Global Patent Index - EP 2553131 B1

EP 2553131 B1 20190508 - HIGH TEMPERATURE STABLE ALUMINIUM ALLOY

Title (en)

HIGH TEMPERATURE STABLE ALUMINIUM ALLOY

Title (de)

HOCHTEMPERATURSTABILE ALUMINIUMLEGIERUNG

Title (fr)

ALLIAGE D'ALUMINIUM STABLE À HAUTE TEMPÉRATURE

Publication

EP 2553131 B1 20190508 (EN)

Application

EP 11763104 A 20110330

Priority

  • NO 20100474 A 20100330
  • NO 2011000111 W 20110330

Abstract (en)

[origin: WO2011122958A1] The present invention relates to Al-Mg-Si-Cu alloy optimised for high temperature stability The alloy is characterized in that its content of Mg and Si lies within a polygon defined by the following coordinates of an Mg-Si diagram: a1 - a2 - a3 - a4 -a1 where in wt.% a1 = 0.60Mg,0.60Si, a2 = 0.90Mg, 0.90Si, a3 = 1.30 Mg, 0.60 Si and a4 = LOOMg, 0.30Si, and with the additional alloying elements: - Cu between 0.20 and 0.50 wt.% - Fe between 0.08 and 0.40 wt.%, and where at least one of the following elements are added for the purpose of grain structure control during processing of the alloy - Mn between 0 and 0.80 wt.% - Cr between 0 and 0.30 wt.% - Zr between 0 and 0.30 wt.%, and optionally Ti up to 0, 1 wt% and B up to 0,1 wt% as grain refining elements, and further optionally Ge between 0 and 0.20 wt.% and Ag between 0 and 0.20 wt.%, rest Al, including incidental impurities. In the alloy as defined above the L-phase is the dominant precipitate type as regards number density upon over-ageing.

IPC 8 full level

C22C 21/08 (2006.01)

CPC (source: EP)

C22C 21/08 (2013.01)

Citation (opposition)

Opponent : Constellium Valais S.A.

  • EP 2003219 A2 20081217 - KOBE STEEL LTD [JP]
  • US 5888320 A 19990330 - DORWARD RALPH C [US]
  • JP H086161 B2 19960124
  • JP 2003181530 A 20030702 - MITSUBISHI ALUMINIUM
  • FR 1602294 A 19701102
  • HOLMESTAD, JON: "High temperature stability of Al-Mg-Si alloys (Master's Thesis)", 15 June 2009 (2009-06-15), XP055682281, Retrieved from the Internet <URL:High-temperature stability of Al-Mg-Si alloys (master's thesis)>
  • L. SAGALOWICZ ET AL.: "A study of the structural precipitation in the Al-Mg-Si-Cu system", 4TH INTERNATIONAL CONFERENCE ON ALUMINUM ALLOYS, 1994, pages 636 - 643, XP055682287
  • D.J. CHAKRABARTI ET AL.: "Precipitation In Al-Mg-Si Alloys with Cu Additions and the Role of the Q'and Related Phases", MATERIALS SCIENCE FORUM, 1999, XP055682292

Opponent : TRIMET Aluminium SE,

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 2011122958 A1 20111006; EP 2553131 A1 20130206; EP 2553131 A4 20170405; EP 2553131 B1 20190508

DOCDB simple family (application)

NO 2011000111 W 20110330; EP 11763104 A 20110330