| 摘要 |
<p>A direct patenting wire rod with a diameter of 4. 0 mm to 16 mm comprising a high carbon steel having a carbon content of 0. 7 % or more, wherein the layer in the range of at least 300 µm from the surface of the wire rod has an average carbon content of 0. 97 or less times that of the whole cross section of the wire rod, has a Vickers hardness of Hv 390 or less, and has an average separation between lamellas of 95 nm or more; and a method for producing the wire rod. The wire rod is a direct patenting high strength wire rod having a surface layer which is less prone to the occurrence of fretting martensite and thus is less susceptible to the occurrence of the cut due to a flaw formed by the handling during transportation or the like.</p> |
