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US 5,137,685 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
Estimating the term…
Abstract
Machinable copper alloys having a reduced lead concentration are disclosed. An additive to the alloy accumulates both at the grain boundaries and intragranularly. The additive facilitates chip fracture or lubricates the tool. One additive is a mixture of bismuth and lead with the lead concentration below about 2% by weight.
Claims30
A reduced lead alloy, consisting essentially of:
- from about 30 percent to about 58 percent by weight zinc;
- from that amount effective to improve machinability up to about 5% by weight of an addition which includes bismuth and at least one element selected from the group consisting lead, cadmium, tin, indium, magnesium and tellurium;
- and
- the balance copper.
1 more element
A reduced lead copper alloy consisting essentially of:
- from about 30% to about 58% by weight zinc;
- from about 1.8% to about 5.0% by weight bismuth;
- and
- the balance copper.
1 more element
An essentially lead-free copper alloy consisting essentially of:
- from about 30% to about 58% by weight zinc;
- from about 1.8% to about 5.0% by weight bismuth;
- and
- the balance copper.
1 more element
A reduced lead copper alloy consisting essentially of:
- from about 30% to about 58% by weight zinc;
- from that amount effective to improve machinability up to about 5% by weight of an addition which includes bismuth and at least one element selected from the group consisting of cadmium, tin, indium, magnesium and tellurium;
- up to about 2% by weight of a spheroidizing agent selected from the group consisting of phosphorous, antimony and tin.
Dependencies are inferred from the claim text.