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INTERNAL HIGH HARDNESS TYPE PEARLITIC RAIL WITH EXCELLENT WEAR RESISTANCE AND ROLLING CONTACT FATIGUE RESISTANCE AND METHOD FOR PRODUCING SAME
INTERNAL HIGH HARDNESS TYPE PEARLITIC RAIL WITH EXCELLENT WEAR RESISTANCE AND ROLLING CONTACT FATIGUE RESISTANCE AND METHOD FOR PRODUCING SAME
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机译：具有优异的耐磨性和滚动接触疲劳性的内部高硬度型珍珠岩及其制造方法
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摘要
An internal high hardness type pearlitic rail withexcellent wear resistance and rolling contact fatigueresistance and a preferred method for producing the same areprovided. Specifically, the internal high hardness typepearlitic rail has a composition containing 0.73% to 0.85%by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn,0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2%to 1.3% by mass Cr, and the balance being Fe and incidentalimpurities, in which the value of [%Mn]/[%Cr] is greaterthan or equal to 0.3 and less than 1.0, where [%Mn]represents the Mn content, and [%Cr] represents the Crcontent, and in which the internal hardness of a rail headthat is defined by the Vickers hardness of a portion locatedfrom a surface layer of the rail head to a depth of at least25 mm is greater than or equal to 380Hv and less than 480Hv.
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