Alloys or metallic compositions – Aluminum base – Copper containing
Patent
1994-08-09
2000-09-05
Jones, Deborah
Alloys or metallic compositions
Aluminum base
Copper containing
148416, 148438, 148550, 148552, 148690, 148695, 148699, 420531, 420537, 420538, 420554, C22C 2112
Patent
active
061138509
ABSTRACT:
An A-rated, aluminum alloy suitable for machining, said alloy consisting essentially of: about 4-5.75 wt. % copper, about 0.2-0.9 wt. % bismuth, about 0.12-1.0 wt. % tin, the ratio of bismuth to tin ranging from about 0.8:1 to 5:1, up to about 0.7 wt. % iron, up to about 0.4 wt. % silicon, up to about 0.3 wt. % zinc, the balance aluminum, incidental elements and impurities. On a preferred basis, this alloy contains about 4.4-5.0 wt. % copper, about 0.4-0.75 wt. % bismuth, about 0.2-0.5 wt. % tin, the ratio of bismuth to tin ranging from about 1:1 to 3:1, about 0.2 wt. % or less iron and about 0.2 wt. % or less silicon. The alloy is substantially lead-free, cadmium-free and thallium-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 aging the same.
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Bartges Charles W.
Brock James A.
Hyland M. Elise
Klemp Thomas J.
Scott Gerald D.
Aluminum Company of America
Jones Deborah
Koehler Robert R.
Topolosky Gary P.
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