| 摘要 |
PROBLEM TO BE SOLVED: To obtain a wire rod for extra fine steel wire, reduced in tensile strength, excellent in wire drawability, and having high strength and high ductility by regulating the number of sulfides of specific size or below, existing in the cross section perpendicular to the length direction of a steel wire rod containing carbon by a specific percentage or above, to a specific value or above and also regulating tensile strength to a specific value or below. SOLUTION: This wire rod is a steel wire rod containing >=0.6 wt.% C, where the number of <=2μsulfides existing in the cross section perpendicular to the length direction of the wire rod and tensile strength are regulated to >=1×10<4> pieces/mm<2> and <=(200+980×Cmass%)MPa, respectively. Further, this wire rod has a chemical composition consisting of, by weight, 0.6-1.2% C, 0.1-0.6% Si, 0.1-1.5% Mn, <=0.020%; P, <=0.020% S, <=0.003% Al, and the balance iron and containing, if necessary, one or more kinds among 0.1-0.5% Cr, 0.1-1.0% Ni, and 0.1-0.8% Cu. This wire rod is suitable for use in reinforcement for rubber, such as tire and belt cord, and organic material.
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