PRODUCTION OF ELECTRIFYING MATERIAL

PURPOSE:To prevent cracking at the time of melting and casting and to produce an electrifying material having high electric conductivity and excellent in migration resistance by exerting cooling from a molten state under specific conditions at the time of melting and casting a copper alloy containing specific percentages of Ni and P. CONSTITUTION:A copper alloy which has a composition consisting of, by weight, 0.5-3.0% Ni, 0.05-0.8% P, and the balance Cu with inevitable impurities and containing, if necessary, 0.1-3.0% Zn or further, as accessory components, 0.001-5.0%, in total, of one or >=2 elements among Ti, Sn, Al, B, As, Sb, Ag, Pb, Be, and Zr is melted and cast. At this time, cooling is performed, at the time of melting and casting, from a molten state down to 600 deg.C at >=5 deg.C/sec cooling rate. By this method, the occurrence of cracks in an ingot can be prevented at the time of melting and casting.