Hot-rolled wire rod for 1,960MPa-level cable rope galvanized steel wire and production method

Abstract

The invention discloses a hot-rolled wire rod for a 1,960MPa-level cable rope galvanized steel wire and a production method. The hot-rolled wire rod is prepared from, by weight percent, 0.85%-0.91% of C, 0.20%-1.00% of Si, 0.60%-0.90% of Mn, 0.25%-0.35% of Cr, 0.015%-0.040% of Al, not larger than 0.025% of P, not larger than 0.025% of S, 0.02%-0.07% of V, not larger than 0.20% of Cu, not larger than 0.0030% of Ca and the balance Fe and inevitable impurity elements. Reasonable component contents are adopted in the wire rod, the wire rod has the beneficial effects of being high in tensile strength and plasticity, the situation of hardening during machining in the drawing process can be effectively reduced, and the torsional property of the steel wire obtained through drawing is effectively guaranteed. In the wire rod obtained through the method, the sorbite structure proportion reaches 90% to 93%, the tensile strength of the wire rod is larger than or equal to 1,320 MPa, and the area reduction rate is larger than or equal to 40%. After the wire rod obtained through the method is subjected to drawing, galvanizing and stabilizing treatment, the tensile strength of the steel wire is larger than or equal to 1,960 MPa, the torsion index is larger than or equal to 14 times, and the wire rod can be used for producing the 1,960MPa-level bridge cable rope galvanized steel wire and is suitable for ultra-large-span bridges with the ultrahigh requirement for strength.

Description

technical field [0001] The invention relates to a hot-rolled wire rod, in particular to a hot-rolled wire rod for 1960MPa grade cable galvanized steel wire and a production method thereof. Background technique [0002] With the acceleration of national infrastructure construction, the demand for materials such as galvanized steel wires for bridge cables is increasing. With the increase of bridge spans, the requirements for the strength of steel wires are also getting higher and higher. Research and development of a new generation of wire rods for ultra-high-strength bridge cable wires is an inevitable trend for iron and steel companies to develop high-end products. At present, 1670MPa-level galvanized steel wire for bridge cables is rarely used, and 1770MPa-level galvanized steel wire is becoming the mainstream, and gradually develops to 1860MPa or even higher level. [0003] Among the publicly published documents about steel for bridge cables, the public number CN102181786...

AI Technical Summary

Problems solved by technology

Excessive C and N content in the wire can greatly increase the tensile strength of the steel wire, but will greatly reduce the plasticity, resulting in serious work hardening during the drawing process, and it is difficult to guarantee the torsional performance of the steel wire

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