Method for controlling oxide iron scale on surface of low-carbon steel hot rolled wire rod

Abstract

The invention discloses a method for controlling oxide iron scale the surface of a low-carbon steel hot rolled wire rod. The content of C in the low-carbon steel is 0.03-0.08%; the water amount of a water cooling line after finally rolling is adjusted, so that the laying temperature is 820-860 DEG C, and the increase of percentage of red rust or Fe3O4 in the oxide iron scale on the surface is avoided; the adjusting range of the water amount of the water cooling line after finally rolling is 400-1000L / min; a Stelmor air cooling line fan is closed; a shield cover is properly opened; the ratio of FeO in the oxide iron scale of the low-carbon steel is increased, so that the structure ratio of the surface oxide iron scale of the low-carbon steel hot rolled wire rod is as follows: the ratio of FeO to Fe3O4 is 3 to 1; the final thickness of the oxide iron scale of the low-carbon steel hot rolled wire rod is 20-30 microns. By virtue of the method, Fe2O3 red rust on the surface of the low-carbon steel hot rolled wire rod is avoided, the ratio of FeO in the low-carbon steel is increased, and the final thickness of the oxide iron scale of the low-carbon steel hot rolled wire rod is 20-30 microns, so that an optimal mechanical descaling effect of the low-carbon steel hot rolled wire rod is achieved.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a wire drawing type low-carbon steel hot-rolled wire rod, in particular to a method for controlling the surface oxide scale of the low-carbon steel hot-rolled wire rod. Background technique [0002] Drawing low-carbon steel hot-rolled wire rods, especially fiber steel, welding wire steel and other products that need to be drawn, must be mechanically descaled before drawing to remove the oxide scale on the surface of the wire rod before production. After mechanical dephosphorization, it will go through dry drawing and wet drawing processes. When the effect of mechanical descaling is poor, there will be more oxide scales on the surface of the wire rod, and the surface of the mold and steel wire will be scratched during drawing, making the lubrication The effect will decrease, which will affect the life of the drawing die, and will cause broken wires in severe cases. Therefore, improving th...

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Problems solved by technology

[0004] In order to overcome the shortcoming that the iron scale on the surface of wire drawing low-carbon steel hot-rolled wire rod is not easy to be descaled mechanically, the purpose of the present invention is to provide a method for controlling the oxide scale on the surface of low-carbon steel hot-rolled wire rod. Wire temperature and Stelmo controlled cooling process to control the composition and thickness of the scale on the surface of the low carbon steel hot-rolled wire rod, and optimize the composition of the scale on the surface of the low-carbon steel hot-rolled wire rod (FeO, Fe 3 o 4 and Fe 2 o 3 ratio), and control the thickness of its oxide scale at 20-30 μm, so as to eliminate it in the mechanical descaling process

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