	US 12,252,771 B2
	Thick products made of 7XXX alloy and manufacturing process
Cedric Gasqueres, Aix en Provence (FR); and Jean-Etienne Fournier, Basse-Nendaz (CH)
Assigned to CONSTELLIUM ISSOIRE, Issoire (FR); and CONSTELLIUM VALAIS SA (AG-LTD), Sierre (CH)
Filed by CONSTELLIUM ISSOIRE, Issoire (FR); and CONSTELLIUM VALAIS SA (AG-LTD), Sierre (CH)
Filed on Feb. 23, 2022, as Appl. No. 17/678,591.
Application 17/678,591 is a division of application No. 13/994,097, granted, now 11,306,379, previously published as PCT/FR2011/000637, filed on Dec. 6, 2011.
Claims priority of application No. 1004865 (FR), filed on Dec. 14, 2010.
Prior Publication US 2022/0389558 A1, Dec. 8, 2022
Int. Cl. C22C 21/10 (2006.01); C22C 21/00 (2006.01); C22F 1/053 (2006.01)

CPC C22F 1/053 (2013.01) [C22C 21/00 (2013.01); C22C 21/10 (2013.01)]

18 Claims

1. A cast aluminum alloy thick block with a thickness greater than 450 mm comprising (as a percentage by weight):

Zn: 5.3-5.7%,

Mg: 0.8-1.8%,

Cu: <0.2%,

Zr: 0.05-0.12%,

Ti: <0.15%,

Mn: <0.1%,

Cr: <0.1%,

Si: <0.15%,

Fe: <0.20%,

impurities with individual content <0.05% each and <0.15% of the total, rest aluminum,

wherein at ¼ thickness in direction TL, yield strength Rp0.2 and a ratio called NSR between the mechanical strength on a notched bar and the yield strength Rp0.2 measured according to ASTM E602-03, section 9.2 are such that:

NSR>−0.017*Rp0.2+6.4 and

Rp0.2>320 MPa.