Wire rod excellent in drawing processability and method for producing the same

Abstract

An aspect of the present invention relates to a wire rod excellent in drawability comprising, in terms of% by weight, 0.4 to 0.7% of C, 1.2 to 2.3% of Si, 0.1% to 1.0% of Mn, Cr: 0.1 to 1.0%, Al: 0.01% or less, Ti: 0.01% or less, N: 0.001 to 0.007% and balance Fe and unavoidable impurities. The present wire cord satisfies the following relation 1; the amount of impurities present is 1050 pieces / mm2 or less, the proportion of impurities containing Al2O3 is 28% or less and the proportion of impurities containing TiN is 15% or less; the formula is 0.002 <= 0.67Al + 0.5Ti <= 0.011, wherein the symbol of each element in the formula 1 is a weight value % indicating the content of each element.

Description

technical field [0001] The present invention relates to a wire rod excellent in drawability and a method for producing the same. Background technique [0002] The springs used in automobiles mainly include springs for clutches, engines, fuel injection devices, etc. (hereinafter referred to as "engine valve springs"), or suspension springs for suspension devices that ease the impact transmitted by the road surface. [0003] Generally speaking, in the manufacturing process of engine valve springs or suspension springs, it is necessary to undergo a stretching process that changes the diameter of the raw material, that is, the wire, into the wire diameter of the final spring product. The stretching process occupies a very important role in the spring manufacturing process. Partly, therefore, various attempts have been made to improve drawing processability. [0004] For example, according to the description in Patent Document 1, in the overall structure, the area ratio occupied...

AI Technical Summary

Problems solved by technology

However, the effect of the number or size of such hard inclusions on drawability and the optimum alloy composition to ensure cleanliness and drawability are not clearly disclosed

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