Lead-free free-machining brass having improved castability
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United States of America Patent
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May 8, 2018
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app pub date -
Jan 23, 2015
filing date -
Oct 10, 2007
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Abstract
A brass free from lead and possessing excellent machinability, castability, mechanical properties, etc. consists of not less than 55% by weight and not more than 75% by weight of Cu, not less than 0.3% by weight and not more than 4.0% by weight of Bi, and y % by weight of B and x % by weight of Si, y and x satisfying the following requirements: 0≤x≤2.0, 0≤y≤0.3, and y>−0.15x+0.015ab, wherein a is 0.2 when Bi is 0.3% by weight≤Bi<0.75% by weight; 0.85 when Bi is 0.75% by weight≤Bi<1.5% by weight; and 1 when Bi is 1.5% by weight≤Bi≤4.0% by weight, b is 1 when the apparent content of zinc (Zn) is not less than 37% and less than 41%; and 0.75 when the apparent content of Zn is not less than 41% and not more than 45%, the balance consisting of Zn and unavoidable impurities.
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