Patent ID: 9644251
Date: 2017-05-09
CPC Classifications: C22C,C22F

Claim:
1. A copper alloy plate consisting of, by mass %: 0.05% to 0.2% of Zr; and a remainder including Cu and unavoidable impurities, wherein an average value of KAM values measured by an EBSD method using a scanning electron microscope equipped with a backscattered electron diffraction image system is 1.5° to 1.8°, an R/t ratio is 0.1 to 0.6 in which R represents the minimum bending radius which does not cause a crack, and t represents the thickness of the plate in a W bending test, and bending elastic limit is 420 N/mm wherein the copper alloy plate is produced by a process including hot-rolling, solution treatment, cold rolling, aging treatment and heat treatment in this order, a Vickers hardness of the surface of the copper alloy plate after the heat treatment is decreased from a Vickers hardness of the surface of the copper alloy plate after the aging treatment by 3 Hv to 20 Hv.