| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a copper wire formed from pure copper and having high strength and high toughness; a coated electrical wire which uses the copper wire as a conductor; and a method for manufacturing the copper wire. <P>SOLUTION: This manufacturing method includes: subjecting a base material containing 99.9 mass% or more Cu to cold working; then subjecting the base material to intermediate heat treatment; subjecting the obtained intermediate heat-treated material to final cold working to produce a drawn wire having a final wire diameter of 0.1-2.0 mm; and subjecting the drawn wire to final heat treatment. The intermediate heat treatment is conducted when the working degree of the final cold working which is conducted right after the intermediate heat treatment satisfies 85-95%. The copper wire having a fine structure with an average crystal grain size of 20μm or less can be obtained by conducting the intermediate heat treatment so as to control the working degree of the final cold working within a particular range and also conducting the final heat treatment after the final cold working. The copper wire has high strength, high toughness, a tensile strength of 240 MPa or more and an elongation of 20% or more. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
