| abstract |
(57) [Summary] [PROBLEMS] To produce a steel wire and a steel bar capable of achieving an improvement in deformability and a reduction in deformation resistance after spheroidizing treatment and realizing excellent cold forgeability, and such a steel wire and a steel bar. Provide a useful method for SOLUTION: C: In a steel wire rod or a steel bar containing 0.2 to 0.6%, a fraction of proeutectoid ferrite is 5 to 30% by area, and the remainder consists of a structure mainly composed of bainite. The average value of the lath interval of cementite in the medium is 0.3 μm or more. |