Method of manufacturing a superior high-strength fine steel wire of ductility and fatigue characteristics

摘要

PROBLEM TO BE SOLVED: To provide high strength extra-fine steel wire having tensile strength of 4,200 MPa or more and excellent in ductility and fatigue characteristics.;SOLUTION: As to this high strength extra-fine steel wire excellent in ductility and fatigue characteristics, in steel wire having a composition containing, by mass, 0.85 to 1.1% C, 0.05 to 2.0% Si and 0.2 to 2.0% Mn or moreover containing one or more kinds selected from C 0.05 to 2.0% Cr, 0.1 to 1.0% Ni, 0.01 to 0.5% Ni and 0.001 to 0.1%, and the balance Fe with inevitable impurities, a pearlitic structure subjected to wire drawing is provided, and the difference between the maximum value and the minimum value in the concentration of C in ferrite is also 1.3 atomic % or less.;COPYRIGHT: (C)2001,JPO