Cu alloy excellent in machinability, extruded pipe member and Cu alloy synchronizer ring

摘要

PROBLEM TO BE SOLVED: To provide a Cu alloy with excellent machinability, a Cu alloy made extrusion pipe member made of the same, and a Cu alloy made synchronizer ring.SOLUTION: There are provided a Cu alloy excellent in machinability, containing, by mass%, Zn:25% or more and 43% or less, Al:2.0% or more and 8.0% or less, Ti:0.10% or more and 5.0% or less, Cr:0.010% or more and 0.040% or less, C:0.0005% or more and 0.010% or less and one or more kinds selected from Fe, Ni and Co of total 1.0% or more and 5.0% or less and the balance Cu with inevitable impurities and having a reduced production amount of an intermetallic compound and fine carbide dispersed in a base material, a Cu alloy made extrusion pipe member made of the same and a Cu alloy made synchronizer ring.SELECTED DRAWING: None