Production process of medium carbon steel surface decarburization controlled hot-rolled wire rod

Abstract

The invention relates to a production process of a medium-carbon steel surface decarburization control hot-rolled wire. The production process comprises such main steps as blank preparation, heating treatment, rolling, spinning / coiling, cooling control (insulation and slow cooling), and packing. Such fine treatments as peeling and polishing are performed on a blank to remove a layer of scale on the surface of the blank, so that a decarburization layer on the blank is removed. The blank is formed by two fire; and one procedure is added to eliminate the surface defects and the decarburization layer. In the heating process, a relation of reaction between the blank and gas in a furnace is researched; and components of reaction residues are detected to control the gas atmosphere in the furnace to find out a reasonable gas-air ratio. The decarburization sensitivity of different steel types is researched; and the steps in the heating furnace and the air steps are adjusted to shorten the blank heating time. The wire is insulated after the spinning / coiling procedure; the depth of the decarburization layer is increased after insulation and slow cooling (equivalent to secondary heating); and a decarburization generation mechanism is researched to add protective gas in an insulation cover to prevent deep decarburization.

Description

technical field [0001] The invention relates to a wire rod hot-rolling production process, in particular to a wire rod hot-rolling production method for controlling surface decarburization of medium-carbon steel. Background technique [0002] The decarburization control production process of medium carbon steel wire mainly includes: billet preparation, heat treatment, pass rolling, spinning / coiling, cooling control, and finishing. Too many, the heating temperature and time are difficult to control, the composition of hot dirty gas is unstable, and the cooling control process is immature, which leads to the fact that the decarbonization process of finished products on the market cannot reach a high level. The carbon content of medium carbon steel is high, and it is particularly difficult to control decarburization in the production process. At present, there is no effective decarburization control process. Contents of the invention [0003] The technical problem to be solv...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a medium-carbon steel surface decarburization control hot-rolled wire rod production process for the above-mentioned prior art, solve the technical problem that the medium-carbon steel surface decarburization control is difficult, and optimize the medium-carbon steel wire rod thermal process. Control Technology of Surface Decarburization in Rolling Production