Free-cutting copper alloy containing very low lead
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United States of America Patent
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Feb 8, 2011
Grant Date -
Mar 22, 2007
app pub date -
May 26, 2006
filing date -
Sep 22, 2005
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Abstract
The free-cutting copper alloy according to the present invention contains a greatly reduced amount of lead in comparison with conventional free-cutting copper alloys, but provides industrially satisfactory machinability. The free-cutting alloys comprise 71.5 to 78.5 percent, by weight, of copper, 2.0 to 4.5 percent, by weight, of silicon, 0.005 percent up to but less than 0.02, by weight, of lead, and the remaining percent, by weight, of zinc.
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