Patent ID: 8142577

Claim:
A high strength wire rod having a high reduction of area, comprising: in mass %, C: 0.7 to 1.2%, Si: 0.35 to 1.5%, Mn: 0.1 to 1.0%, N: 0.001 to 0.006%, Al: 0.005 to 0.1%, B: 0.0004 to 0.0060%, wherein a solid-solubilized amount of B is approximately, by mass %, at least 0.0002%, and the balance consisting of Fe and unavoidable impurities, wherein a tensile strength (MPa) of the wire rod is specified by the following formula, TS≧[1000×C content (%)−10×wire rod-diameter (mm)+450], wherein the reduction of area after breaking of the wire rod is 35% or more with the tensile strength of the wire rod of 1190 MPa or more, wherein, in a surface portion from a surface to a depth of 100 μm of the wire rod, an area fraction of a non-pearlite structure is present in the wire rod and is at most 10%, and the balance is composed of a pearlite structure, wherein in a section from the surface to a central portion of the wire rod, an area fraction of a non-pearlite structure is present in the wire rod and is at most 5%, and the balance is composed of a pearlite structure, wherein a diameter of the wire rod is 5.0 mm to 18.0 mm, and wherein the non-pearlite structure is composed of at least one of a pro-eutectoid ferrite, a degenerate-pearlite, or a bainite generating along grain boundaries of a prior austenite.