80 grade cord outer wire winding steel wire rod and production method thereof

Abstract

The present invention provides a 80 grade cord outer wire winding steel wire rod, wherein the components comprise, by weight, 0.78-0.82% of C, 0.20-0.45% of Mn, 0.10-0.18% of Cr, 0.20-0.40% of Si, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 0.0001-0.0004% of K, 0.0015-0.0025% of total oxygen, less than or equal to 0.05% of Cu, and the balance of iron and unavoidable impurities. According to the method, the temperature is controlled at 1530-1590 DEG C and the time is 50-120 min during the LF refining process, the middle ladle liquid steel superheating degree is not higher than 30 DEG C during the continuous casting process, the finishing rolling speed of the steel wire rod is 80-90 m/s, the steel wire rod phase change after the rolling is performed in water, the water temperature is controlled at 96-100 DEG C, the water inlet temperature is 810-890 DEG C, and the water cooling time is controlled at 10-20 s. According to the present invention, no mesh cementite precipitation is generated on the steel wire rod produced by using the method, the drawing diameter of the steel wire rod during the user outer wire winding production process is 0.15-0.18 mm, and the wire breaking rate is not more than 2 times/ton.

Description

technical field [0001] The invention belongs to the field of wire rods for fine processing, and in particular relates to a wire rod for external winding of grade 80 cords and a production method thereof. Background technique [0002] As the competition in the domestic steel cord market intensifies, the manufacturers' demand for domestic wire rods to replace imported wire rods continues to increase. The outer winding part of the steel cord requires the diameter of the steel wire to be small, generally 0.13-0.20mm, and requires a low wire breakage rate during the outer winding process, and the 80-grade wire rod must not exceed 2 times / ton. This puts forward higher requirements for the production of wire rods for outer winding. In order to achieve the purpose of smoothly producing outer winding wires for steel cords, it is necessary to control the cementite precipitation of wire rods for grade 80 wire rods and reduce the broken wires caused by cementite precipitation. [0003...

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Problems solved by technology

[0005] The above-mentioned patents only introduced the chemical composition and production process of ordinary high-strength wire rods, and did not elaborate on the chemical composition and production process of wire rods for external winding

And the Chinese patent whose publication number is "CN101649416A" only introduces the spinning temperature of the wire rod, and the process of rapid cooling before the phase change and the early stage of the phase change, and slow cooling after the phase change. Controlled cooling process parameters

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