EP0818553A1 - Feuille d'aluminium du type AA5000 et procédé pour sa fabrication - Google Patents

Feuille d'aluminium du type AA5000 et procédé pour sa fabrication Download PDF

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Publication number
EP0818553A1
EP0818553A1 EP97201948A EP97201948A EP0818553A1 EP 0818553 A1 EP0818553 A1 EP 0818553A1 EP 97201948 A EP97201948 A EP 97201948A EP 97201948 A EP97201948 A EP 97201948A EP 0818553 A1 EP0818553 A1 EP 0818553A1
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EP
European Patent Office
Prior art keywords
sheet
content
aluminium alloy
solution heat
heat treatment
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
EP97201948A
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German (de)
English (en)
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EP0818553B1 (fr
Inventor
Jan Bottema
Paul Hendrikus Theodorus Kaasenbrood
Peter De Smet
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.)
Alvance Aluminium Duffel BV
Original Assignee
Hoogovens Aluminium BV
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Publication date
Application filed by Hoogovens Aluminium BV filed Critical Hoogovens Aluminium BV
Publication of EP0818553A1 publication Critical patent/EP0818553A1/fr
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—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 magnesium as the next major constituent

Definitions

  • This invention relates to a method for the manufacture of aluminium alloy sheet having a content of Mg of 1.5 to 8 wt%, particularly having a composition belonging to the AA5000 series.
  • the invention also relates to the sheet produced by the method, which is particularly suitable for forming applications for example in the manufacture of body parts by pressing in the automotive industry.
  • sheet is not only taken to mean sheets obtained by cutting, but also strip-shaped sheet e.g. in coil form, which has not yet been cut.
  • aluminium alloys containing Mg as a main alloying element it is known to include at least one of Mn, Cr or Zr approximately 0.10-0.5 wt% (percentage by weight; herein all percentages are by weight unless otherwise specified).
  • Mn, Cr and Zr are so-called dispersoid-forming alloying elements and their addition to the aluminium alloy obtains an effective grain refinement during annealing following cold-rolling.
  • Other alloying elements may also be added for this purpose such as Co, Ti, Ni or V, but in practice Mn, Cr and Zr are the most used.
  • a disadvantage is that these alloying elements have low solubility in aluminium.
  • a further disadvantage is that these alloying elements are relatively expensive, while the value and the applicability of scrap material containing in particular Zr and/or Cr is low.
  • JP-A-5-345693 proposes an alloy having 6-10% Mg and a total of 0.01-0.2% of (Mn + Cr + Zr + V), which after rolling to final thickness is heat treated in a continuous annealing furnace at 450-550°C for less than 120s and then immediately cooled at 800°C/min or more to obtain a crystal grain size of 20-120 ⁇ m. This heat treatment is as short as even 3s.
  • EP-A-681034 also describes an alloy having low content of (Fe + Mn + Cr + Ti + Zr) which is subjected at final thickness to heat treatment by heating at a rate of at least 100°C/min to 450-550°C and maintaining the maximum temperature for not more than 300s.
  • the cooling rate is 100°C/min or more.
  • the temperature range is selected to achieve a desired recrystallization.
  • the fastest heating rate mentioned is 540°C/min, but no particular reason is given for the selection of heating rate.
  • EP-A-646655 also describes alloy sheets having low (Cr + Mn + Zr + V) which at final thickness are subjected to the heat treatment of heating at at least 3°C/s to 500-580°C, maintaining the maximum temperature for 0-60s and cooling at at least 2°C/s. It is said that if the temperature exceeds 580°C, the heating rate is less than 3°C/s or the temperature is maintained for more than 60s, abnormal grain growth occurs.
  • the object of the present invention is to provide a method of manufacture of an aluminium alloy sheet having good formability in which the contents of Mn, Cr and Zr in particular are low.
  • a method for the manufacture of aluminium alloy sheet having a content of Mg of 1.5 to 8.0 wt% and a total content of (Mn + Cr + Zr) of not more than 0.1 wt% comprising a solution heat treatment step at final thickness of the sheet in a continuous annealing furnace, characterised in that in said solution heat treatment the heating rate of the sheet in the heating region of said continuous annealing furnace is at least 50°C/s.
  • the sum of the (Mn + Cr + Zr)-content is less than or equal to 0.1%.
  • deliberately no Mn, Cr or Zr is added to the alloy, other than what is by chance or inevitably present in the recycling scrap used. This achieves the effect that adding these relatively expensive alloying elements may be omitted, while at the same time the value and the applicability of the recycling scrap of the aluminium sheet produced in accordance with the invention increase.
  • the average grain size after the solution heat treatment is in the range 20-80 ⁇ m.
  • grain size is taken to mean the average grain diameter according to ASTM-E-112. This achieves the effect that the formability of the aluminium sheet is optimal. With a grain size smaller than approximately 20 ⁇ m, the formability of the aluminium sheet may sharply decrease, while it may also not be possible to suppress the formation of so-called Lüders lines. If the grain size in the aluminium sheet is larger than approximately 80 ⁇ m, then a so-called orange peel can form during pressing. This is an undesired effect.
  • the Fe-content is preferably less than 0.5% and more preferably less than approximately 0.25%. With an Fe-content larger than approximately 0.5%, relatively large intermetallic compounds may form which can greatly reduce the formability of the aluminium sheet. An Fe-content less than 0.25% achieves the effect that the aluminium sheet combines a good formability with an average grain size in the desired range.
  • the Si-content is preferably less than approximately 0.4% more and preferably less than 0.2%. This achieves the effect that the aluminium sheet combines a good formability with an average grain size in the desired range.
  • the Cu-content may be less than 1.0% and preferably in the range 0.3-0.7%. This achieves the effect that the aluminium sheet is thermally hardenable.
  • Cu is in a range up to a maximum 0.20%.
  • the element Cu is to be regarded as an impurity and is not deliberately added to the alloy, other than what is present by chance or inevitably in the recycling scrap used.
  • Ti may be present as grain refining element for the cast micro-structure.
  • the Ti-content is preferably less than 0.2% and more preferably less than 0.1% in order to prevent the formation of coarse TiAl 3 particles during solidification.
  • the Ti may be added in combination with the elements B or C and preferably the B content is in a range less than 0.01% to prevent the presence of TiB 2 particles in the structure.
  • Zn may be present in a range up to a maximum 0.25%. Generally Zn is to be regarded as an impurity and is not deliberately added to the alloy other than what is present by chance or inevitably in the recycling scrap used. Zn can be tolerated in a greater range than other impurities but the Zn content is desirably limited to the stated range.
  • dispersoid-forming elements such as Co, Ni and V are also preferably only at impurity level, if present.
  • the sheet may be brought to its final thickness (finished thickness at end of the rolling processes) by conventional rolling techniques.
  • the aluminium sheet is then solution heat-treated so that recrystallization takes place, in a continuous annealing furnace.
  • the heating rate of the aluminium sheet in the heating section of the continuous annealing furnace is at least 50°C/s, and is preferably over 80°C/s.
  • the maximum temperature is preferably within the temperature range 450-570°C and the time at this temperature is preferably 5-300s, and more preferably 5-30s.
  • the aluminium sheet is preferably cooled to below 150°C at a cooling rate of at least 100°C/min.
  • the method in accordance with the invention has many advantages. Firstly the mechanical properties of the aluminium sheet produced in accordance with the invention can be at least comparable to those of aluminium sheet of the AA5000 type alloy in the stated range of the Mg-content in which at least one of the alloying elements Zr, Cr or Mn is also present in a range greater than 0.1%. Secondly the formability of the aluminium sheet in accordance with the invention can be greater than an aluminium sheet of a similar type of alloy with about the same Mg-content, but with the presence of such alloying elements as Zr, Cr or Mn. This is achieved in part because the grain size is in the stated range attained with the heat-treatment in accordance with the invention.
  • Figs. 1 and 2 show graphically the test results of the following Examples.
  • continuous annealed sheet with a heating rate of approximately 100°C/sec has a higher Ag, A80 and "n"-exponent than sheet with a heating rate of approximately 5°C/sec.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
EP19970201948 1996-06-28 1997-06-26 Procédé de fabrication de feuille d'aluminium du type AA5000 Expired - Lifetime EP0818553B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1003453A NL1003453C2 (nl) 1996-06-28 1996-06-28 Aluminiumplaat van het AA5000-type en een werkwijze voor het vervaardigen daarvan.
NL1003453 1996-06-28

Publications (2)

Publication Number Publication Date
EP0818553A1 true EP0818553A1 (fr) 1998-01-14
EP0818553B1 EP0818553B1 (fr) 2001-02-28

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ID=19763096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970201948 Expired - Lifetime EP0818553B1 (fr) 1996-06-28 1997-06-26 Procédé de fabrication de feuille d'aluminium du type AA5000

Country Status (3)

Country Link
EP (1) EP0818553B1 (fr)
DE (1) DE69704139D1 (fr)
NL (1) NL1003453C2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1138407A1 (fr) * 2000-03-27 2001-10-04 Corus Technology BV Méthode de hydroformage d'un élément de construction
CN1107740C (zh) * 2000-01-27 2003-05-07 中南工业大学 铝、镁合金的固溶或均匀化热处理方法
EP2888383B1 (fr) 2012-08-22 2016-03-30 Hydro Aluminium Rolled Products GmbH Bande d'alliage en aluminium résistant à la corrosion intercristalline et son procédé de fabrication
WO2016196921A1 (fr) * 2015-06-05 2016-12-08 Novelis Inc. Alliages d'aluminium 5xxx et leurs procédés de production
EP3006579B1 (fr) 2014-12-11 2017-06-07 Aleris Aluminum Duffel BVBA Procédé de traitement thermique en continu de matériau de feuille d'alliage d'aluminium de la série 7000
EP3191613B1 (fr) 2014-09-12 2019-01-23 Aleris Aluminum Duffel BVBA Procédé de recuit d'un matériau de feuille d'alliage d'aluminium
WO2020182506A1 (fr) * 2019-03-08 2020-09-17 Aleris Aluminum Duffel Bvba Procédé de fabrication d'un produit de tôle de série 5xxx

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540449A (en) * 1983-03-31 1985-09-10 Nippon Light Metal Company Limited Aluminum substrate for magnetic recording media
US5244516A (en) * 1988-10-18 1993-09-14 Kabushiki Kaisha Kobe Seiko Sho Aluminum alloy plate for discs with improved platability and process for producing the same
JPH05345963A (ja) * 1992-06-12 1993-12-27 Furukawa Alum Co Ltd 高成形性アルミニウム合金板の製造方法
EP0593034A2 (fr) * 1992-10-13 1994-04-20 Kawasaki Steel Corporation Tôle en alliage d'aluminium ayant une excellente plasticité et sa méthode de production
EP0594509A1 (fr) * 1992-10-23 1994-04-27 The Furukawa Electric Co., Ltd. Procédé de fabrication de feuilles en alliage Al-Mg pour formage sous pression
EP0646655A1 (fr) * 1993-09-30 1995-04-05 Nkk Corporation Procédé de fabrication d'un alliage d'aluminium avec vieillissement naturel et retardé et présentant une aptitude excellente au formage et au durcissement par cuisson
EP0681034A1 (fr) * 1994-05-06 1995-11-08 The Furukawa Electric Co., Ltd. Procédé de fabrication d'une feuille en alliage d'aluminium pour carrosserie de véhicules et feuille en alliage ainsi obtenue
EP0773303A1 (fr) * 1995-11-10 1997-05-14 Nkk Corporation TÔle d'alliage d'aluminium et procédé pour sa production

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540449A (en) * 1983-03-31 1985-09-10 Nippon Light Metal Company Limited Aluminum substrate for magnetic recording media
US5244516A (en) * 1988-10-18 1993-09-14 Kabushiki Kaisha Kobe Seiko Sho Aluminum alloy plate for discs with improved platability and process for producing the same
JPH05345963A (ja) * 1992-06-12 1993-12-27 Furukawa Alum Co Ltd 高成形性アルミニウム合金板の製造方法
EP0593034A2 (fr) * 1992-10-13 1994-04-20 Kawasaki Steel Corporation Tôle en alliage d'aluminium ayant une excellente plasticité et sa méthode de production
EP0594509A1 (fr) * 1992-10-23 1994-04-27 The Furukawa Electric Co., Ltd. Procédé de fabrication de feuilles en alliage Al-Mg pour formage sous pression
EP0646655A1 (fr) * 1993-09-30 1995-04-05 Nkk Corporation Procédé de fabrication d'un alliage d'aluminium avec vieillissement naturel et retardé et présentant une aptitude excellente au formage et au durcissement par cuisson
EP0681034A1 (fr) * 1994-05-06 1995-11-08 The Furukawa Electric Co., Ltd. Procédé de fabrication d'une feuille en alliage d'aluminium pour carrosserie de véhicules et feuille en alliage ainsi obtenue
EP0773303A1 (fr) * 1995-11-10 1997-05-14 Nkk Corporation TÔle d'alliage d'aluminium et procédé pour sa production

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 191 (C - 1186) 4 April 1994 (1994-04-04) *
W.HUFNAGEL: "ALUMINIUM-SCHLUESSEL", 1983, ALUMINUM VERLAG, DUESSELDORF, DE, XP002025184 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1107740C (zh) * 2000-01-27 2003-05-07 中南工业大学 铝、镁合金的固溶或均匀化热处理方法
EP1138407A1 (fr) * 2000-03-27 2001-10-04 Corus Technology BV Méthode de hydroformage d'un élément de construction
EP2888383B1 (fr) 2012-08-22 2016-03-30 Hydro Aluminium Rolled Products GmbH Bande d'alliage en aluminium résistant à la corrosion intercristalline et son procédé de fabrication
EP3191613B1 (fr) 2014-09-12 2019-01-23 Aleris Aluminum Duffel BVBA Procédé de recuit d'un matériau de feuille d'alliage d'aluminium
EP3006579B1 (fr) 2014-12-11 2017-06-07 Aleris Aluminum Duffel BVBA Procédé de traitement thermique en continu de matériau de feuille d'alliage d'aluminium de la série 7000
US10513767B2 (en) 2014-12-11 2019-12-24 Aleris Aluminum Duffel Bvba Method of continuously heat-treating 7000-series aluminium alloy sheet material
EP3006579B2 (fr) † 2014-12-11 2022-06-01 Aleris Aluminum Duffel BVBA Procédé de traitement thermique en continu de matériau de feuille d'alliage d'aluminium de la série 7000
WO2016196921A1 (fr) * 2015-06-05 2016-12-08 Novelis Inc. Alliages d'aluminium 5xxx et leurs procédés de production
WO2020182506A1 (fr) * 2019-03-08 2020-09-17 Aleris Aluminum Duffel Bvba Procédé de fabrication d'un produit de tôle de série 5xxx

Also Published As

Publication number Publication date
NL1003453C2 (nl) 1998-01-07
DE69704139D1 (de) 2001-04-05
EP0818553B1 (fr) 2001-02-28

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