Copper alloy material

Abstract

A copper alloy material has a composition including: 0.3 mass % or more and less than 0.5 mass % of Cr; 0.01 mass % or more and 0.15 mass % or less of Zr; and a Cu balance including inevitable impurities, wherein an average of crystal grain sizes is in a range of 0.1 mm or more and 2.0 mm or less, and a standard deviation of the crystal grain sizes is 0.6 or less.

1 . A copper alloy material having a composition including:
 0.3 mass % or more and less than 0.5 mass % of Cr;   0.01 mass % or more and 0.15 mass % or less of Zr; and   a Cu balance including inevitable impurities,   wherein an average of crystal grain sizes is in a range of 0.1 mm or more and 2.0 mm or less, and   a standard deviation of the crystal grain sizes is 0.6 or less.   
     
     
         2 . The copper alloy material according to  claim 1 ,
 wherein an area ratio of crystallized Cr in cross section observation is 0.5% or less.   
     
     
         3 . The copper alloy material according to  claim 1 ,
 wherein, after performing a heat treatment at 1000° C. for 1 hour retention, an average of crystal grain sizes is in a range of 0.1 mm or more and 3.0 mm or less, and a standard deviation of the crystal grain sizes is 1.5 or less.   
     
     
         4 . The copper alloy material according to  claim 1 , wherein the composition of the copper alloy material further includes Al in a range of 0.1 mass % or more and 2.0 mass % or less. 
     
     
         5 . The copper alloy material according to  claim 1 , wherein the composition of the copper alloy material further includes one or more elements selected from Fe, Co, Sn, Zn, P, Si and Mg in a range of 0.005 mass % or more and 0.1 mass % or less as a total.