Wire rod for high-carbon steel wire and preparation method of wire rod

Abstract

The invention discloses a wire rod for a high-carbon steel wire and a preparation method of the wire rod. The wire rod comprises the following chemical components by weight percent: 0.68-0.88% of C, 0.15-0.30% of Si, 0.45-0.55% of Mn, less than or equal to 0.015% of P, less than or equal to 0.02% of S, less than or equal to 0.05% of Ni, less than or equal to 0.01% of Ti, less than or equal to 0.05% of Al, less than or equal to 0.006% of N, 0.05-0.50% of Cr or / and 0.05-0.25% of V and the balance of Fe. The preparation method comprises the procedures of hot metal pretreatment, converter smelting, LF refining, continuous casting, heating, wire rolling and cooling and the like. Compared with original 70 steel, the wire rod prepared by micro-alloying treatment of a 70 steel wire rod has the advantages that the tensile strength is improved by 90-120 MPa while the percentage elongation is only reduced by 5-20%, and the wire breakage ratio during follow-up drawing into a steel wire is 1.8-2.3 times / ton.

Description

1. Technical field: [0001] The invention belongs to the technical field of wire rods for fine processing, and in particular relates to a wire rod for high-carbon steel wires and a preparation method thereof. 2. Background technology: [0002] High-carbon steel wire rod is rolled from high-quality carbon structure. It is one of the most widely used varieties in wire rods. It is mainly used to make various types of steel wires, steel cords, steel strands, steel nails and steel wire ropes. As the competition in the domestic steel cord market intensifies, the demand of domestic manufacturers for domestic wire rod suppliers 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, the general processing diameter is 0.13-0.20mm, and the broken wire rate in the outer winding process is required to be low, not more than 1 time / ton; the 80-grade wire rod should not be more than 2 times / ton . ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: according to the existing high-carbon steel wire rod 70 steel that cannot meet the performance requirements, instead of using high-carbon 80 steel, it provides a high-carbon steel that has been improved by microalloying. 70 steel to solve; that is, the invention provides a kind of high-performance high-carbon steel wire wire rod and its preparation method