| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an extra-thin wire having high strength of >=35 kgf/mm2 tensiles strength and used as a magnet wire or the like. SOLUTION: A copper alloy wire rod in which the concn. of Ag is controlled to 0.05 to 2.0 wt.%, and the balance copper with inevitable impurities is subjected to wire drawing at a wire drawing ratio of >=50%, and, after that, this wire-drawn copper alloy wire rod is coated with an insulating material under heating at 200 to 400 deg.C, which is baked. By this Ag concn. and heating temp. at the time of the coating and baking, an extra-thin wire having high strength of >=35 kgf/mm2 tensile strength and used as a magnet wire or the like can be obtd.
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