EP 0787217 A1 19970806 - METHOD FOR MAKING AlSiMgCu ALLOY PRODUCTS HAVING ENHANCED INTERCRYSTALLINE CORROSION RESISTANCE
Title (en)
METHOD FOR MAKING AlSiMgCu ALLOY PRODUCTS HAVING ENHANCED INTERCRYSTALLINE CORROSION RESISTANCE
Title (de)
VERFAHREN ZUR HERSTELLUNG VON GEGENSTÄDEN AUS AlSiMgCu-LEGIERUNG MIT VERBESSERTEN INTERKRISTALLINKORROSIONSWIEDERSTAND
Title (fr)
PROCEDE DE FABRICATION DE PRODUITS EN ALLIAGE ALSIMGCU A RESISTANCE AMELIOREE A LA CORROSION INTERCRISTALLINE
Publication
Application
Priority
- FR 9501412 W 19951024
- FR 9413047 A 19941025
Abstract (en)
[origin: WO9612829A1] A method for making high-strength rolled or extruded AlSiMgCu aluminium alloy products desensitised to intercrystalline corrosion, comprising a step of casting a plate or billet having the following composition: Si 0.7-1.3 %, Mg 0.6-1.1 %, Cu 0.5-1.1 %, Mn 0.3-0.8 %, Zr < 0.20 %, Fe < 0.30 %, Zn < 1 %, Ag < 1 %, Cr < 0.25 %, others < 0.05 % each and < 0.15 % in all, with the balance being aluminium and Mg/Si < 1; a homogenising step at 470-570 DEG C; a hot and optionally cold working step; solution treatment at 540-570 DEG C; a hardening step; and a tempering step including at least one temperature plateau at 120-250 DEG C, preferably 165-220 DEG C, the overall process length measured in equivalent time at 175 DEG C being 30-300 hours. A product having the composition given above and a conductivity, when desensitised to intercrystalline corrosion, at least 0.5 MS/m higher than in state T6, is also disclosed. Such products are particularly suitably for making structural members for aircraft fuselages or rail or road vehicles.
IPC 1-7
IPC 8 full level
C22F 1/00 (2006.01); C22C 21/02 (2006.01); C22C 21/08 (2006.01); C22F 1/05 (2006.01); C22F 1/057 (2006.01)
CPC (source: EP KR US)
C22C 21/08 (2013.01 - EP KR US); C22F 1/05 (2013.01 - EP KR US); C22F 1/057 (2013.01 - EP US)
Citation (search report)
See references of WO 9612829A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9612829 A1 19960502; CA 2202184 A1 19960502; DE 69502508 D1 19980618; DE 69502508 T2 19980910; EP 0787217 A1 19970806; EP 0787217 B1 19980513; FR 2726007 A1 19960426; FR 2726007 B1 19961213; JP H10512924 A 19981208; KR 970707314 A 19971201; US 5858134 A 19990112
DOCDB simple family (application)
FR 9501412 W 19951024; CA 2202184 A 19951024; DE 69502508 T 19951024; EP 95936606 A 19951024; FR 9413047 A 19941025; JP 51370096 A 19951024; KR 19970702642 A 19970422; US 80970497 A 19970404