High-strength aluminum alloy extruded product exhibiting...

Details High-strength aluminum alloy extruded product exhibiting... High-strength aluminum alloy extruded product exhibiting...

2011-04-19

2011-04-19

King, Roy (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S690000

Reexamination Certificate

active

07927436

ABSTRACT:
The present invention provides a high-strength aluminum alloy extruded product exhibiting excellent corrosion resistance and secondary workability and suitably used as a structural material for transportation equipment such as automobiles, railroad vehicles, and aircrafts, and a method of manufacturing the same. The aluminum alloy extruded product has a composition containing 0.6 to 1.2% of Si, 0.8 to 1.3% of Mg, and 1.3 to 2.1% of Cu while satisfying the following conditional expressions (1), (2), (3) and (4),in-line-formulae description="In-line Formulae" end="lead"?3%≦Si %+Mg %+Cu %≦4%  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Mg %≦1.7×Si %  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Mg %+Si %≦2.7%  (3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Cu %/2≦Mg %≦(Cu %/2)+0.6%  (4)in-line-formulae description="In-line Formulae" end="tail"?and further containing 0.04 to 0.35% of Cr, and 0.05% or less of Mn as an impurity, with the balance being aluminum and unavoidable impurities. The cross section of the extruded product has a recrystallized structure with an average grain size of 500 μm or less.

REFERENCES:
patent: 10306338 (1998-11-01), None
patent: 2001205329 (2001-07-01), None
patent: 2002317255 (2002-10-01), None

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