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中碳钢用Cr、Mn、Si合金化可以提高钢轨性能,特别是热处理状态钢轨的强度和耐磨性,但是,由于降低了塑性、从而接触疲劳型的缺陷增多了。例如40CrMnSiNiMoV钢的强度达到150～160kgf/mm~2时,疲劳极限值大大地降低。布理坦斯基钢铁联盟研究学者对钢强度达到130～150Kgf/mm~2以上塑性降低的原因,是用钢中存在粗大的非金属夹杂物来解释的。 因此,开始重视改善钢轨的综合性能。
Medium carbon steels can be alloyed with Cr, Mn and Si to improve the performance of the rail, especially the strength and wear resistance of the rail in the heat-treated state. However, due to the reduction of the plasticity, there is an increase in contact fatigue type defects. For example, 40CrMnSiNiMoV steel strength reached 150 ~ 160kgf / mm ~ 2, fatigue limit value greatly reduced. The reasons why the ductility of the steel reaches 130-150 Kgf / mm ~ 2 for steel is the reason why the researchers at the Burtenstein Institute of Steel Research have explained the existence of coarse non-metallic inclusions in the steel. Therefore, begin to attach importance to improving the comprehensive performance of the rail.