Metal treatment – Compositions – Heat treating
Patent
1985-05-08
1987-05-26
Rutledge, L. Dewayne
Metal treatment
Compositions
Heat treating
148 124, 148146, 148156, C21D 904
Patent
active
046683089
ABSTRACT:
At the exit from the hot rolling mill the rail temperature is reduced to a value not less than that at which the pearlite transformation begins in the rail head. From this temperature the continuously advancing rail is subjected to rapid cooling in a rapid cooling line. Subsequently the rail is cooled to ambient temperature. For a given rail head temperature at the extreme to the rapid cooling line, the length of the line, the speed of advance of the rail, and the average thermal flux density applied to the head, flange, and web of the rail are controlled so that the final mechanical properties of the rail head are obtained, although less then 60% of the cross-section of the head has undergone the austenite-pearlite transformation upon leaving the rapid cooling line, and differences in elongation between the head and the web and between the head and the flange are minimized.
REFERENCES:
patent: 4486243 (1984-12-01), Lambert et al.
Physical Metallurgy Principles Reed-Hill pp. 687-690 12/73.
Conti Ren/e/
Economopoulos Marios
Lambert Nicole
Simon Pierre
Centre de Recherches Metallurgiques--Centrum voor Research in de
Kastler S.
Metallurgique et Miniere de Rodange-Athus S.A.
Rutledge L. Dewayne
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