To provide a hot rolled wire rod with a fine diameter in which the variation of tensile strength in a coil is reduced as hot rolled as for a hot rolled wire rod having a fine wire diameter of 3.0 to <5.0 mm, and also, the execution of cold working (cold drawing) with an annealing stage obviated or simplified is made possible.
This hot rolled wire rod with a fine diameter of <5 mm small in the variation of mechanical properties and small in deformation resistance has steel components containing, by mass, C of 0.01 to 0.6%, Si of 0.35% or less, Mn or 0.1 to 1.0%, and the balance F with inevitable impurities, and in which, in the case the carbon equivalent (Ceq) is defined as Ceq={(C mass %)+(Mn mass %)÷5}, the variation of tensile strength in a coil as for the same carbon equivalent (Ceq) as hot rolled is controlled to 10 MPa or less by a standard deviation.
TASHIRO HITOSHI
SASAKI YOSHIYUKI
