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EP1349965A2 - Rolled or extruded aluminium al-mn alloy products with improved corrosion resistance - Google Patents

Rolled or extruded aluminium al-mn alloy products with improved corrosion resistance

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Publication number
EP1349965A2
EP1349965A2 EP02700316A EP02700316A EP1349965A2 EP 1349965 A2 EP1349965 A2 EP 1349965A2 EP 02700316 A EP02700316 A EP 02700316A EP 02700316 A EP02700316 A EP 02700316A EP 1349965 A2 EP1349965 A2 EP 1349965A2
Authority
EP
European Patent Office
Prior art keywords
tube
product according
temperature
less
corrosion resistance
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
EP02700316A
Other languages
German (de)
French (fr)
Other versions
EP1349965B1 (en
Inventor
Bruce Morere
Isabelle Ronga
Jean-Louis Querbes
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
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 Pechiney Rhenalu SAS filed Critical Pechiney Rhenalu SAS
Publication of EP1349965A2 publication Critical patent/EP1349965A2/en
Application granted granted Critical
Publication of EP1349965B1 publication Critical patent/EP1349965B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • the invention relates to laminated or extruded products of Al-Mn aluminum alloy (3000 series according to the nomenclature of the Aluminum Association) with improved corrosion resistance, in particular tubes intended in particular for pipes or tubes and strips. intended for heat exchangers for the automobile industry.
  • the alloys usually used for tubes intended for automobile pipes and for tubes and bands intended for automobile heat exchangers assembled mechanically are manganese alloys 3102, 3003 or 3103 according to standard EN 573-3. These alloys have good spinning properties and satisfactory mechanical characteristics. However, it appeared necessary to improve the corrosion resistance for these applications, which led to the appearance of alloys qualified as "long life”.
  • Patent application WO 97/46726 to Reynolds Metals relates to an alloy, known under the designation X3030, of composition (%> by weight): Mn: 0.1 - 0.5 Cu ⁇ 0.03 Mg ⁇ 0.01 Zn : 0.06 - 1.0 Si: 0.05 - 0.12 Fe ⁇ 0.50 Ti: 0.03 - 0.30 Cr ⁇ 0.50 remains aluminum.
  • the addition of Zn and Ti contributes to the improvement of the corrosion resistance.
  • Cr is preferably kept below 0.20% and the examples show contents of 0.005%, 0.05% and 0.10%.
  • Fe is preferably kept below 0.30%, and the examples show contents of 0.10%, 0.12% and 0.20%.
  • Patent application WO 99/18250 from the same company relates to an alloy designated X3020 having better formability than X3030 by adding Mg (up to 1%) and Zr (up to 0.30%). Cr is preferably kept below 0.02% o, or even 0.01%). Fe is preferably kept below 0.30%).
  • Patent application WO 00/50656 from Norsk Hydro relates to an alloy of composition: Si: 0.05 - 0.15 Fe: 0.06 - 0.35 Cu ⁇ 0.10 Mn: 0.01 - 1, 0
  • Cr is preferably kept below 0.15% and is only allowed for the purpose of recycling scrap from the manufacture of other alloys.
  • Fe is preferably kept below 0.22% ”.
  • the object of the invention is to further improve the corrosion resistance compared to existing “long life” alloys.
  • the subject of the invention is a rolled or extruded product, in particular a tube, made of an alloy of composition (% by weight):
  • the preferred contents are: Si ⁇ 0.15 Fe: 0.25 - 0.40 Mn: 0.8 - 1.0 Cr: 0.15 - 0.30 Zn: 0.10 - 0.25
  • the invention also relates to a method of manufacturing spun tubes of this composition comprising the casting of a billet of the preceding composition, optionally the homogenization of this billet, the spinning of a tube, the drawing of this tube in one or more passes and continuous annealing at a temperature between 350 and 500 ° C with a rise in temperature of less than 10 seconds, and preferably less than 2 seconds.
  • the subject of the invention is also a process for manufacturing strips of this composition, comprising the casting of a plate, its hot rolling, then cold rolling, and continuous annealing at a temperature between 350 and 500 ° C. with a rise in temperature of less than 10 minutes, and preferably less than 2 minutes.
  • the alloy according to the invention has a manganese content of the same order as that of alloys 3003 or 3103 and contains practically no copper or magnesium. Unlike the teaching of the prior art which recommends low iron contents for corrosion resistance, the alloy exhibits good behavior with an iron content greater than 0.20%> and up to
  • a chromium content greater than 0.10%, and preferably 0.15% has been found to favor corrosion resistance.
  • the process for manufacturing spun products involves the casting of billets of the indicated alloy, the homogenization of the billets, their reheating and their spinning to obtain a tube in straight length or in a crown, and one or more passes stretching to bring the product to the desired dimensions.
  • the tube is then annealed by high-speed scrolling in a pass-through oven, preferably an induction oven.
  • the reheating of the spun product is very rapid, less than 10 seconds, and preferably 2 seconds, and the product runs at a speed of between 20 and 200 m / min.
  • the oven temperature is maintained between
  • the product can then be re-stretched to increase the mechanical strength.
  • This continuous annealing leads to a microstructure with fine equiaxed grains, of an average grain size, measured by the intercepts method, less than 40 ⁇ m, and typically of the order of 30 ⁇ m, whereas with a conventional annealing in in a static oven, the grains are elongated with a much larger grain size, of the order of 180 ⁇ m in the spinning direction and 70 ⁇ m in the direction perpendicular to the spinning.
  • the presence of chromium further tends to decrease the grain size by increasing the density of the recrystallization sites, which has a beneficial effect on the corrosion resistance.
  • the strip manufacturing process includes the casting of a plate of the composition according to the invention, optionally the homogenization of this plate, the hot rolling of this plate to obtain a strip, the cold rolling of this strip up to to the desired thickness and a final recrystallization annealing at a temperature between 350 and 600 ° C.
  • This final annealing is preferably done in continuous in a passage oven with a temperature rise of less than 10 minutes, and preferably less than 2 minutes, which leads to a fine grain size.
  • the hot rolled strip can also be obtained directly by continuous casting, for example by casting between two cooled rolls.
  • the products according to the invention have a better corrosion resistance than 3003 or 3103, and at least as good as the “long life” alloys of the prior art, mechanical characteristics and formability equivalent to 3003 or 3103 , and an economic development cost. They have an electrochemical corrosion potential practically identical to that of 3003 or 3103, so that there is no difference in behavior of the galvanic couples, for example the tube-fin pair of the heat exchangers.
  • the spun products also have a spinning ability at least as good as that of alloys 3003 or 3103.
  • the spun products according to the invention can be used in particular as fuel, oil or brake fluid line pipes for cars and as tubes intended for heat exchangers of engine cooling and passenger compartment air conditioning systems of motor vehicles.
  • the strips can be used in the same exchangers for manifolds, evaporators or fins.
  • the alloys A, B and C correspond to compositions of 3003, 3103 and X3020 of the prior art.
  • the alloys D and E differ from the composition according to the invention by a lower iron for D and titanium in place of the chromium for E.
  • the alloy F is in accordance with the invention.
  • the compositions of the alloys (% by weight) are indicated in Table 1. Table 1
  • the billets were spun into tube crowns and then stretched to obtain a diameter of 12 mm and a thickness of 1.25 mm. No significant difference was recorded for the 6 alloys concerning their suitability for spinning or drawing.
  • These crowns were continuously annealed in an induction furnace at a temperature set at 470 ° C, with a passage speed between 60 and 120 m / min. The crowns were then subjected to a new drawing pass to bring them to the H12 state according to standard EN 515.
  • the tensile strength R m (in MPa) and the limit were measured on samples of the 6 tubes.
  • the alloy according to the invention leads to a mechanical resistance practically identical to that of 3003 (A) or 3103 (B).
  • the corrosion resistance was measured using the SWAAT test (knows water acetic acid test) according to standard ASTM G85. The measurements were made for 3 cycle durations: 100, 400 and 800 cycles, on two tubes per alloy and per duration of length 200 mm. At the end of the test, the tubes are taken out of the enclosure and pickled in a 68% concentrated nitric acid solution to dissolve corrosion products. On each tube, the deeper and the average is calculated is then measured depth of 5 injections to each tube and the average P avg values obtained for the two tubes. The corrosion resistance is all the better when P avg is low. The results are shown in Table 3.
  • alloy F according to the invention is the one which gives the best results, and therefore the iron content of 0.21% does not harm the corrosion resistance, and the addition of 0.20%) of chromium for alloys D and F has a clearly beneficial effect.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Of Metal (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Heat Treatment Of Steel (AREA)
  • Powder Metallurgy (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention concerns a rolled or extructed product, in particular a tube, made of an alloy composition (expressed in wt. %) comprising: Si<0.30; Fe 0.20-0.05; Cu<0.05; Mn 0.5-1.2; Mg<0.05; Zn<0.50; Cr 0.10-0.30; Ti<0.05; Zr<0.05; the balance consisting of aluminium and unavoidable impurities. The invention also concerns a method for making extruded tubes of said composition comprising casting a billet, optionally homogenizing it, extruding a tube, drawing said tube in one or several passes and continuous annealing at a temperature ranging between 350 and 500° C. with a temperature increase of less than 10 seconds. The inventive products are designed for pipes and heat exchangers for motor vehicles, and exhibit good corrosion resistance.

Description

Produits laminés ou filés en alliage d'aluminium Al-Mn à résistance à la corrosion améliorée. Rolled or extruded products of Al-Mn aluminum alloy with improved corrosion resistance.
Domaine de l'inventionField of the invention
L'invention concerne des produits laminés ou filés en alliage d'aluminium Al-Mn (série 3000 selon la nomenclature de l'Aluminum Association) à résistance à la corrosion améliorée, en particulier des tubes destinés notamment à des canalisations ou des tubes et bandes destinés à des échangeurs thermiques pour la construction automobile.The invention relates to laminated or extruded products of Al-Mn aluminum alloy (3000 series according to the nomenclature of the Aluminum Association) with improved corrosion resistance, in particular tubes intended in particular for pipes or tubes and strips. intended for heat exchangers for the automobile industry.
Etat de la techniqueState of the art
Les alliages habituellement utilisés pour les tubes destinés aux canalisations pour l'automobile et pour les tubes et bandes destinés aux échangeurs thermiques d'automobiles assemblés par voie mécanique sont les alliages au manganèse 3102, 3003 ou 3103 selon la norme EN 573-3. Ces alliages présentent une bonne aptitude au filage et des caractéristiques mécaniques satisfaisantes. Cependant, il est apparu nécessaire d'améliorer la résistance à la corrosion pour ces applications, ce qui a entraîné l'apparition d'alliages qualifiés de « long life ».The alloys usually used for tubes intended for automobile pipes and for tubes and bands intended for automobile heat exchangers assembled mechanically are manganese alloys 3102, 3003 or 3103 according to standard EN 573-3. These alloys have good spinning properties and satisfactory mechanical characteristics. However, it appeared necessary to improve the corrosion resistance for these applications, which led to the appearance of alloys qualified as "long life".
La demande de brevet WO 97/46726 de Reynolds Metals concerne un alliage, connu sous la désignation X3030, de composition (%> en poids) : Mn : 0,1 - 0,5 Cu < 0,03 Mg < 0,01 Zn : 0,06 - 1,0 Si : 0,05 - 0,12 Fe < 0,50 Ti : 0,03 - 0,30 Cr < 0,50 reste aluminium. L'addition de Zn et de Ti contribue à l'amélioration de la résistance à la corrosion. Cr est maintenu de préférence en dessous de 0,20% et les exemples montrent des teneurs de 0,005%, 0,05% et 0,10%. Fe est maintenu de préférence en dessous de 0,30%, et les exemples montrent des teneurs de 0,10%, 0,12% et 0,20%. La demande de brevet WO 99/18250 de la même société concerne un alliage désigné X3020 présentant une meilleure formabilité que le X3030 par addition de Mg (jusqu'à 1%) et de Zr (jusqu'à 0,30%). Cr est maintenu de préférence en dessous de 0,02%o, voire de 0,01%). Fe est maintenu de préférence en dessous de 0,30%). La demande de brevet WO 00/50656 de Norsk Hydro est relative à un alliage de composition : Si : 0,05 - 0,15 Fe : 0,06 - 0,35 Cu < 0,10 Mn : 0,01 - 1,0Patent application WO 97/46726 to Reynolds Metals relates to an alloy, known under the designation X3030, of composition (%> by weight): Mn: 0.1 - 0.5 Cu <0.03 Mg <0.01 Zn : 0.06 - 1.0 Si: 0.05 - 0.12 Fe <0.50 Ti: 0.03 - 0.30 Cr <0.50 remains aluminum. The addition of Zn and Ti contributes to the improvement of the corrosion resistance. Cr is preferably kept below 0.20% and the examples show contents of 0.005%, 0.05% and 0.10%. Fe is preferably kept below 0.30%, and the examples show contents of 0.10%, 0.12% and 0.20%. Patent application WO 99/18250 from the same company relates to an alloy designated X3020 having better formability than X3030 by adding Mg (up to 1%) and Zr (up to 0.30%). Cr is preferably kept below 0.02% o, or even 0.01%). Fe is preferably kept below 0.30%). Patent application WO 00/50656 from Norsk Hydro relates to an alloy of composition: Si: 0.05 - 0.15 Fe: 0.06 - 0.35 Cu <0.10 Mn: 0.01 - 1, 0
Mg : 0,02 - 0,60 Cr < 0,25 Zn : 0,05 - 0,70 Ti < 0,25 Zr < 0,20Mg: 0.02 - 0.60 Cr <0.25 Zn: 0.05 - 0.70 Ti <0.25 Zr <0.20
Cr est maintenu de préférence en dessous de 0,15% et n'est admis que pour des raisons de recyclage de chutes de fabrication d'autres alliages. Fe est maintenu de préférence en dessous de 0,22%».Cr is preferably kept below 0.15% and is only allowed for the purpose of recycling scrap from the manufacture of other alloys. Fe is preferably kept below 0.22% ”.
Objet de l'inventionSubject of the invention
Le but de l'invention est d'améliorer encore la résistance à la corrosion par rapport aux alliages « long life » existants.The object of the invention is to further improve the corrosion resistance compared to existing “long life” alloys.
L'invention a pour objet un produit laminé ou filé, notamment un tube, en alliage de composition (% en poids) :The subject of the invention is a rolled or extruded product, in particular a tube, made of an alloy of composition (% by weight):
Si < 0,30 Fe : 0,20 - 0,50 Cu < 0,05 Mn : 0,5 - 1,2 Mg < 0,05 Zn < 0,50 Cr : 0,10 - 0,30 Ti < 0,05 Zr < 0,05 reste aluminium et impuretés inévitables.If <0.30 Fe: 0.20 - 0.50 Cu <0.05 Mn: 0.5 - 1.2 Mg <0.05 Zn <0.50 Cr: 0.10 - 0.30 Ti <0 .05 Zr <0.05 remains aluminum and inevitable impurities.
Les teneurs préférentielles sont : Si < 0,15 Fe : 0,25 - 0,40 Mn : 0,8 - 1,0 Cr : 0,15 - 0,30 Zn : 0,10 - 0,25The preferred contents are: Si <0.15 Fe: 0.25 - 0.40 Mn: 0.8 - 1.0 Cr: 0.15 - 0.30 Zn: 0.10 - 0.25
L'invention a également pour objet un procédé de fabrication de tubes filés de cette composition comportant la coulée d'une billette de la composition précédente, éventuellement l'homogénéisation de cette billette, le filage d'un tube, l'étirage de ce tube en une ou plusieurs passes et le recuit en continu à une température comprise entre 350 et 500°C avec une montée en température de moins de 10 secondes, et de préférence moins de 2 secondes. L'invention a également pour objet un procédé de fabrication de bandes de cette composition, comportant la coulée d'une plaque, son laminage à chaud, puis à froid, et un recuit en continu à une température comprise entre 350 et 500°C avec une montée en température de moins de 10 minutes, et de préférence de moins de 2 minutes.The invention also relates to a method of manufacturing spun tubes of this composition comprising the casting of a billet of the preceding composition, optionally the homogenization of this billet, the spinning of a tube, the drawing of this tube in one or more passes and continuous annealing at a temperature between 350 and 500 ° C with a rise in temperature of less than 10 seconds, and preferably less than 2 seconds. The subject of the invention is also a process for manufacturing strips of this composition, comprising the casting of a plate, its hot rolling, then cold rolling, and continuous annealing at a temperature between 350 and 500 ° C. with a rise in temperature of less than 10 minutes, and preferably less than 2 minutes.
Description de l'invention L'alliage selon l'invention comporte une teneur en manganèse du même ordre que celle des alliages 3003 ou 3103 et ne contient pratiquement pas de cuivre ni de magnésium. Contrairement à l'enseignement de l'art antérieur qui préconise de basses teneurs en fer pour la résistance à la corrosion, l'alliage présente un bon comportement avec une teneur en fer supérieure à 0,20%> et pouvant aller jusqu'àDescription of the invention The alloy according to the invention has a manganese content of the same order as that of alloys 3003 or 3103 and contains practically no copper or magnesium. Unlike the teaching of the prior art which recommends low iron contents for corrosion resistance, the alloy exhibits good behavior with an iron content greater than 0.20%> and up to
0,50%. Ceci permet d'éviter l'emploi d'une base aluminium pure plus coûteuse.0.50%. This avoids the use of a more expensive pure aluminum base.
Contrairement également à l'enseignement de l'art antérieur, une teneur en chrome supérieure à 0,10%, et de préférence à 0,15% s'est révélée favorable à la résistance à la corrosion. Une addition de zinc à une teneur faible, inférieure à 0,50%, et de préférence à 0,20%, est également favorable.Contrary also to the teaching of the prior art, a chromium content greater than 0.10%, and preferably 0.15%, has been found to favor corrosion resistance. An addition of zinc at a low content, less than 0.50%, and preferably 0.20%, is also favorable.
Le procédé de fabrication des produits filés, notamment des tubes, comporte la coulée de billettes de l'alliage indiqué, l'homogénéisation des billettes, leur réchauffage et leur filage pour obtenir un tube en longueur droite ou en couronne, et une ou plusieurs passes d'étirage pour amener le produit aux dimensions souhaitées. Le tube est ensuite recuit par défilement à grande vitesse dans un four à passage, de préférence un four à induction. Le réchauffage du produit filé est très rapide, inférieur à 10 secondes, et de préférence à 2 secondes, et le produit défile à une vitesse comprise entre 20 et 200 m/mn. La température du four est maintenue entreThe process for manufacturing spun products, in particular tubes, involves the casting of billets of the indicated alloy, the homogenization of the billets, their reheating and their spinning to obtain a tube in straight length or in a crown, and one or more passes stretching to bring the product to the desired dimensions. The tube is then annealed by high-speed scrolling in a pass-through oven, preferably an induction oven. The reheating of the spun product is very rapid, less than 10 seconds, and preferably 2 seconds, and the product runs at a speed of between 20 and 200 m / min. The oven temperature is maintained between
350 et 500°C. Le produit peut ensuite subir un nouvel étirage pour augmenter la résistance mécanique.350 and 500 ° C. The product can then be re-stretched to increase the mechanical strength.
Ce recuit continu conduit à une microstructure à grains fins équiaxes, d'une taille de grain moyenne, mesurée par la méthode des intercepts, inférieure à 40 μm, et typiquement de l'ordre de 30 μm, alors qu'avec un recuit classique dans un four statique, les grains sont allongés avec une taille de grain beaucoup plus grande, de l'ordre de 180 μm dans le sens du filage et de 70 μm dans le sens perpendiculaire au filage. La présence de chrome tend encore à diminuer la taille de grain en augmentant la densité des sites de recristallisation, ce qui a un effet bénéfique sur la résistance à la corrosion.This continuous annealing leads to a microstructure with fine equiaxed grains, of an average grain size, measured by the intercepts method, less than 40 μm, and typically of the order of 30 μm, whereas with a conventional annealing in in a static oven, the grains are elongated with a much larger grain size, of the order of 180 μm in the spinning direction and 70 μm in the direction perpendicular to the spinning. The presence of chromium further tends to decrease the grain size by increasing the density of the recrystallization sites, which has a beneficial effect on the corrosion resistance.
Le procédé de fabrication des bandes comporte la coulée d'une plaque de la composition selon l'invention, éventuellement l'homogénéisation de cette plaque, le laminage à chaud de cette plaque pour obtenir une bande, le laminage à froid de cette bande jusqu'à l'épaisseur désirée et un recuit final de recristallisation à une température comprise entre 350 et 600°C. Ce recuit final se fait de préférence en continu dans un four à passage avec une montée en température de moins de 10 minutes, et de préférence moins de 2 minutes, ce qui conduit à une taille de grain fine. La bande laminée à chaud peut également être obtenue directement par coulée continue, par exemple par coulée entre deux cylindres refroidis. Les produits selon l'invention présentent une résistance à la corrosion meilleure que le 3003 ou le 3103, et au moins aussi bonne que les alliages « long life » de l'art antérieur, des caractéristiques mécaniques et une formabilité équivalentes au 3003 ou au 3103, et un coût d'élaboration économique. Ils présentent un potentiel de corrosion électrochimique pratiquement identique à celui du 3003 ou du 3103, de sorte qu'il n'y a pas de différence de comportement des couples galvaniques, par exemple le couple tube-ailette des échangeurs thermiques. Les produits filés présentent par ailleurs une aptitude au filage au moins aussi bonne que celle des alliages 3003 ou 3103. Les produits filés selon l'invention sont utilisables notamment comme tubes de canalisations de carburant, d'huile ou de liquide de freins pour automobiles et comme tubes destinés aux échangeurs thermiques des systèmes de refroidissement moteur et de climatisation d'habitacle des véhicules automobiles. Les bandes peuvent être utilisés dans les mêmes échangeurs pour les collecteurs, les évaporateurs ou les ailettes.The strip manufacturing process includes the casting of a plate of the composition according to the invention, optionally the homogenization of this plate, the hot rolling of this plate to obtain a strip, the cold rolling of this strip up to to the desired thickness and a final recrystallization annealing at a temperature between 350 and 600 ° C. This final annealing is preferably done in continuous in a passage oven with a temperature rise of less than 10 minutes, and preferably less than 2 minutes, which leads to a fine grain size. The hot rolled strip can also be obtained directly by continuous casting, for example by casting between two cooled rolls. The products according to the invention have a better corrosion resistance than 3003 or 3103, and at least as good as the “long life” alloys of the prior art, mechanical characteristics and formability equivalent to 3003 or 3103 , and an economic development cost. They have an electrochemical corrosion potential practically identical to that of 3003 or 3103, so that there is no difference in behavior of the galvanic couples, for example the tube-fin pair of the heat exchangers. The spun products also have a spinning ability at least as good as that of alloys 3003 or 3103. The spun products according to the invention can be used in particular as fuel, oil or brake fluid line pipes for cars and as tubes intended for heat exchangers of engine cooling and passenger compartment air conditioning systems of motor vehicles. The strips can be used in the same exchangers for manifolds, evaporators or fins.
ExempleExample
On a coulé et homogénéisé des billettes en 6 alliages répertoriés A à F. Les alliages A, B et C correspondent à des compositions de 3003, 3103 et X3020 de l'art antérieur. Les alliages D et E diffèrent de la composition selon l'invention par un fer plus bas pour D et du titane à la place du chrome pour E. L'alliage F est conforme à l'invention. Les compositions des alliages (% en poids) sont indiquées au tableau 1. Tableau 1Billet was poured and homogenized in 6 alloys listed A to F. The alloys A, B and C correspond to compositions of 3003, 3103 and X3020 of the prior art. The alloys D and E differ from the composition according to the invention by a lower iron for D and titanium in place of the chromium for E. The alloy F is in accordance with the invention. The compositions of the alloys (% by weight) are indicated in Table 1. Table 1
Les billettes ont été filées en couronnes de tubes puis étirées pour obtenir un diamètre de 12 mm et une épaisseur de 1,25 mm. Aucune différence significative n'a été enregistrée pour les 6 alliages concernant leur aptitude au filage ou à l'étirage. Ces couronnes ont été recuites en continu dans un four à induction à une température fixée à 470°C, avec une vitesse de passage entre 60 et 120 m/mn. Les couronnes ont subi ensuite une nouvelle passe d'étirage pour les amener à l'état H12 selon la norme EN 515. On a mesuré, sur des échantillons des 6 tubes, la résistance à la rupture Rm (en MPa) et la limite d'élasticité Ro;2 (en MPa). Les résultats sont indiqués au tableau 2.The billets were spun into tube crowns and then stretched to obtain a diameter of 12 mm and a thickness of 1.25 mm. No significant difference was recorded for the 6 alloys concerning their suitability for spinning or drawing. These crowns were continuously annealed in an induction furnace at a temperature set at 470 ° C, with a passage speed between 60 and 120 m / min. The crowns were then subjected to a new drawing pass to bring them to the H12 state according to standard EN 515. The tensile strength R m (in MPa) and the limit were measured on samples of the 6 tubes. elasticity Ro ; 2 (in MPa). The results are shown in Table 2.
Tableau 2Table 2
On constate que l'alliage selon l'invention conduit à une résistance mécanique pratiquement identique à celle du 3003 (A) ou du 3103 (B). La résistance à la corrosion a été mesurée à l'aide du test SWAAT (sait water acetic acid test) selon la norme ASTM G85. Les mesures ont été faites pour 3 durées de cycles : 100, 400 et 800 cycles, sur deux tubes par alliage et par durée de longueur 200 mm. A la fin de l'essai, les tubes sont sortis de l'enceinte et décapés dans une solution d'acide nitrique concentrée à 68% afin de dissoudre les produits de corrosion. Sur chaque tube, on mesure ensuite la profondeur des 5 piqûres les plus profondes et on calcule la moyenne pour chaque tube et la moyenne Pmoy des valeurs obtenues pour les deux tubes. La résistance à la corrosion est d'autant meilleure que Pmoy est faible. Les résultats sont repris au tableau 3.It is found that the alloy according to the invention leads to a mechanical resistance practically identical to that of 3003 (A) or 3103 (B). The corrosion resistance was measured using the SWAAT test (knows water acetic acid test) according to standard ASTM G85. The measurements were made for 3 cycle durations: 100, 400 and 800 cycles, on two tubes per alloy and per duration of length 200 mm. At the end of the test, the tubes are taken out of the enclosure and pickled in a 68% concentrated nitric acid solution to dissolve corrosion products. On each tube, the deeper and the average is calculated is then measured depth of 5 injections to each tube and the average P avg values obtained for the two tubes. The corrosion resistance is all the better when P avg is low. The results are shown in Table 3.
Tableau 3Table 3
On constate que l'alliage F selon l'invention est celui qui donne les meilleurs résultats, et donc la teneur en fer de 0,21% ne nuit pas à la résistance à la corrosion, et l'addition de 0,20%) de chrome pour les alliages D et F a un effet nettement bénéfique. It is found that the alloy F according to the invention is the one which gives the best results, and therefore the iron content of 0.21% does not harm the corrosion resistance, and the addition of 0.20%) of chromium for alloys D and F has a clearly beneficial effect.

Claims

Revendicationsclaims
l. Produit laminé ou filé, notamment un tube, en alliage de composition (%> en poids) :l. Rolled or extruded product, in particular a tube, made of an alloy of composition (%> by weight):
Si < 0,30 Fe : 0,20 - 0,50 Cu < 0,05 Mn : 0,5 - 1,2 Mg < 0,05 Zn < 0,50 Cr : 0,10 - 0,30 Ti < 0,05 Zr < 0,05 reste aluminium et impuretés inévitables.If <0.30 Fe: 0.20 - 0.50 Cu <0.05 Mn: 0.5 - 1.2 Mg <0.05 Zn <0.50 Cr: 0.10 - 0.30 Ti <0 .05 Zr <0.05 remains aluminum and inevitable impurities.
2. Produit selon la revendication 1, caractérisé en ce que Si < 0,202. Product according to claim 1, characterized in that Si <0.20
3. Produit selon l'une des revendications 1 ou 2, caractérisé en ce que Fe : 0,25 - 0,40.3. Product according to one of claims 1 or 2, characterized in that Fe: 0.25 - 0.40.
4. Produit selon l'une des revendications 1 à 3, caractérisé en ce que Mn : 0,8 - 1,0.4. Product according to one of claims 1 to 3, characterized in that Mn: 0.8 - 1.0.
5. Produit selon l'une des revendications 1 à 4, caractérisé en ce que Cr : 0,15 - 0,30.5. Product according to one of claims 1 to 4, characterized in that Cr: 0.15 - 0.30.
6. Produit selon l'une des revendications 1 à 5, caractérisé en ce que Zn : 0,10 - 0,25.6. Product according to one of claims 1 to 5, characterized in that Zn: 0.10 - 0.25.
7. Produit filé selon l'une des revendications 1 à 6, caractérisé en ce que sa taille de grain est inférieure à 40 μm.7. A spun product according to one of claims 1 to 6, characterized in that its grain size is less than 40 μm.
8. Procédé de fabrication de tubes filés selon l'une des revendications 1 à 7, comportant la coulée d'une billette, éventuellement l'homogénéisation de cette billette, le filage d'un tube, l'étirage de ce tube en une ou plusieurs passes et le recuit en continu à une température comprise entre 350 et 500°C avec une montée en température de moins de 10 s. 8. A method of manufacturing spun tubes according to one of claims 1 to 7, comprising the casting of a billet, optionally the homogenization of this billet, the spinning of a tube, the stretching of this tube in one or several passes and continuous annealing at a temperature between 350 and 500 ° C with a rise in temperature of less than 10 s.
9. Procédé selon la revendication 8, caractérisé en ce que la montée en température se fait en moins de 2 s.9. Method according to claim 8, characterized in that the temperature rise takes place in less than 2 s.
10. Procédé selon l'une des revendications 8 ou 9, caractérisé en ce que le recuit se fait dans un four à induction.10. Method according to one of claims 8 or 9, characterized in that the annealing is done in an induction furnace.
11. Procédé selon l'une des revendications 8 à 10, caractérisé en ce que le recuit est suivi d'un étirage.11. Method according to one of claims 8 to 10, characterized in that the annealing is followed by drawing.
12. Utilisation d'un produit filé selon l'une des revendications 1 à 7 comme tube de canalisation pour l'automobile.12. Use of a spun product according to one of claims 1 to 7 as a pipe tube for the automobile.
13. Utilisation d'un produit filé selon l'une des revendications 1 à 7 comme tube d'échangeur thermique d'automobile.13. Use of a spun product according to one of claims 1 to 7 as an automobile heat exchanger tube.
14. Procédé de fabrication de bandes selon l'une des revendications 1 à 7, comportant la coulée d'une plaque, éventuellement l'homogénéisation de cette plaque, le laminage à chaud de cette plaque pour obtenir une bande, le laminage à froid de cette bande jusqu'à l'épaisseur désirée et un recuit final de recristallisation à une température comprise entre 350 et 600°C, avec une montée en température de moins de 10 minutes, et de préférence de moins de 2 minutes.14. A method of manufacturing strips according to one of claims 1 to 7, comprising the casting of a plate, optionally the homogenization of this plate, the hot rolling of this plate to obtain a strip, the cold rolling of this strip up to the desired thickness and a final recrystallization annealing at a temperature between 350 and 600 ° C., with a rise in temperature of less than 10 minutes, and preferably less than 2 minutes.
15. Utilisation d'une bande selon l'une des revendications 1 à 7 comme élément d'échangeur thermique d'automobile. 15. Use of a strip according to one of claims 1 to 7 as an automobile heat exchanger element.
EP02700316A 2001-01-12 2002-01-09 Rolled or extruded aluminium al-mn alloy products with improved corrosion resistance Expired - Lifetime EP1349965B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0100432A FR2819525B1 (en) 2001-01-12 2001-01-12 LAMINATED OR ALUMINUM AL-Mn ALLOY PRODUCTS WITH IMPROVED CORROSION RESISTANCE
FR0100432 2001-01-12
PCT/FR2002/000059 WO2002055750A2 (en) 2001-01-12 2002-01-09 Rolled or extruded aluminium al-mn alloy products with improved corrosion resistance

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EP1349965A2 true EP1349965A2 (en) 2003-10-08
EP1349965B1 EP1349965B1 (en) 2005-02-16

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EP (1) EP1349965B1 (en)
AT (1) ATE289364T1 (en)
AU (1) AU2002233405A1 (en)
DE (1) DE60202994T2 (en)
FR (1) FR2819525B1 (en)
WO (1) WO2002055750A2 (en)

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JP5191144B2 (en) * 2007-03-02 2013-04-24 矢崎総業株式会社 Wire, electric wire, and manufacturing method of wire
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FR2819525B1 (en) 2003-02-28
EP1349965B1 (en) 2005-02-16
WO2002055750A2 (en) 2002-07-18
FR2819525A1 (en) 2002-07-19
US20040040634A1 (en) 2004-03-04
AU2002233405A1 (en) 2002-07-24
WO2002055750A3 (en) 2002-09-26
US6896749B2 (en) 2005-05-24
ATE289364T1 (en) 2005-03-15
DE60202994D1 (en) 2005-03-24
DE60202994T2 (en) 2006-04-13

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