| 摘要 |
A steel wire according to an aspect of the present invention includes a predetermined chemical composition, in which a wire diameter R of the steel wire is 1.0 mm to 3.5 mm, a soft portion is formed along an outer circumference of the steel wire, the Vickers hardness of the soft portion is lower than that of a position of the steel wire at a depth of 1/4 of the wire diameter R by Hv 30 or higher, the thickness of the soft portion is 5 µm to 0.1 xR mm, the metallographic structure of a center portion of the steel wire contains 95% to 100% of pearlite by area%, the average lamellar spacing of pearlite in a portion from a surface of the steel wire to a depth of 5 µm is less than that of pearlite at the center of the steel wire, the difference between the average lamellar spacing of pearlite in the portion from the surface of the steel wire to the depth of 5 µm and the average lamellar spacing of pearlite at the center of the steel wire is 3 nm to 60 nm, and the tensile strength is 1100 MPa or higher. |
