HIGH-CARBON HOT-ROLLING STEEL SHEET AND A PRODUCTION METHOD THEREFOR

摘要

The present invention provides a high-carbon hot-rolling steel sheet having a fine pearlite structure which i) on a percent by weight basis comprises carbon in an amount of 0.60-1.20%, silicon in an amount of 0.10-0.35%, manganese in an amount of 0.10-0.80%, phosphorous in an amount of more than 0 and less than 0.03% and sulphur in an amount of more than 0 and less than 0.03%, and also comprises at least one of nickel in an amount of less than 0.25% (including 0), chromium in an amount of less than 0.30% (including 0) and/or copper in an amount of less than 0.25% (including 0), and a balance of iron and other inevitably added impurities, and in which ii) the cementite width is greater than 0 and less than 0.2mm, and the cementite-cementite spacing is greater than 0 and less than 0.5mm.