| 摘要 |
The fine steel wire according to the present invention has a high strength and high toughness, and can be used as a rubber reinforcing material for a belt cord or tire cord, or as missile wires. The wire rod, used as starting material for this wires contains 0.85- 1.2 wt% of C, less than 0.45 wt% of Si, 0.3- 1.0 wt% of Mn, one or more elements selected from the group consisting of 0.1- 4.0 wt% of Ni and 0.05- 4.0 wt% of Co, the balance being essentially Fe and inevitable impurities A1, N, P and S, which are limited at maxima of 0.005 wt% for A1, 0.005 wt% for N, 0.02 wt% for P and 0.015 wt% for S. The average area ratio of the pro-eutecoïd cementite in the as-rolled state or in the rolled and heat-treated state is 10% or less. The fine steel wires can be obtained by drawing wire rods like descibed before, while applying working strain such that the total area reduction in the final wire drawing step equals or exceeds 95%. <IMAGE> |
