Patent ID: 8992702
Filing Date: 2015-03-31
Classification: C22C,C22F,H01B

Abstract:
1. A copper alloy sheet consisting of: 1.0 mass % to 3.5 mass % Ni, 0.5 mass % to 2.0 mass % Co, and 0.3 mass % to 1.5 mass % Si, a Co/Ni mass ratio being 0.15 to 1.5, an (Ni+Co)/Si mass ratio being 4 to 7, and a balance being composed of Cu and an unavoidable impurity, wherein in observation results of a crystal grain boundary property and crystal orientation by EBSP measurement, a density of twin boundaries among all crystal grain boundaries is 40% or more and an area ratio of crystal grains with Cube orientation is 20% or more, on a rolled surface; and 0.2% proof stress is 900 MPa or more and conductivity is 30% IACS or more.