Steel wire rod for superfine steel cord subjected to heat reduction treatment and production process of steel wire rod

Abstract

The steel wire rod comprises the following components in percentage by mass: 0.55 to 0.65 percent of C, 0.40 to 0.60 percent of Mn, 0.15 to 0.30 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.03 percent of Mo, less than or equal to 0.0020 percent of Al, less than or equal to 0.0010 percent of Ti, less than or equal to 0.0020 percent of [O], less than or equal to 0.0050 percent of [N] and the balance of Fe and inevitable impurities. Special molten iron for low-titanium tire cord steel and special silicon iron for low-aluminum and low-titanium are adopted, and the process route of variable slag, constant pulling speed, low-superheat-degree pouring, forced cooling and low-strength controlled cooling is adopted, so that the dimensional precision of the wire rod reaches C-grade precision, the carbon segregation index of a continuous casting billet is within 1.07, the grain boundary cementite of the wire rod is 0 grade, and the maximum width of longitudinal inclusions of the wire rod is below 15 microns; the tensile strength of the steel wire rod is reduced, the percentage reduction of area of the steel wire rod is improved, the steel wire rod has excellent drawing performance, one-time heat treatment can be reduced when the steel wire rod is used for producing the superfine steel cord, carbon emission is reduced, the production efficiency is greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of steel wire rods, and in particular relates to a steel wire rod for heat-reducing ultrafine steel cords and a production process. Background technique [0002] Steel cords are fine-gauge steel strands or ropes made of high-quality high-carbon steel for special purposes. conventional The steel YLX70A wire rod for ultra-fine steel cord and its production process require at least two heat treatments. The wire rod has high tensile strength, relatively poor section shrinkage and plasticity, which affects the drawing performance of the steel wire, and inclusions are easy to cause drawing. The risk of wire breakage and relatively high carbon emissions lead to low production efficiency and high processing costs for users, making it difficult to meet processing needs. SUMMARY OF THE INVENTION [0003] The present invention aims to solve one of the above-mentioned technical problems at least to a certain extent...

AI Technical Summary

Problems solved by technology

conventional The steel YLX70A wire rod for ultra-fine steel cord and its production process require at least 2 heat treatments. The wire rod has high tensile strength, relatively poor shrinkage rate and plasticity of the wire rod section, which affects the dr

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