| 摘要 |
A wire for a small-diameter, high-fatigue-strength steel wire, or a wire for a steel wire used in a steel wire formed by stranding the wires; a steel wire and a production method therefor. A structure of a wire for a steel wire or a steel wire, obtained by hot-rolling and condition-cooling steel containing 0.6 to 1.3 mass % of C, 0.1 to 1.5 mass % of Si and 0.2 to 1.5 mass % of Mn, comprises an upper bainite structure with a 5 to 50 % area ration (cross-sectionally measured) and a substantially pearlite structure with the remaining area ratio. The production method, wherein a wire having the above components and a diameter of 5 to 16 mm is drawn and patented to be formed into a wire 0.8 to 2.8 mm in diameter, the resultant wire then being austenitized, quenched, subjected to a constant-temperature transformation at 500 to 560 DEG C, conditioned so as to have an upper bainite structure with a 5 to 50 % area ratio and a substantially pearlite structure with the remaining area ratio, brass-plated, and drawn to a diameter of 0.05 to 1.0 mm.
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