System and method for cooling high-carbon steel wire rod after rolling

Abstract

The invention discloses a system for cooling a high-carbon steel wire rod after rolling. The device comprises a Stelmor controlled cooling device and a gas fog pre-heating device, wherein the gas fog pre-heating device is arranged on a roller path between a laying head and the Stelmor controlled cooling device. The invention further discloses a method for cooling a high-carbon steel wire rod after rolling. The method comprises the following steps of: controlling the temperature difference among different areas of a rod body to be below 100 DEG C by using the high thermal conductivity of convection vapor during gas fog pre-cooling; and entering the Stelmor controlled cooling device at the temperature of 650-750 DEG C for performing Stelmor cooling. Compared with a wire rod subjected to salt treatment, the finally obtained wire rod in the invention has the advantages that: the mechanical performance and microscopic structure are very close, the tensile strength of cold drawing can be met, and environmental pollution is greatly lowered.

Description

technical field [0001] The invention relates to wire cooling technology, and more particularly, to a post-rolling cooling system and method for high-carbon steel wire rods. Background technique [0002] At present, there are two existing post-rolling cooling processes for high carbon steel wire rods, one is the Steyrmore controlled cooling method, and the other is the salt bath treatment process. The former is the most popular and widely used in the world. By adjusting the air volume of the cooling fan and adjusting the air volume distribution in the direction perpendicular to the running direction of the wire rod, it assists the speed difference between the wire rod dropping device and the different sets of roller tables. To control the microstructure and properties of the wire rod, although it has little impact on the environment, it can only meet the general requirements for the production of high-carbon steel wire rods, but cannot produce high-performance wire rods with ...

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Problems solved by technology

However, due to the fact that the distribution of the wire rod on the roller table is different from the theoretical situation in actual production, please refer to the attached figure 1 As shown, the two sides of the wire rod 2 rolled by the laying machine 1 are not neat and uniform, and the cooling of each area of ​​the wire rod 2 is uneven, especially the outer part of the overlapping area H is over-cooled, resulting in the entire cooling after cooling The microstructure fluctuates greatly on the wire rod 2, and the proportion of upper bainite is high

Therefore, although this method can make the mechanical properties of the wire rod close to the salt bath treatment, the broken wire rate in the subsequent cold drawing process is much higher than that of the wire rod produced by the ordinary Stelmore process or the salt bath process.

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