Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1987-05-13
1988-09-13
Brody, Christopher W.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
72286, C21D 1100
Patent
active
047707224
ABSTRACT:
A method and apparatus for the direct heat treatment of a medium- to high-carbon steel rod in which the formation of martensite is prevented, even if the starting billet contains segregation. A hot-rolled rod is transported on a conveyor in the form of a sequence of non-concentric rings. The rod is then subjected to controlled cooling in a coolant so that the greater part of any austenite in the entire length of the rod is substantially uniformly transformed to a fine pearlite structure. The sequence of non-concentric rings of the rod is next held at a temperature of 450.degree.-630.degree. C. for a period of 60-300 seconds, with the pitch between each ring being made smaller than at the inlet of the conveyor. Accordingly, a pearlite transformation is effected of any residual austenite.
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Asakura Takashi
Nakamura Yukihiro
Ojima Kunio
Yamada Katsuhiko
Yamamori Yusuke
Brody Christopher W.
Sumimoto Electric Inductries, Ltd.
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