C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
38/10, 148/51
C21D 1/18 (2006.01) C21D 1/62 (2006.01) C21D 9/52 (2006.01) C21D 9/573 (2006.01)
Patent
CA 1259014
ABSTRACT OF THE DISCLOSURE 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 - 630°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.
490148
Asakura Takashi
Nakamura Yukihiro
Ojima Kunio
Yamada Katsuhiko
Yamamori Yusuke
Riches Mckenzie & Herbert Llp
Sumitomo Electric Industries Ltd.
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