Wire rod for high-strength prestressed steel strand and preparation method of wire rod

Abstract

The invention discloses a wire rod for a high-strength prestressed steel strand and a preparation method of the wire rod. The wire rod comprises the following main chemical components: 0.98%-1.10% of C, 0.85%-1.20% of Si, 0.30%-0.60% of Mn, 0.15%-0.35% of Cr and the like. Through the element composition design of high C and high Si, the strength of the wire rod is improved; in the preparation process, a high-temperature heating method before continuous rolling cogging is adopted, and diffusion of the C element is promoted; the hot-rolled wire rod adopts an on-line EDC water bath controlled cooling mode, the cooling speed is increased, and the sorbite rate of 90% or above can be obtained; a slow cooling mode is adopted after the wire rod is discharged, internal stress release is promoted, and the drawing performance of the wire rod is improved; the wire rod manufactured through the method is good in structure uniformity and free of low-temperature structures, network cementite is smaller than or equal to the first grade, the tensile strength is 1420-1460 MPa, and the percentage reduction of area is larger than or equal to 25%; and the method can be used for preparing 2230 MPa-grade prestressed steel strand products.

Images