公开(公告)号：EP0186373A3

公开(公告)日：1987-05-20

申请号：EP85308972

申请日：1985-12-10

申请人： NIPPON STEEL CORPORATION

发明人： Fukuda, Keiji c/o Daisan Gijutsu Kenkyusho ,  Suzuki, Takefumi c/o Daisan Gijutsu Kenkyusho ,  Kageyama, Hideaki c/o Yahata Factory ,  Makino, Yoshiaki c/o Yahata Factory ,  Hisatsune, Masanori c/o Yahata Factory ,  Matsubara, Eigo c/o Yahata Factory ,  Ishii, Mitiaki c/o Yahata Factory ,  Sato, Manabu c/o Yahata Factory ,  Koyama, Haruo c/o Yahata Factory

IPC分类号： C21D09/04 ,  C21D11/00

CPC分类号： C21D9/04 ,  C21D11/005

摘要： 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 towards 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.