Patent ID: 9394589
Filing Date: 2016-07-19
CPC Classification: C22C,C22F,H01B

Claim Text:
1. A copper alloy for electronic materials characterized in that said copper alloy contains Ni: 1.0-2.5% by mass, Co: 0.5-2.5% by mass, Si: 0.3-1.2% by mass, Cr: 0.09 to 0.5% by mass, and the remainder consisting of Cu and unavoidable impurities, wherein the average grain size at the plate thickness center is 20 μm or less, and wherein the number of crystal grains contacting the surface which have a major axis of 45 μm or greater is 5 or less per 1 mm in a rolling direction length, said rolling direction length being the direction in which the copper alloy was rolled during formation from an ingot.