C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/36.2
C21D 1/74 (2006.01) C21D 9/567 (2006.01) C21D 9/573 (2006.01)
Patent
CA 1074216
ABSTRACT OF THE DISCLOSURE A heat treating process for a rod by the use of a fluidized bed consisting of alumina, silicon sand, zircon sand and the like for adjusting the strength of the rod due to its cooling in the fluidized bed. The prior art heat treatment of this type adopts an attempt to vary the temperature of the fluidized bed for varying a cooling rate of the rod, resulting in the need to use costly heat-resisting constructions for the fluidized bed and equip- ments associated therewith. In the heat treatment according to the present invention, a rod is introduced through an inlet open into a fluidized bed and then through the fluidized bed upwards slantwise to come out from the surface of the bed. The fluidized bed in this case has a given length and the rod is fed at a given speed. Thus, the varying soaking times of a rod in a fluidized bed are obtained by varying the distance from the inlet to the point where the rod emerges from the surface of the fluidized bed, thereby adjusting the resulting strength of the rod. This process has no need to vary the temperature of the fluidized bed and yet permits the adjustment of the strength of the rod over a wide range, according to a simple apparatus and operation, while retaining existing productivity.
243532
Ishigami Osamu
Oki Yasuhiro
Shimizu Masaru
Takahashi Eiji
Kobe Steel
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