Copper alloy material for electric/electronic parts

Abstract

A copper alloy material for electric/electronic parts, containing Co in an amount of 0.7 to 2.5 mass % and Si in an amount that gives a mass ratio of Co and Si (Co/Si ratio) within the range from 3.5 to 4.0, with the balance being Cu and unavoidable impurities, wherein the grain size is 3 to 15 μm.

1 . A copper alloy material for electric/electronic parts, comprising Co in an amount of 0.7 to 2.5 mass % and Si in an amount that gives a mass ratio of Co and Si (Co/Si ratio) within the range from 3.5 to 4.0, with the balance being Cu and unavoidable impurities, wherein the grain size is 3 to 15 μm. 
     
     
         2 . A copper alloy material for electric/electronic parts, comprising Co in an amount of 0.7 to 2.5 mass %, at least one selected from the group consisting of Cr, Ni, Fe, Zr, Ti, Al, Sn, Mg, and Zn in an amount of 0.01 to 0.15 mass %, and Si in an amount that gives a mass ratio of the total mass of Co and at least one (X) selected from the group consisting of Cr, Ni, Fe, Zr, and Ti to Si ((Co+X)/Si ratio) within the range from 3.5 to 4.0, wherein the grain size is 3 to 15 μm.