Wire with tensile strength>=2000MPa for bridge cable and production method

Abstract

The invention discloses a wire with tensile strength>=2000MPa for a bridge cable and a production method. The wire comprises, by weight, 0.95-1.2% of C, 0.1-0.48% of Si, 0.6-1.0% of Mn, 0.1-0.5% of Cr, 0.01-0.05% of V, Cu<=0.05%, 0.05-0.15% of Al, 0.01-0.03% of N, P<=0.025% and S<=0.015%. The production method includes smelting and continuously casting into blanks; heating the casting blanks; rolling; heating again; high-speed rolling; spinning; air cooling to the room temperature; and placing for standby. According to the wire and the method, continuous casting of blooms, rolling starting of billets and high speed wire rolling are adopted, therefore a metallographic structure and the like of the wire for the bridge cable are even, and grains are better refined; and processes of rapid cooling with a large air volume and the like are adopted, therefore the tensile strength of the wire for the bridge cable is >=2000MPa and stable, a twist number reaches >=15, and wire fracture caused by the wire quality does not happen during cold drawing.

Description

technical field [0001] The invention relates to a wire rod and a production method thereof, in particular to a wire rod for a bridge cable and a production method thereof, specifically to a wire rod for a bridge cable with a tensile strength ≥ 2000 MPa and a production method thereof. Background technique [0002] At present, in the production of wire rods for bridge cables, the tensile strength is within 1200MPa to 1900MPa. The disadvantage is that the tensile strength fluctuates greatly and is unstable. This phenomenon is more prominent when the cooling capacity of the Stelmore wire is insufficient when the wire is thicker. [0003] However, as far as the current market is concerned, according to the development of bridges, wires for bridge cables above 2000 MPa are required, so it is more difficult to produce and more difficult to guarantee performance. [0004] Among the publicly published documents that have been checked, there are reports about steel wire rods for bri...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the demand for wire rods for bridge cables with a tensile strength greater than 2000 MPa that cannot meet market requirements at present, and the insufficient strength performance is not stable, and to provide a steel wire with simple composition and a tensile strength greater than 2000 MPa for bridge cables. Stable, torsion value reaches ≥ 15 times, wire rod for bridge cables without wire breakage during cold drawing process and production method

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