| 摘要 |
PROBLEM TO BE SOLVED: To improve the wear resistance and ductility of a rail in such a manner that breaking does not occur by the change of atmospheric temp. and the temp. change when welding by preparing a rail contg. a specified compsn. of elements. SOLUTION: A pearlite type rail preferably contg., by weight, 0.75 to 0.84% C, 0.10 to 1% Si, 0.40 to 2.5% Mn, <=0.035% P, <=0.035% S and 0.05 to 0.5% V is prepd. In this way, a rail used in a severe environment such as a high axle load railload heavy in railload weight and having many sharp curve parts is obtd. Moreover, in the case one or >= two kinds of elements selected from 0.05 to 1.5% Cr, 0.1 to 1% Cu, 0.1 to 1% Ni and 0.1 to 2% Mo are incorporated in addition to the componential system, by solid solution strengthening, it can be hardened, and its wear resistance can moreover be improved. Furthermore, in the case 0.0005 to 0.15% Nb is incorporated, it is bonded with C in the steel after rolling to form fine carbides, so that its wear resistance can moreover be improved.
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