Carbon steel wire and method for manufacturing same

Abstract

Provided is a carbon steel wire excellent in shear resistance as compared with a conventional one and a method of manufacturing such a carbon steel wire. Provided is a carbon steel wire 1 having a wire diameter of from 0.1 to 0.6 mm, and when the radius of a circular cross-section orthogonal to the longitudinal direction is r and a region from the outer periphery of the circular cross-section toward the center to 0.4r is a surface layer portion 2 , the occupancy ratio of a crystal texture in the [110] orientation with respect to the longitudinal direction in the surface layer portion 2 is 60% or less.

1 . A carbon steel wire having a wire diameter of from 0.1 to 0.6 mm, characterized in that,
 when the radius of a circular cross-section orthogonal to the longitudinal direction is r and a region from the outer periphery of the circular cross-section toward the center to 0.4r is a surface layer portion, the occupancy ratio of a crystal texture in the [110] orientation with respect to the longitudinal direction in the surface layer portion is 60% or less.   
     
     
         2 . The carbon steel wire according to  claim 1 , wherein, when a region inside the surface layer portion in the circular cross-section is a central portion, the occupancy ratio of a crystal texture in the [110] orientation with respect to the longitudinal direction in the central portion is greater than 60%. 
     
     
         3 . The carbon steel wire according to  claim 1  which is for reinforcing rubber articles. 
     
     
         4 . The carbon steel wire according to  claim 2  which is for reinforcing rubber articles. 
     
     
         5 . A method of manufacturing a carbon steel wire comprising a step of subjecting a carbon steel wire rod to wet wire drawing processing by using a plurality of dies, characterized in that
 when the tensile strength of an eventually obtained carbon steel wire is T (MPa) and the number of dies used in the wet processing is n, a relationship represented by the following formula (1):
     T/n≦ 155 (MPa)  (1)
 
   
       is satisfied, and when the radius of the carbon steel wire rod before the wet wire drawing processing is d0 and the wire diameter of the carbon steel wire after the wet wire drawing is d1, the maximum value of a die drag at a die with a wire drawing distortion a represented by the following formula (2):
   ε=2×ln( d 0/ d 1)  (2)
 
 
       of 1.5 or less is 750 MPa or less.