Manufacturing method of wire rod for high-strength tire bead steel wire

Abstract

The invention relates to a manufacturing method of a wire rod for a high-strength tire bead steel wire. The wire rod comprises the following components in percentage by weight: 0.83-0.86% of C, 0.18-0.22% of Si, 0.52-0.58% of Mn, not greater than 0.015% of P, not greater than 0.010% of S, not greater than 0.005% of Al, and the balance Fe and inevitable impurities. The preparation method comprisesa molten iron pretreatment procedure, a converter smelting procedure, an LF refining procedure, a CCM continuous casting procedure, a controlled rolling procedure and a controlled cooling procedure; and the wire rod is dispersed on a stelmor roller way for air cooling after passing through a wire feeding machine. The wire rod is drawn and plated with copper to form finished wires; the sorbitizingtreatment is not needed in the middle; the area reduction rate can reach 93.2%; meanwhile, the wire rod is excellent in strength and toughness matching; the strength of the steel wire is not lower than 2005MPa; the twisting times are not lower than 16 times; and the wire rod can be used for producing the high-strength tire bead steel wire.

Description

technical field [0001] The invention belongs to the technical field of wire rod preparation, in particular to a method for manufacturing a high-strength bead wire wire rod. Background technique [0002] With the rapid development of highways in my country, more and more applications of radial tires have put forward higher and newer requirements for the quality of bead wires and steel cords. In order to reduce environmental pollution and better protect the natural environment, the automobile industry and the tire industry are paying more and more attention to environmental protection requirements and reducing carbon dioxide emissions. Correspondingly, bead steel wire manufacturers need to develop more steel wire products suitable for green tires. On the premise of ensuring the normal performance of tires, improve the performance indicators of bead steel wires and reduce the use of bead steel wires, thereby reducing tire pressure. Weight, reduce fuel consumption during drivin...

AI Technical Summary

Problems solved by technology

At present, most bead wires use specification wire rod production bead wire, Production The area reduction rate of the bead wire is 89.93%. Simply relying on drawing deformation hardening to improve the strength of the bead wire cannot meet the requirements of qualified production. For high-strength bead wire, some manufacturers will use two times of drawing, and perform sorbite treatment in the middle of the two times of drawing to improve the strength of the middle wire to ensure the strength of the finished wire. This method increases the production cost of the steel wire on the one hand, and pollutes on the other hand. surroundings

In addition, some manufacturers try to increase the composition of the original wire rod to increase the strength of the bead wire. However, if the composition of the wire rod increases, the plasticity will decrease, and the torsional performance of the bead wire is unqualified. Therefore, simply increasing the composition of the wire rod cannot meet the requirements. Production of high-strength bead wire

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