| 摘要 |
This steel wire contains, in terms of mass%, 0.95-1.10% C, 0.10-0.70% Si, 0.20-1.20% Mn, 0.90-1.60% Cr, 0-0.25% Mo, 0-25 ppm B, 0-0.020% P, 0-0.020% S, 0-0.0010% O, 0-0.030% N, and 0.010-0.100% Al. In the steel wire, the surface layer region has a Vickers hardness of HV300-HV420, an areal pearlite proportion of 80% or greater, and an areal pro-eutectoid cementite proportion of 2.0% or less, and the areal proportion of pearlite blocks having an equivalent circular diameter exceeding 40 µm in the surface layer region is 0.62% or less. In the steel wire, the inner part region has an areal pearlite proportion of 90% or greater and an areal pro-eutectoid cementite proportion of 5.0% or less. The difference in Vickers hardness between the surface layer region and the center part is HV20.0 or less. |
