| abstract |
The free-cutting copper alloy according to the present invention has a significantly reduced lead content compared to conventional free-cutting copper alloys, but has machinability that can be industrially satisfied. . The free-cutting copper alloy of the present invention comprises 71.5-78.5 wt% copper, 2.0-4.5 wt% silicon, and 0.005 wt% or more and less than 0.02 wt% lead. And the remaining zinc. |