Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1988-05-20
1989-12-12
Roy, Upendra
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148144, C21D 904
Patent
active
048865583
ABSTRACT:
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.degree. C.; and then cooling the rail head by means of an air jet at least to the pearlite transformation temperature, 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.degree. C. prior to the cooling of the rail head by means of the above-mentioned hot water jet.
REFERENCES:
patent: 4201602 (1970-05-01), Shupe
patent: 4486243 (1984-12-01), Lambert et al.
patent: 4575397 (1986-03-01), Heller
patent: 4668308 (1987-05-01), Economopaulos et al.
Fujibayashi Akio
Fukuda Kozo
Gino Takao
Kataoka Yazuru
Morioka Kiyotaka
NKK Corporation
Roy Upendra
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