COPPER ALLOY SHEET AND METHOD OF MANUFACTURING COPPER ALLOY SHEET

摘要

According to one embodiment, a copper alloy sheet comprises 28.0 to 35.0 mass% of Zn, 0.15 to 0.75 mass% of Sn, and 0.005 to 0.05 mass% of P, with the remainder being Cu and inevitable impurities, wherein each correlation of 44 = [Zn] + 20 × [Sn] = 37 and 32 = [Zn] + 9 × ([Sn] ? 0.25)1/2 = 37 is satisfied. According to one embodiment, the copper alloy sheet is produced by production steps that include a step for a final cold rolling step whereby a copper alloy material is cold rolled, wherein the average crystal grain size of the copper alloy material is between 2.0 and 7.0 µm, and the total of the surface area percentage of ß phase and surface area percentage of ? phase in the metal composition of the copper alloy material is between 0% and 0.9%.