C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 21/06 (2006.01) C22F 1/047 (2006.01)
Patent
CA 2103182
- 31 - ABSTRACT OF THE DISCLOSURE An aluminum alloy sheet excellent in strength and deep drawing formability of the invention comprises an aluminum alloy containing 5 to 10 wt.% of Mg, 0.0001 to 0.01wt.% of Be, 0.01 to 0.05 wt.% of Cr, 0.005 to 0.1 Wt.% of Ti or both 0.005 to 0.1 wt.% of Ti and 0.00001 to 0.005 wt.% of B, or 0.05 to 1.0 wt.% of Cu in addition to the above compositions, Fe and Si as impurities respectively regulated to be less than 0.2 wt.% and the remainders consisting of other inevitable impurities and Al, wherein 0.1 to 0.5 vol.% of intermetallic compounds containing Cr with the mean diameter of not more than 0.2 µm are dispersed into the metal structure of the Al alloy sheet, and the mean grain diameter of the metal structure is in the range of 5 to 30 µm. A process of manufacturing the aluminum alloy sheet comprises the steps of homogenizing the aluminum alloy slab with the above compositions at 450 to 540°C for not more than 24 hours., then subjecting the homogenized alloy slab to hot rolling, carrying out a precipitation treatment of intermetallic compounds containing Cr at least once at 230 to 360°C for 1 to 100 hours immediately after the hot rolling or on the way of cold rolling followed by the hot rolling, then subjecting the resultant alloy sheet to final cold rolling up to a predetermined thickness and then heating the finally cold rolled alloy sheet at 400 to 500°C for not more than 120 seconds.
Bekki Yoichiro
Shoji Ryo
Gowling Lafleur Henderson Llp
Kawasaki Steel Corporation
The Furukawa Electric Co. Ltd.
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