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1 Change and Development of Continuous Casting Technology Abstract It is about 60 years that history of continuous casting process in our country. From the start of commercial operation of the first continuous casting machine in Japan in 1955, the basic technology equipment and operation of continuous casting process has been established in the 1970 s. Today continuous casting ratio of our country has reached over 98%. In Nippon Steel Corporation, the ratio has reached 100% in Continuous casting technology has been developed in order to supply more stable and higher quality steel products. In this paper, we describe recent technology developments and changes since the introduction of the continuous casting machine.

2 Yawata Yawata Nagoya Nagoya Kimitsu Kimitsu Kimitsu Oita Oita 2st 3st No.1CC No.2CC No.2CC No.3CC No.6CC No.4CC No.5CC Type VB VB VB VB VB VB VB VB VB Strand Machine radius (m) Metallurgical length (m) Start-up Revamping [VB] Revamping [metallurgical length extension] Tundish shape Boat Triangle H-shape H-shape Boat Boat Boat Boat Boat Tundish capacity (t) Casting thickness (mm) (300) , Width range (mm) Vertical length (m)

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