EP0507411B1 - Aluminiumblech und Verfahren zu seiner Herstellung - Google Patents

Aluminiumblech und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0507411B1
EP0507411B1 EP92200925A EP92200925A EP0507411B1 EP 0507411 B1 EP0507411 B1 EP 0507411B1 EP 92200925 A EP92200925 A EP 92200925A EP 92200925 A EP92200925 A EP 92200925A EP 0507411 B1 EP0507411 B1 EP 0507411B1
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EP
European Patent Office
Prior art keywords
sheet
annealing
max
grain size
iii
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.)
Revoked
Application number
EP92200925A
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English (en)
French (fr)
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EP0507411A1 (de
Inventor
Paul Mariette Clement Neutjens
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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Application filed by Hoogovens Aluminium BV filed Critical Hoogovens Aluminium BV
Publication of EP0507411A1 publication Critical patent/EP0507411A1/de
Application granted granted Critical
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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
    • 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
    • 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

Definitions

  • the invention relates to a method for the manufacture of soft, deformable SSF aluminium sheet having a composition belonging to the known AA 5000 series of Al-Mg alloys with a Mg content of over 0.8% Mg, and to sheet of this type.
  • the sheet is suitable for deforming purposes such as, for example, the manufacture of bodywork parts for cars by pressing.
  • 'soft' in relation to the aluminium sheet of the type described above, 'soft' is understood to describe the supply condition of the sheet.
  • the supply condition 'soft' relates to the condition following recrystallization annealing, which may sometimes be followed by a light post-treatment such as flattening.
  • the material In its 'soft' condition, the material is ready for shaping by deformation involving curvature in two planes.
  • 'sheet' is understood to be not only sheets obtained by cutting off, but also strip-shaped sheet still on coils until cut off.
  • 'SSF' S tretcher S train F ree
  • S tretcher S train F ree S tretcher S train F ree
  • Lüder lines are also known in steel. For this reason, deformation steel is usually temper rolled. This is not customary with aluminium because this cold work-hardening reduces deformability to a significant degree.
  • Al-Mg alloys of the 5000 series are very susceptible to Lüder lines.
  • the conventional way to make material unsusceptible to type A Lüder lines is to ensure that the grain size of the material is greater than 50 ⁇ m at finished gauge. With a grain size of over 50 ⁇ m the risk of type A Lüder lines is then low. This is achieved by recrystallization annealing at a gauge greater than the finished gauge, so-called intermediate annealing. Thereafter, in a second cold rolling stage the material is brought to finished gauge with a precisely determined reduction in the range of 15 to 20% and is again recrystallization annealed, so-called final annealing. If reduced more the grain size is smaller than 50 ⁇ m and Lüder lines occur.
  • US-A-4151013 describes AA 5000 Al-Mg alloy SSF sheet.
  • the document discusses the disadvantages and failure of a process for dealing with type A lines involving annealing at 500°C (or 300°C) then quenching in cold water and finally lightly rolling or roller-levelling.
  • the new process proposed by the document includes a brief annealing followed by a slight but significant stretching, of about 0.5%.
  • the annealing is said to involve quenching at rates slower than a cold-water quench.
  • the details of the specific process of continuous annealing described imply that a very rapid heating rate during annealing was not used.
  • the grain size of this product is not mentioned.
  • GB-A-2024861 describes an Al-Mg alloy SSF sheet having a content of Zn (0.5 to 2.0%) which places it outside the AA 5000 series.
  • the sheet has grain size of less than 50 ⁇ m. Comparative tests in this document suggest that a AA 5000 sheets having a grain size of less than 50 ⁇ m are not SSF.
  • EP-A-259700 proposes that, after a T4 solution heat treatment and straightening of Al-Mg alloy containing 2 to 6% Mg, a post-heat-treatment involving rapid heating and cooling is performed; this post-heat-treatment is an artificial ageing, not a recrystallization heat treatment.
  • the alloy is of the so-called heat-treatable type.
  • the alloys of the present invention are not suitable for T4 treatment.
  • US-A-4021271 describes a different kind of aluminium product containing 2-9% Mg, and also containing 0.75-5% aluminide-forming transition elements such as Fe, Co, Ni, whose function is cause formation of fine aluminide particles in casting.
  • aluminide-forming transition elements such as Fe, Co, Ni, whose function is cause formation of fine aluminide particles in casting.
  • the cold-worked structure recrystallizes to give an ultra-fine structure with an average grain size of less than 15 ⁇ m.
  • Continuous and batch annealing is mentioned, but not heating or cooling rates are given.
  • the present invention excludes aluminium products of this kind in which aluminide-forming elements are present in order to achieve a fine grain size.
  • the object of the present invention is to provide an improved SSF Al-Mg sheet material and an improved method for its manufacture.
  • the invention in one aspect is set out in claim 1.
  • the grain size of the sheet after recrystallization annealing at finished gauge is less than 40 ⁇ m.
  • the grain size is understood to be the average grain diameter according to ASTM E 112.
  • the aluminium sheet is recrystallization annealed at finished gauge in a continuous annealing furnace with a heating rate in the heating section of the continuous annealing furnace of over 50°C/s and preferably of over 80°C/s, whereafter the sheet is rapidly quenched.
  • the aluminium sheet is warmed up homogeneously in the continuous annealing furnace by means of inductive heating.
  • the sheet is recrystallization annealed solely at finished thickness.
  • continuously annealed material made by the method of the invention does not display Lüder lines on cold plastic deformation.
  • continuously annealed material would not be Stretcher Strain Free on account of the small grain size which is obtained in continuous annealing.
  • the invention has many advantages. First of all the deformability of the sheet in accordance with the invention is excellent and the elastic limit is high. As a result of the small grain size the material does not display any orange-peel effect on deformation, so that in the deformed zones a very smooth surface appearance is obtained. Secondly, because of the very short annealing time at the surface of the sheet, practically no oxide layer forms on the sheet so that no discolorations occur and fewer problems arise during pressing. Also, in the case of continuous annealing after cold rolling, the rolling oil gives far less problems because no spots are left as a result of partial combustion. When there is no intermediate annealing, energy consumption is much lower and the throughput time of the product much shorter.
  • the method of production of sheet of the invention is generally in accordance with conventional principles, except as specified, for aluminium alloy sheet of this type, which is hot-rolled to a suitable thickness for the subsequent cold-rolling.
  • AA 5051 A material is a material from the AAA 5000 series containing 1.8% Mg, and standardized in DIN as AlMg 1.8.
  • Fe + Ni + Co is less than 0.50%.
  • the material was cold rolled with 75% reduction from an initial thickness of 4 mm to a final thickness of 1 mm.
  • the heating rate in the batch method was 40°C/hour, and for the continuously annealed samples (C and D) 80°C/s.
  • the heating temperatures and holding times were 1 hour at 400°C in the batch annealing and 1 to 15 seconds at 440°C in the continuous annealing.
  • the quenching was by water with a cooling rate of 400 °C/s (in the invention, a minimum cooling rate in the quenching of 200°C/s is preferred).
  • Figures 1A to 1D show the transition from the elastic to the plastic part of the stress/strain graphs of the samples A to D.
  • Sample B a material manufactured in accordance with the state of the art, does not have any horizontal plateau. However, horizontal plateaux were also not found with samples C and D, which embody the invention. Sample D which was not subjected to intermediate annealing is the best embodiment of the invention.
  • the grain size of sample B is greater than 50 ⁇ m, while the grain size of samples C and D is smaller than 50 ⁇ m.

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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)
  • Metal Rolling (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Forging (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (7)

  1. Verfahren zur Herstellung von weichem, verformbarem SSF-Aluminiumblech, das in Gew.-% die folgende Zusammensetzung hat: Mg 0,8 - 5,6 %, Si 0,4 % max., Fe + Ni + Co zusammen max. 0,75 Gew.-%, Cu 0,2 % max., Mn 1,0 % max., Cr 0,35 % max., Zn 0,25 max.,
    andere Elemente jeweils maximal 0,05 % und insgesamt maximal 0,15 %,
    Rest Al,
    welches Verfahren die Schritte aufweist:
    (i) Kaltwalzen des Bleches, optional mit Zwischenglühung, auf die Enddicke,
    (ii) Rekristallisationsglühung bei Enddicke in einem kontinuierlichen Glühofen mit einer Heizgeschwindigkeit von über 50°C/s,
    (iii) Abschrecken des Bleches nach dem Glühschritt (ii),
    wobei die Schritte (i) bis (iii) so sind, daß die Korngröße des Bleches nach dem Schritt (iii) weniger als 50 µm beträgt.
  2. Verfahren nach Anspruch 1, worin der Anteil von Fe + Ni + Co insgesamt nicht mehr als 0,50 % beträgt.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, das keine irgendwie geartete Streckung des Bleches nach dem Schritt (iii) umfaßt.
  4. Verfahren nach einem der Ansprüche 1 bis 3, worin die Heizgeschwindigkeit in Schritt (ii) über 80°C/s beträgt.
  5. Verfahren nach einem der Ansprüche 1 bis 4, worin das Aluminiumblech in dem kontinuierlichen Glühofen durch Induktionsheizung homogen erwärmt wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, worin das Blech ohne Zwischenglühung kaltgewalzt wird, wobei die Rekristallisationsglühung nur bei Enddicke ausgeführt wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, worin die Korngröße nach Schritt (iii) weniger als 40 µm beträgt.
EP92200925A 1991-04-02 1992-04-01 Aluminiumblech und Verfahren zu seiner Herstellung Revoked EP0507411B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9100565A NL9100565A (nl) 1991-04-02 1991-04-02 Aluminium plaat en werkwijze voor het vervaardigen daarvan.
NL9100565 1991-04-02

Publications (2)

Publication Number Publication Date
EP0507411A1 EP0507411A1 (de) 1992-10-07
EP0507411B1 true EP0507411B1 (de) 1997-12-10

Family

ID=19859079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92200925A Revoked EP0507411B1 (de) 1991-04-02 1992-04-01 Aluminiumblech und Verfahren zu seiner Herstellung

Country Status (5)

Country Link
EP (1) EP0507411B1 (de)
AT (1) ATE161056T1 (de)
DE (1) DE69223435T2 (de)
ES (1) ES2111035T3 (de)
NL (1) NL9100565A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7364630B2 (en) 2003-03-27 2008-04-29 Kobe Steel, Ltd. Al-Mg-Si alloy sheet excellent in surface properties, manufacturing method thereof, and intermediate material in the manufacturing thereof

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2731018B1 (fr) * 1995-02-24 1997-04-04 Pechiney Rhenalu Tole pour construction soudee en alliage almgmn a resistance mecanique amelioree
FR2731019B1 (fr) * 1995-02-24 1997-08-22 Pechiney Rhenalu Produit pour construction soudee en alliage almgmn a resistance mecanique amelioree
US5913989A (en) * 1996-07-08 1999-06-22 Alcan International Limited Process for producing aluminum alloy can body stock
NL1004761C2 (nl) * 1996-09-30 1998-07-02 Arend Anne Mollee Wielkern
NL1004154C2 (nl) * 1996-09-30 1998-04-06 Arend Anne Mollee Aluminium-magnesiumlegering.
SI1466992T1 (sl) * 2003-04-08 2007-12-31 Hydro Aluminium Deutschland Ploščat valjani polizdelek iz aluminijeve zlitine
FR3007041B1 (fr) * 2013-06-17 2016-12-09 Constellium Singen Gmbh Tole ou bande pour baguette decorative de vehicule automobile
EP3350355B1 (de) * 2015-09-18 2020-08-19 Norsk Hydro ASA Verfahren zur herstellung von extrudierten profilen, die mit hochglänzenden oberflächen anodisiert werden können, während die profile aus aushärtbarer, nach kaltumformung rekristallisierbarer 7xxx-aluminiumlegierung extrudiert werden
EP3690076A1 (de) 2019-01-30 2020-08-05 Amag Rolling GmbH Verfahren zur herstellung eines blechs oder bands aus einer aluminiumlegierung sowie ein dadurch hergestelltes blech, band oder formteil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO122618B (de) * 1968-10-30 1971-07-19 Olin Mathieson
CH638243A5 (de) * 1978-07-05 1983-09-15 Alusuisse Verfahren zur herstellung von magnesium- und zinkhaltigen aluminium-legierungs-blechen.
JPH0668146B2 (ja) * 1986-09-09 1994-08-31 スカイアルミニウム株式会社 アルミニウム合金圧延板の製造方法
JPH0699789B2 (ja) * 1989-02-23 1994-12-07 住友軽金属工業株式会社 耐食性に優れる高強度成形用アルミニウム合金硬質板の製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7364630B2 (en) 2003-03-27 2008-04-29 Kobe Steel, Ltd. Al-Mg-Si alloy sheet excellent in surface properties, manufacturing method thereof, and intermediate material in the manufacturing thereof

Also Published As

Publication number Publication date
DE69223435T2 (de) 1998-04-23
DE69223435D1 (de) 1998-01-22
EP0507411A1 (de) 1992-10-07
ATE161056T1 (de) 1997-12-15
ES2111035T3 (es) 1998-03-01
NL9100565A (nl) 1992-11-02

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