Global patent index - EP 0990058 A1

EP 0990058 A1 2000-04-05 - PROCESS OF PRODUCING HEAT-TREATABLE ALUMINUM ALLOY SHEET

Title (en)

PROCESS OF PRODUCING HEAT-TREATABLE ALUMINUM ALLOY SHEET

Title (de)

VERFAHREN ZUR HERSTELLUNG EINES BLECHES AUS WÄRMEBEHANDLUNGSFÄHIGER ALUMINIUM-LEGIERUNG

Title (fr)

PROCEDE DE PRODUCTION D'UNE FEUILLE EN ALLIAGE D'ALUMINIUM APTE AU TRAITEMENT THERMIQUE

Publication

EP 0990058 A1 (EN)

Application

EP 98930576 A

Priority

  • CA 9800596 W
  • US 5034197 P

Abstract (en)

[origin: WO9859086A1] A process of producing aluminum sheet articles made of 6000 or 2000 series aluminum alloy suitable for manufacture into automotive parts. The process comprises direct chill casting the alloy to produce a cast ingot, scalping the cast ingot to form a scalped ingot, homogenizing the scalped ingot at a temperature between 480 and 580 DEG C for less than 48 hours to form an homogenized ingot, hot rolling the homogenized ingot to an intermediate gauge to form an article of intermediate thickness, and cold rolling the article of intermediate thickness to final gauge, wherein the cold rolling reduces the thickness of the intermediate sheet article by an amount in the range of 15 to 40 % to the final gauge. By limiting the amount of reduction brought about by cold rolling, roping effects exhibited in the fimal product in T4 temper (normally following solutionizing and pre-aging) can be reduced or eliminated. In fact, the cold rolling step can be eliminated entirely, if a suitable reduction of sheet thickness can be achieved by hot rolling alone.

IPC 1-7 (main, further and additional classification)

C22F 1/05; C22F 1/057

IPC 8 full level (invention and additional information)

C22F 1/00 (2006.01); C22F 1/05 (2006.01); C22F 1/057 (2006.01)

CPC (invention and additional information)

C22F 1/05 (2013.01); C22F 1/057 (2013.01)

Citation (search report)

See references of WO 9859086A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

WO 9859086 A1 19981230; BR 9810204 A 20001017; CA 2294122 A1 19981230; DE 69820058 D1 20040108; DE 69820058 T2 20040603; EP 0990058 A1 20000405; EP 0990058 B1 20031126; JP 2002508030 A 20020312; NO 996280 A 20000221; NO 996280 D0 19991217

INPADOC legal status

2008-04-30 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2007-04-27 [REG FR ST] NOTIFICATION OF LAPSE

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2007-02-28 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

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2006-06-18 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2004-01-08 [REF] CORRESPONDS TO:

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