| 摘要 |
Reduced-lead yellow brass alloys are disclosed. The alloys comprise copper; zinc; an amount of bismuth effective to enhance castability of the alloys; and an amount of selenium effective to increase machinability of the alloy. Preferably, the alloys further include an amount of antimony effective to inhibit dezincification of the alloys. In a particularly preferred embodiment, an alloy according to the present invention comprises zinc; copper in an amount ranging from about 62.5 percent to about 64.0 percent by weight; tin in an amount ranging from about 0.2 percent to about 0.4 percent by weight; iron in an amount ranging from about 0.1 percent to about 0.3 percent by weight; nickel in an amount ranging from about 0.15 percent to about 0.25 percent by weight; aluminum in an amount ranging from about 0.3 percent to about 0.6 percent by weight; bismuth in an amount ranging from about 0.8 percent to about 1.0 percent by weight; antimony in an amount ranging from about 0.02 percent to about 0.04 percent by weight; and selenium in an amount ranging from about 0.05 percent to about 0.25 percent by weight. The disclosed alloys exhibit excellent castability, machinability, and polishability, and, when used in decorative plumbing fixtures, will not dezincify nor leach lead into potable water.
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