Copper alloy material and method of making same

Abstract

A copper alloy material for electric parts having: 1.0 to 5.0 mass % of Ni; 0.2 to 1.0 mass % of Si; 0.05 to 2.0 mass % of Sn; 0.1 to 5.0 mass % of Zn; 0.01 to 0.3 mass % of P; 0.05 to 1.0 mass % of at least one of Fe and Co; and the balance consisting of Cu and an unavoidable impurity. The ratio, (Ni+Fe+Co)/(Si+P), between the total mass of Ni, Fe and Co and the total mass of Si and P is 4 or more and 10 or less.

1 . A copper alloy material for electric parts, comprising: 
 1.0 to 5.0 mass % of Ni;    0.2 to 1.0 mass % of Si;    0.05 to 2.0 mass % of Sn;    0.1 to 5.0 mass % of Zn;    0.01 to 0.3 mass % of P;    0.05 to 1.0 mass % of at least one of Fe and Co; and    the balance consisting of Cu and an unavoidable impurity,    wherein a ratio, (Ni+Fe+Co)/(Si+P), between a total mass of Ni, Fe and Co and a total mass of Si and P is 4 or more and 10 or less.    
   
   
       2 . The copper alloy material according to  claim 1 , wherein: 
 the copper alloy material comprises a tensile strength of 700 N/mm 2  or more.    
   
   
       3 . The copper alloy material according to  claim 1 , wherein: 
 the copper alloy material comprises an elongation of 10% or more.    
   
   
       4 . The copper alloy material according to  claim 1 , wherein: 
 the copper alloy material comprises an electric conductivity of 40% IACS or more.    
   
   
       5 . A copper alloy material for electric parts, comprising: 
 1.0 to 5.0 mass % of Ni;    0.2 to 1.0 mass % of Si;    0.05 to 2.0 mass % of Sn;    0.1 to 5.0 mass % of Zn;    0.01 to 0.3 mass % of P;    0.05 to 1.0 mass % of at least one of Fe and Co;    0.01 to 1.0 mass % of at least one of Mg, Ti, Cr and Zr and    the balance consisting of Cu and an unavoidable impurity,    wherein a ratio, (Ni+Fe+Co)/(Si+P), between a total mass of Ni, Fe and Co and a total mass of Si and P is 4 or more and 10 or less.    
   
   
       6 . The copper alloy material according to  claim 5 , wherein: 
 the copper alloy material comprises a tensile strength of 700 N/mm 2  or more.    
   
   
       7 . The copper alloy material according to  claim 5 , wherein: 
 the copper alloy material comprises an elongation of 10% or more.    
   
   
       8 . The copper alloy material according to  claim 5 , wherein: 
 the copper alloy material comprises an electric conductivity of 40% IACS or more.    
   
   
       9 . A method of making the copper alloy material for electric parts as defined in  claim 1 , comprising: 
 preparing a copper alloy raw material with the same composition and the same mass ratio as defined in  claim 1;     a first cold rolling step that the copper alloy raw material is cold-rolled down to a thickness of 1.1 to 1.3 times a target thickness of a final product;    a first heat treatment step that the cold-rolled material in the first cold rolling step is heated up to 700 to 850° C. and then cooled to 300° C. or less at a cooling rate of 25° C./min or more;    a second cold rolling step that the treated material in the first heat treatment step is cold-rolled down to the target thickness; and    a second heat treatment step that the cold-rolled material in the second cold rolling step is heated up to 400 to 500° C. and held for 30 min. to 3 hrs.    
   
   
       10 . A method of making the copper alloy material for electric parts as defined in  claim 5 , comprising: 
 preparing a copper alloy raw material with the same composition and the same mass ratio as defined in  claim 5;     a first cold rolling step that the copper alloy raw material is cold-rolled down to a thickness of 1.1 to 1.3 times a target thickness of a final product;    a first heat treatment step that the cold-rolled material in the first cold rolling step is heated up to 700 to 850° C. and then cooled to 300° C. or less at a cooling rate of 25° C./min or more;    a second cold rolling step that the treated material in the first heat treatment step is cold-rolled down to the target thickness; and    a second heat treatment step that the cold-rolled material in the second cold rolling step is heated up to 400 to 500° C. and held for 30 min. to 3 hrs.