A copper alloy material in the form of a wire or bar to form a network structure used in demar water, containing the copper alloy material: 62 to 91% by mass of Cu; from 0.6 to 3.0% by mass of Sn; at least one element X2 selected from the group consisting of 0.02 to 1.5% by mass of Al, from 0.05 to 1.5% by mass of Mn, from 0.02 to 1.9% in mass of Si, and from 0.005 to 0.5% by mass of Ni; and optionally at least one element X1 selected from the group consisting of 0.02 to 0.25% by mass of As, from 0.02 to 0.025% by mass of Sb, from 0.001 to 0.2 % by mass of Mg, and from 0.01 to 0.25% by mass of P, the remainder being Zn and impurities unavoidable; and the composition meets the relationship derived from the content of Cu [Cu], the content of Sn [Sn], the content of P [P], the total content in X1 [X1] except P, the content of Al [Al], the content of Mn [Mn], the content of Si [Si] and the content of Ni [Ni] in terms of mass%: 62 <;= [Cu] - 0, 5 [Sn] - 3 [P] - 0, 5 [X1] - 3, 5 [Si] - 1, 8 [Al] + [Mn] + [Ni] º <;= 90, and in which the total area ratio of the phase a and optionally the phases V and is from 95 to 100%.Un material de aleación de cobre en forma de hilo o barra para formar una estructura de red usada en agua demar, conteniendo el material de aleación de cobre: del 62 al 91% en masa de Cu; del 0, 6 al 3, 0% en masa de Sn; al menos un elemento X2 seleccionado entre el grupo que consiste en del 0, 02 al 1, 5% en masa de Al, del 0, 05 al 1, 5% en masa de Mn, del 0, 02 al 1, 9% en masa de Si, y del 0, 005 al 0, 5% en masa de Ni; y opcionalmente al menos un elemento X1 seleccionado entre el grupo que consiste en del 0, 02 al 0, 25% en masa de As, del 0, 02 al 0, 25% en masa de Sb, del 0, 001 al 0, 2% en masa de Mg, y del 0, 01 al 0, 25% en masa de P, siendo el resto Zn e impurezas inevitables; y la composición cumple la relación derivada del contenido de Cu [Cu], el contenido de Sn [Sn], el contenido de P [P], el contenido total en X1 [X1] excepto P, el conteni