C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 8/22 (2006.01) C21D 9/52 (2006.01) C21D 9/56 (2006.01) C21D 9/67 (2006.01) C23C 8/02 (2006.01) C23C 8/26 (2006.01)
Patent
CA 2048149
ABSTRACT OF THE DISCLOSURE A continuous annealing line for annealing a cold-rolled strip of a ultra-low-carbon steel comprising a heating furnace for heating the strip which is fed continuously, with or without a soaking furnace following the heating furnace, a cooling furnace in which the heated steel strip is cooled, and a carburizing/nitriding furnace disposed between the heating furnace or the soaking furnace and the cooling furnace. The carburizing/nitriding furnace may be divided into a plurality of zones, each of which is provided with control means for controlling the carburizing/nitriding atmosphere and carburizing/nitriding temperature in the zone. The continuous annealing line may further comprise a plurality of carburizing/nitriding furnaces and have an arrangement for conducting a switching between a mode in which the carburizing/nitriding furnace is used for carburizing/nitriding the steel strip and a mode in which the carburizing/cooling furnace is used for cooling the steel strip.
Furukawa Kusuo
Kaihara Toshikazu
Kuramoto Koshi
Nakagawa Tsuguhiko
Ogawa Takao
Kawasaki Steel Corporation
Moffat & Co.
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