Coil rod for pre-stressed steel strand and production method of coil rod

Abstract

The invention discloses a coil rod for a pre-stressed steel strand and a production method of the coil rod. The production method comprises the following steps: smelting in a rotary furnace; refining in an LF; continuously casting; heating; carrying out controlled rolling and controlled cooling. In the continuous casting step, a casting blank consists of the following chemical components in percentage by weight:0.78-0.82 percent of C, 0.20-0.25 percent of Si, 0.75-0.80 percent of Mn, 0.20-0.25 percent of Cr, smaller than or equal to 0.012 percent of P, smaller than or equal to 0.010 percent of S and 0.02-0.03 percent of V. The controlled rolling and controlled cooling step comprises steps of rolling, spinning, cooling and collecting and coiling; in the rolling step, the rolling temperature is 1000+/-15 DEG C; the precision rolling temperature is 920 to 950 DEG C; in the spinning step, the spinning temperature is 860 to 880 DEG C. According to the method, based on optimization and control of the chemical components, by regulating and controlling the steel rolling process, the sorbite rate of the coil rod is increased, the interlamellar spacing of the sorbite is reduced, and generation of poor tissues is avoided, so that the coil rod has the characteristics of high intensity, high plasticity and low pole difference and satisfies the use requirement that the wire is not broken at a high-pulling speed; the pulling speed is increased; the wire breaking rate is reduced; therefore the production efficiency is improved to some degree.

Description

technical field [0001] The invention relates to a method for manufacturing wire rods, in particular to a method for manufacturing wire rods for prestressed steel strands. Background technique [0002] Prestressed steel strand is a new material with rapid development in China in recent years. It is widely used in railway engineering, high-rise buildings, cross-river cable-stayed bridges, suspension bridges, water conservancy facilities, nuclear power plant domes, sports factory pavilions, offshore platforms, etc. High, heavy and special" key building structure projects, the products are widely used, and the market prospect is good. [0003] SWRH82B has good dimensions and surface quality, and is superior in metallographic structure, decarburization layer and mechanical properties. It can be used to manufacture high-strength prestressed steel strands, galvanized steel strands, etc. It is an important tool for deep processing in the metal products industry. raw material. SWRH...

AI Technical Summary

Problems solved by technology

[0004] At present, the wire rods for prestressed steel strands are mainly SWRH82B, and the production process adopts the traditional technology; the wire rods for prestressed steel strands with a diameter of 12.5mm a

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