Pearlitic rail steel with high strength and toughness and method of production of the same

摘要

Summary of pearlitic steel rail with high strength and toughness, and production method of the present invention refers to the segment of production of steel, in particular reveals a trail of pearlitic steel with high strength and toughness and a production method of the same.The production method comprises: controlling the following processing conditions in a procedure of lamination to produce the pearlitic rail steel with high strength and toughness: initial rolling temperature of 1120 1.180 OC, final rolling temperature of 840 to 880 OC, the reduction of the profile of the trail in the last two passes of rolling mill of 6% to 12%; the rail steel is cooled at 600 oC or less at a rate of cooling? 2.0 OC / s after the final rolling, and then cooled by air at ambient temperature; the chemical composition of the steel rail meets the following requirements: C: 0.75% to 0.84%, Si: 0.30% to 0.80%, Mn: 0.50% to 1.50%, V: 0.04% to 0.12%, it: 0004% to 0.02% and 0.10%? V + 10Ti? 0,25% [n]? 30 ppm, P? 0.020% s? 0.008%, with the remainder consisting of Fe content and impurities inevitable.The rail steel obtained by the method of the present invention has perlu00edticos significantly refined grain, tensile strength. 1.000MPa, and specific elongation? 14%, and has general properties of strength and toughness, high.