| 摘要 |
<p>A metal material comprising a Cu-Zn alloy in which a low melting point metal phase formed from Sn and Bi is dispersed in the form of particles and in a particle number concentration of 10 4 /mm 3 or more, the metal material comprising 58 to 62% Cu and optionally up to 0,5% Fe, 1,0 to 4,5% Sn, 0,3 to 0,6% Bi, 0,02 to 0,04% P and Zn as remainder.</p> |
