High tensile nonmagnetic stainless steel wire for overhead electric conductor, low loss overhead electric conductor using the wire, and method of manufacturing the wire and overhead electric conductor

A high tensile nonmagnetic stainless steel wire for a core of a low loss overhead electric conductor, the high tensile nonmagnetic stainless steel wire comprising:

• a nonmagnetic stainless steel wire comprising:
• 0.07 to 0.12% by weight of C;
• 0.05 to 1.00% by weight of Si;
• 4.5 to 12.0% by weight of Mn;
• 16.0 to 19.5% by weight of Cr;
• 2.5 to 6.0% by weight of Ni;
• 0.10 to 3.0% by weight of Cu;
• 0.05 to 0.15% by weight of Nb;
• 0.20 to 0.40% by weight of N;
• 0.01 to 0.10% by weight of Al;
• and
• the remaining percentage weight of Fe and other inevitable impurities, based on the total weight of the nonmagnetic stainless steel wire, wherein the nonmagnetic stainless steel wire having a tensile strength of 180 kg/mm2 or more, elongation of 2.0% or more, and magnetic permeability of 1.02 μm or less,
• wherein the high tensile nonmagnetic stainless steel wire core has 7 nonmagnetic stainless steel wires stranded together, which are then welded by an aluminum welding process to a predetermined thickness to reduce eddy current loss in the core and used as the core of the low loss overhead electric conductor;
• and
• an aluminum-welded layer of thickness 0.47-0.78 mm formed on an outer surface of the nonmagnetic stainless steel wire,
• wherein the tensile strength of the nonmagnetic stainless steel wire increases for a constant temperature over time that allows the aluminum-welded layer formed on the outer surface of the nonmagnetic stainless wire to have an increase in thickness from 0.47 mm to 0.78 mm for increase conductivity by eliminating a discharge of Joule heat from the nonmagnetic stainless steel wire.