Easily-pickled low-carbon steel wire rod and control method of surface scale of easily-pickled low-carbon steel wire rod

Abstract

The invention discloses an easily-pickled low-carbon steel wire rod and a control method for a surface scale of the easily-pickled low-carbon steel wire rod and relates to the technical field of steel rolling. The control method for the surface scale of the easily-pickled low-carbon steel wire rod includes the following steps of: step S1, rolling; step S2, discharging a wire at a temperature of 820 DEG C to 850 DEG C; and step S3, conducting a cooling step, specifically, slowly cooling the low-carbon steel wire rod obtained in the discharging step to a temperature of 580 DE C to 670 DEG C, then conducting quenching treatment to a temperature of 390 DEG C to 410 DEG C, and then conducting air cooling to the room temperature. Through reasonable matching of all the above steps, it is guaranteed that the finally-obtained iron oxide scale is relatively thin and is composed of three different phases (Fe3O4, FeO and Fe2O3) with specific thicknesses; all the phases are distributed in a layered mode, so that the iron oxide scale is compact and not cracked, also contains little Fe3O4, is beneficial for acid pickling; and meanwhile the tensile strength of the prepared easily-pickled low-carbon steel wire rod meets related requirements.

Description

Technical field[0001]The present application relates to the field of steel rolling techniques, and in particular, there is a control method of solu-acid washing low carbon steel strips and a surface iron oxide skin thereof.Background technique[0002]The surface of the low carbon steel bar strip after rolling usually forms the iron oxide skin, in order to avoid the quality of the oxidative skin to affect the quality of the subsequent wire articles, before the disc drawing, it is necessary to use a chemical stripping method or mechanical stripping method to remove the iron oxide skin.[0003]The common peeling mode is a pick-up removal method, a shot blast removal method, a mechanical stripping method, and the like. However, the iron oxide skin is removed by pickling, due to the laminating removal method, a large amount of waste acid and exhaust gas are generated, resulting in environmental pollution, but the iron oxide skin of the low carbon steel bar strip is about 7.35kg / ton, thicke...

AI Technical Summary

Problems solved by technology

However, the use of pickling to remove scale will produce a large amount of waste acid and waste gas, which will cause environmental pollution. However, the weight of scale on the surface of low-carbon steel wire rods currently used is about 7.35kg / ton, which is relatively thick and generally About 20-30μm, usually the pickling time of a wire rod is about 60min, the pickling time is longer, and the acid consumption is large, the cost is high and it is easy to pollute the environment

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