Process for manufacturing high strength railroad rails

Details Process for manufacturing high strength railroad rails Process for manufacturing high strength railroad rails

1989-01-30

1991-04-02

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148150, 148320, C21D 904

Patent

active

050045105

ABSTRACT:
Steel rails having reduced camber and improved wear resistance provided by enhanced rail head strength and hardness level decreasing uniformly from the rail head surface to a depth of 15 to 25 mm. are produced by a method and apparatus in which the rail is preheated below the A.sub.c3 temperature, heated above the A.sub.c3, cooled in air, cooled three dimensionally with compressed air directed on the top and at an angle of 1-10 degrees onto the sides of the rail head, and further cooled with liquid coolant.

REFERENCES:
patent: 4375995 (1983-03-01), Sugino et al.
patent: 4486248 (1984-12-01), Ackert et al.

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