Ultrahigh-carbon superfine steel wire water bath heat treatment process

Abstract

The invention relates to an ultrahigh-carbon superfine steel wire water bath heat treatment process. The ultrahigh-carbon superfine steel wire water bath heat treatment process comprises the following specific steps that a, a cleaned steel wire with the diameter of 0.3-0.6 mm and the carbon content of 0.9-1.1% is fed into an austenitizing furnace at the linear speed of 50-70m / min, the temperature in the furnace is controlled at 850-930 DEG C, the heating time is 15-25s, and the tapping temperature is controlled at 800-900 DEG C; b, after the steel wire is discharged from the furnace, the steel wire immediately enters a water bath at 86-95 DEG C for water cooling, the cooling time is less than 0.5s, and the temperature of the steel wire discharged from the water is controlled at 500-600 DEG C; c, after the steel wire is discharged from the water , the steel wire immediately enters a temperature control device for heat preservation, the internal temperature of the temperature control device is controlled to range from 400 DEG C to 550 DEG C, and the running distance of the steel wire in the temperature control device ranges from 3 m to 15 m; and d, the steel wire is air-cooled to room temperature after the steel wire is discharged from the temperature control device, and rolling is performed. Through the process, the temperature change of the ultrahigh-carbon superfine steel wire in the heat treatment process can be effectively controlled, and the metallographic phase inversion process of the ultrahigh-carbon superfine steel wire is effectively controlled, so that the steel wire with the performance meeting the wet drawing requirement is obtained.

Description

technical field [0001] The invention relates to a water-bath heat treatment process for ultra-high carbon ultra-fine steel wire. Background technique [0002] Wet drawing of steel wire is a cold drawing process. Under the action of drawing force, the steel wire of thick gauge is extruded by a die to become a steel wire of fine gauge. Surface shrinkage, after the wet-drawn steel wire is heat-treated before wet-drawing, the metallographic transformation of the steel wire into fine and dense sorbite can effectively improve the surface shrinkage of the steel wire. [0003] However, with the continuous improvement of the cutting process, the diameter of the cutting steel wire is required to be thinner and thinner, which also means that the area shrinkage of the steel wire is getting higher and higher, and the cutting steel wire needs to have extremely high strength. Therefore, the steel wire used for cutting A very high carbon content is required, and the higher the carbon conte...

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Problems solved by technology

[0003] However, with the continuous improvement of the cutting process, the diameter of the cutting steel wire is required to be thinner and thinner, which also means that the area shrinkage of the steel wire is getting higher and higher, and the cutting steel wire needs to have extremely high strength. Therefore, the steel wire used for cutting High carbon content is required, and the higher the carbon content, the thinner the steel wire, the more difficult it is to control the heat treatment process, and the metallographic structure of the steel wire is also difficult to achieve the ideal goal

[0004] At present, when dealing with steel wires with a carbon content of 0.9%-1.1% and a diameter of 0.3mm-0.6mm, due to the fine steel wire specifications, it is easy to produce a supercooled structure during the cooling process after heat treatment, and it is impossible to guarantee a uniform and fine metallographic structure. It is also impossible to guarantee the subsequent wet drawing breakage rate, and it is difficult to achieve a uniform area shrinkage rate that meets the requirements

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