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US 5,288,458 AGranted
Machinable copper alloys having reduced lead content
AssigneeOlin Corporation
InventorsDavid D. McDevitt, Jacob Crane, John F. Breedis, Ronald N. Caron, Frank N. Mandigo, Joseph Saleh
Life of this patent
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Abstract
Machinable alpha beta brass having a reduced lead concentration is claimed. The alloy contains bismuth to improve machinability. Either a portion of the zinc is replaced with aluminum, silicon or tin, or a portion of the copper is replaced with iron, nickel or manganese.
Claims18
An alpha/beta brass comprising:
- copper, zinc, a partial zinc substitute and from about 1.8% to about 5.0% by weight bismuth, said zinc and zinc substitute present in an amount sufficient to form an amount of beta phase effective to minimize hot shorting said alpha/beta brass having been hot worked at temperatures above about 600.degree. C. and an amount of alpha phase present at room temperature effective to provide cold workability.
An alpha/beta brass consisting essentially of:
- copper;
- zinc;
- a partial zinc substitute selected from the group consisting of aluminum, silicon, tin and mixtures thereof, said zinc and zinc substitute being present in an amount sufficient to form an amount of beta phase effective to minimize hot shorting said alpha/beta brass having been hot worked at temperatures above about 600.degree. C. and an amount of alpha phase present at room temperature effective to provide cold workability;
- and
- from about 1.8% to about 5.0% by weight bismuth.
2 more elements
Dependencies are inferred from the claim text.