Patent ID: 8641837
Filing Date: 2014-02-04
Classification: C22C,C22F

Abstract:
1. A copper alloy having excellent stress relaxation properties comprising: 0.1 to 3.0% of Ni, 0.1 to 3.0% of Sn, and 0.01 to 0.3% of P, in mass percent respectively, and the remainder being copper and inevitable impurities, wherein the Ni/P ratio in the copper alloy is from 10.2 to 17.5; wherein in a radial distribution function around a Ni atom according to a XAFS analysis method, a first peak position is within a range of 2.16 to 2.35 Å, the position indicating a distance between a Ni atom in Cu and an atom nearest to the Ni atom; wherein said copper alloy has a conductivity of 24 to 41% IACS; wherein said excellent stress relaxation properties are defined as having a stress relaxation ratio of 10 to 15% in the direction perpendicular to the direction the copper alloy is rolled; and wherein said copper alloy is made by a method which comprises: