Method of and apparatus for heat treating rails

专利名称：Method of and apparatus for heat treating

rails

发明人：Fukuda, Keiji c/o Daisan Gijutsu

Kenkyusho,Suzuki, Takefumi c/o DaisanGijutsu Kenkyusho,Kageyama, Hideaki c/oYahata Factory,Makino, Yoshiaki c/o YahataFactory,Hisatsune, Masanori c/o YahataFactory,Matsubara, Eigo c/o Yahata

Factory,Ishii, Mitiaki c/o Yahata Factory,Sato,Manabu c/o Yahata Factory,Koyama, Haruoc/o Yahata Factory

申请号：EP85308972申请日：19851210公开号：EP0186373A3公开日：19870520

专利附图：

摘要： A method of heat-treating a rail for obtaining a variety of strength levels frommedium 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 disposinga nozzle means around the head of the rail such that the nozzle means can direct agaseous cooling medium towards the head of the rail; determining the distance betweenthe nozzle means and the head of the rail in accordance with both the hardness level tobe attained in the head of the rail and the carbon equivalent of the steel constituting therail; moving the nozzle means such that the distance is attained between the nozzlemeans and the head of the rail; and directing the gaseous cooling medium towards thehead at a predetermined flow rate and for a predetermined time so as to cool the headof the rail thereby attaining the desired hardness level in the head of the rail.

申请人：NIPPON STEEL CORPORATION

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