Title: Lead-free 6XXX aluminium alloy
Application Number: 95191055 Application Date: 1995.09.15
Publication Number: 1137807 Publication Date: 1996.12.10
Approval Pub. Date: 2000.11.22 Granted Pub. Date: 2000.11.22
International Classifi-cation: C22C21/02;C22C21/08;C22C21/12;C22C21/14;C22C21/16;C22F1/04
Applicant(s) Name: Aluminum Company of America Address:
Inventor(s) Name: C. W. Bartges;T. J. Klemp;G. D. Scott
Attorney & Agent: XU RUXUN
Abstract:
    An aluminum alloy suitable for machining, said alloy consisting essentially of: about 0.15-1.0 wt.% copper, about 0.4-1.5 wt.% tin, about 0.65-1.35 wt.% magnesium, about 0.4-1.1 wt.% silicon, about 0.002-0.35 wt.% manganese, up to about 0.5 wt.% iron, up to about 0.15 wt.% chromium and up to about 0.15 wt.% titanium, the remainder substantially aluminum. On a preferred basis, this alloy contains about 0.45-0.7 wt.% copper, about 0.9-1.3 wt.% tin, about 0.7-0.9 wt.% magnesium and about 0.45-0.75 wt.% silicon. The alloy is lead-free, bismuth-free, nickel-free, zirconium-free and cadmium-free. There is further disclosed an improved method for making screw machine stock or wire, rod and bar product from this alloy by casting, preheating, extruding, solution heat treating, cold finishing and thermally processing the aforementioned alloy composition.
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