| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a copper alloy cast billet with which the productivity is further improved by reducing a tool wearing in tube making while holding the processing facility in the production of a copper alloy tube and the productivity; and the copper alloy tube produced by processing the copper alloy cast billet. Ž<P>SOLUTION: In the cast billet for producing the copper alloy tube with a hot-extrusion; the cast billet has the composition composed by mass% of 0.004-0.05% P, 0.01-1.0% Zn and the balance Cu with inevitable impurities. To this copper alloy cast billet, hot-extrusion processing, rolling processing, extractive-drawing processing and annealing processing, are applied to produce the copper alloy tube. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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