Appeal No. 2002-0183
Application No. 09/379,570
Appendix
Claim 1
1. An aluminum alloy forging comprising
Mg: 0.6 - 1.6% (mass% here and hereinafter),
Si: 0.6 - 1.8%,
Cu: 0.05 - 1.0%,
Fe: 0.30% or less,
one or more of Mn: 0.15 - 0.6% and Cr: 0.1 - 0.2%
Zr: 0.05 - 0.2%,
hydrogen: 0.25 cc/100 g A1 or less, and
a balance of A1 and inevitable impurities,
wherein the aluminum alloy forging is produced by
a process comprising
casting an aluminum alloy at a cooling rate
of 10ºC/sec or higher to form a cast aluminum alloy
ingot,
subjecting the cast aluminum alloy ingot to a
soaking heat treatment at a temperature of 530-600ºC,
and
then hot forging the cast aluminum alloy
ingot, and wherein a volume fraction of total
constituents phase particles(Mg2Si and Al-Fe-Si-Mn, Cr,
Zr) series intermetallic compounds) in the aluminum
alloy forging is 1.5% or less per unit area.
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