Copper alloy wrought material, copper alloy part, and method of producing a copper alloy wrought material

Abstract

A copper alloy wrought material, containing 1.5 to 7.0 mass % of Ni, 0.3 to 2.3 mass % of Si, 0.02 to 1.0 mass % of S, and optionally at least one selected from the group consisting of Sn, Mn, Co, Zr, Ti, Fe, Cr, Al, P, and Zn in a total amount of 0.05 to 2.0 mass %, with the balance being Cu and unavoidable impurities, wherein sulfide particles, which contribute to machinability, are dispersed therein, in which an average diameter of the sulfide particles is 0.1 to 10 μm, and in which an area ratio of the sulfide particles is 0.1 to 10%, and wherein the copper alloy wrought material has a tensile strength of 500 MPa or greater and an electrical conductivity of 25% IACS or higher.

1 . A copper alloy wrought material, containing 1.5 to 7.0 mass % of Ni, 0.3 to 2.3 mass % of Si, 0.02 to 1.0 mass % of S, and optionally at least one selected from the group consisting of Sn, Mn, Co, Zr, Ti, Fe, Cr, Al, P, and Zn in a total amount of 0.05 to 2.0 mass %, with the balance being Cu and unavoidable impurities, wherein sulfide particles are dispersed therein, in which an average diameter of the sulfide particles is 0.1 to 10 μm, and in which an area ratio of the sulfide particles is 0.1 to 10%, and wherein the copper alloy wrought material has a tensile strength of 500 MPa or greater and an electrical conductivity of 25% IACS or higher. 
     
     
         2 . The copper alloy wrought material according to  claim 1 , wherein the sulfide particles are composed of at least one selected from the group consisting of Cu—S, Mn—S, Zr—S, Ti—S, Fe—S, Al—S, Cr—S, and Zn—S. 
     
     
         3 . A copper alloy part, formed by subjecting the copper alloy wrought material according to  claim 1  to cutting. 
     
     
         4 . A method of producing the copper alloy wrought material according to  claim 1 , wherein a cooling speed at the time of casting is set to 0.1 to 50° C./second. 
     
     
         5 . A copper alloy wrought material, containing 1.5 to 7.0 mass % of Ni, 0.3 to 2.3 mass % of Si, 0.02 to 1.0 mass % of S, and optionally at least one selected from the group consisting of Sn, Mn, Co, Zr, Ti, Fe, Cr, Al, P, and Zn in a total amount of 0.05 to 2.0 mass %, with the balance being Cu and unavoidable impurities, wherein sulfide particles are present in crystals of the matrix at 40% or larger in an area ratio of the sulfide particles in a cross-section parallel to the wrought direction, wherein the sulfide particles having an aspect ratio in the cross-section parallel to the wrought direction of 1:1 to 1:100 are dispersed in the matrix, and wherein the copper alloy wrought material has a tensile strength of 500 MPa or greater and an electrical conductivity of 25% IACS or higher. 
     
     
         6 . The copper alloy wrought material according to  claim 5 , wherein the sulfide particles are composed of at least one selected from sulfides of Cu—S, Mn—S, Zr—S, Ti—S, Fe—S, Al—S, Cr—S, and Zn—S. 
     
     
         7 . A copper alloy part, formed by subjecting the copper alloy wrought material according to  claim 5  to cutting. 
     
     
         8 . A method of producing the copper alloy wrought material according to  claim 5 , containing the steps of:
 conducting any one of steps (a) and (b), at the time of working a copper alloy composition containing 1.5 to 7.0 mass % of Ni, 0.3 to 2.3 mass % of Si, 0.02 to 1.0 mass % of S, and optionally at least one selected from the group consisting of Sn, Mn, Co, Zr, Ti, Fe, Cr, Al, P, and Zn in a total amount of 0.05 to 2.0 mass %, with the balance being Cu and unavoidable impurities;   area-reduction working at 0% to 95%; and   subjecting the resultant worked-product to aging at 350 to 600° C.:   (a) subjecting the copper alloy composition to hot working, and then to quenching;   (b) subjecting the copper alloy composition to hot working, then to cold working and a heat treatment at a temperature of 600° C. to 1,000° C. repeatedly for one or more times, and to a solution treatment before final cold-working.