Global Patent Index - EP 3807434 B1

EP 3807434 B1 20220914 - METHOD OF MANUFACTURING A 7XXX-SERIES ALUMINIUM ALLOY PLATE PRODUCT HAVING IMPROVED FATIGUE FAILURE RESISTANCE

Title (en)

METHOD OF MANUFACTURING A 7XXX-SERIES ALUMINIUM ALLOY PLATE PRODUCT HAVING IMPROVED FATIGUE FAILURE RESISTANCE

Title (de)

VERFAHREN ZUR HERSTELLUNG EINES PLATTENPRODUKTS AUS ALUMINIUMLEGIERUNG DER SERIE 7XXX MIT VERBESSERTER ERMÜDUNGSBRUCHFESTIGKEIT

Title (fr)

PROCÉDÉ DE FABRICATION D'UN PRODUIT PLAT EN ALLIAGE D'ALUMINIUM DE SÉRIE 7XXX PRÉSENTANT UNE MEILLEURE RÉSISTANCE À LA RUPTURE PAR FATIGUE

Publication

EP 3807434 B1 20220914 (EN)

Application

EP 19729715 A 20190605

Priority

  • EP 18177389 A 20180612
  • EP 2019064719 W 20190605

Abstract (en)

[origin: WO2019238509A1] The invention relates to a method of manufacturing an 7xxx-seriesaluminium alloy plate product having improved fatigue failure resistance, the method comprising the steps of (a) casting an ingot made of an aluminium alloy of the 7xxx-series comprising (in wt.%): Zn 5 to 9, Mg 1 to 3, Cu 0 to 3,balance aluminium and incidental elements and impurities;(b) homogenizing and/or preheating the cast ingot; (c) hot rolling the ingot into a plate product by rolling the ingot with multiple rolling passes, characterized in that when the intermediate thickness of the plate is between 80 and 220 mm,at least a high reduction hot rolling pass is carried out with a thickness reduction of at least 25%,wherein the plate product has a final thickness of less than 75 mm. The invention is also related to an aluminium alloy plate product and an aerospace structural member produced by this method.

IPC 8 full level

C22C 21/10 (2006.01); C22F 1/053 (2006.01)

CPC (source: EP KR RU US)

B22D 7/005 (2013.01 - US); C21D 8/0226 (2013.01 - US); C21D 9/46 (2013.01 - US); C22C 21/10 (2013.01 - EP KR RU US); C22F 1/053 (2013.01 - EP KR RU)

Citation (opposition)

Opponent : Arconic Corporation

  • JP 2000119782 A 20000425 - KOBE STEEL LTD
  • US 5221377 A 19930622 - HUNT JR WARREN H [US], et al
  • US 2012085470 A1 20120412 - SEGAL VLADIMIR M [US]
  • SRIVATSAN T.S, ANAND S, SRIRAM S, VASUDEVAN V.K: "The high-cycle fatigue and fracture behavior of aluminum alloy 7055", MATERIALS SCIENCE, ELSEVIER, AMSTERDAM, NL, vol. 281, no. 1-2, 1 April 2000 (2000-04-01), AMSTERDAM, NL, pages 292 - 304, XP093126962, ISSN: 0921-5093, DOI: 10.1016/S0921-5093(99)00716-9
  • ROMETSCH PAUL A., ZHANG YONG, KNIGHT STEVEN: "Heat treatment of 7xxx series aluminium alloys—Some recent developments", TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, ELSEVIER, AMSTERDAM, NL, vol. 24, no. 7, 1 July 2014 (2014-07-01), AMSTERDAM, NL , pages 2003 - 2017, XP093109094, ISSN: 1003-6326, DOI: 10.1016/S1003-6326(14)63306-9
  • GEORGE E. TOTTEN, KIYOSHI FUNATANI, LIN XIE: "Handbook of Metallurgical Process Design", 1 January 2004, MARCEL DEKKER, INC., USA, ISBN: 0-8247-4106-4, article JULIAN H. DRIVER, OLAF ENGLER: "Design of Aluminum Rolling Processes for Foil, Sheet, and Plate", pages: 69 - 114, XP009552727
  • ZYGMUNT WUSATOWSKI: "Fundamentals of Rolling ", 1 January 1969, PERGAMON PRESS, ISBN: 978-0-08-012276-2, article ZYGMUNT WUSATOWSKI: "CHAPTER 3 - FUNDAMENTALS OF ROLLING PROCESSES", pages: 69 - 202, XP009552626, DOI: 10.1016/B978-0-08-012276-2.50008-6
  • ANONYMOUS: "Rolling Aluminum: From the Mine Through the Mill (3rd Edition)", 1 January 2008, THE ALUMINUM ASSOCIATION, INC., article ANONYMOUS: "3.6 DC Ingot Casting", pages: 3.6 - 3.7, XP009552879
  • "Rolling Aluminum: From the Mine Through the Mill (3rd Edition)", 1 January 2008, THE ALUMINUM ASSOCIATION, INC., article ANONYMOUS: "6.2 Solution Heat Treatment: "Soaking" / Quenching", pages: 6.2 - 6.2, XP009552880
  • ANONYMOUS: "International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys", REGISTRATION RECORD SERIES TEAL SHEETS; THE ALUMINUM ASSOCIATION, 1 January 2015 (2015-01-01), XP093126972, [retrieved on 20240202]
  • ANONYMOUS: "METALLIC MATERIALS AND ELEMENTS FOR AEROSPACE VEHICLE STRUCTURES", 31 January 2003, DEPARTMENT OF DEFENSE, article ANONYMOUS: "3.7.5 7055 ALLOY", pages: 3 - 3-367, XP009552885
  • ANONYMOUS: "AIMS Airbus Material Specification - Aluminium alloy (7055) Solution treated, controlled stretched and artificially aged (T7951) High Fatigue Age formable 25,0 mm < a < 40,0 mm Close-tolerance flatness", AIRBUS, no. 1, 1 June 2003 (2003-06-01), XP093126983
  • ANONYMOUS: "AIMS Airbus Industrie Material Specification - Aluminium alloy (7055) Solution treated, controlled stretched and artificially aged (T7951) Age formable Plate 19,0 mm < a < 40,0 mm Close-tolerance flatness", AIRBUS INDUSTRIE, 1 February 2002 (2002-02-01), XP093126985

Opponent : [C-TEC CONSTELLIUM TECHNOLOGY CENTER, CONSTELLIUM ISSOIRE]

  • JP H11140610 A 19990525 - FURUKAWA ELECTRIC CO LTD
  • JP 2007182628 A 20070719 - KOBE STEEL LTD
  • EP 0686705 A1 19951213 - HOOGOVENS ALU WALZPROD GMBH [DE]
  • FR 2715408 A1 19950728 - PECHINEY RHENALU [FR]
  • EP 1420896 B1 20070411 - CORUS TECHNOLOGY BV [NL]
  • EP 3115474 A1 20170111 - UACJ CORP [JP]
  • US 5221377 A 19930622 - HUNT JR WARREN H [US], et al
  • US 7097719 B2 20060829 - BRAY GARY H [US], et al
  • WANG A., THOMSON P.F., HODGSON P.D.: "A study of pore closure and welding in hot rolling process", JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, ELSEVIER, NL, vol. 60, no. 1-4, 1 June 1996 (1996-06-01), NL , pages 95 - 102, XP093114567, ISSN: 0924-0136, DOI: 10.1016/0924-0136(96)02313-8
  • WANG HAI XIONG, LI JI BIN, LIU HAI JUN, WANG CHANG SHENG: "Research on Aluminum Plate Reversible Hot-Rolling Mathematical Model and Schedule", APPLIED MECHANICS AND MATERIALS, SCIENTIFIC.NET, CH, vol. 157-158, CH , pages 719 - 726, XP093114565, ISSN: 1662-7482, DOI: 10.4028/www.scientific.net/AMM.157-158.719
  • JAMET MARC, YVES DOREMUS: " Mise en forme de l’aluminium - Laminage", TECHNIQUES DE L’INGÉNIEUR, 10 September 1997 (1997-09-10), XP093114564, [retrieved on 20231221]
  • "The Aluminum Association", 1 December 2007, article ANONYMOUS: "Rolling Aluminun - From the mine through the mill", XP093114558

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 2019238509 A1 20191219; BR 112020023249 A2 20210223; CA 3100242 A1 20191219; CA 3100242 C 20230808; CN 112262223 A 20210122; CN 112262223 B 20230214; EP 3807434 A1 20210421; EP 3807434 B1 20220914; ES 2929839 T3 20221202; JP 2021526591 A 20211007; JP 7282106 B2 20230526; KR 102547038 B1 20230626; KR 20210020992 A 20210224; PT 3807434 T 20221006; RU 2757280 C1 20211012; US 2021246523 A1 20210812

DOCDB simple family (application)

EP 2019064719 W 20190605; BR 112020023249 A 20190605; CA 3100242 A 20190605; CN 201980039243 A 20190605; EP 19729715 A 20190605; ES 19729715 T 20190605; JP 2020569182 A 20190605; KR 20217000323 A 20190605; PT 19729715 T 20190605; RU 2020140617 A 20190605; US 201916973980 A 20190605