The stability of structure and properties of bainitic rail are comprehensively analyzed in this paper,with focus on the chemical components,mechanical property,metallographic structure,hydrogen and oxygen content,stretch and im-pact,hardness and physical fatigue of bainitic rail.This paper has studied heel forging and heat treatment etc.the key process of high strength low carbon bainitic switch rail,and test results of acceptance of Tongpu and Daqing heavy-haul lines prove that every performance index of bainitic switch rail head is better than pearlitic switch rail,the service life of some bainitic switch rail is triple of the original laid pearlitic switch rail.Practice has proved that bainitic switch rail is the development direction of turnout switch rail.%对贝氏体钢轨组织及性能的稳定性等进行了全面的分析，重点对贝氏体钢轨的化学成分、机械性能、金相组织、氢氧含量、拉伸及冲击、硬度和实物疲劳方面进行研究，对高强度低碳贝氏体钢尖轨的跟端锻造、热处理方法等关键的工艺过程进行了研究。通过对同蒲和大秦重载线上道的试验结果证明，贝氏体钢尖轨轨头各项性能指标明显优于珠光体钢尖轨，贝氏体钢尖轨的使用寿命比原来铺设的珠光体钢尖轨提高3倍。由此可见，贝氏体尖轨是道岔尖轨的发展方向。
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