Abstract：Research purposes： Now 75 kg/m rails are applied on heavy haul railway lines in domestic，but AREMA 136RE (68 kg/m) rails are applied widely and maturely on heavy haul railway lines in countries which have developed heavy haul railway network. It is necessary to investigate properties of 68 kg/m(136RE) rails in order to provide more type of rails for heavy haul railway in domestic.
Research conclusions: The ultimate tensile strength at room temperature of hot-rolled rails is 1 080 MPa, and hardness of tread is up to 300 HB. The H and O contents of finished rails are 0. 5 x 10-4% and 12. 3 x 10-4% respectively. The microstructure of tread and gauge comer is consist of pearlite and a little ferrite. The largest residual tensile stress in rails bottom is 200. 2MPa. The fracture toughness ( K1C) at -20℃is 32. 5 MPa?m1/2. When the stress intensity factor (?K) is 10 MPa?m1/2}and 13. 5 MPa?m1/2，the fatigue crack growth rate(da/dN ) is respectively 9. 55 m/Gc and 31.98 m/Gc. All results show that the 68kg/m hot-rolled rails satisfy requirements of”tentative technical specifications of 68kg/m rails"，and could be laid on heavy haul railway line.
陈朝阳,张银花,周清跃,刘丰收. 我国重载铁路用68 kg/m钢轨试验研究[J]. 铁道工程学报, 2008, 25(9): 30-34.
CHEN Zhao-yang, ZHANG Yin-hua, ZHOU Qing-yue, LIU Feng-shou. Experimental Research on the 68 kg/m Rails for Heavy Haul Railway. 铁道工程学报, 2008, 25(9): 30-34.
2008, Vol. 25 
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