Thermal treatment wire rod for 2000MPa-grade cable steel wire and production method

Abstract

The invention provides a thermal treatment wire rod for a 2000MPa-grade cable steel wire and a production method. The thermal treatment wire rod is prepared from the following components in percentage by weight: 0.85 to 1.0 percent of C, 0.80 to 1.5 percent of Si, 0.30 to 0.80 percent of Mn, 0.20 to 0.80 percent of Cr, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.01 to 0.08 percent of Al, and the balance of Fe and inevitable impurities. According to the thermal treatment wire rod for the 2000MPa-grade cable steel wire and the production method disclosed by the invention, through special design of the components, the wire rod is produced through processes of smelting, continuous casting, blank casting and grinding, steel rolling and off-line thermal treatment, and the sorbitizing rate of the wire rod is greater than 95 percent, tissues are homogenized, and quenching tissues such as network carbide and martensite are avoided. After the wire rod is subjected to drawing, zinc (aluminum) plating, and stabilization treatment, the strength of the steel wire is greater than or equal to 2000MPa, so that the wire rod can be used for producing the 2000MPa-grade cable zinc (aluminum) plating steel wire for bridges, and is applied to bridges requiring extra long-span and ultrahigh strength.

Description

technical field [0001] The invention belongs to the technical field of metal wire manufacture, and in particular relates to a heat-treated wire rod for galvanized or aluminized steel wires of 2000 MPa grade cables and a production method. Background technique [0002] In recent years, with the needs of our country's economic development, the transportation infrastructure has been booming, and the number of super-long-span suspension bridges has increased rapidly. With the increase of the span and the number of lanes, the steel wires of the main cables of suspension bridges at home and abroad are in the stage of ultra-high strength development, and the continuous improvement of the tensile strength of the steel wires has become the development trend of bridge cables. The tensile strength of bridge main cable steel wire has been maintained between 1570 MPa and 1670 MPa for a long time. In recent years, it has rapidly passed 1770 MPa and 1860 MPa levels, and 2000 MPa has become...

AI Technical Summary

Problems solved by technology

Although this method can improve the strength of the wire rod, the torsion performance of the steel wire product cannot meet the use requirements due to the difficulty in controlling the precipitated particles in the process of controlled rolling and controlled cooling of the wire rod.