| 摘要 |
PROBLEM TO BE SOLVED: To produce a high carbon chromium bearing steel wire rod having excellent wore drawability in the as-hot-rolled state without performing heat treatment. SOLUTION: This wire rod has a composition consisting of, by weight, 0.95-1.10% C, 0.15-0.70% Si, 0.20-1.15% Mn, 0.90-1.60% Cr, further 0.0005-0.0050% B, and the balance Fe with inevitable impurities, and moreover, the area ratio and size of pro-eutectoic cementite in a pearlitic structure are regulated to <=3% and <=3μm, respectively. By selecting the components of the steel material most suitably, the amount of pro-eutectoid cemetite harmful to the wire drawability of the high carbon chromium bearing steel mire rod is reduced and the wire drawability of the high carbon chromium bearing steel wire rod is improved. Because of the high wire drawability of this wire rod, the necessity of the conventional annealing treatment for wire rod can be obviated.
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