Solidification Mechanism of Thin Slab Cast by Horizontal Twin-belt Caster with Stationary Mold Plate

• Published in: Transactions of the Iron and Steel Institute of Japan Vol. 28; no. 7; pp. 553 - 560
• Main Authors: ITOYAMA, Seiji, BESSHO, Nagayasu, FUJII, Tetsuya, NOZAKI, Tsutomu, KUSABA, Takashi
• Format: Journal Article
• Language: English
• Published: The Iron and Steel Institute of Japan 01.01.1988
• Subjects: belt; coiling; cold shut crack; continuous casting; solidification mechanism; thin slab
• ISSN: 0021-1583; 1881-1183
• DOI: 10.2355/isijinternational1966.28.553

In order to study fundamental technologies required for thin slab casting, the solidification mechanism in a mold has been investigated by the use of thin slab of 30mm×100mm cast at withdrawal speed of 3.8 to 5.1m/min with a laboratory scale twin-belt caster. In the caster, a movable steel belt is used as the wide face and a stationary copper plate as the narrow face. From the observation of thin slab cast, it has been concluded that the solidified shell is formed continuously at the wide faces and intermittently at the narrow faces. The occurrence frequency of ripple marks observed on the narrow face is related to the connecting condition between the nozzle and the stationary plate, the tensile strength of the shell and the friction force in the mold. Countermeasures against the occurrence of corner and transverse cracks are discussed in connection with the ripple mark and the brittleness of the γ grain boundary in coiling practice of thin slab cast.