MANUFACTURE OF COPPER ALLOY HAVING FINE CRYSTALLINE GRAINS AS WELL AS LOW STRENGTH

PURPOSE:To obtain the brass-series copper alloy having low strength and excellent in formability as well as excellent in stress corrosion cracking resistance, weld cracking resistance and solderability by subjecting a brass-series copper alloy to cold rolling at a specified amt. or above of draft and thereafter refining its grain size into specified value or below by final annealing. CONSTITUTION:A brass-series copper alloy contg., by weight, 25 to 45% Zn or furthermore contg., at need, total 0.005 to 2.0% of one or >=2 kinds among the group constituted of Pb, Fe, Sn, Al, Mn, Ni, P, As, Te, Cr, Co, Zr, V, Be, Cd, Si, B, In, Ti, Mg, Hf and Ge is cold-rolled at >=75% draft and is thereafter subjected to final annealing to regulate its grain size to