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首页> 外国专利> Process for manufacturing high-strength bainitic steel rails with excellent rolling-contact fatique resistance

Process for manufacturing high-strength bainitic steel rails with excellent rolling-contact fatique resistance

机译：具有优异的耐滚动接触疲劳性能的高强度贝氏体钢轨的制造方法

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摘要

A process for manufacturing high-strength bainitic steel rails with an excellent rolling-contact fatigue resistance comprising the steps of hot rolling steel containing 0.15 % to 0.45 % carbon, 0.15 % to 2.00 % silicon, 0.30 % to 2.00 % manganese, 0.50 % to 3.00 % chromium, and at least one element selected from a group of molybdenum, nickel, copper, niobium, vanadium, titanium and boron, subjecting the hot-rolled rail to an accelerated cooling from the austenite region to a temperature between 500° to 300° C, at which the accelerated cooling is stopped, at a rate of 1° to 10° C per second, and then further cooling the rail to a lower temperature by natural or controlled cooling. The obtained rail exhibits a hardness of Hv 300 to 400 in the center of the rail head surface of the head and not lower than Hv 350 in the gage corner, and the hardness of the gage corner is higher than that of the center of the rail head surface by Hv 30 or more.
机译：一种具有优异的耐滚动接触疲劳性的高强度贝氏体钢轨的制造方法，包括以下步骤：热轧钢，碳含量为0.15％至0.45％，硅含量为0.15％至2.00％，锰含量为0.30％至2.00％，锰含量为0.50％至0.5％ 3.00％的铬和至少一种选自钼，镍，铜，铌，钒，钛和硼的元素，使热轧钢轨从奥氏体区域加速冷却到500°至300之间的温度以每秒1°C到10°C的速度停止加速冷却的温度，然后通过自然冷却或控制冷却将钢轨进一步冷却到较低的温度。所获得的钢轨在头部的钢轨头部表面的中央具有Hv 300至400的硬度，并且不低于轨距角的Hv 350，并且轨距角的硬度高于轨线中心的硬度。头部表面Hv 30以上。

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