Metal treatment – Compositions – Heat treating
Patent
1985-07-22
1987-11-03
Brody, Christopher W.
Metal treatment
Compositions
Heat treating
148156, C21D 952
Patent
active
047041668
ABSTRACT:
In the production of medium carbon steel wire rod, upon leaving the hot rolling mill, the rod is cooled in two phases. The first phase is operative as the rod moves at end-of-rolling speed along a cooling line disposed between the finishing block and feed rollers disposed at the entry of a head for placing the rod in overlapping turns on a conveyor, the cooling line being continuous--i.e. being devoid of air cooling breaks between consecutive intensive cooling sections, the length and capacity of the cooling line being such that the surface temperature of the rod at the end of the first phase is between, on the one hand, the start-of-martensitic-transformation temperature for the particular steel concerned and, on the other hand, the latter temperature plus 200.degree. C. The second cooling phase is operative upon the rod once it has been placed in overlapping non-concentric turns on the conveyor, the time which elapses between the end of the first phase and the start of the second phase being less than the time needed for the percentage of transformed austenite to exceed 5%. Austenite transformation is at least 95% at the departure from the second phase.
REFERENCES:
patent: 3645805 (1972-02-01), Hoffman et al.
patent: 3666572 (1972-05-01), Nakagawa et al.
patent: 3783043 (1974-01-01), Almond et al.
patent: 4395022 (1983-07-01), Paulus et al.
Bach Norbert
Economopoulos Marios
Gredt Marc
Lessel Guy
Schummer Arthur
Brody Christopher W.
Centre de Recherches Metallurgiques--Centrum voor Research in de
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