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Hou C.,Zhuzhou Minrui Locomotive Parts Co. | Chen L.,Zhuzhou Minrui Locomotive Parts Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

Hardhead rail specified in Europe standard BS EN13674-2:2006 must have a hardened layer with depth over 20 mm, surface hardness of 350-390 HBW and good match of strength and toughness. Test results show that the existing railhead profile modeling heating inductor is not suitable for heat treating hard railhead and it repeatedly occurs the problem that the hardened layer depth, hardness and strength and toughness are not properly matched. The analysis shows that due to the sharp temperature gradient on railhead section, the temperature on rounded angle of railhead reaches or even over the coarsening temperature of austenitic grain size. The structure of railhead heating inductor was improved, a uniform temperature field on railhead is obtained, and the hardened layer depth, hardness and strength and toughness are matched preferably. Source


Hou C.,Zhuzhou Minrui Locomotive Parts Co. | Chen L.,Zhuzhou Minrui Locomotive Parts Co. | Hu M.,Zhuzhou Minrui Locomotive Parts Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

The traditional manufacturing procedure to make switch rail of 60D40 special cross section rail includes two processes, first is to machine the variable-section of railhead, and then to induction hardening. Production practice shows that the straightness of gauge side of the switch rail still attain with difficulty the acceptance requirements of the Tentative Specification for Manufacturing of Turnouts for Passenger Dedicated Lines, and in the meantime the production efficient is low. In order to reform the existing turnout switch rail manufacturing technology, i.e. to arrange the machining process after heat treatment, experimental study and nearly one hundred times of trials were implemented to determine the off-line heat treatment process for R350 hard head rail of 60D40 rail. Experimental results show that the surface hardness, cross hardness profile, tensile strength and microstructure all meet the technical requirements of the hard head rail of R350HT of the European standards BS EN 13674-2: 2006. This technology lays the foundation for upgrading and being in line with international standards of China's turnouts manufacture technology. Source

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