High-carbon steel wire material with excellent wire drawability, and steel wire

Abstract

To provide a high-carbon steel wire rod with excellent wire drawability. The high-carbon steel wire rod of the present invention includes predetermined components and also includes pearlite and proeutectoid cementite, and an area ratio of pearlite is 90% or more relative to the entire structure, a maximum length of proeutectoid cementite is 15 μm or less, and a concentration difference between an average of the Si concentration inside proeutectoid cementite and a maximum value of the Si concentration inside ferrite that forms a lamellar structure of pearlite is 0.50 to 3%.

1 : A steel wire rod comprising, in % by mass,
 C: 0.90 to 1.3%,   Si: 0.4 to 1.2%,   Mn: 0.2 to 1.5%,   P: more than 0% and 0.02% or less,   S: more than 0% and 0.02% or less,   Al: more than 0% and 0.008% or less,   Ti: 0 to 0.005%,   N: 0.001 to 0.008%,   iron and inevitable impurities, wherein   the structure includes pearlite and proeutectoid cementite,   an area ratio of pearlite is 90% or more relative to the entire structure,   a maximum length of proeutectoid cementite is 15 pin or less, and   a concentration difference between an average of the Si concentration inside proeutectoid cementite and a maximum value of the Si concentration inside ferrite that forms a lamellar structure of pearlite is 0.50 to 3%.   
     
     
         2 : The steel wire rod according to  claim 1 , further comprising, in % by mass, at least one selected from the group consisting of (a) to (d):
 (a) B: more than 0% and 0.01% or less,   (b) Co: more than 0% and 1.5% or less,   (c) at least one selected from the group consisting of V: more than 0% and 0.5% or less, and Cr: more than 0% and 0.5% or less, and   (d) at least one selected from the group consisting of Cu: more than 0% and 0.5% or less, Ni: more than 0% and 0.5% or less, and Nb: more than 0% and 0.5% or less.   
     
     
         3 : A steel wire obtained by wire drawing of the steel wire rod according to  claim 1 . 
     
     
         4 : A steel wire obtained by wire drawing of the steel wire rod according to  claim 2 . 
     
     
         5 : The steel wire rod according to  claim 2 , comprising (a). 
     
     
         6 : The steel wire rod according to  claim 2 , comprising (b). 
     
     
         7 : The steel wire rod according to  claim 2 , comprising (c). 
     
     
         8 : The steel wire rod according to  claim 2 , comprising (d).