| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.7 ( March 1983 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Manufacture of Soft-temper Blackplates in Kawatetsu Multipurpose Continuous Annealing Line (KM-CAL) Hideo Kuguminato, Yoshio Izumiyama, Hideo Sunami, Fumiya Yanagishima, Yoshio Nakazato, Takashi Obara |
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Synopsis : The multipurpose continuous annealing line developed by Kawasaki Steel Corporation (KM-CAL) has rapid cooling and overaging sections to additionally manufacture soft-temper tin mill blackplates which have so far been produced by the batch annealing process. Further, improvements such as in-furnace bridle rolls are incorporated in this continuous annealing line to permit rapid cooling without the deterioration of flatness even in extra-thin steel sheets. The conditions for the production of soft-temper tin mill blackplates by KM-CAL are: (1)use of low-carbon Al-killed CC slabs of 0.02 to 0.07%C and not more than 0.003%N, (2)hot mill coiling temperature of 620, (3)continuous annealing conditions: recrystallization temperature of 700, rapid cooling rate of 40 to 70/s and overaging at 400 to 450 for 60 sec, and (4)temper rolling with at low reduction of 0.8%. Commercial production was successfully carried out. |
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