Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1989-02-09
1990-04-03
Kastler, S.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148143, 148145, C21D 904
Patent
active
049137476
ABSTRACT:
A method of heat-treating a rail for obtaining a variety of strength levels from medium value to high value. The method has the steps of: preparing a steel rail maintained at a high temperature region not lower than the austenite field, and disposing a nozzle means around the head of the rail such that the nozzle means can direct a gaseous cooling medium toward the head of the rail; determining the distance between the nozzle means and the head of the rail in accordance with both the hardness level to be attained in the head of the rail and the carbon equivalent of the steel constituting the rail; moving the nozzle means such that the distance is attained between the nozzle means and the head of the rail; and directing the gaseous cooling medium towards the head at a predetermined flow rate and for a predetermined time so as to cool the head of the rail thereby attaining the desired hardness level in the head of the rail.
REFERENCES:
patent: 1516407 (1924-11-01), Sandberg
patent: 4486248 (1984-12-01), Ackert et al.
Fukuda Keiji
Hisatsune Masanori
Ishii Mitiaki
Kageyama Hideaki
Koyama Haruo
Kastler S.
Nippon Steel Corporation
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