Process for producing high-nodularity fastener wire rod

Abstract

The invention discloses a process for producing a high-nodularity fastener wire rod. The process comprises the following steps: (1) selecting materials, namely selecting a steel wire with the model of SWRCH22A; (2) drawing, namely drawing the steel wire by adopting a drawing machine, wherein the compression rate is more than or equal to 50 percent; (3) performing spheroidizing annealing, namely lifting the steel wire into an atmosphere protection furnace, adding a protective atmosphere into the atmosphere protection furnace, heating the steel wire to a temperature which is 20-30 DEG C higher than the austenite transformation temperature, preserving the heat for 4-6 hours, slowly cooling to a temperature which is 20-30 DEG C lower than the austenite transformation temperature at a rate of 10 DEG C per hour, preserving the heat for 3-4 hours, and performing furnace cooling until the product is discharged out of the furnace; and (4) performing precision drawing, namely drawing the steel wire again by adopting the drawing machine, wherein the compression rate is less than or equal to 10 percent. The treated steel wire has the grain size of more than or equal to 10 grades, the grains are uniform, the nodulizing grade is more than or equal to 5, the nodulizing rate is high, the pearlite is uniform in distribution, and the wire rod does not have abnormal tissues, has high plastic deformation capacity and is suitable for subsequent plastic forming, and the wire rod with excellent size and surface is obtained.

Description

technical field [0001] The invention relates to the technology in the field of metal material annealing technology, in particular to a production technology of a high-spheroidization rate fastener wire. Background technique [0002] The forging of auto parts is mainly the forging processing of ferrous metals, among which low-carbon alloy steel and low-carbon steel are the most widely used. Commonly used forged steels include 20CrMo, 10 steel, 20 steel, 20CrMnTi, 20Cr and so on. Foreign steel manufacturers have steels specially developed for the cold forging industry, such as Japan’s SWRCH8A, SWRCH18A, and SWRCH22A. These steels have good forging properties and heat treatment properties, small deformation resistance, uniform metallographic structure, and good surface quality. In particular, foreign steel mills have disk-round alloy steel specially used for high-speed horizontal multi-station cold forging machines. application in production. Domestic steel varieties have al...

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Problems solved by technology

[0003] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a production process for fastener wires with high spheroidization rate, which can effectively solve the dimensional stability during the forging process caused by the unreasonable existing annealing process. Poor performance and high forging cost

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