Kitz Corporation

Kozo Ito

Masaru Yamazaki

Koichi Hagiwara

Mitsuhide Hirabayashi

Yukihiro Hirata

Yoshihiro Hirata

Brass consists essentially of Cu, Sn, Bi, Fe, Ni and P in weight ratios respectively of 58.0-63.2%, 0.3-2.0%, 0.7-2.5%, 0.05-0.3%, 0.10-0.50% and 0.05-0.15% plus the balance of Zn and unavoidable impurities to exhibit excellent tolerance for dezincification, hot forgeability and machinability.

Brass

A copper-based alloy includes one base phase selected from the group consisting of &agr; phase, &agr;&plus;&bgr; phase, and &agr;&plus;&bgr;&plus;&ggr; phase, a component having a lower melting point than the base phase, and a component for dispersing the base phase and the low melting component to uniformly disperse the low melting component and improve the copper-based alloy in machinability. A method for producing the copper alloy in the form of a bar or plate includes the steps of compounding raw materials in predetermined ratios thereby obtaining a mixture, fusing the mixture thereby obtaining a melt, continuously casting the melt into a cast billet, or rolling the cast billet thereby obtaining a shaped mass, heat-treating the shaped mass, drawing or rolling the heat-treated shaped mass thereby obtaining a plastic mass, and subjecting the plastic mass to a heat-treatment of air cooling or furnace cooling.

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Nagano, Japan

Kozo Ito