Wire rod for high-strength steel fiber, high-strength steel fiber, and method for manufacturing same
AssigneePosco
InventorsYo-Sep Yang, Manjae Lee, Yong-Sik Park
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Abstract
Disclosed are a wire rod for a steel fiber having a strength of 1,500 MPa or more without performing LP heat treatment during a wire drawing process, a steel fiber and, a method for manufacturing the same. The wire rod for a high-strength steel fiber according to the present disclosure includes, in percent by weight (wt %), 0.01 to 0.03% of C, 0.05 to 0.15% of Si, 1.0 to 2.0% of Mn, 0.05 to 0.15% of P, 0.005% or less (excluding 0) of Al, 0.01% or less (excluding 0) of N, 0.03% or less (excluding 0) of S, 0.02 to 0.08% of Sn, and the remainder of Fe and inevitable impurities, wherein a microstructure is single-phase ferrite.
Claims8
A wire rod for a high-strength steel fiber comprising, in percent by weight (wt %), 0.01 to 0.03% of C, 0.05 to 0.15% of Si, 1.0 to 2.0% of Mn, 0.05 to 0.15% of P, 0.005% or less (excluding 0) of Al, 0.01% or less (excluding 0) of N, 0.03% or less (excluding 0) of S, 0.02 to 0.08% of Sn, and the remainder of Fe and inevitable impurities,
- wherein a microstructure comprises 99.5% or more of ferrite phase by area fraction,
- wherein, in a −D/4 to D/4 range of a transverse cross-section, an area fraction of ferrite having an average grain size of 30 to 50 μm and high angle grain boundaries with a misorientation angle of 15° or more is from 60 to 80%, and
- wherein D represents a diameter of the wire rod.
Dependencies are inferred from the claim text.