Favorably workable steel wire and method for producing same

Abstract

The present invention provides a steel wire provided with stable workability performance. This steel wire is wire having a steel component containing, in mass%, C in the amount of 0.20-0.60%, Si in the amount of 0.15-0.30%, Mn in the amount of 0.25-0.60%, P in the amount of <=0.020%, and S in the amount of <=0.010%, with the remainder constituting Fe and inevitable impurities, the steel wire being characterized by having cementite as an internal structure, and in that 80% or more, in a unit number ratio, of the cementite in a cross-section perpendicular to the lengthwise direction of the wire has a minor axis of 0.1Mum or less, and an aspect ratio of the major axis to the minor axis of 2.0 or less.

Description

technical field [0001] The feature of the present invention is that in the processing such as forging, which is a representative example of wire drawing and bolt forming, which can be said to be necessary in the manufacturing process for commercialization using wire rods, the internal The processing performance of the steel wire rod can be improved by delaying the formation of micropores, and it can be applied to the general processing field of the steel wire rod. Background technique [0002] In order to improve the workability of steel wire rods, the most commonly used technique in the prior art is a method of performing spheroidizing annealing. In the prior art using spheroidizing annealing, as shown in Patent Document 1, the austenite grain size is often set to 100 μm or more, and the ferrite fraction is set to 20% or less. In particular, Cr is added as a method of promoting spheroidization of cementite after annealing. [0003] In this prior art, in order to ensure fo...

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Problems solved by technology

[0007] However, in Patent Documents 1 to 4, when steel wires are produced by applying severe processing to steel wires, there is no study on the reasons why the steel wires tend to break.

In addition, there is no study on the influence of the behavior of the micropores generated when the steel wire rod is formed into a steel wire on the wire breakage.

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