EP 1178125 A2 20020206 - AlMg alloy with improved mechanical properties for welded constructions
Title (en)
AlMg alloy with improved mechanical properties for welded constructions
Title (de)
AlMg-Legierung mit verbesserten mechanischen Eigenschaften für Schweisskonstruktionen
Title (fr)
Alliage AlMg pour constructions soudées à caractéristiques mécaniques améliorées
Publication
Application
Priority
- EP 96420311 A 19961015
- FR 9512466 A 19951018
Abstract (en)
An Al-Mg alloy sheet used for the production of welded structures of thickness above 2 mm and manufactured by semi-continuous casting has breaking strength Rm greater than 275 MPa, elongation A above 17.5, and product A x Rm above 6500. Preferred Features: The Al-Mg alloy comprises (in weight %): Mg 4.2-4.8; Mn less than 0.5; Zn less than 0.4, preferably 0.07-0.2; Fe 0.20-0.45; Si less than 0.3; optionally, Cr less than 0.15, Cu less than 0.25, Ti less than 0.2, and other elements less than 0.05 each and less than 0.15 in total; and Al the remainder. Mn+Zn is less than 0.7, preferably less than 0.2; and %Fe is greater than 0.5%Mn. The volumetric fractions of eutectic precipitates and dispersoids are above 0.7% and less than 1.5 times the fraction of eutectics, respectively. The sheet is fabricated without final annealing and the fabrication process includes hot rolling at a rolling exit temperature of 300-370 degrees C, preferably 320-360 degrees C. The width of the sheet is above 2200 mm. Independent claims are given for use of the Al-Mg alloy sheet for the fabrication of road and rail tanks, for road, rail and/or marine transport containers, for welded and/or forged car and lorry wheels, and for welded structures obtained by MIG or TIG welding with a bevel of around 45 degrees over about two-thirds of the thickness.
Abstract (fr)
L'invention concerne des tôles pour constructions soudées en alliage AlMg présentant une résistance à la rupture R m > 275 MPa, un allongement A > 17,5% et un produit A x R m > 6500 de composition (% en poids): Mg: 4,2 - 4,8€ƒ€ƒ€ƒMn: < 0,5€ƒ€ƒ€ƒZn < 0,4 Fe < 0,45€ƒ€ƒ€ƒSi < 0,30 et éventuellement: Cr < 0,15€ƒ€ƒ€ƒCu < 0,25€ƒ€ƒ€ƒTi < 0,20€ƒ€ƒ€ƒZr < 0,20 autres éléments < 0,05 chacun et < 0,15 au total, balance Al, avec la relation: Mn + Zn < 0,7. Les tôles selon l'invention sont destinées notamment à la fabrication de citernes ferroviaires ou routières, de conteneurs de transport et de roues de véhicules.
IPC 1-7
IPC 8 full level
C22C 21/06 (2006.01); C22F 1/00 (2006.01); C22F 1/047 (2006.01)
CPC (source: EP KR)
C22C 21/06 (2013.01 - EP KR); C22F 1/047 (2013.01 - EP)
Designated contracting state (EPC)
CH DE GB IT LI
DOCDB simple family (publication)
EP 0769564 A1 19970423; EP 0769564 B1 20011212; DE 1178125 T1 20020704; DE 69617872 D1 20020124; DE 69617872 T2 20020627; DE 769564 T1 19970911; EP 1178125 A2 20020206; EP 1178125 A3 20090401; FR 2740144 A1 19970425; FR 2740144 B1 19971121; JP H09111386 A 19970428; KR 100428237 B1 20040727; KR 970021346 A 19970528
DOCDB simple family (application)
EP 96420311 A 19961015; DE 01113630 T 19961015; DE 69617872 T 19961015; DE 96420311 T 19961015; EP 01113630 A 19961015; FR 9512466 A 19951018; JP 27642596 A 19961018; KR 19960046645 A 19961018