Global Patent Index - EP 2888383 B1

EP 2888383 B1 20160330 - ALUMINIUM ALLOY STRIP WHICH IS RESISTANT TO INTERCRYSTALLINE CORROSION AND METHOD FOR PRODUCING SAME

Title (en)

ALUMINIUM ALLOY STRIP WHICH IS RESISTANT TO INTERCRYSTALLINE CORROSION AND METHOD FOR PRODUCING SAME

Title (de)

HOCHUMFORMBARES UND IK-BESTÄNDIGES ALMG-BAND

Title (fr)

BANDE D'ALLIAGE EN ALUMINIUM RÉSISTANT À LA CORROSION INTERCRISTALLINE ET SON PROCÉDÉ DE FABRICATION

Publication

EP 2888383 B1 20160330 (DE)

Application

EP 13756053 A 20130822

Priority

  • EP 12181356 A 20120822
  • EP 2013064736 W 20130711
  • EP 2013067487 W 20130822
  • EP 13756053 A 20130822

Abstract (en)

[origin: WO2014029856A1] The invention relates to a cold-rolled aluminum alloy strip made of an AlMg aluminum alloy as well as a method for producing the same. Furthermore, adequate components made from said aluminum alloy strips are also disclosed. The aim of the invention is to design a single-layer aluminum alloy strip that is sufficiently resistant to intergranular corrosion and is nevertheless very easily malleable so that even large-area deep-drawn parts, e.g. interior parts of motor vehicle doors, can be made with sufficient strength. Said aim is achieved by an aluminum alloy strip made of an AlMg aluminum alloy which has the following alloying components: Si <= 0.2 wt.%, Fe <= 0.35 wt.%, Cu <= 0.15 wt.%, 0.2 wt.% <= Mn < 0.35 wt.%, 4.1 wt.% <= Mg <= 4.5 wt.%, Cr <= 0.1 wt.%, Zn <= 0.25 wt.%, Ti <= 0.1 wt.%, the remainder consisting of Al and inevitable impurities, each of which amounts to no more than 0.05 wt.% and the total amount of which amounts to no more than 0.15 wt.%. The aluminum alloy strip has a recrystallized structure, the average grain size of the structure ranges from 15 mum to 30 mum, preferably from 15mum to 25 mum, and the final soft annealing of the aluminum alloy strip is performed in a continuous furnace.

IPC 8 full level

C22C 21/06 (2006.01); C22F 1/047 (2006.01)

CPC (source: EP RU US)

C22C 21/00 (2013.01 - EP US); C22C 21/04 (2013.01 - RU); C22C 21/06 (2013.01 - EP US); C22C 21/08 (2013.01 - EP US); C22F 1/047 (2013.01 - EP US); C22F 1/047 (2013.01 - RU)

Citation (opposition)

Opponent : Aleris Aluminum Duffel BVBA against European Pate

  • EP 0818553 A1 19980114 - HOOGOVENS ALUMINIUM NV [BE]
  • EP 0259700 A1 19880316 - SKY ALUMINIUM [JP]
  • EP 0681034 A1 19951108 - FURUKAWA ELECTRIC CO LTD [JP]
  • JP S62207850 A 19870912 - SKY ALUMINIUM
  • US 4151013 A 19790424 - PRESTLEY JOHN S JR [US], et al
  • EP 0769564 B1 20011212 - PECHINEY RHENALU [FR]
  • L. RABET ET AL.: "Particle Stimulated Nucleation During Continuous Annealing Of A Cold Rolled AA5182 Alloy?", ICAA-5, MATERIALS SCIENCE FORUM, vol. 217-222, 1996, pages 465 - 470, XP055337024
  • LUC RABET: "Textuurontwikkeling tijdens de rekristallisatie van een koudvervormde Al-Mg legering voor automobieltoepassingen", KATHOLIEKE UNIVERSITEIT LEUVEN., March 1996 (1996-03-01), XP055339886
  • "Process for producing an AA5000 aluminum alloy sheet with excellent formability", RESEARCH DISCLOSURE 505004, vol. 505, no. 4, May 2006 (2006-05-01), XP007136144
  • "International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys", ALUMINIUM ASSOCIATION TEAL SHEETS, February 2009 (2009-02-01), pages 7 - 8, XP055136121

Opponent : Novelis, Inc.

  • STEFAN LANG: "Entwicklung einer neuen AIMg-Legierung fur Außenhaut- Karosseriebleche mit verbesserter Umformbarkeit", PHD THESIS, 1999, pages 44 - 49 , 78-79, 86-89, 130-133 and 182-183, XP055525920
  • STEFAN LANG: "Entwicklung einer neuen AIMg-Legierung fur Außenhaut- Karosseriebleche mit verbesserter Umformbarkeit", PHD THESIS, 1999, pages 1 - 197, XP055525920
  • T. KOMATSUBARA ET AL.: "New Al-Mg-Cu Alloys for Autobody Sheet Applications", SOCIETY OF AUTOMOTIVE ENGINEERS, INC., 1989, XP055525913

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

WO 2014029856 A1 20140227; CA 2882614 A1 20140227; CA 2882614 C 20180102; CN 104937120 A 20150923; CN 104937120 B 20171117; EP 2888383 A1 20150701; EP 2888383 B1 20160330; ES 2569945 T3 20160513; JP 2015532679 A 20151112; JP 5923665 B2 20160524; KR 101709289 B1 20170222; KR 20150076151 A 20150706; RU 2015110021 A 20161020; RU 2608931 C2 20170126; US 2015159250 A1 20150611

DOCDB simple family (application)

EP 2013067487 W 20130822; CA 2882614 A 20130822; CN 201380044183 A 20130822; EP 13756053 A 20130822; ES 13756053 T 20130822; JP 2015527926 A 20130822; KR 20157007194 A 20130822; RU 2015110021 A 20130822; US 201514624793 A 20150218