| 摘要 |
PROBLEM TO BE SOLVED: To realize high strength extra fine steel wire with excellent strandability and fatigue characteristic. SOLUTION: This method to produce the high strength extra fine steel wire has a wire-drawn pearlite structure to include one or more of C, Si, Mn, and Al and, as required, Cr, Ni, and V. The concentration ratio of C/lamellar ferrite in a surface layer of the steel wire and a center thereof is not more than 2. The method is characterized in that a combination is made between the following (H) and two or more of (A), (B), (C), (D) and (E): (A) strength of a parenting material is made not less than 1300 MPa; (B) wire-drawing is carried out with a die having an approach angle of 8-12°and length of a bearing of 0.2-0.5 D (D: die diameter) (c) a diamond die is used; (D) heat generation caused by the wire-drawing is suppressed; (E) lubricant having high lubrication capability is used; (H) bending processing is carried out while tension is being imparted to the steel wire after the wire-drawing. COPYRIGHT: (C)2004,JPO
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