Ultrahigh-strength steel cord

The utility model discloses an extra-high-strength steel cord which comprises a core strand and an outer layer strand, and the core strand is composed of two core steel wires and is not twisted; the outer-layer strand is formed by weaving and twisting two surface steel wires around the core strand; the core steel wire and the surface steel wire have the same diameter; the extra-high-strength steel cord is used in a radial tire body or a belted layer, and the extra-high-strength steel cord has good rubber permeability, so that the anti-fatigue performance of a tire can be greatly improved; compared with a conventional 2 + 2 * 0.25 HT structural steel cord, the steel cord with the extra-high strength has the advantages that the wirecord fabric strength index of the steel cord with the extra-high strength is increased, and the cord fabric weight index of the steel cord with the extra-high strength is decreased under the condition of equal cord fabric strength, so that the use amount of the steel cord with the ex