| 摘要 |
PROBLEM TO BE SOLVED: To provide a raw material brass alloy for producing a brass alloy casting composed of fine crystal grains by a half-melted alloy casting process without stirring molten metal. SOLUTION: The raw material brass alloy has a componential composition comprising, by mass, 8 to 40% Zn, 0.0005 to 0.04% Zr and 0.01 to 0.25% P, if required, further comprising one or more selected from, by mass 2 to 5% Si, 0.05 to 6% Sn and 0.05 to 3.5% Al, and, if required, further comprising one or more selected from, by mass, 0.005 to 0.45% Pb, 0.005 to 0.45% Bi, 0.03 to 0.45% Se and 0.01 to 0.45% Te, and the balance Cu with inevitable impurities. COPYRIGHT: (C)2007,JPO&INPIT
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