METHOD FOR MANUFACTURING A T-SHAPED RAIL HAVING A HIGH-STRENGTH BASE Russian patent published in 2022 - IPC C21D9/04 C21D1/667 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to a T-shaped rail having a high-strength base, and a method for obtaining it. The method for manufacturing a high-strength T-shaped rail with a hardened sole includes the following stages, after which a T-shaped rail made of carbon steel is obtained at a temperature from 700 to 800°C; the said steel rail is cooled at a cooling rate, which, if displayed on a graph in XY coordinates with the X axis representing the cooling time in seconds and the Y axis representing the surface temperature of the base of the said steel T-shaped rail in °C, is maintained in the area between: the graph of the upper limit of the cooling rate determined by the upper line connecting the XY coordinates (0 s, 800°C), (80 s, 675°C), (110 s, 650°C) and (140 s, 663°C), and a graph of the lower boundary of the cooling rate determined by the lower line connecting the XY coordinates (0 s, 700°C), (80 s, 575°C), (110 s, 550°C) and (140 s, 535°C). At the same time, the cooling rate for a period of time from 0 to 80 seconds, displayed on the graph, has an average value within the range from 1.25 to 2.5°C/s, the cooling rate for a period of time from 80 to 110 seconds, displayed on the graph, has an average value within the range from 1 to 1.5°C/s, and the cooling rate for a period of time from 110 to 140 seconds, displayed on the graph, has an average value within the range from 0.1 to 0.5°C/s. T-shaped rails with bases are characterized by high strength/hardness.

EFFECT: expansion of the range of methods for manufacturing T-shaped rails.

18 cl, 4 dwg, 1 tbl