EP1446511A2 - Aluminium alloy strips for heat exchangers - Google Patents

Aluminium alloy strips for heat exchangers

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Publication number
EP1446511A2
EP1446511A2 EP02790555A EP02790555A EP1446511A2 EP 1446511 A2 EP1446511 A2 EP 1446511A2 EP 02790555 A EP02790555 A EP 02790555A EP 02790555 A EP02790555 A EP 02790555A EP 1446511 A2 EP1446511 A2 EP 1446511A2
Authority
EP
European Patent Office
Prior art keywords
less
alloy
strips
casting
thickness
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.)
Granted
Application number
EP02790555A
Other languages
German (de)
French (fr)
Other versions
EP1446511B1 (en
Inventor
Sylvain Henry
Nathalie Remond
Bruno Chenal
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.)
Constellium Issoire SAS
Original Assignee
Pechiney Rhenalu SAS
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Application filed by Pechiney Rhenalu SAS filed Critical Pechiney Rhenalu SAS
Publication of EP1446511A2 publication Critical patent/EP1446511A2/en
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Classifications

    • 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 intended for the manufacture of heat exchangers, in particular those used for the cooling of engines and the air conditioning of the passenger compartment of motor vehicles.
  • Aluminum alloy strips for exchangers are used either bare or coated on one or two sides with a brazing alloy.
  • the invention relates more particularly to the uncoated strips used for the fins or spacers fixed 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 saving in weight, in particular compared to copper alloys, while ensuring a good thermal conduction, a ease of implementation and good corrosion resistance.
  • These exchangers include 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 carried out either by mechanical assembly or by brazing.
  • the fins or spacers must ensure protection of the tubes against perforation by galvanic effect, that is to say by providing for the fins an alloy having a lower electrochemical corrosion potential than for the tubes, so that the fin acts as a sacrificial anode.
  • the most commonly used alloy for tubes being alloy 3003, an alloy of the same type is usually used for the fins with an addition 0.5 to 2% zinc.
  • 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 possibly an intermediate annealing and / or a final annealing. They can also be obtained by continuous casting of bands between two belts ("twin-belt casting") or between two cooled cylinders ("twin-roll casting”). It is known that with this latter technique, in order to obtain a fine-grained structure in Al-Mn alloys, a homogenization of the blank is applied which eliminates the segregation resulting from casting, which leads to a good compromise between the mechanical strength and formability.
  • Patent application WO 98/52707 to the applicant describes a process for manufacturing aluminum alloy strips containing at least one of the elements Fe (from 0.15 to 1.5%) or Mn (from 0.35 at 1.9%) with Fe + Mn ⁇ 2.5%, and possibly containing Si ( ⁇ 0.8%), Mg ( ⁇ 0.2%), Cu ( ⁇ 0.2%), Cr ( ⁇ 0 , 2%) or Zn ( ⁇ 0.2%) by continuous casting between cooled and shrunk cylinders to a thickness between 1 and 5 mm, followed by cold rolling, the force applied to the casting cylinders, expressed in tonnes per meter of strip width, being less than 300 + 2000 / e, e being the thickness of the strip expressed in mm.
  • the use of these bands for the production of brazed exchanger fins is mentioned.
  • Patent application WO 00/05426 of Alcan International describes the manufacture of strips for fins made of aluminum alloy of composition: Fe: 1, -2 - 1.8%,
  • Patent applications WO 01/53552 and WO 01/53553 of Alcan International also relate to the manufacture of strips for fins made of iron alloys containing up to 2.4% of iron by continuous casting and very rapid cooling. The aim is to obtain a more negative corrosion potential. Purpose of the invention
  • the fins or spacers must play a galvanic protection role 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 punctures too quickly, the heat exchange will be less effective due to the loss of useful surface. There could even be 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 aluminum alloy heat exchangers intended in particular for the automotive industry, having both good mechanical strength, good formability and good resistance to perforating corrosion while having the role of a sacrificial anode.
  • the subject of the invention is strips of aluminum alloy 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, aluminum residue, having a difference in corrosion potential between the surface and the mid-thickness, measured with respect to a saturated calomel electrode according to ASTM G69, d '' at least 10 mV.
  • the invention also relates to a method of manufacturing such strips by continuous casting under conditions favoring the formation of segregations at the heart of the strip, possibly hot rolling, cold rolling with possibly one or more intermediate annealing (s). or final from 1 to 20 h at a temperature between 200 and 450 ° C.
  • FIG. 1 represents the evolution of the corrosion potential, measured with respect to a saturated calomel electrode, of a strip according to the invention of the alloy of example 1, as a function of the depth with respect to the surface.
  • FIG. 2 likewise represents the evolution of the corrosion potential of an alloy strip from Example 2.
  • the Applicant has found that by using, for alloys of type 3000 (Al-Mn) or of type 8000 (Al-Fe) with possible addition of zinc, the casting continues under specific casting conditions and with a transformation range suitable, we obtained strips with a corrosion potential gradient in their thickness, and that this property favored lateral propagation rather than perpendicular to the corrosion surface, which ensured the sacrificial effect while avoiding perforation, and therefore deterioration of the fin or the interlayer over time.
  • This potential gradient is at least 10 mV. According to a hypothesis put forward by the inventors, this difference could be linked to the presence, for the particular casting conditions selected, of segregations at the center of the strip, a phenomenon that is usually sought to avoid, and which leads to differences in composition. in solid solution in the thickness of the strips.
  • the zinc content varies depending on the alloy used for the tubes, so as to obtain a difference in electrochemical potential between the tubes and the fins that is sufficient to allow the fin to fulfill its role as a sacrificial anode. , and not too high to avoid too rapid deterioration.
  • indium, tin and / or bismuth can also be added up to a content of 0.2%.
  • the zinc content is preferably between 1.0 and 1.5%.
  • tubes of Al-Mn ps alloy loaded with copper such as for example the alloys with more than 0.4%> of copper described in patent application EP 1075935 of the applicant, the zinc content must rather be kept below 0.8%.
  • the copper content is preferably kept below 0.5% o.
  • the possible 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 ("resistance SAG") of the alloy.
  • the alloy used is an alloy of the type
  • silicon preferably beyond 0.5% and up to 1% contributes to increasing the solidification interval of the alloy, which promotes the appearance of segregation during casting. Above 1%, there is a risk of reaching the burning temperature of the alloy during the brazing operation of the exchanger.
  • a particularly suitable composition range is as follows: Si: 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 strips according to the invention comprises the development of the alloy from a charge adjusted 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 cooled and hooped cylinders, at a thickness between 1 and 12 mm.
  • casting parameters are chosen which favor the appearance of relatively large segregations at the heart of the cast strip. In the case of casting between rolls, this requires that the contact between the metal and the cooled rolls is the best possible, so as to increase the thermal gradient at 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 cylinders during casting and the temperature of the frets of the cylinders.
  • a high contact arc preferably greater than 60 mm, is favorable for the formation of segregations. It is likewise a high effort, preferably greater than 100 + 2000 / and / m of width of the cast strip, e being the thickness of the cast strip expressed in mm.
  • the temperature of the frets must be as low as possible, preferably less than 100 ° C.
  • the casting strip is optionally, in the case of casting between belts, hot rolled, and then cold rolled. On the other hand, the strip cast between cylinders is directly cold rolled.
  • the final thickness is small enough, it is necessary to provide at least one intermediate annealing at a temperature between 200 and 450 ° C. If the metal is to be delivered in the annealed condition, the laminated strip is annealed at a temperature between 200 and 450 ° C. In the case where the metal is delivered in the work hardened state, the transformation range is adapted so that the reduction rate is adjusted to the target work hardening rate.
  • the strips according to the invention make it possible to produce fins or spacers of heat exchangers having a high mechanical strength, which makes it possible to reduce the thickness compared to a fin or a spacer according to the prior art, while keeping good formability.
  • the fin or the 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, which is favorable to heat resistance during brazing.
  • a 5 mm thick strip was cast on a Jumbo 3Cm TM continuous casting installation from the company Pechiney Rhenalu, at a width of 1420 mm, with a force between the cylinders of 780 1, a contact arc of 70 mm and a temperature of cylinder frets of 70 ° C.
  • the strip was then cold rolled in one pass to the thickness 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 l '' 380 ° C, and cold rolled in three passes up to 130 ⁇ m.
  • the first part of the strip underwent a restorative annealing of 2 h at 350 ° C, then a rolling up to 100 ⁇ m.
  • a second part underwent a recrystallization annealing of 2 h at 400 ° C, then a rolling up to 100 ⁇ m.
  • a third part underwent the same annealing, but rolling up to 75 ⁇ m.
  • strips of alloy 3003 with zinc of composition were manufactured:
  • the metal obtained by continuous casting has both better mechanical strength and better elongation than the metal obtained from traditional casting.
  • the evolution of the corrosion potential in the thickness was measured, relative to a saturated calomel electrode according to the ASTM G69 standard. We can see in the figure the presence, below the surface, and on a depth of about 15 ⁇ m, of an area in which the potential evolves rapidly from -890 mV to -870 mV.
  • a 6.1 mm thick strip was cast on a Davy TM continuous casting installation from the company Pechiney Eurofoil, at a width of 1740 mm, with a force between the cylinders of 550 t, a contact arc of 60 mm and a temperature of the frets of the cylinders of 42 ° C.
  • the strip was then cold rolled to the thickness of 80 ⁇ m, to obtain an H19 type metallurgical state.
  • the mechanical characteristics of this strip are as follows:
  • this metal produced by continuous casting, has an excellent compromise between mechanical strength and elongation.
  • a typical brazing cycle was then applied to the metal, in an oven under a nitrogen atmosphere, comprising a 2-minute plateau at 600 ° C.
  • the elastic limit after brazing, R 0 equal to 53 MPa is significantly higher than that obtained for strips of alloy 3003 traditionally used, obtained by conventional casting (of the order of 40-45 MPa). From the point of view of corrosion resistance, we find on these alloys 8xxx, as we can see in Figure 2, and always in connection with the casting process used, an evolution of the corrosion potential in the thickness of the metal, the beneficial nature of which was explained above for 3xxx alloys.

Abstract

Aluminum alloy strip with a thickness of less than 3 mm for the fabrication of brazed heat exchangers has the following composition, by wt %: Si less than 1.0; Cu less than 0.5; Fe less than 0.7; Mg less than 0.1; Mn : 0.8 - 1.5; Zn less than 2.0; In less than 0.2; Sn less than 0.2; Bi less than 0.2; Ti less than 0.2; Cr less than 0.25; Zr less than 0.25; and other elements less than 0.05 each and less than 0.15 in total. The aluminum alloy strip has a corrosion potential difference of at least 10 mV between its surface and its mid-thickness, measured with respect to a calomel saturated electrode according to the ASTM G69 Standard. An Independent claim is also included for a method for the fabrication of this aluminum alloy strip.

Description

Bandes en alliage d'aluminium pour échangeurs thermiques Aluminum alloy strips for heat exchangers
Domaine de l'inventionField of the invention
L'invention concerne le domaine des bandes minces (épaisseur < 0,3 mm) en alliage d'aluminium destinées à la fabrication des échangeurs thermiques, notamment ceux utilisés pour le refroidissement des moteurs et la climatisation de l'habitacle des véhicules automobiles. Les bandes en alliage d'aluminium pour échangeurs sont utilisées soit nues, soit revêtues sur une ou deux faces d'un alliage de brasage. L'invention concerne plus particulièrement les bandes non revêtues utilisées pour les ailettes ou intercalaires fixés sur des tubes ou des éléments en contact avec le fluide de refroidissement.The invention relates to the field of thin strips (thickness <0.3 mm) of aluminum alloy intended for the manufacture of heat exchangers, in particular those used for the cooling of engines and the air conditioning of the passenger compartment of motor vehicles. Aluminum alloy strips for exchangers are used either bare or coated on one or two sides with a brazing alloy. The invention relates more particularly to the uncoated strips used for the fins or spacers fixed to tubes or elements in contact with the cooling fluid.
Etat de la techniqueState of the art
Les alliages d'aluminium sont maintenant très largement utilisés dans la fabrication des échangeurs thermiques pour l'automobile en raison de leur faible densité, qui permet un gain de poids, notamment par rapport aux alliages cuivreux, tout en assurant une bonne conduction thermique, une facilité de mise en œuvre et une bonne résistance à la corrosion. Ces échangeurs comportent des tubes pour la circulation du fluide interne de chauffage ou de refroidissement et des ailettes ou intercalaires pour assurer le transfert thermique entre le fluide interne et le fluide externe, et leur fabrication se fait soit par assemblage mécanique, soit par brasage. En plus de leur fonction de transfert thermique, les ailettes ou intercalaires doivent assurer une protection des tubes contre la perforation par effet galvanique, c'est-à- dire en prévoyant pour les ailettes un alliage présentant un potentiel électrochimique de corrosion plus faible que pour les tubes, de sorte que l'ailette joue le rôle d'anode sacrificielle. L'alliage le plus couramment utilisé pour les tubes étant l'alliage 3003, on utilise habituellement pour les ailettes un alliage du même type avec une addition de 0,5 à 2% de zinc. La composition de l'alliage 3003 enregistrée à l'AluminumAluminum alloys are now very widely used in the manufacture of heat exchangers for the automobile because of their low density, which allows a saving in weight, in particular compared to copper alloys, while ensuring a good thermal conduction, a ease of implementation and good corrosion resistance. These exchangers include 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 carried out either by mechanical assembly or by brazing. In addition to their heat transfer function, the fins or spacers must ensure protection of the tubes against perforation by galvanic effect, that is to say by providing for the fins an alloy having a lower electrochemical corrosion potential than for the tubes, so that the fin acts as a sacrificial anode. The most commonly used alloy for tubes being alloy 3003, an alloy of the same type is usually used for the fins with an addition 0.5 to 2% zinc. The composition of alloy 3003 recorded with Aluminum
Association est la suivante (% en poids) :Association is as follows (% by weight):
Si < 0,6 Fe < 0,7 Cu : 0,05 - 0,2_ Mn : 1,0 - 1,5 Zn < 0,l.If <0.6 Fe <0.7 Cu: 0.05 - 0.2_ Mn: 1.0 - 1.5 Zn <0.1.
Les bandes en ce type d'alliage sont généralement obtenues par coulée semi-continue d'une plaque, homogénéisation de cette plaque, laminage à chaud, puis laminage à froid avec éventuellement un recuit intermédiaire et/ou un recuit final. On peut également les obtenir par coulée continue de bandes entre deux courroies (« twin-belt casting ») ou entre deux cylindres refroidis (« twin-roll casting »). Il est connu qu'avec cette dernière technique, pour obtenir dans les alliages Al-Mn une structure à grains fins, on applique une homogénéisation de l'ébauche qui élimine les ségrégations issues de la coulée, ce qui conduit à un bon compromis entre la résistance mécanique et la formabilité. Ces propriétés sont décrites notamment dans le brevet EP 003921 1 (Alcan International) pour des alliages entre 1,3 et 2,3% de manganèse, et dans le brevet US 4,737,198 (Aluminum Company of America) pour des alliages contenant de 0,5 à 1,2% de fer, moins de 0,5% de silicium et de 0,7 àThe 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 possibly an intermediate annealing and / or a final annealing. They can also be obtained by continuous casting of bands between two belts ("twin-belt casting") or between two cooled cylinders ("twin-roll casting"). It is known that with this latter technique, in order to obtain a fine-grained structure in Al-Mn alloys, a homogenization of the blank is applied which eliminates the segregation resulting from casting, which leads to a good compromise between the mechanical strength and formability. These properties are described in particular in patent EP 003921 1 (Alcan International) for alloys between 1.3 and 2.3% of manganese, and in US patent 4,737,198 (Aluminum Company of America) for alloys containing 0.5 1.2% iron, less than 0.5% silicon and 0.7%
1,3% de manganèse, pouvant être utilisés pour la fabrication d'ailettes d'échangeurs. La demande de brevet WO 98/52707 de la demanderesse décrit un procédé de fabrication de bandes en alliage d'aluminium contenant l'un au moins des éléments Fe (de 0,15 à 1,5%) ou Mn (de 0,35 à 1,9%) avec Fe + Mn < 2,5%, et contenant éventuellement Si (< 0,8%), Mg (< 0,2%), Cu (< 0,2%), Cr (< 0,2%) ou Zn (< 0,2%) par coulée continue entre cylindres refroidis et frettés à une épaisseur comprise entre 1 et 5 mm, suivie d'un laminage à froid, l'effort appliqué aux cylindres de coulée, exprimé en tonnes par mètre de largeur de bande, étant inférieur à 300 + 2000/e, e étant l'épaisseur de la bande exprimée en mm. L'utilisation de ces bandes pour la fabrication d'ailettes d'échangeurs brasés est mentionnée.1.3% manganese, which can be used for the manufacture of exchanger fins. Patent application WO 98/52707 to the applicant describes a process for manufacturing aluminum alloy strips containing at least one of the elements Fe (from 0.15 to 1.5%) or Mn (from 0.35 at 1.9%) with Fe + Mn <2.5%, and possibly containing Si (<0.8%), Mg (<0.2%), Cu (<0.2%), Cr (<0 , 2%) or Zn (<0.2%) by continuous casting between cooled and shrunk cylinders to a thickness between 1 and 5 mm, followed by cold rolling, the force applied to the casting cylinders, expressed in tonnes per meter of strip width, being less than 300 + 2000 / e, e being the thickness of the strip expressed in mm. The use of these bands for the production of brazed exchanger fins is mentioned.
La demande de brevet WO 00/05426 d'Alcan International décrit la fabrication de bandes pour ailettes en alliage d'aluminium de composition : Fe : 1,-2 - 1,8%,Patent application WO 00/05426 of Alcan International describes the manufacture of strips for fins made of aluminum alloy of composition: Fe: 1, -2 - 1.8%,
Si : 0,7 - 0,95%, Mn : 0,3 - 0,5%, Zn : 0,3 - 2%, par coulée continue de bandes avec une vitesse de refroidissement supérieure à 10°C/s. Les demandes de brevet WO 01/53552 et WO 01/53553 d'Alcan International concernent également la fabrication de bandes pour ailettes en alliages au fer contenant jusqu'à 2,4% de fer par coulée continue et refroidissement très rapide. Le but est d'obtenir un potentiel de corrosion plus négatif. But de l'inventionSi: 0.7 - 0.95%, Mn: 0.3 - 0.5%, Zn: 0.3 - 2%, by continuous strip casting with a cooling rate greater than 10 ° C / s. Patent applications WO 01/53552 and WO 01/53553 of Alcan International also relate to the manufacture of strips for fins made of iron alloys containing up to 2.4% of iron by continuous casting and very rapid cooling. The aim is to obtain a more negative corrosion potential. Purpose of the invention
Si les ailettes ou intercalaires doivent jouer un rôle de protection galvanique des tubes, elles ne doivent pas cependant être trop détériorées par la corrosion au cours de la vie de l'échangeur. En effet, il faut maintenir une intégrité suffisante du matériau, car si celui-ci perfore trop rapidement, l'échange thermique sera moins efficace du fait de la perte de surface utile. Il pourrait même se produire une désolidarisation de l'ailette et du tube, ce qui bloquerait la conduction thermique entre ces composants. L'invention a ainsi pour but d'obtenir des bandes pour ailettes ou intercalaires d'échangeurs thermiques en alliage d'aluminium destinés notamment à l'industrie automobile, présentant à la fois une bonne résistance mécanique, une bonne formabilité et une bonne résistance à la corrosion perforante tout en ayant un rôle d'anode sacrificielle.If the fins or spacers must play a galvanic protection role 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 punctures too quickly, the heat exchange will be less effective due to the loss of useful surface. There could even be 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 aluminum alloy heat exchangers intended in particular for the automotive industry, having both good mechanical strength, good formability and good resistance to perforating corrosion while having the role of a sacrificial anode.
Objet de l'inventionSubject of the invention
L'invention a pour objet des bandes en alliage d'aluminium d'épaisseur < 0,3 mm, destinées à la fabrication d'échangeurs thermiques, de composition (% en poids) : Si < 1,5 Fe < 2,5 Cu < 0,8 Mg < l,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, autres éléments < 0,05 chacun et < 0,15 au total, reste aluminium, présentant entre la surface et la mi-épaisseur une différence de potentiel de corrosion, mesurée par rapport à une électrode au calomel saturé selon la norme ASTM G69, d'au moins 10 mV.The subject of the invention is strips of aluminum alloy 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, aluminum residue, having a difference in corrosion potential between the surface and the mid-thickness, measured with respect to a saturated calomel electrode according to ASTM G69, d '' at least 10 mV.
L'invention concerne également un procédé de fabrication de telles bandes par coulée continue dans des conditions favorisant la formation de ségrégations au cœur de la bande, éventuellement laminage à chaud, laminage à froid avec éventuellement un ou plusieurs recuit(s) intermédiaire(s) ou final de 1 à 20 h à une température comprise entre 200 et 450°C.The invention also relates to a method of manufacturing such strips by continuous casting under conditions favoring the formation of segregations at the heart of the strip, possibly hot rolling, cold rolling with possibly one or more intermediate annealing (s). or final from 1 to 20 h at a temperature between 200 and 450 ° C.
Description des figures La figure 1 représente l'évolution du potentiel de corrosion, mesuré par rapport à une électrode au calomel saturé, d'une bande selon l'invention en alliage de l'exemple 1, en fonction de la profondeur par rapport à la surface.Description of the figures FIG. 1 represents the evolution of the corrosion potential, measured with respect to a saturated calomel electrode, of a strip according to the invention of the alloy of example 1, as a function of the depth with respect to the surface.
La figure 2 représente de la même manière l'évolution du potentiel de corrosion d'une bande en alliage de l'exemple 2.FIG. 2 likewise represents the evolution of the corrosion potential of an alloy strip from Example 2.
Description de l'inventionDescription of the invention
La demanderesse a trouvé qu'en utilisant, pour des alliages de type 3000 (Al-Mn) ou de type 8000 (Al-Fe) avec addition éventuelle de zinc, la coulée continue dans des conditions de coulée particulières et avec une gamme de transformation adaptée, on obtenait des bandes présentant un gradient de potentiel de corrosion dans leur épaisseur, et que cette propriété favorisait une propagation latérale plutôt que perpendiculaire à la surface de la corrosion, ce qui assurait l'effet sacrificiel tout en évitant la perforation, et donc la détérioration de l'ailette ou de l'intercalaire au cours du temps. Ce gradient de potentiel est d'au moins 10 mV. Selon une hypothèse émise par les inventeurs, cette différence pourrait être liée à la présence, pour les conditions particulières de coulée sélectionnées, de ségrégations au centre de la bande, phénomène qu'on cherche habituellement à éviter, et qui conduit à des différences de composition en solution solide dans l'épaisseur des bandes.The Applicant has found that by using, for alloys of type 3000 (Al-Mn) or of type 8000 (Al-Fe) with possible addition of zinc, the casting continues under specific casting conditions and with a transformation range suitable, we obtained strips with a corrosion potential gradient in their thickness, and that this property favored lateral propagation rather than perpendicular to the corrosion surface, which ensured the sacrificial effect while avoiding perforation, and therefore deterioration of the fin or the interlayer over time. This potential gradient is at least 10 mV. According to a hypothesis put forward by the inventors, this difference could be linked to the presence, for the particular casting conditions selected, of segregations at the center of the strip, a phenomenon that is usually sought to avoid, and which leads to differences in composition. in solid solution in the thickness of the strips.
La teneur en zinc varie en fonction de l'alliage utilisé pour les tubes, de manière à obtenir une différence de potentiel électrochimique entre les tubes et les ailettes à la fois suffisante pour permettre à l'ailette d'assurer son rôle d'anode sacrificielle, et pas trop élevée pour éviter sa détérioration trop rapide. Pour abaisser le potentiel de corrosion de l'ailette ou intercalaire, on peut ajouter également de l'indium, de l'étain et/ou du bismuth jusqu'à une teneur de 0,2%. Pour des tubes en alliage 3003, la teneur en zinc est comprise, de préférence, entre 1,0 et 1,5%. Pour des tubes en alliage Al-Mn p s chargé en cuivre, comme par exemple les alliages à plus de 0,4%> de cuivre décrits dans la demande de brevet EP 1075935 de la demanderesse, la teneur en zinc doit plutôt être maintenue en dessous de 0,8%.The zinc content varies depending on the alloy used for the tubes, so as to obtain a difference in electrochemical potential between the tubes and the fins that is sufficient to allow the fin to fulfill its role as a sacrificial anode. , and not too high to avoid too rapid deterioration. To lower the corrosion potential of the fin or interlayer, indium, tin and / or bismuth can also be added up to a content of 0.2%. For 3003 alloy tubes, the zinc content is preferably between 1.0 and 1.5%. For tubes of Al-Mn ps alloy loaded with copper, such as for example the alloys with more than 0.4%> of copper described in patent application EP 1075935 of the applicant, the zinc content must rather be kept below 0.8%.
La teneur en cuivre est maintenue de préférence en dessous de 0,5%o. L'addition éventuelle de titane jusqu'à 0,2%, de zirconium jusqu'à 0,25% et/ou de chrome jusqu'à 0,25% permet d'améliorer la tenue à chaud (« SAG résistance ») de l'alliage. Dans une première variante de l'invention, l'alliage utilisé est un alliage du typeThe copper content is preferably kept below 0.5% o. The possible 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 ("resistance SAG") of the alloy. In a first variant of the invention, the alloy used is an alloy of the type
3003 avec une teneur en zinc pouvant aller jusqu'à 2%, c'est-à-dire un alliage de composition (% en poids) :3003 with a zinc content of up to 2%, that is to say an alloy of composition (% by weight):
Si < 1,0 Fe < l,0 Cu < 0,8 Mg < l,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 autres éléments < 0,05 chacun et < 0,15 au total, reste aluminium.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, aluminum remains.
L'addition de silicium, de préférence au-delà de 0,5% et jusqu'à 1% contribue à augmenter l'intervalle de solidification de l'alliage, ce qui favorise l'apparition de ségrégations à la coulée. Au-delà de 1%, on risque d'atteindre la température de brûlure de l'alliage au cours de l'opération de brasage de l'échangeur.The addition of silicon, preferably beyond 0.5% and up to 1% contributes to increasing the solidification interval of the alloy, which promotes the appearance of segregation during casting. Above 1%, there is a risk of reaching the burning temperature of the alloy during the brazing operation of the exchanger.
Dans une seconde variante de l'invention, on utilise un alliage de la série 8000 de composition (% en poids) :In a second variant of the invention, an alloy of the 8000 series of composition (% by weight) is used:
Si : 0,2 - 1,5 Fe : 0,2 - 2,5 Cu < 0,8 Mg < l,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 Si + Fe > 0,8, autres éléments < 0,05 chacun et < 0,15 au total, reste aluminium.Si: 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 Si + Fe> 0.8, other elements <0.05 each and <0.15 in total, remains aluminum.
Un domaine de composition particulièrement adapté est le suivant : Si : 0,8 - 1,5 Fe : 0,7 - 1,3 Mn < 0,1 Cu < 0,1 Mg < 0,1 et, de préférence, Si : 1,0 - 1,3 et Fe : 0,9 - 1,2.A particularly suitable composition range is as follows: Si: 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.
Le procédé de fabrication des bandes selon l'invention comprend l'élaboration de l'alliage à partir d'une charge ajustée pour obtenir la composition d'alliage désirée. Le métal est ensuite coulé en continu sous forme d'une bande d'épaisseur comprise entre 1 et 30 mm, soit par coulée entre courroies entre 12 et 30 mm, soit, de préférence, par coulée entre deux cylindres refroidis et frettés, à une épaisseur comprise entre 1 et 12 mm. Contrairement à l'enseignement de la demande de brevet WO 98/52707, on choisit des paramètres de coulée favorisant l'apparition de ségrégations relativement importantes au cœur de la bande coulée. Dans le cas de la coulée entre cylindres, il faut pour cela que le contact entre le métal et les cylindres refroidis soit le meilleur possible, de manière à augmenter le gradient thermique à la surface du métal durant la coulée, ce qui favorise les ségrégations. Les différents paramètres sur lesquels on peut agir sont notamment la longueur de l'arc de contact entre le métal et les cylindres, l'effort exercé par les cylindres au cours de la coulée et la température des frettes des cylindres. Un arc de contact élevé, de préférence supérieur à 60 mm, est favorable à la formation de ségrégations. Il en est de même d'un effort élevé, de préférence supérieur à 100 + 2000/e t/m de largeur de bande coulée, e étant l'épaisseur de la bande coulée exprimée en mm. Enfin, la température des frettes doit être aussi faible que possible, de préférence inférieure à 100°C. La bande coulée est éventuellement, dans le cas de la coulée entre courroies, laminée à chaud, et ensuite laminée à froid. Par contre, la bande coulée entre cylindres est directement laminée à froid. Si l'épaisseur finale est assez faible, il est nécessaire de prévoir au moins un recuit intermédiaire à une température comprise entre 200 et 450°C. Si le métal doit être livré à l'état recuit, on procède, sur la bande laminée jusqu'à l'épaisseur finale, à un recuit à une température comprise entre 200 et 450°C. Dans le cas où le métal est livré à l'état écroui, la gamme de transformation est adaptée de façon à ce que le taux de réduction soit ajusté au taux d'écrouissage visé. Les bandes selon l'invention permettent de réaliser des ailettes ou intercalaires d'échangeurs thermiques présentant une résistance mécanique élevée, ce qui permet de diminuer l'épaisseur par rapport à une ailette ou un intercalaire selon l'art antérieur, tout en gardant une bonne formabilité. En service, l'ailette ou l'intercalaire joue son rôle sacrificiel, mais la corrosion progresse latéralement parallèlement à la surface, ce qui évite ou retarde la perforation, assure l'intégrité de l'assemblage tube- ailette, et donc un échange thermique continu. Les bandes présentent une microstructure à grains grossiers, favorable à la tenue à chaud au cours du brasage.The method of manufacturing the strips according to the invention comprises the development of the alloy from a charge adjusted 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 cooled and hooped cylinders, at a thickness between 1 and 12 mm. Contrary to the teaching of patent application WO 98/52707, casting parameters are chosen which favor the appearance of relatively large segregations at the heart of the cast strip. In the case of casting between rolls, this requires that the contact between the metal and the cooled rolls is the best possible, so as to increase the thermal gradient at 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 cylinders during casting and the temperature of the frets of the cylinders. A high contact arc, preferably greater than 60 mm, is favorable for the formation of segregations. It is likewise a high effort, preferably greater than 100 + 2000 / and / m of width of the cast strip, e being the thickness of the cast strip expressed in mm. Finally, the temperature of the frets must be as low as possible, preferably less than 100 ° C. The casting strip is optionally, in the case of casting between belts, hot rolled, and then cold rolled. On the other hand, the strip cast between cylinders is directly cold rolled. If the final thickness is small enough, it is necessary to provide at least one intermediate annealing at a temperature between 200 and 450 ° C. If the metal is to be delivered in the annealed condition, the laminated strip is annealed at a temperature between 200 and 450 ° C. In the case where the metal is delivered in the work hardened state, the transformation range is adapted so that the reduction rate is adjusted to the target work hardening rate. The strips according to the invention make it possible to produce fins or spacers of heat exchangers having a high mechanical strength, which makes it possible to reduce the thickness compared to a fin or a spacer according to the prior art, while keeping good formability. In use, the fin or the 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, which is favorable to heat resistance during brazing.
ExempleExample
Exemple 1Example 1
On a préparé au four de fusion un alliage de composition (% en poids)An alloy of composition (% by weight) was prepared in the melting furnace
On a coulé une bande d'épaisseur 5 mm sur une installation de coulée continue Jumbo 3Cm ™ de la société Pechiney Rhenalu, à une largeur de 1420 mm, avec un effort entre les cylindres de 780 1, un arc de contact de 70 mm et une température des frettes des cylindres de 70°C. La bande a été ensuite laminée à froid en une passe jusqu'à l'épaisseur 0,7 mm, puis soumise à un recuit intermédiaire de 12 h dans un four à air programmé à 520°C pour amener le métal à une température de l'ordre de 380°C, et laminée à froid en trois passes jusqu'à 130 μm.A 5 mm thick strip was cast on a Jumbo 3Cm ™ continuous casting installation from the company Pechiney Rhenalu, at a width of 1420 mm, with a force between the cylinders of 780 1, a contact arc of 70 mm and a temperature of cylinder frets of 70 ° C. The strip was then cold rolled in one pass to the thickness 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 l '' 380 ° C, and cold rolled in three passes up to 130 μm.
Une première partie de la bande a subi un recuit de restauration de 2 h à 350°C, puis un laminage jusqu'à 100 μm. Une seconde partie a subi un recuit de recristallisation de 2 h à 400°C, puis un laminage jusqu'à 100 μm. Enfin, une troisième partie a subi le même recuit, mais un laminage jusqu'à 75 μm. Pour comparaison, on a fabriqué des bandes en alliage 3003 au zinc de composition :The first part of the strip underwent a restorative annealing of 2 h at 350 ° C, then a rolling up to 100 μm. A second part underwent a recrystallization annealing of 2 h at 400 ° C, then a rolling up to 100 μm. Finally, a third part underwent the same annealing, but rolling up to 75 μm. For comparison, strips of alloy 3003 with zinc of composition were manufactured:
selon la même gamme de fabrication, mais en partant d'un procédé de coulée semi- continue verticale, avec un recuit de restauration de 2 h à 350°C, et un laminage jusqu'à 100 μm.according to the same production range, but starting from a semi-continuous vertical casting process, with a restorative annealing of 2 h at 350 ° C, and a rolling up to 100 μm.
On a mesuré sur ces bandes les caractéristiques mécaniques statiques : limite d'élasticité R0>2, résistance à la rupture Rm et allongement A. Les résultats sont indiqués au tableau 1 :The static mechanical characteristics were measured on these bands: elastic limit R 0> 2 , tensile strength R m and elongation A. The results are shown in Table 1:
* CC = coulée continue CV = coulée semi-continue verticale* CC = continuous casting CV = semi-continuous vertical casting
On constate que le métal obtenu par coulée continue présente à la fois une meilleure résistance mécanique et un meilleur allongement que le métal issu de coulée traditionnelle.It is found that the metal obtained by continuous casting has both better mechanical strength and better elongation than the metal obtained from traditional casting.
Sur la bande d'épaisseur 75 μm, on a mesuré, par rapport à une électrode au calomel saturé selon la norme ASTM G69, l'évolution du potentiel de corrosion dans l'épaisseur. On constate sur la figure la présence, sous la surface, et sur une profondeur d'environ 15 μm, d'une zone dans laquelle le potentiel évolue rapidement de -890 mV à -870 mV.On the 75 μm thick strip, the evolution of the corrosion potential in the thickness was measured, relative to a saturated calomel electrode according to the ASTM G69 standard. We can see in the figure the presence, below the surface, and on a depth of about 15 μm, of an area in which the potential evolves rapidly from -890 mV to -870 mV.
Exemple 2Example 2
On a préparé un alliage de composition (% en poids)An alloy of composition was prepared (% by weight)
On a coulé une bande d'épaisseur 6,1 mm sur une installation de coulée continue Davy ™ de la société Pechiney Eurofoil, à une largeur de 1740 mm, avec un effort entre les cylindres de 550 t, un arc de contact de 60 mm et une température des frettes des cylindres de 42°C. La bande a été ensuite laminée à froid jusqu'à l'épaisseur de 80 μm, pour obtenir un état métallurgique de type H19. Les caractéristiques mécaniques de cette bande sont les suivantes :A 6.1 mm thick strip was cast on a Davy ™ continuous casting installation from the company Pechiney Eurofoil, at a width of 1740 mm, with a force between the cylinders of 550 t, a contact arc of 60 mm and a temperature of the frets of the cylinders of 42 ° C. The strip was then cold rolled to the thickness of 80 μm, to obtain an H19 type metallurgical state. The mechanical characteristics of this strip are as follows:
On constate que ce métal, produit par coulée continue, présente un excellent compromis résistance mécanique / allongement.It is found that this metal, produced by continuous casting, has an excellent compromise between mechanical strength and elongation.
On a ensuite appliqué au métal, dans un four sous atmosphère d'azote, un cycle de brasage typique, comportant un palier de 2 minutes à 600°C.A typical brazing cycle was then applied to the metal, in an oven under a nitrogen atmosphere, comprising a 2-minute plateau at 600 ° C.
Les caractéristiques mécaniques obtenues après ce traitement sont les suivantes :The mechanical characteristics obtained after this treatment are as follows:
La limite élastique après brasage, R0 , égale à 53 MPa est significativement supérieure à celle obtenue pour des bandes en alliage 3003 traditionnellement utilisé, obtenues par coulée classique (de l'ordre de 40-45 MPa). Du point de vue de la résistance à la corrosion, on retrouve sur ces alliages 8xxx, comme on peut le voir à la figure 2, et toujours en liaison avec le procédé de coulée utilisé, une évolution du potentiel de corrosion dans l'épaisseur du métal, dont le caractère bénéfique a été explicité plus haut pour les alliages 3xxx.The elastic limit after brazing, R 0 , equal to 53 MPa is significantly higher than that obtained for strips of alloy 3003 traditionally used, obtained by conventional casting (of the order of 40-45 MPa). From the point of view of corrosion resistance, we find on these alloys 8xxx, as we can see in Figure 2, and always in connection with the casting process used, an evolution of the corrosion potential in the thickness of the metal, the beneficial nature of which was explained above for 3xxx alloys.
Afin d'adapter le potentiel de corrosion à celui des alliages utilisés pour les tubes auxquels les intercalaires vont être couplés, il est possible de réaliser une addition de zinc, élément qui n'a que très peu d'influence sur les caractéristiques mécaniques ou la conductivité thermique. In order to adapt the corrosion potential to that of the alloys used for the tubes to which the spacers are to be coupled, it is possible to carry out an addition of zinc, an element which has very little influence on the mechanical characteristics or the thermal conductivity.

Claims

Revendications claims
1. Bandes en alliage d'aluminium d'épaisseur < 0,3 mm, destinées à la fabrication d'échangeurs thermiques brasés, de composition (% en poids) :1. Aluminum alloy strips of thickness <0.3 mm, intended for the manufacture of brazed heat exchangers, composition (% by weight):
Si < 1,5 Fe < 2,5 Cu < 0,8 Mg < l,0 Mn < l,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, autres éléments < 0,05 chacun et < 0,15 au total, présentant entre la surface et la mi-épaisseur une différence de potentiel de corrosion, mesurée par rapport à une électrode au calomel saturé selon la norme ASTM G69, d'au moins 10 mV.Si <1,5 Fe <2,5 Cu <0,8 Mg <l, 0 Mn <l, 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, exhibiting a difference in corrosion potential between the surface and the mid-thickness, measured with respect to a saturated calomel electrode according to ASTM G69, at least 10 mV.
2. Bandes selon la revendication 1, caractérisées en ce que la teneur en zinc est comprise entre 1 ,0 et 1 ,5%.2. Strips according to claim 1, characterized in that the zinc content is between 1.0 and 1.5%.
3. Bandes selon la revendication 1, caractérisées en ce que la teneur en zinc est inférieure à 0,8%.3. Strips according to claim 1, characterized in that the zinc content is less than 0.8%.
4. Bandes selon l'une des revendications 1 à 3, caractérisées en ce que la teneur en cuivre est inférieure à 0,5%.4. Strips according to one of claims 1 to 3, characterized in that the copper content is less than 0.5%.
5. Bandes selon l'une des revendications 1 à 4, caractérisées en ce qu'elles sont en alliage de composition : Si < 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, autres éléments < 0,05 chacun et < 0,15 au total, reste aluminium.5. Strips according to one of claims 1 to 4, characterized in that they are an alloy of composition: Si <1.0 Fe <1.0 Cu 0 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, aluminum remains.
6. Bandes selon la revendication 5, caractérisées en ce que la teneur en silicium est comprise entre 0,5 et 1%.6. Strips according to claim 5, characterized in that the silicon content is between 0.5 and 1%.
7. Bandes selon l'une des revendications 1 à 4, caractérisées en ce qu'elles sont en alliage de composition : Si : 0,2 - 1,5 Fe : 0,2 - 2,5 Cu < 0,8 Mg < 1,07. Strips according to one of claims 1 to 4, characterized in that they are an alloy of composition: Si: 0.2 - 1.5 Fe: 0.2 - 2.5 Cu <0.8 Mg < 1.0
Mn : < l,0 Zn < 2,0 In < 0.2 Sn < 0.2 Bi < 0.2 Ti < 0.2 Cr < 0.25Mn: <1.0 Zn <2.0 In <0.2 Sn <0.2 Bi <0.2 Ti <0.2 Cr <0.25
Zr < 0.25 Si + Fe > 0,8, autres éléments < 0,05 chacun et < 0,15 au total, reste aluminium. Zr <0.25 Si + Fe> 0.8, other elements <0.05 each and <0.15 in total, remains aluminum.
8. Bandes selon la revendication 7, caractérisées en ce qu'elles sont en alliage contenant : Si : 0,8 - 1,5 Fe : 0,7 - 1,3 Mn < 0,l Cu < 0,l Mg < 0,l .8. Strips according to Claim 7, characterized in that they are made of an alloy containing: Si: 0.8 - 1.5 Fe: 0.7 - 1.3 Mn <0.1, Cu <0.1, l Mg <0 , l.
9. Bandes selon la revendication 8, caractérisées en ce que la teneur en silicium de l'alliage est comprise entre 1 et 1,3%9. Strips according to claim 8, characterized in that the silicon content of the alloy is between 1 and 1.3%
10. Bandes selon l'une des revendications 8 ou 9, caractérisées en ce que la teneur en fer est comprise entre 0,9 et 1,2%.10. Strips according to one of claims 8 or 9, characterized in that the iron content is between 0.9 and 1.2%.
1 1. Procédé de fabrication de bandes selon l'une des revendications 1 à 10, par coulée continue à une épaisseur comprise entre 1 et 30 mm dans des conditions favorisant la formation de ségrégations au cœur de la bande coulée, éventuellement laminage à chaud, laminage à froid avec éventuellement un ou plusieurs recuit(s) intermédiaire(s) ou final de 1 à 20 h à une température comprise entre 200 et 450°C.1 1. A method of manufacturing strips according to one of claims 1 to 10, by continuous casting to a thickness between 1 and 30 mm under conditions favoring the formation of segregations at the heart of the cast strip, optionally hot rolling, cold rolling with optionally one or more intermediate or final annealing for 1 to 20 hours at a temperature between 200 and 450 ° C.
12. Procédé selon la revendication 11, caractérisé en ce que la coulée continue est une coulée entre deux cylindres refroidis et frettes.12. Method according to claim 11, characterized in that the continuous casting is a casting between two cooled cylinders and hoops.
13. Procédé selon la revendication 12, caractérisé en ce que l'effort exercé par les cylindres à la coulée est supérieur à 100 + 2000/e t/m de largeur de bande coulée, e étant l'épaisseur de la bande coulée en mm.13. Method according to claim 12, characterized in that the force exerted by the cylinders in the casting is greater than 100 + 2000 / e t / m of width of the casting strip, e being the thickness of the casting strip in mm.
14. Procédé selon l'une des revendications 12 ou 13, caractérisé en ce que l'arc de contact entre le métal et les cylindres est supérieur à 60 mm.14. Method according to one of claims 12 or 13, characterized in that the contact arc between the metal and the cylinders is greater than 60 mm.
15. Procédé selon l'une des revendications 12 à 14, caractérisé en ce que la température des frettes est inférieure à 100°C. 15. Method according to one of claims 12 to 14, characterized in that the temperature of the hoops is less than 100 ° C.
EP02790555A 2001-11-19 2002-11-12 Aluminium alloy strips for heat exchangers Expired - Lifetime EP1446511B1 (en)

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FR0114948 2001-11-19
PCT/FR2002/003866 WO2003044235A2 (en) 2001-11-19 2002-11-12 Aluminium alloy strips for heat exchangers

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JP2005509750A (en) 2005-04-14
WO2003044235A3 (en) 2003-12-04
FR2832497B1 (en) 2004-05-07
US20050034793A1 (en) 2005-02-17
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ES2263841T3 (en) 2006-12-16
US20060260723A1 (en) 2006-11-23
US7811394B2 (en) 2010-10-12
CA2467681C (en) 2010-04-20
DE60211011T2 (en) 2006-11-30
WO2003044235A2 (en) 2003-05-30
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CA2467681A1 (en) 2003-05-30
AU2002365952A1 (en) 2003-06-10

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