Global Patent Index - EP 3495520 B1

EP 3495520 B1 20230607 - LOW COST, SUBSTANTIALLY ZR-FREE ALUMINUM-LITHIUM ALLOY FOR THIN SHEET PRODUCT WITH HIGH FORMABILITY

Title (en)

LOW COST, SUBSTANTIALLY ZR-FREE ALUMINUM-LITHIUM ALLOY FOR THIN SHEET PRODUCT WITH HIGH FORMABILITY

Title (de)

KOSTENGÜNSTIGE, IM WESENTLICHEN ZR-FREIE ALUMINIUM-LITHIUM-LEGIERUNG FÜR DÜNNBLECH MIT HOHER FORMBARKEIT

Title (fr)

ALLIAGE ALUMINIUM-LITHIUM À FAIBLE COÛT ET SENSIBLEMENT SANS ZR POUR UN PRODUIT EN FEUILLE MINCE À HAUTE FORMABILITÉ

Publication

EP 3495520 B1 20230607 (EN)

Application

EP 18210045 A 20181204

Priority

US 201715830569 A 20171204

Abstract (en)

[origin: EP3495520A1] A low cost, substantially Zr-free, low density 2xxx aluminum-lithium alloy is disclosed. The aluminum-lithium alloy can be produced to high formability sheet products capable of being formed into wrought products with a thickness of 0.01" to 0.249". Aluminum-lithium alloys of the invention comprise from 3.2 to 4.1 wt. % Cu, 1.0 to 1.8 wt. % Li, 0.8 to 1.2 wt. % Mg, 0.10 to 0.50 wt. % Zn, 0.10 to 1.0 wt. % Mn, up to 0.12 wt. % Si, up to 0.15 wt. % Fe, up to 0.15 wt. % Ti, up to 0.15 wt. % incidental elements, with the total of these incidental elements not exceeding 0.35 wt. %, and the balance being aluminum. Ag should not be intentionally added and should not be more than 0.1 wt. % as a non-intentionally added element. Zr should not be intentionally added and should not be more than 0.05 wt. % as a non-intentionally added element. Mg is at least equal to or higher than 2 * Zn in weight percent in the invented alloy. Methods for manufacturing wrought products including aluminum-lithium alloys of the present invention are also provided.

IPC 8 full level

C22C 21/16 (2006.01); C22C 21/14 (2006.01); C22C 21/18 (2006.01); C22F 1/057 (2006.01)

CPC (source: EP US)

B21B 3/00 (2013.01 - US); B21D 25/00 (2013.01 - US); B22D 7/005 (2013.01 - EP US); C22C 21/14 (2013.01 - EP US); C22C 21/16 (2013.01 - EP US); C22C 21/18 (2013.01 - EP US); C22F 1/002 (2013.01 - EP US); C22F 1/057 (2013.01 - EP US); B21B 2003/001 (2013.01 - US)

Citation (opposition)

Opponent : C-TEC CONSTELLIUM TECHNOLOGY CENTER, CONSTELLIUM ISSOIRE

  • EP 3012338 A1 20160427 - KAISER ALUMINUM FABRICATED PRODUCTS LLC [US]
  • CN 102021457 A 20110420 - AVIC BEIJING INST OF AERONAUTICAL MATERIALS
  • WO 2007080267 A1 20070719 - ALCAN RHENALU [FR], et al
  • CN 101967588 A 20110209 - BEIJING INST AERONAUTICAL MATERIALS AVIAT INDUSTRY CORP CHINA
  • ZENG X H, AHMAD M; ENGLER O: "Texture gradient, average texture, and plastic anisotropy in various Al-Li sheet alloys", MATERIALS SCIENCE AND TECHNOLOGY, vol. 10, 1 July 1984 (1984-07-01), pages 581 - 591, XP093171192
  • "Standards and Data 2017 Metric SI", 1 December 2017, ALUMINUM ASSOCIATION TECHNICAL COMMITTEE ON PRODUCT STANDARDS, ISBN: 978-0-9863631-2-2, article ALUMINUM ASSOCIATION: "Aluminum and Aluminum Alloy Density Calculation Procedure", pages: 2 - 2-13, XP093171194
  • ASTM: "Standard Test Methods for Bend Testing of Material for Ductility", ASTM E 290-09, 1 January 2009 (2009-01-01), XP093171191, Retrieved from the Internet <URL:https://www.astm.org/e0290-09.html>

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)

EP 3495520 A1 20190612; EP 3495520 B1 20230607; EP 3495520 C0 20230607; CN 109868400 A 20190611; US 2019169727 A1 20190606

DOCDB simple family (application)

EP 18210045 A 20181204; CN 201811464125 A 20181203; US 201715830569 A 20171204