Method for reducing internal stresses of roller straightened rai

Details Method for reducing internal stresses of roller straightened rai Method for reducing internal stresses of roller straightened rai

1986-01-14

1987-04-21

Combs, E. Michael

Metal treatment

Compositions

Heat treating

72128, 72200, 148134, 420 8, C21D 100, C21D 600, B21B 108, B21D 302

Patent

active

046593985

ABSTRACT:
The present invention relates to a process for reducing internal stresses of roller straightened rails. After the straightening operation the rail web portion is heated for a short time to temperatures ranging between 200.degree.-700.degree. C., preferably between 350.degree.-500.degree. C., and after reaching the desired temperatures the rail is cooled by air to room temperature. For the purpose of heating the rail is continuously conveyed in front of the heating apparatus.
The inventive process permits to reduce internal stresses in the rail head and base portions to a value of less than 50 N/mm.sup.2 thus ensuring increased rupture strength of the rail.

REFERENCES:
patent: 1285749 (1918-11-01), Lewis et al.
patent: 1331175 (1920-02-01), Wills
patent: 1363601 (1920-12-01), Kenney
patent: 1914439 (1933-06-01), Langford
patent: 4082577 (1978-04-01), Heller
patent: 4486248 (1984-12-01), Ackert et al.
patent: 4575397 (1986-03-01), Heller

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