Global Patent Index - EP 1838891 B1

EP 1838891 B1 20151209 - HIGH STRENGTH SHEET MADE FROM AL-ZN-CU-MG ALLOY WITH LOW INTERNAL STRESSES

Title (en)

HIGH STRENGTH SHEET MADE FROM AL-ZN-CU-MG ALLOY WITH LOW INTERNAL STRESSES

Title (de)

GROBBLECH AUS AL-ZN-CU-MG LEGIERUNG MIT NIEDRIGEN INTERNEN DRÜCKEN

Title (fr)

TOLES FORTES EN ALLIAGE Al-Zn-Cu-Mg A FAIBLES CONTRAINTES INTERNES

Publication

EP 1838891 B1 20151209 (FR)

Application

EP 05825980 A 20051209

Priority

  • FR 2005003090 W 20051209
  • FR 0413204 A 20041213

Abstract (en)

[origin: WO2006064113A1] The invention relates to a method for production of thick sheets made from Al-Zn-Cu-Mg type alloys, comprising 4 to 12 % zinc, less than 4 % magnesium, less than 4 % copper, trace elements = 0.5 % each, the remainder being aluminium, said method comprising hot lamination, placing in solution, quenching, controlled drawing with a permanent extension of more than 0.5 % and aging, characterised in that the time D between the end of the quench and the beginning of the controlled drawing is less than 2 hours.

IPC 8 full level

C22F 1/05 (2006.01); C22C 21/10 (2006.01)

CPC (source: EP US)

C22C 21/10 (2013.01 - EP US); C22F 1/053 (2013.01 - EP US)

Citation (opposition)

Opponent : Aleris Rolled Products Germany GmbH

  • US 2002162609 A1 20021107 - WARNER TIMOTHY [US]
  • US 6406567 B1 20020618 - HASZLER ALFRED JOHANN PETER [DE], et al
  • J.T. STALEY ET AL.: "Heat treating Characteristics of High Strength Al-Zn-Mg-Cu Alloys With and Without Silver Additions.", METALLURGICAL TRANSACTIONS, vol. 3, January 1972 (1972-01-01), pages 191 - 199, XP055306959
  • "Aluminum and Aluminum Alloys", ASM SPECIALTY HANDBOOK, pages p. 305 and p.317
  • Q. WANG ET AL.: "Evaluation of residual stress relief of aluminum alloy 7050 by using crack compliance method.", TRANS. NONFERROUS MET. SOC. CHINA, vol. 13, no. 5, October 2003 (2003-10-01), pages 1190 - 1193, XP055306962
  • Q.WANG ET AL.: "Control and relief of residual stress in high-strength aluminum parts for aerospace industry.", JOURNAL OF AERONAUTICAL MATERIALS, vol. 11, no. 3, September 2002 (2002-09-01), pages 59 - 62, XP055306969
  • P. LEQUEU ET AL.: "Engineering for the future: weight saving and cost reduction initiatives.", AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, vol. 72, no. 2, 2001, pages 147 - 159, XP055306971
  • A. HYODO ET AL.: "Empenamento em peças usinada a partir de placas laminadas de ligas de aluminio da série 7xxx.", CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIALS, vol. 14, 2000, São Pedro-SP, Anais, pages 42801 - 42812
  • TRANSLATION INTO ENGLISH OF D8A
  • ALEXANDRE HYODO: "Influencia da tensão residual no empenament de peças aer- onauticas usinadas a partir de placas laminadas de ligas de aluminio da série 7xxx.", THESIS BEFORE THE UNIVERSIDADE FEDERAL DE SÃO CARLOS, 2002, XP055306992
  • F. HEYMES ET AL.: "Development of new Al alloys for distortion free machined aluminium aircraft components.'';", PROCEEDINGS OF THE 1ST INTERNATIONAL NON- FERROUS PROCESSING AND TECHNOLOGY CONFERENCE, March 1997 (1997-03-01), pages 249 - 255
  • R.V. LENTH: "Some practical guidelines for effective sample size determination.", THE AMERICAN STATISTICIAN, vol. 55, no. 3, August 2001 (2001-08-01), pages 187 - 193, XP055307002
  • DECLARATION BY DR PHILIPPE LEQUEU, 21 April 2009 (2009-04-21)

Opponent : Dr. Ernst Ulrich Wittmann

  • FR 413204 A 19100803 - POHLIG AKTIEN GES J [DE]
  • WO 2006064113 A1 20060622 - ALCAN RHENALU [FR], et al
  • US 2002121319 A1 20020905 - CHAKRABARTI DHRUBA J [US], et al
  • US 5865911 A 19990202 - MIYASATO SHELLY M [US], et al
  • US 4511409 A 19850416 - FERTON DANIEL [FR], et al
  • US 5277719 A 19940111 - KUHLMAN G WILLIAM [US], et al
  • US 6027582 A 20000222 - SHAHANI RAVI [FR], et al
  • EP 0848073 A1 19980617 - HOOGOVENS ALU WALZPROD GMBH [DE]
  • WO 2004053180 A2 20040624 - PECHINEY RHENALU [FR], et al
  • US 2002162609 A1 20021107 - WARNER TIMOTHY [US]
  • DECLARATION OF INVENTOR PHILIPPE LEQUEU, WHICH WAS FILED DURING THE EXAMINATION PROCEEDINGS AS X1, 28 November 2013 (2013-11-28)
  • "International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys", UNIFIED NORTH AMERICAN AND INTERNATIONAL REGISTRATION RECORDS, THE ALUMINUM ASSOCIATION, vol. 900, 1998, 19th Street, N.W., Washington , D.C. 20008, pages 27
  • "Aluminium et alliages d'aluminium - Produits corroyés - Désignation des états métallurgiques", NORME EUROPEENNE EN 515
  • "Heat Treating", ASM HANDBOOK, vol. 4, 1991
  • JOHN E., ALUMINUM - PHYSICAL PROPERTIES AND PHYSICAL METALLURGY, 1984, Ohio
  • J. R. DAVIS: "Aluminum and Aluminum Alloys", ASM SPECIALTY HANDBOOK, 1993
  • ALUMINUM STANDARDS AND DATA 2003, 2003
  • M. J. KIEMELE ET AL., BASIC STATISTICS - TOOLS FOR CONTINUOUS IMPROVEMENT, 2000, Colorado, USA, XP055307118
  • PRODUCTION PART APPROVAL PROCESS PPAP, 2000
  • "Aerospace Material Specification 4202 for Aluminum Alloy Plate 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (7475-T7351", SAE AEROSPACE
  • ALEXANDRE HYODO, INFLUENCE OF RESIDUAL STRESS ON THE WARPING OF AIRCRAFT PARTS MACHINED FROM SERIES 7XXX ALUMINIUM ALLOYS ROLLED PLATES, 2002, São Carlos
  • F. HEYMES ET AL.: "Development of New Al Alloys for Distortion Free Machined Aluminium Aircraft Components", PROCEEDINGS OF THE 1ST INTERNATIONAL NON-FERROUS PROCESSING AND TECHNOLOGY CONFERENCE, 10 March 1997 (1997-03-10), St. Louis, Missouri, XP055307116
  • P. LEQUEU ET AL.: "Engineering for the future: weight saving and cost reduction initiatives'';", AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, vol. 73, no. 2, 2001, pages 147 - 159, XP055306971
  • M. B. PRIME ET AL.: "Residual stress, stress relief, and inhomogeneity in aluminum plate", SCRIPTA MATERIALIA, vol. 46, 2002, pages 77 - 82, XP004326269
  • R. V. LENTH: "Some practical guidelines for effective sample size determination", THE AMERICAN STATISTICIAN, vol. 55, no. 3, 2001, pages 187 - 193, XP055307002

Opponent : anonymous

  • US 11299683 P
  • US 2002121319 A1 20020905 - CHAKRABARTI DHRUBA J [US], et al
  • EP 1158068 A1 20011128 - PECHINEY RHENALU [FR]
  • US 2002162609 A1 20021107 - WARNER TIMOTHY [US]
  • "Metallic Materials and Elements For Aerospace Vehicle Structures", DEPARTMENT OF DEFENSE HANDBOOK, vol. MIL-HDBK, 31 January 2003 (2003-01-31)
  • J. T. STALEY ET AL.: "Heat Treating Characteristics of High Strength Al-Zn-Mg- Cu Alloys With and Without Silver Additions", METALLURGICAL TRANSACTIONS, 3 January 1972 (1972-01-03), pages 191 - 199, XP008036306, DOI: doi:10.1016/0001-6160(72)90180-0
  • "Metals Handbook", HEAT TREATING, vol. 4, no. Ninth Edition, 1981
  • F. HEYMES ET AL.: "Development of New Al Alloys for Distortion Free Machined Aluminum Aircraft Components", PROCEEDINGS OF THE 1ST INTERNATIONAL NON- FERROUS PROCESSING AND TECHNOLOGY CONFERENCE, 10 March 1997 (1997-03-10), St . Louis, Missouri, pages 249 - 255
  • R.E. DAVIES ET AL.: "Design Mechanical Properties, Fracture Toughness, Fatigue Properties, Exfoliation and Stress-Corrosion Resistance of 7050 Sheet, Plate", HAND FORGINGS AND EXTRUSIONS, July 1975 (1975-07-01)
  • MILITARY SPECIFICATION HEAT TREATMENT OF ALUMINUM ALLOYS, MIL-H-6088G, 1 April 1991 (1991-04-01)
  • P. LEQUEU ET AL.: "Engineering for the future: weight saving and cost reduction initiatives", AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, vol. 73, no. 2, 2001, pages 147 - 159, XP055306971, DOI: doi:10.1108/00022660110386663
  • JIN HUANG, THE EFFECT OF PRE-DEFORMATION ON THE AGEING BEHAVIOUR OF 7030.60 AND 7108.82 ALLOYS, March 1999 (1999-03-01)
  • J.R . DAVIS, ASM SPECIALTY HANDBOOK, ALUMINUM AND ALUMINUM ALLOYS, 1993

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DOCDB simple family (publication)

FR 2879217 A1 20060616; FR 2879217 B1 20070119; CN 101076613 A 20071121; EP 1838891 A1 20071003; EP 1838891 B1 20151209; US 2006151075 A1 20060713; WO 2006064113 A1 20060622

DOCDB simple family (application)

FR 0413204 A 20041213; CN 200580042747 A 20051209; EP 05825980 A 20051209; FR 2005003090 W 20051209; US 29968305 A 20051213