| (19) |
 |
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(11) |
EP 1 096 028 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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06.02.2002 Bulletin 2002/06 |
| (43) |
Date of publication A2: |
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02.05.2001 Bulletin 2001/18 |
| (22) |
Date of filing: 16.10.2000 |
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| (51) |
International Patent Classification (IPC)7: C22C 21/04 |
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| (84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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Designated Extension States: |
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AL LT LV MK RO SI |
| (30) |
Priority: |
21.10.1999 JP 29957899
|
| (71) |
Applicant: KABUSHIKI KAISHA DAIKI ALUMINIUM KOGYOSHO |
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Yao-shi Osaka (JP) |
|
| (72) |
Inventors: |
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- Takao, Suzuki, c/o K. K. Daiki Aluminium Kogyosho
Yao-shi, Osaka (JP)
- Oshiro, Naoto, c/o K. K. Daiki Aluminium Kogyosho
Yao-shi, Osaka (JP)
|
| (74) |
Representative: Freed, Arthur Woolf et al |
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Edward Evans Barker Clifford's Inn Fetter Lane
London EC4A 1BZ
London EC4A 1BZ (GB) |
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| |
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| (54) |
High-strength aluminum alloy for pressure casting and cast aluminum alloy comprising
the same |
(57) Disclosed is a high-strength cast aluminum alloy obtained by: casting a high-strength
aluminum alloy containing 3.5-4.3 % of Cu, 5.0-7.5 % of Si, 0.10-0.25 % of Mg, not
more than 0.2 % of Fe, not more than 0.0003 % of P, and the balance comprising Al
and unavoidable impurities; and subjecting the alloy thus cast to a T6 treatment.
This cast alloy has finer eutectic Si grains by virtue of such a very low P content,
enjoys casting and economic merits that are competitive with existing alloys, and
satisfies higher mechanical requirements as to tensile strength, elongation, 0.2%
proof strength and impact value.