High-carbon steel wire rod and production method thereof

Abstract

The invention discloses a high-carbon steel wire rod and a production method thereof. The production method comprises the processes of molten steel smelting, continuous casting, cogging, high-speed wire rolling, temperature-controlled cooling and salt bath heat treatment which are carried out in sequence, wherein in the cogging process, the temperature of a soaking zone is 1200-1250 DEG C, and the soaking time is longer than or equal to 6 hours; in the temperature-controlled cooling process, the wire rod is subjected to temperature-controlled cooling on a Stelmor cooling line; and in the salt bath heat treatment process, the wire rod subjected to temperature-controlled cooling is firstly heated after being paid off, the heating temperature is 920-980 DEG C, then the wire rod is sent into a salt bath pot to be subjected to isothermal phase change, and the cooling rate before isothermal phase change is larger than or equal to 30 DEG C / s. The prepared high-carbon steel wire rod comprises the following chemical components in percentage by mass: at least one of 0.001 to 0.050 percent of Al, 0.01 to 0.09 percent of V, 0.01 to 0.05 percent of Nb and 0.01 to 0.05 percent of Ti, 0.85 to 1.05 percent of C, 0.25 to 1.20 percent of Si, 0.30 to 0.90 percent of Mn, 0.25 to 0.40 percent of Cr and the balance of Fe and inevitable impurity elements; and the high-carbon steel wire rod is high in strength, good in plasticity and toughness, and good in same-circle mechanical property uniformity.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, relates to a production method of a high-carbon steel wire rod, and also relates to a high-carbon steel wire rod prepared by the production method. Background technique [0002] Poor uniformity of steel can easily lead to uneven stress on steel products during service, which affects the safety of steel products. In particular, the poor uniformity of the mechanical properties of the same coil of the wire rod will directly lead to a high rate of wire breakage in the drawing process by downstream users, and the steel wire prepared by drawing is also prone to breakage during service. The poor uniformity of the mechanical properties of the same coil is mainly manifested in the large difference in the tensile strength of the same coil, the large range of the area shrinkage of the same coil, and the extreme difference in the elongation of the same coil. Wait for several aspects. For ex...

AI Technical Summary

Problems solved by technology

For example, the extreme difference in tensile strength of ordinary 82B wire rod is even as high as 120MPa, which seriously affects the service life of steel wire and the safety factor in use

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