Quality control detection method and application of hot-rolled high-carbon wire rod for high-strength stranded wire

Abstract

The invention discloses a quality control detection method and application of a hot-rolled high-carbon wire rod for a high-strength stranded wire, and the quality control detection method comprises the following steps: firstly, cooling the hot-rolled wire rod on a C-shaped hook until the temperature is less than 50 DEG C, cutting off a non-cold section of the head of the wire rod on a rolling line, and then cutting a sample strip with the length of less than or equal to 500mm; straightening the wire rod sample by adopting a straightening machine, putting the straightened wire rod sample into a heating furnace for artificial aging at the aging temperature of 150 + / -10 DEG C for 3 + / -0.5 h, taking out the sample after the aging is finished, and cooling the sample to room temperature in still air; and carrying out a tensile test on the prepared sample strip on a mechanical tensile testing machine, detecting the tensile strength and the percentage reduction of area after breaking, judging the sample with the tensile strength within the standard range of the wire rod, and finally obtaining the corresponding network carbide grade. The method can be used for rapidly and accurately detecting the highest-grade network carbide in the wire rod and preventing and controlling the wire rod with the grade exceeding the standard from flowing out.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a quality control detection method and application of a hot-rolled high-carbon wire rod for high-strength stranded wire. Background technique [0002] The C content of hot-rolled high-carbon steel wire rods for high-strength strands is generally not less than 0.77%, which belongs to hypereutectoid steel. In order to improve the drawing performance of this type of wire rod and improve the drawing efficiency of downstream factories, steel mills strictly control the content of sorbite in the structure to not less than 85%, and strictly control the grade of reticular cementite. However, due to the random nature of metallographic testing, the cross-sections of randomly intercepted wire rods are not representative, resulting in the outflow of reticular carbide or martensitic wire rods with excessive grades, causing complaints of broken wires from downstrea...

AI Technical Summary

Problems solved by technology

However, due to the random nature of metallographic testing, the cross-sections of randomly intercepted wire rods are not very representative, resulting in the outflow of reticular carbide or martensitic wire rods with excessive grades, causing complaints of broken wires from downstream wire drawing users

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