JFE开发的高抗磨和抗滚动接触疲劳的重载铁路用SP3钢轨

IFE制钢公司开发了高性能珠光体钢轨（sv3），这种钢轨应用在重载铁路上具有良好的耐磨性和抗滚动接触疲劳性（RCF）特点。为了能够获得良好的抗磨和滚动接触抗疲劳性（RCF），SP3钢轨需要采用适当的合金设计以及最佳的生产条件，包括热机械控轧工艺（TMCP）。在钢轨表面，SP3的层间隙极其细小，可达0．07μm，表面布氏硬度≥420（HB420）。另外，SP3钢轨从轨头表面算起至25．4毫米的硬度超过HB370。SP3钢轨良好的耐磨性和抗滚动接触疲劳性的特点已经在北美重载铁路的实际性能测试中得到了验证。在实验中，SP3与传统的HB390热处理钢轨相比，耐磨性要高出10％，轨头上没有任何诸如脱皮和掉皮等疲劳损伤的痕迹。

Development of SP3 Rail with High Wear Resistance and Rolling Contact Fatigue Resistance for Heavy Haul Railways

JFE Steel has developed high performance pearlitic steel rail （SP3） with ＇excellent wear resistance and roll- ing contact fatigue （RCF） resistance for heavy haul railways. To obtain excellent wear and RCF resistances, SP3 rail was manufactured by the suitable alloy design and optimum production conditions including the thermo-mechanical controlled process （TMCP）. The lamellar spacing of SP3 was extremely line of 0.07μ m near the rail surface, with the surface hardness of 420 in Brinel scale （HB420） or higher. In addition, SP3 showed high hardness over HB370 even at 1-inch depth （25.4 ramdepth） from the rail head surface. The excellent wear and RCF resistances of SP3 have been demonstrated by the actual performance tests at heavy haul railway in North America. At approximate 100 mgt from the installation, SP3 showed 10% better wear resistance comparing with the conventional HB390 grade heat treatment rail at the test, without showing any fatigue damage on the rail head surface, such as flaking and shelling.