Abstract: Provided is a wire rod contains, in mass %: C: 0.6 to 1.1%; Si: 0.1 to 0.5%; Mn: 0.2 to 0.6%; S: 0.004 to 0.015%; and, Cr: 0.02 to less than 0.05%; with a balance including Fe and inevitable impurities in which P is limited to 0.02% by mass or lower and Al is limited to 0.003% by mass or lower; the wire rod has a pearlite in a surface thereof; and, the wire rod has, in a peripheral portion in a cross section thereof, a {110} crystal plane of ferrite in the pearlite, an accumulation degree of the crystal plane being 1.2 or more.

Abstract: High strength steel wire for spring containing, by mass %, C: 0.67% to less than 0.75%, Si: 2.0 to 2.5%, Mn: 0.5 to 1.2%, Cr: 0.8 to 1.3%, V: 0.03 to 0.20%, Mo: 0.05 to 0.25%, W: 0.05 to 0.30%, and N: 0.003 to 0.007%, having a total of contents of Mn and V of 0.70%?Mn+V?1.27% and a total of contents of Mo and W of 0.13%?Mo+W?0.35%, limiting P: 0.025% or less, S: 0.025% or less, and Al: 0.003% or less, and having a balance of iron and unavoidable impurities, having a microstructure comprised of, by volume percent, over 6% to 15% of retained austenite and tempered martensite, having a prior-austenite grain size number of 10 or more, having a density of presence of spheroidal carbides with a circle equivalent diameter of 0.2 to 0.5 ?m of 0.06 particles/?m2 or less, having a density of presence of spheroidal carbides with a circle equivalent diameter of over 0.5 ?m of 0.01 particles/?m2 or less, and having a tensile strength of 2100 to 2350 MPa.

Abstract: High strength steel wire for spring containing, by mass %, C: 0.67% to less than 0.75%, Si: 2.0 to 2.5%, Mn: 0.5 to 1.2%, Cr: 0.8 to 1.3%, V: 0.03 to 0.20%, Mo: 0.05 to 0.25%, W: 0.05 to 0.30%, and N: 0.003 to 0.007%, having a total of contents of Mn and V of 0.70%?Mn+V?1.27% and a total of contents of Mo and W of 0.13%?Mo+W?0.35%, limiting P: 0.025% or less, S: 0.025% or less, and Al: 0.003% or less, and having a balance of iron and unavoidable impurities, having a microstructure comprised of, by volume percent, over 6% to 15% of retained austenite and tempered martensite, having a prior-austenite grain size number of 10 or more, having a density of presence of spheroidal carbides with a circle equivalent diameter of 0.2 to 0.5 ?m of 0.06 particles/?m2 or less, having a density of presence of spheroidal carbides with a circle equivalent diameter of over 0.5 ?m of 0.01 particles/?m2 or less, and having a tensile strength of 2100 to 2350 MPa.

Abstract: A high-carbon steel wire rod of high ductility for steel cord and the like is provided that experiences little breakage during drawing. The high-carbon steel wire rod of high ductility is a high-carbon steel wire rod fabricated by hot rolling that that has a carbon content of 0.7 mass % or greater, wherein 95% or greater of the wire rod metallographic structure is pearlite structure and the maximum pearlite block size of pearlite at the core of the hot-rolled wire rod is 65 ?m or less. The high-carbon steel wire rod of high ductility has a tensile strength in a range of {248+980×(C mass %)}±40 MPa} and a reduction of area of {72.8?40×(C mass %) %} or greater. The high-carbon steel wire rod of high ductility is characterized in that the average pearlite block size at the core of the hot-rolled wire rod constituted by ferrite grain boundaries of an orientation difference of 9 degrees or greater as measured with an EBSP analyzer is 10 ?m or greater and 30 ?m or less.

Abstract: Provided is a wire rod contains, in mass %: C: 0.6 to 1.1%; Si: 0.1 to 0.5%; Mn: 0.2 to 0.6% ; S: 0.004 to 0.015%; and, Cr: 0.02 to less than 0.05%; with a balance including Fe and inevitable impurities in which P is limited to 0.02% by mass or lower and Al is limited to 0.003% by mass or lower; the wire rod has a pearlite in a surface thereof; and, the wire rod has, in a peripheral portion in a cross section thereof, a {110} crystal plane of ferrite in the pearlite, an accumulation degree of the crystal plane being 1.2 or more.

Abstract: A high-carbon steel wire rod of high ductility for steel cord and the like is provided that experiences little breakage during drawing. The high-carbon steel wire rod of high ductility is a high-carbon steel wire rod fabricated by hot rolling that that has a carbon content of 0.7 mass % or greater, wherein 95% or greater of the wire rod metallographic structure is pearlite structure and the maximum pearlite block size of pearlite at the core of the hot-rolled wire rod is 65 ?m or less. The high-carbon steel wire rod of high ductility has a tensile strength in a range of {248+980×(C mass %)}±40 MPa} and a reduction of area of {72.8?40×(C mass %) %} or greater. The high-carbon steel wire rod of high ductility is characterized in that the average pearlite block size at the core of the hot-rolled wire rod constituted by ferrite grain boundaries of an orientation difference of 9 degrees or greater as measured with an EBSP analyzer is 10 ?m or greater and 30 ?m or less.

Abstract: Deformed wire for a submarine optical fiber cable used for the pressure-proof layer of the submarine optical cable and having a high strength, that is, having a tensile strength of 1800 MPa or more, is provided, which deformed wire for reinforcing submarine optical fiber cable is characterized by including, by wt %, C: more than 0.65% to 1.1%, Ceq=C+1/4Si+1/5Mn+4/13Cr satisfying 0.80%?Ceq?1.80%, having a number of shear bands cutting across an L-section center axial line of 20/mm per unit length of the center axis, having an angle formed by the center axis and shear bands in the range of 10 to 90°, having a tensile strength of 1800 MPa or more, having a sectional area forming an approximately fan shape, a plurality of the approximately fan shapes being combined to form a circular hollow cross-section for accommodating optical fibers, having at its surface a pebbled surface comprised of relief shapes of depths of 0.2 to 5 ?m, and having a weld at least at one location in the longitudinal direction.

Abstract: Deformed wire for a submarine optical fiber cable used for the pressure-proof layer of the submarine optical cable and having a high strength, that is, having a tensile strength of 1800 MPa or more, is provided, which deformed wire for reinforcing submarine optical fiber cable is characterized by including, by wt %, C: more than 0.65% to 1.1%, Ceq=C+1/4Si+1/5Mn+4/13Cr satisfying 0.80%?Ceq?1.80%, having a number of shear bands cutting across an L-section center axial line of 20/mm per unit length of the center axis, having an angle formed by the center axis and shear bands in the range of 10 to 90°, having a tensile strength of 1800 MPa or more, having a sectional area forming an approximately fan shape, a plurality of the approximately fan shapes being combined to form a circular hollow cross-section for accommodating optical fibers, having at its surface a pebbled surface comprised of relief shapes of depths of 0.2 to 5 ?m, and having a weld at least at one location in the longitudinal direction.