COPPER ALLOY FOR ELECTRICAL MATERIAL, PRODUCTION METHOD THEREOF, BAR STRAND USED THEREFOR, COPPER ALLOY FOR ELECTRIC MATERIAL PRODUCED BY USING THE BAR STRAND, AND PRODUCTION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To establish a copper alloy for electrical materials having such a favorable surface characteristic that gilt on a plated product does not come off and its producing method. SOLUTION: The copper alloy for electric materials excellent in the surface characteristic contains at least 1.0-3.0 mass % of Ni, 0.2-0.6 mass % of Si in the composition, and having zero piece/1000 mm<2> of the surface defect of a cracked folding defect larger than 20μm.