82-grade tire cord steel with coarse tensile fracture rate lower than 3 times per thousand tons and production method thereof

Abstract

The invention particularly relates to a 82-grade tire cord steel with a rough tensile wire fracture rate lower than 3 times per thousand tons and a production method thereof, and belongs to the technical field of steel preparation. The method thereof comprises the steps of molten iron desulfurization, converter smelting, argon blowing, LF furnace treatment, square billet continuous casting, square billet heating, high-speed wire rolling, stelmor controlled cooling and coil collection, rapid cooling treatment is carried out at the temperature of 650 DEG C or above, the enough supercooling degree can be guaranteed, and abnormal precipitation of cementite is avoided; and the growth time of a pearlite can be prolonged by slowly cooling at 650 DEG C, so that the lamellar spacing of the pearlite is larger, and an oxide scale is thicker and more compact. According to the 82-grade tire cord steel with the rough tensile wire fracture rate lower than 3 times per thousand tons and the production method thereof, the large interval between pearlite lamellas can ensure that a wire rod has high plasticity, the oxide scale is thick and compact, the stripping integrity of the oxide scale in the rough drawing process can be improved, the situation that the surface of the wire rod is scratched due to the fact that the fine oxide scale is adhered to a rough drawing wheel is avoided, and the surface quality of the wire rod is ensured.

Description

technical field [0001] The invention belongs to the technical field of steel preparation, and in particular relates to 82-grade cord steel with a rough drawing broken wire rate lower than 3 times per thousand tons and a production method thereof. Background technique [0002] Cord steel wire rod is the raw material for manufacturing tire meridians. The demand exceeds 2 million tons and is increasing year by year. The downstream deep processing process is lengthy, including a total of more than 20 passes of drawing and heat treatment. The iron scale on the surface of the wire rod needs to be removed before continuous cold drawing. With the increasingly stringent requirements of the society for energy conservation and environmental protection, the iron oxide scale removal process of the cord steel wire rod is changed from the previous pickling to mechanical removal. Scales, which also lead to changes in the user's requirements for the thickness of the oxide scale on the surfac...

AI Technical Summary

Problems solved by technology

Although the rough breaking of the cord steel wire rod is manifested in various forms, the main reason can be attributed to the low plasticity of the wire rod, which is not enough to make up for its surface defects

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