| 摘要 |
<p>Thermal treatment of a steel rail (1) of the type made up of a head (2), a centre rib (3) and a base (4) involves using the following steps: (a) the successive or simultaneous preheating of each transverse section of rail (1) above the end temperature for metallurgical transformation in a manner such that simultaneously or successively each transverse section of rail (1) has a homogeneous austenitic structure; (b) the successive or simultaneous over-heating of the head (2) of each transverse section of rail (1) in a manner such that the average temperature of the head (2) of each transverse section of the rail (1) will be at least 40 degrees C greater than the average temperature of the base (4) of the same transverse section of the rail (1); (c) the successive or simultaneous cooling of each transverse section of the rail (1) to below the end transformation temperature by cooling in a manner that produces a fine perlitic structure in the whole of the transverse section of the rail (1); and (d) the simultaneous or successive cooling of each transverse section of rail (1) to ambient temperature.</p> |
