The invention discloses a superfine extra-high-strength steel wire, a steel
wire rod for the superfine extra-high-strength steel wire, and a production method of the steel
wire rod. The superfine extra-high-strength steel wire is prepared from the chemical components in percentage by
mass: 0.90 to 0.96 percent of C, 0.12 to 0.30 percent of Si, 0.30 to 0.65 percent of Mn, 0.10 to 0.30 percent of Cr, less than or equal to 0.004 percent of Al, less than or equal to 0.001 percent of Ti, less than or equal to 0.01 percent of Cu, less than or equal to 0.01 percent of Ni, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.0006 percent of O, less than or equal to 0.0006 percent of N, and the balance Fe and inevitable
impurity elements, whereinthe size of an occluded
foreign substance is less than or equal to 4mum, and the average density of the brittle occluded
foreign substance is less than or equal to 2pieces / mm<2>. The steel
wire rod for the superfine extra-high-strength steel wire can be used as
base metal for producing the superfine extra-high-strength steel wire with the
diameter being 50 to 60mum and the tensile strength beinglarger than or equal to 4500MPa, and the mileage without
wire breakage is larger than or equal to 300km in the process of drawing to prepare the superfine extra-high-strength steel wire. The production method comprises the steps of
vacuum induction melting, remelting,
forging and steel rolling.