Abstract: The present invention relates to an optical fiber composite ground wire using a composite material. More particularly, the present invention relates to an optical fiber composite ground wire using a composite material, which has simple structure, light weight, improved tensile strength, and reduced electrical resistance.

Abstract: Disclosed are a method for manufacturing a nonmagnetic high-nitrogen steel wire, and an overhead power line adopting the high-nitrogen steel wire as the core thereof. According to one embodiment, the method for manufacturing high-nitrogen steel wire comprises the steps of injecting argon (Ar) gas to reach atmospheric pressure after having first adjusted the pressure to 6×10?5 torr for an initial vacuum using a pressurized vacuum induction melting (VIM) furnace; and injecting nitrogen gas to reach a pressure of 2 atmospheres after having first adjusted the pressure to 6×10?5 torr for a second vacuum, and melting a nitrogen steel alloy consisting of 25 to 35 wt % of Mn, 25 to 35 wt % of Cr, 10 to 20 wt % of Ni, 0.5 to 1.0 wt % of C, and 20 to 35 wt % of Fe, which are alloy elements constituting nitrogen steel. The high-nitrogen steel wire manufactured in this manner has a nitrogen content ratio higher than 12,000 ppm, excellent mechanical strength, and nonmagnetic characteristics.

Abstract: Disclosed are a method for manufacturing a nonmagnetic high-nitrogen steel wire, and an overhead power line adopting the high-nitrogen steel wire as the core thereof. According to one embodiment, the method for manufacturing high-nitrogen steel wire comprises the steps of injecting argon (Ar) gas to reach atmospheric pressure after having first adjusted the pressure to 6×10?5 torr for an initial vacuum using a pressurized vacuum induction melting (VIM) furnace; and injecting nitrogen gas to reach a pressure of 2 atmospheres after having first adjusted the pressure to 6×10?5 torr for a second vacuum, and melting a nitrogen steel alloy consisting of 25 to 35 wt % of Mn, 25 to 35 wt % of Cr, 10 to 20 wt % of Ni, 0.5 to 1.0 wt % of C, and 20 to 35 wt % of Fe, which are alloy elements constituting nitrogen steel. The high-nitrogen steel wire manufactured in this manner has a nitrogen content ratio higher than 12,000 ppm, excellent mechanical strength, and nonmagnetic characteristics.