁇ 0.2 Ti ⁇ 0.2 Cr ⁇ 0.25 Zr ⁇ 0.25 Si + Fe + Mn + Mg> 0.8, other elements ⁇ 0.05 each and ⁇ 0.15 in total, remaining aluminum, having between the surface and mid-thickness a difference in corrosion potential, measured with respect to a saturated calomel electrode according to ASTM G69, d. at least 10 mV.
  • the invention also relates to a process for producing such strips by continuous casting under conditions favoring the formation of segregations in the core of the strip, possibly hot rolling, cold rolling with possibly one or more intermediate annealing (s) or final from 1 to 20 hours at a temperature between 200 and 450 ° C.
  • the Applicant has found that by using, for alloys of type 3000 (Al-Mn) or type 8000 (Al-Fe) with possible zinc addition, continuous casting under particular casting conditions and with a range of transformation. adapted, bands with a corrosion potential gradient in their thickness, and that this property favored a lateral propagation rather than perpendicular to the surface of the corrosion, which ensured the sacrificial effect while avoiding the perforation, and therefore deterioration of the fin or interlayer over time.
  • This potential gradient is at least 10 mV.
  • this difference could be linked to the presence, for the particular casting conditions selected, of segregations at the center of the band, a phenomenon that is usually sought to be avoided, and which leads to compositional differences. in solid solution in the thickness of the strips.
  • the zinc content varies according to the alloy used for the tubes, so as to obtain an electrochemical potential difference between the tubes and the fins both sufficient to allow the fin to perform its role of sacrificial anode , and not too high to prevent it from deteriorating too fast.
  • indium, tin and / or bismuth can also be added up to a level of 0.2%.
  • the zinc content is preferably between 1.0 and 1.5%.
  • the zinc content should rather be kept below 0.8%.
  • the copper content is preferably maintained below 0.5%.
  • the optional addition of titanium up to 0.2%, zirconium up to 0.25% and / or chromium up to 0.25% makes it possible to improve the heat resistance ("SAG resistance") of the alloy.
  • the alloy used is a type 3003 alloy with a zinc content of up to 2%, that is to say an alloy of composition (% by weight): If ⁇ 1.0 Fe ⁇ 1.0 Cu ⁇ 0.8 Mg ⁇ 1.0 Mn: 0.8 - 1.8 Zn ⁇ 2.0 In ⁇ 0.2 Sn ⁇ 0.2 Bi ⁇ 0.2 Ti ⁇ 0.2 Cr ⁇ 0.25 Zr ⁇ 0.25 other elements ⁇ 0.05 each and ⁇ 0, 15 in total, remains aluminum.
  • the addition of silicon, preferably above 0.5% and up to 1% contributes to increasing the solidification range of the alloy, which promotes the appearance of segregations in the casting. Beyond 1%, it is possible to reach the burning temperature of the alloy during the soldering operation of the exchanger.
  • an alloy of the 8000 series of composition (% by weight) is used: If: 0.2 - 1.5 Fe: 0.2 - 2.5 Cu ⁇ 0.8 Mg ⁇ 1.0 Mn: ⁇ 1.0 Zn ⁇ 2.0 In ⁇ 0.2 Sn ⁇ 0.2 Bi ⁇ 0.2 Ti ⁇ 0.2 Cr ⁇ 0.25 Zr ⁇ 0.25 If + Fe> 0.8, other elements ⁇ 0.05 each and ⁇ 0.15 in total, remain aluminum.
  • a particularly suitable composition domain is the following: If: 0.8 - 1.5 Fe: 0.7 - 1.3 Mn ⁇ 0.1 Cu ⁇ 0.1 Mg ⁇ 0.1 and, preferably, Si: 1.0 - 1.3 and Fe: 0.9 -1.2.
  • the method of manufacturing the belts according to the invention comprises forming the alloy from an adjusted filler to obtain the desired alloy composition.
  • the metal is then continuously cast in the form of a strip of thickness between 1 and 30 mm, either by casting between belts between 12 and 30 mm, or, preferably, by casting between two rolls cooled and shrunk, at a distance of thickness between 1 and 12 mm.
  • casting parameters are chosen that favor the appearance of relatively large segregations in the core of the cast strip. In the case of casting between rolls, it is necessary that the contact between the metal and the cooled rolls is the best possible, so as to increase the thermal gradient on the surface of the metal during casting, which promotes segregation.
  • the various parameters on which one can act are in particular the length of the arc of contact between the metal and the cylinders, the force exerted by the rolls during the casting and the temperature of the rolls of the rolls.
  • a high contact arc preferably greater than 60 mm, is favorable to the formation of segregations. It is likewise with a high force, preferably greater than 100 + 2000 / and / m cast strip width, e being the thickness of the cast strip expressed in mm.
  • the temperature of the hoop must be as low as possible, preferably less than 100 ° C.
  • the cast strip is optionally, in the case of the casting between belts, hot rolled, and then cold rolled. On the other hand, the cast-rolled strip is directly cold-rolled.
  • the annealed strip is subjected to annealing at a temperature between 200 and 450 ° C. on the rolled strip to the final thickness.
  • the transformation range is adapted so that the reduction rate is adjusted to the target work hardening rate.
  • the fin or spacer plays its sacrificial role, but corrosion progresses laterally parallel to the surface, which prevents or delays perforation, ensures the integrity of the tube-fin assembly, and therefore a heat exchange continued.
  • the strips have a coarse-grained microstructure, favorable to the hot resistance during brazing.
  • a 5 mm thick strip was cast on a Jumbo 3Cm TM continuous casting plant from Pechiney Rhenalu, at a width of 1420 mm, with a force between the rolls of 780 t, a contact arc of 70 mm and a temperature of cylinders frets 70 ° C.
  • the strip was then cold rolled in one pass to the thickness of 0.7 mm, then subjected to an intermediate annealing of 12 h in an air oven programmed at 520 ° C to bring the metal to a temperature of 1 mm. order of 380 ° C, and cold rolled in three passes up to 130 ⁇ m.
  • a first part of the strip underwent a 2 hour restoration annealing at 350 ° C and then a rolling up to 100 ⁇ m.
  • a second part was recrystallized for 2 hours at 400 ° C. and then rolled up to 100 ⁇ m.
  • a third part underwent the same annealing, but a rolling up to 75 microns.
  • zinc alloy strips 3003 were made of composition: Yes Fe Cu mn mg Cr Or Zn Ti 0.22 0.57 0.12 1.15 - - - 1.4 - according to the same manufacturing range, but starting from a vertical semi-continuous casting process, with a 2-hour restoration annealing at 350 ° C, and a rolling up to 100 ⁇ m.
  • the static mechanical characteristics were measured on these bands: elastic limit R 0.2 , tensile strength R m and elongation A.
  • the metal obtained by continuous casting has both a better mechanical strength and a better elongation than the metal from conventional casting.
  • the evolution of the corrosion potential in the thickness was measured with respect to a saturated calomel electrode according to the ASTM G69 standard. We can see in the figure the presence, under the surface, and on a depth of about 15 ⁇ m from an area in which the potential is rapidly evolving from -890 mV to -870 mV.
  • a 6.1 mm thick strip was cast on a Davy TM continuous casting plant from Pechiney Eurofoil, at a width of 1740 mm, with a force between the rolls of 550 t, a contact arc of 60 mm and a cylinder roll temperature of 42 ° C.
  • the strip was then cold rolled to a thickness of 80 ⁇ m to obtain a H19 type metallurgical state.
  • the mechanical characteristics of this band are as follows: R m (MPa) R 0.2 (MPa) AT% 311 256 7.3
  • the elastic limit after brazing, R 0.2 , equal to 53 MPa is significantly greater than that obtained for conventional alloying strips 3003 used, obtained by conventional casting (of the order of 40-45 MPa).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Continuous Casting (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Conductive Materials (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Laminated Bodies (AREA)
EP02790555A 2001-11-19 2002-11-12 Bandes en alliage d'aluminium pour echangeurs thermiques Expired - Lifetime EP1446511B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0114948A FR2832497B1 (fr) 2001-11-19 2001-11-19 Bandes en alliage d'aluminium pour echangeurs thermiques
FR0114948 2001-11-19
PCT/FR2002/003866 WO2003044235A2 (fr) 2001-11-19 2002-11-12 Bandes en alliage d'aluminium pour echangeurs thermiques

Publications (2)

Publication Number Publication Date
EP1446511A2 EP1446511A2 (fr) 2004-08-18
EP1446511B1 true EP1446511B1 (fr) 2006-04-26

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ID=8869543

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Application Number Title Priority Date Filing Date
EP02790555A Expired - Lifetime EP1446511B1 (fr) 2001-11-19 2002-11-12 Bandes en alliage d'aluminium pour echangeurs thermiques

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US (2) US7811394B2 (es)
EP (1) EP1446511B1 (es)
JP (1) JP4484241B2 (es)
AT (1) ATE324470T1 (es)
AU (1) AU2002365952A1 (es)
CA (1) CA2467681C (es)
DE (2) DE02790555T1 (es)
ES (1) ES2263841T3 (es)
FR (1) FR2832497B1 (es)
WO (1) WO2003044235A2 (es)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2857981A1 (fr) * 2003-07-21 2005-01-28 Pechiney Rhenalu FEUILLES OU BANDES MINCES EN ALLIAGES AIFeSI
WO2005078372A1 (en) * 2004-02-12 2005-08-25 Showa Denko K.K. Heat exchanger and method for manufacturing the same
WO2005114087A2 (en) * 2004-05-21 2005-12-01 United Aluminum Corporation Fin stock for a heat exchanger and a heat exchanger
ATE426049T1 (de) * 2004-10-13 2009-04-15 Erbslih Aluminium Gmbh Aluminiumknetlegierung und warmetauscherkomponente aus dieser legierung
DE102005060297A1 (de) * 2005-11-14 2007-05-16 Fuchs Kg Otto Energieabsorbtionsbauteil
JP5055881B2 (ja) 2006-08-02 2012-10-24 日本軽金属株式会社 熱交換器用アルミニウム合金フィン材の製造方法およびフィン材をろう付けする熱交換器の製造方法
PL2090425T3 (pl) * 2008-01-18 2014-03-31 Hydro Aluminium Rolled Prod Tworzywo kompozytowe z warstwą antykorozyjną i sposób jego wytwarzania
DE102008056819B3 (de) * 2008-11-11 2010-04-29 F.W. Brökelmann Aluminiumwerk GmbH & Co. KG Aluminiumlegierung und Verfahren zur Herstellung eines Produkts aus einer Aluminiumlegierung
KR20120052666A (ko) * 2010-11-16 2012-05-24 삼성전자주식회사 바텀 샤시, 그 제조 방법 및 이를 포함하는 액정 표시 장치
JP6126235B2 (ja) 2012-12-06 2017-05-10 ナショナル ユニバーシティ オブ サイエンス アンド テクノロジー エムアイエスアイエス 耐熱性アルミニウムベース合金を変形させてなる半製品およびその製造方法
JP6154224B2 (ja) * 2013-07-05 2017-06-28 株式会社Uacj 熱交換器用アルミニウム合金フィン材およびその製造方法
JP6154225B2 (ja) * 2013-07-05 2017-06-28 株式会社Uacj 熱交換器用アルミニウム合金フィン材およびその製造方法
HUE045742T2 (hu) * 2015-02-23 2020-01-28 Aleris Rolled Prod Germany Gmbh Többrétegû alumínium keményforrasz lemezanyag
JP6564620B2 (ja) * 2015-06-02 2019-08-21 株式会社ケーヒン・サーマル・テクノロジー 熱交換器およびその製造方法
US20170003089A1 (en) * 2015-07-03 2017-01-05 Samsung Electronics Co., Ltd Heat exchanger and air conditioner including the same
CN106521246B (zh) * 2016-10-10 2018-01-02 上海华峰新材料研发科技有限公司 用于电池外壳铝合金防爆阀的材料及其制造方法
US20180251878A1 (en) * 2017-03-03 2018-09-06 Novelis Inc. High-strength, corrosion resistant aluminum alloys for use as fin stock and methods of making the same
CN110520547B (zh) * 2017-03-08 2021-12-28 纳诺尔有限责任公司 高性能3000系列铝合金
CN111074110B (zh) * 2020-01-10 2021-08-03 广西百矿润泰铝业有限公司 一种新能源动力电池壳用铝及铝合金板带材的生产方法
KR20230042846A (ko) * 2021-09-23 2023-03-30 삼성전자주식회사 고 내식성 열교환기
FR3134119A1 (fr) 2022-04-02 2023-10-06 Constellium Neuf-Brisach Tôle en alliage 6xxx de recyclage et procédé de fabrication

Citations (2)

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Publication number Priority date Publication date Assignee Title
US5954117A (en) * 1995-06-16 1999-09-21 Alcoa Aluminio Do Nordeste S.A. High speed roll casting process and product
WO2001053553A1 (en) * 2000-01-21 2001-07-26 Alcan International Limited Process of producing aluminum fin alloy

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US4334935A (en) 1980-04-28 1982-06-15 Alcan Research And Development Limited Production of aluminum alloy sheet
US4737198A (en) 1986-03-12 1988-04-12 Aluminum Company Of America Method of making aluminum foil or fin shock alloy product
JPS6434548A (en) * 1987-07-30 1989-02-06 Furukawa Aluminium Production of high strength aluminum foil
US5476725A (en) * 1991-03-18 1995-12-19 Aluminum Company Of America Clad metallurgical products and methods of manufacture
US5518064A (en) * 1993-10-07 1996-05-21 Norandal, Usa Thin gauge roll casting method
FR2723014B1 (fr) 1994-07-29 1996-09-20 Pechiney Rhenalu Procede et dispositif de correction de l'ovalisation de cylindres de coulee continue de bande metallique
FR2763602B1 (fr) 1997-05-20 1999-07-09 Pechiney Rhenalu Procede de fabrication de bandes en alliages d'aluminium par coulee continue mince entre cylindres
US20030196733A1 (en) * 1997-05-20 2003-10-23 Pechiney Rhenalu Cooking utensil made from aluminum alloy strips produced by continuous thin gauge twin roll casting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5954117A (en) * 1995-06-16 1999-09-21 Alcoa Aluminio Do Nordeste S.A. High speed roll casting process and product
WO2001053553A1 (en) * 2000-01-21 2001-07-26 Alcan International Limited Process of producing aluminum fin alloy

Also Published As

Publication number Publication date
JP2005509750A (ja) 2005-04-14
FR2832497A1 (fr) 2003-05-23
US7811394B2 (en) 2010-10-12
DE02790555T1 (de) 2005-03-31
DE60211011D1 (de) 2006-06-01
CA2467681C (fr) 2010-04-20
US20050034793A1 (en) 2005-02-17
FR2832497B1 (fr) 2004-05-07
JP4484241B2 (ja) 2010-06-16
ATE324470T1 (de) 2006-05-15
WO2003044235A2 (fr) 2003-05-30
AU2002365952A1 (en) 2003-06-10
EP1446511A2 (fr) 2004-08-18
AU2002365952A8 (en) 2003-06-10
CA2467681A1 (fr) 2003-05-30
WO2003044235A3 (fr) 2003-12-04
DE60211011T2 (de) 2006-11-30
ES2263841T3 (es) 2006-12-16
US20060260723A1 (en) 2006-11-23

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