HIGH-STRENGTH ULTRA-FINE STEEL WIRE AND MANUFACTURING METHOD THEREFOR

摘要

The present invention provides a steel wire, including chemical components of: C: 0.7-1.2 mass%; Si: 0.05-2.0 mass%; and Mn: 0.2-2.0 mass%, with a balance including Fe and inevitable impurities, in which the steel wire has a pearlite structure, the average C concentration at a center portion of a ferrite phase in an outermost layer of the steel wire is 0.2 mass% or lower, and a residual compressive stress in the longitudinal direction of the steel wire in the outermost layer is 600 MPa or more.