C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/52
C21D 9/04 (2006.01) C21D 1/19 (2006.01)
Patent
CA 1303468
METHOD FOR HEAT-TREATING STEEL RAIL HEAD ABSTRACT OF THE DISCLOSURE A method for heat-treating a steel rail head, which comprises: heating a steel rail head to the austenization temperature; then, cooling the rail head by means of a hot water jet until a surface temperature of the rail head decreases to a temperature not below 420°C; and then, cooling the rail head by means of an air jet at least to the pearlite transformation tempera- ture, thereby transforming the structure of a surface portion of the rail head into a uniform and fine pearlite structure. The above-described method includes a method in which the rail head is previously cooled by means of a water spray until the surface temperature of the rail head decreases to a temperature not below 530°C prior to the cooling of the rail head by means of the above- mentioned hot water jet.
567884
Fujibayashi Akio
Fukuda Kozo
Gino Takao
Kataoka Yuzuru
Morioka Kiyotaka
Macrae & Co.
Nippon Kokan Kabushiki Kaisha
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