摘要 |
This invention is intended to provide a twin-roll continuous casting method that that makes it possible to control occurrence of casting defects in the center part of plate thickness, for Al-Mg series aluminum alloy, a material featuring a wide temperature range for solid and liquid phases coexistence. In the above method of manufacturing Al-Mg series aluminum alloy cast plate 4, the plate contains Mg in a predetermined amount and has relatively thick plate size, while casting is performed by a twin-roll type continuous casting method. The twin rolls 1 and 2 have the roll diameter D (m), and the rolls have a circumferential velocity v (m/s). The circumferential length from the points 5 and 5 where molten metal starts contact with the rolls 1 and 2, to the kiss points 6 and 6 is called the solidification distance s (m), and the roll gap at the kiss points 6 and 6 is equal to the thickness of the cast plate d(m). There are made up specific relations among the above factors, and the continuous casting operation is carried out while satisfying such relations.
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