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Pearlite steel rail of high internal hardness type excellent in wear resistance and fatigue failure resistance and process for production of the same
Pearlite steel rail of high internal hardness type excellent in wear resistance and fatigue failure resistance and process for production of the same
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机译:具有优异的耐磨性和抗疲劳破坏性的高内部硬度型珠光体钢轨及其制造方法
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摘要
The invention provides a pearlite steel rail of high internal hardness type which is excellent in both wear resistance and fatigue failure resistance and a process suitable for the production of the rail. Specifically, a pearlite steel rail which has a composition containing by mass C: 0.73 to 0.85%, Si: 0.5 to 0.75%, Mn: 0.3 to 1.0%, P: 0.035% or below, S: 0.0005 to 0.012% and Cr: 0.2 to 1.3% with the balance consisting of Fe and unavoidable impurities and having a [%Mn]/[%Cr] ratio of 0.3 or above and below 1.0 (wherein [%Mn] is Mn content and [%Cr] is Cr content) and whose railhead exhibitsan internal hardness of Hv380 or above and below Hv480 in terms of Vickers hardness (Hv)in a depth range of at least 25mm from the railhead surface.
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