Steel wire and coated steel wire

Abstract

A steel wire includes, as a chemical composition, by mass %, C: 0.40% to 1.10%, Si: 0.005% to 0.350%, Mn: 0.05% to 0.90%, Cr: 0% to 0.70%, Al: 0% to 0.070%, Ti: 0% to 0.050%, V: 0% to 0.10%, Nb: 0% to 0.050%, Mo: 0% to 0.20%, B: 0% to 0.0030%, and a remainder including Fe and impurities; in which a metallographic structure in a cross section includes 80 area % or more of a pearlite structure having a lamellar cementite; an average lamellar spacing which is a spacing between lamellar cementites is 28 nm to 80 nm; an average length of the lamellar cementite is 22.0 μm or less; among the pearlite structure, a pearlite structure having the lamellar cementite of which an inclination with respect to a longitudinal direction of the steel wire is 15° or less is 40 area % or more; an integration degree of a {110} plane of a ferrite with respect to the longitudinal direction is in a range of 2.0 to 8.0, and a diameter of the steel wire is 1.4 mm or more.

1 . A steel wire comprising, as a chemical composition, by mass %:
 C: 0.40% to 1.10%;   Si: 0.005% to 0.350%;   Mn: 0.05% to 0.90%;   Cr: 0% to 0.70%;   Al: 0% to 0.070%;   Ti: 0% to 0.050%;   V: 0% to 0.10%;   Nb: 0% to 0.050%;   Mo: 0% to 0.20%;   B: 0% to 0.0030%; and   a remainder including Fe and impurities,   wherein a metallographic structure in a cross section includes 80 area % or more of a pearlite structure having a lamellar cementite,   an average lamellar spacing which is a spacing between the lamellar cementites is 28 nm to 80 nm,   an average length of the lamellar cementite is 22.0 μm or less,   among the pearlite structure, a pearlite structure having the lamellar cementite of which an inclination with respect to a longitudinal direction of the steel wire is 15° or less is 40 area % or more,   an integration degree of a {110} plane of a ferrite with respect to the longitudinal direction, which is obtained using an X-ray diffraction method, is in a range of 2.0 to 8.0, and   a diameter of the steel wire is 1.4 mm or more.   
     
     
         2 . The steel wire according to  claim 1  comprising, as the chemical composition, by mass %, one or more selected from the group consisting of:
 Cr: 0.01% to 0.70%; 
 Al: 0.001% to 0.070%; 
 Ti: 0.002% to 0.050%; 
 V: 0.002% to 0.10%; 
 Nb: 0.002% to 0.050%; 
 Mo: 0.02% to 0.20%; and 
 B: 0.0003% to 0.0030%. 
 
     
     
         3 . A coated steel wire comprising:
 a steel wire according to  claim 1 ; and   a metal coating layer which coats the steel wire.   
     
     
         4 . The coated steel wire according to  claim 3 ,
 wherein the metal coating layer includes at least one of the group consisting of zinc, zinc alloy, aluminum, aluminum alloy, copper, copper alloy, nickel, and nickel alloy.   
     
     
         5 . A coated steel wire comprising:
 a steel wire according to  claim 2 ; and   a metal coating layer which coats the steel wire.   
     
     
         6 . The coated steel wire according to  claim 5 ,
 wherein the metal coating layer includes at least one of the group consisting of zinc, zinc alloy, aluminum, aluminum alloy, copper, copper alloy, nickel, and nickel alloy.