Patent ID: 8864920

Claim:
A high strength wire rod which is subjected to a patenting treatment directly after performing a hot-rolling procedure, comprising: one or more portion having a component composition including, in mass %, C: 0.7 to 1.2%, Si: 0.6 to 1.5%, Mn: 0.1 to 1.0%, N: 0.001 to 0.006%, Al: 0.028 to 0.1%, and B: 0.0009 to 0.0060%, wherein a solid-solubilized amount of B is 0.0002% to 0.0060%; and a balance includes Fe and inevitable impurities, and wherein: a tensile strength TS (MPa) of the wire rod is specified by the following formula: TS >(1000× C content (%)−10×wire-diameter (mm)+320); a diameter of the wire rod is 5.0 mm to 18 mm, an area fraction of a pro-eutectoid ferrite is at most 3%, an area fraction of a pearlite structure in the wire rod is 90% or more, and a reduction of an area after breaking of the wire rod is 40% or more with the tensile strength of the wire rod of 1140 MPa or more.