Steel Wire And Machine Component

Abstract: A steel wire and an application thereof are provided. The steel wire has a predetermined chemical composition, in which, with the content at mass% being denoted by (element symbol%): DI, which is 0.311 × (C%)0.5 × (1 + 0.64 × (Si%)) × (1 + 4.10 × (Mn%)), is between 1.40 and 4.50 both inclusive; the total area ratio of ferrite and martensite in the metal structure in a 1/4D portion from the surface is 30.0% or less, where D is diameter; the tensile strength is between 860 × F1 + 450 MPa and 920 × F1 + 670 MPa both inclusive, where F1 = (C%) + 0.10 × (Si%) + 0.18 × (Mn%) + 0.20 × (Cr%); (tensile strength - 0.2% proof stress) / the value of uniform elongation is 20 + 25 × (C%) or less; and drawing is 66 - 48 × (C%) or more.

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