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

Abstract

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.

Description

technical field [0001] The invention belongs to the field of galvanized steel wires for bridge cables, in particular to a galvanized steel wire for 2000MPa bridge cables and a manufacturing method thereof. Background technique [0002] The galvanized steel wire of the bridge cable, as the core component of the cable-supported bridge cable, is always in a state of tension and torsion during service, and has extremely strict requirements on its composition design, structure, and mechanical uniformity. [0003] With the rapid development of long-span bridge construction, in terms of saving material consumption, reducing production costs, and adapting to the construction of extra-long-span bridges, the requirements for ultra-high strength and high torsional performance of galvanized steel wires for bridge cables are put forward (such as the torsion value of steel wires required for suspension bridges) ≥14 circles, cable-stayed bridges require steel wire torsion value ≥8 circles)...

AI Technical Summary

Problems solved by technology

At present, all domestic production enterprises have the problem of low torsional pass rate when producing high-strength galvanized steel wire, especially steel wire above 1960MPa.

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