2000 MPa-grade bridge cable galvanized steel wire and preparation method thereof

The invention relates to a 2000 MPa-grade bridge cable galvanized steel wire and a preparation method thereof. The steel wire comprises the following chemical components of, in percentage by weight, 0.88%-0.94% of C, 1.05%-1.35% of Si, 0.40%-0.50% of Mn, 0.25%-0.35% of Cr, less than or equal to 0.07% of Cu, and the balance Fe and inevitable impurity elements; and the steel wire further comprises one or more than one of the following components of, in percentage by weight, 0.0005%-0.0015% of B, 0.01%-0.03% of Nb and 0.01%-0.03% of Mo; and the preparation method of the steel wire comprises the following steps of steel wire rod pre-treatment, drawing and hot galvanizing stabilization. The twisting performance of the galvanized steel wire is improved by strictly controlling of the chemical components of the steel wire rod, the surface quality and inclusion as well as optimizing the drawing and a hot galvanizing process; and the tensile strength of the galvanized steel wire produced by themethod can reach the 2000 MPa or above , and the torsion value is not less than 18 circles.