Metal treatment – Stock – Aluminum base
Reexamination Certificate
2005-11-29
2005-11-29
Sheehan, John P. (Department: 1742)
Metal treatment
Stock
Aluminum base
C148S439000, C420S542000
Reexamination Certificate
active
06969432
ABSTRACT:
Rolled or extruded products for welded constructions made of AlMgMn type aluminum alloy. These products contain, in % by weight, 3.0<Mg<5.0, 0.75<Mn<1.0, Fe<0.25, Si<0.25, 0.02<Zn<0.40, optionally one or more of the elements Cr, Cu, Ti, Zr such that Cr<0.25, Cu<0.20, Ti<0.20, Zr<0.20, other elements <0.05 each and <0.15 in total, wherein Mn+2Zn>0.75. In the welded state, these products have improved mechanical strength and resistance to fatigue without unfavorable consequences with regard to toughness and corrosion resistance, and are particularly suitable for naval construction, for industrial vehicles and for bicycle frames made of welded tubes.
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Cottignies Laurent
Hoffmann Jean-Luc
Pillet Georges
Raynaud Guy-Michel
Dennison Schultz Dougherty & MacDonald
Pechiney Rhenalu
Sheehan John P.
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