EP0394818A1 - Rolled aluminium product and process for its production - Google Patents

Rolled aluminium product and process for its production Download PDF

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Publication number
EP0394818A1
EP0394818A1 EP90107322A EP90107322A EP0394818A1 EP 0394818 A1 EP0394818 A1 EP 0394818A1 EP 90107322 A EP90107322 A EP 90107322A EP 90107322 A EP90107322 A EP 90107322A EP 0394818 A1 EP0394818 A1 EP 0394818A1
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Prior art keywords
weight
tape
hours
temperature
intermetallic phases
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EP90107322A
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German (de)
French (fr)
Inventor
Jochen Dr. Hasenclever
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Vaw Aluminium AG
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Vereinigte Aluminium Werke AG
Vaw Aluminium AG
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Publication of EP0394818A1 publication Critical patent/EP0394818A1/en
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    • 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 an aluminum thin strip made of an alloy containing iron, manganese and silicon, which at the same time has high strength values and high elongation values, and a method for its production.
  • the object of the present invention is to produce an aluminum thin strip from an AlFeMn alloy which at the same time has good strength properties at high elongation values and can be produced in a simple manner.
  • the thermally activated rearrangement of the dislocations caused by the previous deformation takes place in lower energy arrangements, mainly to small-angle grain boundaries, which form the boundaries of subgrains.
  • the properties of the rolled product according to the invention can advantageously be found in the packaging market, e.g. for flat belt, or also in cooler construction for lamellar belt, etc. Use purposes.
  • At least one of the elements mentioned in claim 2 is added to the alloy according to claim 1.
  • Hot rolling was carried out as usual at 4 mm hot strip end thickness, whereupon cold rolling was carried out at 0.1 mm without intermediate annealing.
  • the continuous cast ingot was homogenized at a temperature of 550 ° C for 7 hours.
  • the result was a structure which had less than 3% by volume of rod-shaped intermetallic phases.
  • Fig. 1 the back glow behavior of the mechanical values is shown in a schematic representation.
  • the strength values are plotted against the annealing temperature, curve 1 showing the stretch and curve 2 showing the yield strength after conventional production (see, for example, FIG. 1 of Alcan patent DE 24 23 597 and the corresponding strength values according to DIN 1788, February 1983 edition).

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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)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)

Abstract

Aluminium product and process for its production …<??>It is intended to produce thin aluminium tape which has good strength properties at great elongations and can be used in a simple manner. …<??>It is characterised by the following alloy composition:… Fe: 0.7 - 1.15% by weight… Mn: 0.5 - 2.0% by weight… Si: < 0.6% by weight… remainder aluminium and impurities, each in an amount of max. 0.03% by weight,… and a subparticle microstructure having a mean particle diameter of 0.5 - 5 mu m, the subparticles accounting for at least 50% of the total microstructure,… and in addition at least one of the following alloy elements:… Mg: 0.1 - 0.8% by weight… Cu: 0.1 - 0.3% by weight… Zr: 0.01 - 0.20% by weight. …<??>The thin aluminium tape is produced by continuous casting, in which round intermetallic phases are finely dispersed with a volume fraction of rod-shaped intermetallic phases of < 5% by volume, the casting rod is homogenised at a temperature of 620 to 480 DEG C for 2 to 20 hours and hot-rolled to a final thickness of 4 mm, after which cold-rolling is carried out to a final thickness of 40 to 250 mu m without intermediate annealing, and the cold-rolled tape is annealed at a temperature of 250 to 400 DEG C for 1 to 6 hours. …<??>This process makes it possible to achieve an advantageous combination of strength and elongation properties. …<??>The product is used in particular in the packaging industry or as lamellar tape in radiator construction.

Description

Die Erfindung betrifft ein Aluminiumdünnband aus einer Legie­rung, enthaltend Eisen, Mangan und Silizium, das gleichzeitig hohe Festigkeitswerte und hohe Dehnungswerte aufweist sowie ein Verfahren zu seiner Herstellung.The invention relates to an aluminum thin strip made of an alloy containing iron, manganese and silicon, which at the same time has high strength values and high elongation values, and a method for its production.

Aus der DE-PS 24 23 597 (Alcan) ist ein Verfahren zur Herstel­lung von dispersionsverfestigten Aluminiumlegierungsblechen und -folien bekannt, das bei einer Aluminiumlegierung mit 1,65 % Eisen, 0,95 % Mangan, 0,09 % Silizium, sonstige Verunreinigungen bis zu je 0,01 % eine Zugfestigkeit von 175 N/mm², eine 0,2-­Streckgrenze von 168 N/mm² und eine Dehnung von 15 % nach einem Glühen bei 300 °C aufweist (s. Tabelle 2, Nr. 1). Hierzu ist es aber erforderlich, daß ein Gußblock 5,0 bis 20 Vol.-% nicht aus­gerichteter stabartiger intermetallischer Phasen mit einem durch­schnittlichen Durchmesser von 0,1 bis 1,5 µm hergestellt wird. Die intermetallischen Phasen müssen bei der anschließenden Quer­schnittsreduzierung in sehr feine Teilchen zerbrochen werden.From DE-PS 24 23 597 (Alcan) a process for the production of dispersion-strengthened aluminum alloy sheets and foils is known which, in the case of an aluminum alloy with 1.65% iron, 0.95% manganese, 0.09% silicon, other impurities 0.01% each has a tensile strength of 175 N / mm², a 0.2 yield strength of 168 N / mm² and an elongation of 15% after annealing at 300 ° C (see Table 2, No. 1). However, this requires that a cast block of 5.0 to 20% by volume of non-aligned rod-like intermetallic phases with an average diameter of 0.1 to 1.5 µm be produced. The intermetallic phases have to be broken down into very fine particles during the subsequent cross-sectional reduction.

Aus DE-PS 33 30 814 (Schweizerische Aluminium AG) ist ein Ver­fahren zur Herstellung von Aluminiumwalzprodukten mit den Legie­rungselementen Eisen, Mangan, Silizium bekannt, daß nach einem Abwalzgrad von mindestens 60 % und einer Glühung bei mindestens 250 °C eine Korngröße von weniger als 10 µm aufweist. Die mit diesem Verfahren erreichbaren Festigkeitswerte liegen bei 125 MPa für die Zugfestigkeit, 80 MPa für die 0,2 %-Streckgrenze und 28 % für die Dehnung (Beispiel 4).From DE-PS 33 30 814 (Schweizerische Aluminum AG) a process for the production of rolled aluminum products with the alloying elements iron, manganese, silicon is known that after a rolling degree of at least 60% and an annealing at at least 250 ° C., a grain size of less than 10 µm. The strength values that can be achieved with this method are 125 MPa for the tensile strength, 80 MPa for the 0.2% yield strength and 28% for the elongation (Example 4).

Aufgabe der vorliegenden Erfindung ist es, ein Aluminiumdünnband aus einer AlFeMn-Legierung herzustellen, das bei hohen Dehnungs­werten gleichzeitig gute Festigkeitseigenschaften aufweist und in einfacher Weise herstellbar ist.The object of the present invention is to produce an aluminum thin strip from an AlFeMn alloy which at the same time has good strength properties at high elongation values and can be produced in a simple manner.

Erfindungsgemäß wird dies durch die in den Patentansprüchen angegebenen Merkmale erreicht. Es hat sich gezeigt, daß sich bei Einhaltung der Legierungsgrenzen für Eisen, Mangan, Silizium und der sonstigen Verunreinigungen in Verbindung mit der speziellen Homogenisierung und Walzprozedur mit anschließender Endglühung in überraschender Weise vorteilhafte Kombination aus Festig­keits- und Dehnungseigenschaften erreichen lassen.According to the invention, this is achieved by the features specified in the patent claims. It has been shown that if the alloy limits for iron, manganese, silicon and the other impurities are observed in connection with the special homogenization and rolling procedure with subsequent final annealing, an advantageous combination of strength and elongation properties can be achieved in a surprising manner.

Bei der Endglühung erfolgt die thermisch aktivierte Umordnung der durch die vorhergehende Verformung entstandenen Versetzungen in Anordnungen niedrigerer Energie, hauptsächlich zu Kleinwin­kelkorngrenzen, die die Grenzen von Subkörnern bilden.In the final annealing, the thermally activated rearrangement of the dislocations caused by the previous deformation takes place in lower energy arrangements, mainly to small-angle grain boundaries, which form the boundaries of subgrains.

Die Eigenschaften des erfindungsgemäßen Walzproduktes lassen sich vorteilhafterweise im Verpackungsmarkt, z.B. für Plates­band, oder auch im Kühlerbau für Lamellenband u.ä. Zwecke nutzen.The properties of the rolled product according to the invention can advantageously be found in the packaging market, e.g. for flat belt, or also in cooler construction for lamellar belt, etc. Use purposes.

Zur weiteren Steigerung der Festigkeit wird mindestens eines der im Anspruch 2 genannte Elemente zur Legierung gemäß Anspruch 1 zugesetzt.To further increase the strength, at least one of the elements mentioned in claim 2 is added to the alloy according to claim 1.

Im folgenden wird die Erfindung anhand mehrerer Ausführungsbei­spiele näher erläutert. Das Rückglühverhalten der mechanischen Werte wird in Fig. 1 schematisch dargestellt.The invention is explained in more detail below with the aid of several exemplary embodiments. The back-heating behavior of the mechanical values is shown schematically in FIG. 1.

1. Ein Stranggußbarren aus
Si = 0,12 Gew.-%
Fe = 1,0 Gew.-%
Mn = 1,0 Gew.-%
sonstige Elemente <0,02 Gew.-%
Rest Aluminium
wird im Format 100 x 300 x 500 mm gegossen und bei einer Temperatur von 550 °C für 7 Stunden homogenisiert. Danach lagen die Volumenanteile an stäbchenförmigen intermetallischen Phasen unterhalb von 5 %.1. A continuous cast ingot
Si = 0.12% by weight
Fe = 1.0% by weight
Mn = 1.0% by weight
other elements <0.02% by weight
Rest aluminum
is cast in the format 100 x 300 x 500 mm and homogenized at a temperature of 550 ° C for 7 hours. Thereafter, the volume proportions of rod-shaped intermetallic phases were below 5%.

Das Warmwalzen erfolgte wie üblich an 4 mm Warmbandenddicke, woraufhin ein Kaltwalzen ohne Zwischenglühung an 0,1 mm durchgeführt wurde. Es wurden folgende Festigkeitswerte in Walzrichtung gemessen (s. DIN 50145):
Rm = 164 N/mm²
Rp0,2 = 146 N/mm²
A₂₅ = 15,0 %.Hot rolling was carried out as usual at 4 mm hot strip end thickness, whereupon cold rolling was carried out at 0.1 mm without intermediate annealing. The following strength values were measured in the rolling direction (see DIN 50145):
R m = 164 N / mm²
R p0.2 = 146 N / mm²
A₂₅ = 15.0%.

Ein Stranggußbarren gleicher Zusammensetzung wurde bei einer Temperatur von 610 °C für 15 Stunden homogenisiert und an­schließend wie oben warm und kaltgewalzt. Die Endglühung er­folgte bei 310 °C für eine Stunde und ergab folgende Festig­keitswerte:
Rm = 150 N/mm²,
Rp0,2 = 120 N/mm²,
A₂₅ = 22,5 %.A continuous cast ingot of the same composition was homogenized at a temperature of 610 ° C for 15 hours and then hot and cold rolled as above. The final annealing was carried out at 310 ° C for one hour and gave the following strength values:
R m = 150 N / mm²,
R p0.2 = 120 N / mm²,
A₂₅ = 22.5%.

2. Danach wurde ein Stranggußbarren mit folgender Zusammensetzung hergestellt:
Si = 0,12 Gew.-%,
Fe = 1,0 Gew.-%,
Mn = 0,60 Gew.-%,
sonstige Elemente <0,02 Gew.-%,
Rest Alumlnium.2. A continuous cast ingot was then produced with the following composition:
Si = 0.12% by weight,
Fe = 1.0% by weight,
Mn = 0.60% by weight,
other elements <0.02% by weight,
Remainder aluminum.

Der Stranggußbarren wurde bei einer Temperatur von 550 °C für 7 Stunden homogenisiert. Dabei ergab sich ein Gefüge, das weniger als 3 Vol.-% stäbchenförmige intermetallische Phasen aufwies. Nach Durchführung der o.g. Walzprozedur wurde das Material bei 350 °C für 1 Stunde geglüht und wies danach folgende Festigkeitswerte auf:
Rm = 132 N/mm²,
Rp0,2 = 92 N/mm²,
A₂₅ = 24 %.The continuous cast ingot was homogenized at a temperature of 550 ° C for 7 hours. The result was a structure which had less than 3% by volume of rod-shaped intermetallic phases. After carrying out the above-mentioned rolling procedure, the material was annealed at 350 ° C for 1 hour and then had the following strength values:
R m = 132 N / mm²,
R p0.2 = 92 N / mm²,
A₂₅ = 24%.

3. Ein Stranggußbarren aus 0,12 Gew.-% Silizium, 1,0 Gew.-% Eisen, 1,0 Gew.-% Mangan, 0,5 Gew.-% Magnesium und weniger als 0,02 Gew.-% sonstige Elemente, Rest Aluminlum wurde bei einer Temperatur von 550 °C für 7 Stunden homogenisiert. Das Gefüge wies dananch weniger als 2 Vol.-% stäbchenförmige intermetallische Phasen auf. Nach Durchführung der eingangs genannten Walzprozedur wurde das Material bei 260 °C für eine Stunde geglüht und wies danach folgende Festigkeits­werte auf:
Rm = 188 N/mm²,
Rp0,2 = 177 N/mm²,
A₂₅ = 14,0 %.3. A continuous cast ingot made of 0.12% by weight silicon, 1.0% by weight iron, 1.0% by weight manganese, 0.5% by weight magnesium and less than 0.02% by weight. other elements, remainder aluminum was homogenized at a temperature of 550 ° C. for 7 hours. The structure then had less than 2% by volume of rod-shaped intermetallic phases. After carrying out the rolling procedure mentioned at the outset, the material was annealed at 260 ° C for one hour and then had the following strength values:
R m = 188 N / mm²,
R p0.2 = 177 N / mm²,
A₂₅ = 14.0%.

In Fig. 1 ist das Rückglühverhalten der mechanischen Werte in schematischer Darstellung gezeigt. Es sind die Festigkeitswerte über der Glühtemperatur aufgetragen, wobei der Kurvenverlauf 1 den Verlauf der Dehnung und die Kurve 2 den Verlauf der Streck­grenze nach herkömmlicher Fertigung zeigen (s. beispielsweise Fig. 1 des Alcan-Patentes DE 24 23 597 und die entsprechenden Festigkeitswerte nach DIN 1788, Ausgabe Febr. 1983).In Fig. 1, the back glow behavior of the mechanical values is shown in a schematic representation. The strength values are plotted against the annealing temperature, curve 1 showing the stretch and curve 2 showing the yield strength after conventional production (see, for example, FIG. 1 of Alcan patent DE 24 23 597 and the corresponding strength values according to DIN 1788, February 1983 edition).

Die Kurve 3 zeigt den Verlauf der Dehnung bei einem Aluminium­halbzeug gemäß vorliegender Erfindung. Man erkennt, daß inner­halb eines relativ weiten Glühbereiches Δ T = 10-50 ° beim erfindungsgemäßen Produkt sowohl die Festigkeit (kurve 2) als auch die Dehnung (Kurve 3) auf einem hohen Niveau liegen. Der erfindungsgemäße Bereich ist in dem schraffierten Feld angedeutet.Curve 3 shows the course of the elongation in the case of an aluminum semi-finished product according to the present invention. It can be seen that both the strength (curve 2) and the elongation (curve 3) are at a high level within a relatively wide annealing range Δ T = 10-50 ° in the product according to the invention. The area according to the invention is indicated in the hatched field.

Claims (3)

1. Aluminiumdünnband , enthaltend Eisen, Mangan und Silizium, gekennzeichnet durch folgende Legierungszusammensetzung:
Fe: 0,7 - 1,15 Gew.-%,
Mn: 0,5 - 2,0 Gew.-%,
Si: < 0,6 Gew.-%,
Rest Aluminium, sowie Verunreinigungen mit je max 0,03 Gew.-%
und ferner gekennzeichnet durch ein Subkorngefüge mit einem mittleren Korndurchmesser von 0,5-5 µm, wobei die Subkörner mindestens 50 % des Gesamtgefüges ausmachen.1. Aluminum thin strip containing iron, manganese and silicon, characterized by the following alloy composition:
Fe: 0.7 - 1.15% by weight,
Mn: 0.5-2.0% by weight,
Si: <0.6% by weight,
Remainder aluminum, as well as impurities with max. 0.03 wt.% Each
and further characterized by a subgrain structure with an average grain diameter of 0.5-5 µm, the subgrains accounting for at least 50% of the total structure. 2. Aluminiumdünnband nach Anspruch 1, dadurch gekennzeichnet, daß es zusätzlich mindestens eines der folgenden Legierungs­elemente aufweist:
Mg: 0,1 - 0,8 Gew.-%,
Cu: 0,1 - 0,3 Gew.-%,
Zr: 0,01 - 0,20 Gew.-%.2. Aluminum thin strip according to claim 1, characterized in that it additionally has at least one of the following alloy elements:
Mg: 0.1-0.8% by weight,
Cu: 0.1-0.3% by weight,
Zr: 0.01-0.20% by weight. 3. Verfahren zur Herstellung eines Aluminiumdünnbandes ent­haltend Eisen, Mangan und Silizium durch Warm- und Kalt­walzen mit anschließender Endglühung, dadurch gekennzeich­net, daß ein Barrens aus:
Fe: 0,7 - 1,15 Gew.-%,
Mn: 0,5 - 2,0 Gew.-%,
Si: <0,6 Gew.-%,
Verunreinigungen: bis zu je 0,03 Gew.%,
Rest Aluminium
durch Stranggießen hergestellt wird, wobei rundliche inter­metallische Phasen feindispers verteilt sind mit einem Volumenanteil an stäbchenförmigen intermetallischen Phasen <5 Vol.-%,
der Stranggußbarren bei einer Temperatur von 620 bis 480 °C für 2 bis 20 Stunden homogenisiert, danach in üblicher Weise an 4 mm Enddicke warmgewalzt wird, wonach ohne Zwischenglühung kaltgewalzt wird bis auf eine Enddicke von 40 bis 250 µm und das Kaltwalzband bei einer Temperatur von 250 bis 400 °C für 1 bis 6 Stunden geglüht wird.3. Process for producing an aluminum thin strip containing iron, manganese and silicon by hot and cold rolling with subsequent final annealing, characterized in that an ingot of:
Fe: 0.7 - 1.15% by weight,
Mn: 0.5-2.0% by weight,
Si: <0.6% by weight,
Impurities: up to 0.03% by weight each,
Rest aluminum
is produced by continuous casting, roundish intermetallic phases being finely dispersed with a volume fraction of rod-shaped intermetallic phases <5% by volume,
the continuous cast ingot is homogenized at a temperature of 620 to 480 ° C. for 2 to 20 hours, after which it is hot-rolled to a final thickness of 4 mm, after which cold rolling is carried out without intermediate annealing to a final thickness of 40 to 250 μm and the cold rolling strip is annealed at a temperature of 250 to 400 ° C. for 1 to 6 hours.
EP90107322A 1989-04-28 1990-04-18 Rolled aluminium product and process for its production Withdrawn EP0394818A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3914020A DE3914020A1 (en) 1989-04-28 1989-04-28 ALUMINUM ROLLING PRODUCT AND METHOD FOR THE PRODUCTION THEREOF
DE3914020 1989-04-28

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EP0394818A1 true EP0394818A1 (en) 1990-10-31

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CA (1) CA2015667A1 (en)
DE (1) DE3914020A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025825A1 (en) * 1994-03-18 1995-09-28 Alcan International Limited Aluminium foil
GB2301375A (en) * 1994-03-18 1996-12-04 Alcan Int Ltd Aluminium foil
NL1003401C2 (en) * 1996-06-24 1998-01-07 Hoogovens Aluminium Bv Prodn. of aluminium construction plates with good strength and elasticity

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US5169790A (en) * 1990-03-12 1992-12-08 Siemens Aktiengesellschaft Method of making thyristor having low reflection light-triggering structure
CA2104335C (en) * 1993-08-18 1999-03-16 Marcio Douglas Soares Aluminum foil product and manufacturing method
US5480498A (en) * 1994-05-20 1996-01-02 Reynolds Metals Company Method of making aluminum sheet product and product therefrom
US6423164B1 (en) 1995-11-17 2002-07-23 Reynolds Metals Company Method of making high strength aluminum sheet product and product therefrom
FR2813316B1 (en) * 2000-08-29 2002-10-18 Pechiney Rhenalu PROCESS FOR PRODUCING VERY THIN STRIPS OF ALUMINUM-IRON ALLOY
CN101525709B (en) * 2009-04-24 2010-08-11 安徽欣意电缆有限公司 High-elongation aluminum alloy material and preparation method thereof
JP5841719B2 (en) * 2010-11-30 2016-01-13 三菱アルミニウム株式会社 Aluminum alloy clad material
CN103789587A (en) * 2012-10-31 2014-05-14 湖南省邵东县新仁铝业有限责任公司 3120 aluminum alloy aluminum foil applied to air-conditioner radiating fin and processing process thereof
CN103071676A (en) * 2012-12-27 2013-05-01 西南铝业（集团）有限责任公司 Production process of aluminum base material used for curtain wall
CN113652579B (en) * 2021-08-20 2022-05-13 成都市新美加机械设备制造有限公司 Production process of aluminum foil for power battery

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DE1817243A1 (en) * 1967-12-29 1969-07-24 Alusuisse Process for the production of fine-grained strips from manganese-containing aluminum alloys
GB1178966A (en) * 1966-06-29 1970-01-28 Alcan Res & Dev Heat-Treatment of Aluminium-Manganese Alloys
FR2229779A1 (en) * 1973-05-17 1974-12-13 Alcan Res & Dev
FR2291285A1 (en) * 1974-11-15 1976-06-11 Alcan Res & Dev MANUFACTURING PROCESS FOR IMPROVED METAL ALLOY PRODUCTS
EP0140827A1 (en) * 1983-08-23 1985-05-08 Schweizerische Aluminium Ag Process for the manufacture of fine grain-textured aluminium rolling mill products

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GB1178966A (en) * 1966-06-29 1970-01-28 Alcan Res & Dev Heat-Treatment of Aluminium-Manganese Alloys
DE1817243A1 (en) * 1967-12-29 1969-07-24 Alusuisse Process for the production of fine-grained strips from manganese-containing aluminum alloys
FR2229779A1 (en) * 1973-05-17 1974-12-13 Alcan Res & Dev
FR2291285A1 (en) * 1974-11-15 1976-06-11 Alcan Res & Dev MANUFACTURING PROCESS FOR IMPROVED METAL ALLOY PRODUCTS
EP0140827A1 (en) * 1983-08-23 1985-05-08 Schweizerische Aluminium Ag Process for the manufacture of fine grain-textured aluminium rolling mill products

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Title
W. HUFNAGEL: "Aluminium Taschenbuch", 14 Auflage, Aluminium-Verlag, Düsseldorf, DE, 1983, Seiten 42-43, Absatz 2.1.2.2: "AlMn-Knetlegierungen", Seiten 1011-1018 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025825A1 (en) * 1994-03-18 1995-09-28 Alcan International Limited Aluminium foil
GB2301375A (en) * 1994-03-18 1996-12-04 Alcan Int Ltd Aluminium foil
GB2301375B (en) * 1994-03-18 1998-04-01 Alcan Int Ltd Aluminium foil
NL1003401C2 (en) * 1996-06-24 1998-01-07 Hoogovens Aluminium Bv Prodn. of aluminium construction plates with good strength and elasticity

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CA2015667A1 (en) 1990-10-28
US5080728A (en) 1992-01-14
DE3914020A1 (en) 1990-10-31

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