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总结和探讨热处理钢轨的化学成分、工艺、性能,以及焊接、铺设等方面存在的问题。分析认为,用于热处理的钢轨应采用中上限的含碳量,较低的锰含量,以及添加少量推迟珠光体转变的元素以提高热处理工艺性能。采用喷风冷却淬火,以提高热处理钢轨性能的稳定性。在大力推广使用性价比高、综合性能好的在线热处理钢轨的同时,应注意进一步提高其硬度。热处理钢轨应进行焊后热处理,以提高无缝线路焊接接头部位的平顺性乃至使用寿命。在重型及以上铁路,半径小于800m或1200m的曲线上应铺设使用全长热处理钢轨。在不具备对钢轨进行打磨的情况下,暂不宜在非重载铁路的直线上成段铺设使用高硬度的热处理钢轨。
Summarized and discussed the heat treatment of the chemical composition of the rail, process, performance, and welding, laying and other aspects of the problems. The analysis shows that the rail used for heat treatment should adopt medium-upper limit carbon content, lower manganese content, and add a small amount of elements to delay pearlite transformation to improve the heat treatment process performance. Cooling using jet cooling to improve the stability of heat treatment of rail performance. In promoting the use of cost-effective, good overall performance of online heat treatment at the same time, should pay attention to further improve its hardness. Heat treatment of the rail should be post-weld heat treatment to improve seamless track welded joints and even the smooth life and service life. On heavy-duty and above railroads, full-length heat-treated rails shall be laid on the curves of radius less than 800m or 1200m. In the absence of grinding of the railroad, it is not appropriate to lay the rail on the straight line of heavy haul railroad using heat treatment with high hardness.