Patent ID: 8859095

Claim:
A wire rod that is hot-rolled into a diameter of 4-8 mm, wherein the wire rod contains, in mass %: C: 0.6 to 1.1%; Si: 0.1 to 0.5%; Mn: 0.2 to 0.6%; S: 0.004 to 0.015%; and Cr: 0.03 to less than 0.05%; with a balance including Fe and inevitable impurities in which P is limited to 0.02% by mass or lower and Al is limited to 0.003% by mass or lower, wherein the wire rod has a pearlite in a peripheral portion which is defined as an area within a depth of 500 μm from a surface of the wire rod, and wherein a crystal plane of a ferrite in the pearlite in the peripheral portion has, in a cross section of the wire rod, a {110} crystal plane having an accumulation degree of the crystal plane being 1.25 or more, and a tensile strength TS (MPa) of the wire rod satisfies 200+980×( C % by mass)< TS< 400+980×( C % by mass) (Equation 1).