Abstract: There is provided a copper alloy consisting of: Ni: 10 to 15% by weight, Sn: 5.0% by weight or more, Mn: 0 to 0.5% by weight, Zr: 0 to 0.5% by weight, at least one selected from the group consisting of Nb, Fe, Al, Ti, B, Zn, Si, Co, P, Mg, and Bi: 0 to 0.2% by weight in total, and the balance being Cu and inevitable impurities. The copper alloy has, in an X-ray diffraction profile, (i) a peak in the vicinity of 2?=46 to 50° having a peak intensity of 30% or more with respect to a peak intensity in the vicinity of 2?=84 to 88° and (ii) a peak in the vicinity of 2?=40 to 42° having a peak intensity of 2.0% or more with respect to a peak intensity in the vicinity of 2?=84 to 88°.

Abstract: There is provided a copper alloy consisting of: Ni: 10 to 15% by weight, Sn: 5.0% by weight or more, Mn: 0 to 0.5% by weight, Zr: 0 to 0.5% by weight, at least one selected from the group consisting of Nb, Fe, Al, Ti, B, Zn, Si, Co, P, Mg, and Bi: 0 to 0.2% by weight in total, and the balance being Cu and inevitable impurities. The copper alloy has, in an X-ray diffraction profile, (i) a peak in the vicinity of 2?=46 to 50° having a peak intensity of 30% or more with respect to a peak intensity in the vicinity of 2?=84 to 88° and (ii) a peak in the vicinity of 2?=40 to 42° having a peak intensity of 2.0% or more with respect to a peak intensity in the vicinity of 2?=84 to 88°.