Abstract
In order to improve the electromagnetic casting process for manufacturing thin slabs, the influence of bottom block on the electromagnetic field in the E.M. coil was investigated. Effects of the spout shapes and casting rate were also evaluated on outward appearance and structure of thin slabs. Furthermore, the thin 5052 aluminum alloy slab was cold-rolled to a final thickness reduction of 80% and the outward appearance and tensile properties of the rolled sheets was evaluated. Increase in the thickness of bottom block in the E.M. coil extremely decreases the E.M. pressure. Furthermore, a convex line is formed at the surface of the slab due to the flow of molten metal from the spout during the formation of meniscus. Therefore, a spout with cover is used in the fabrication of the slabs for the purpose of adjusting the meniscus thickness. A slab with a flat surface and 13 mm in thickness is obtained by using the spout with cover. When the fabricated thin slab of 5052 alloy is cold-rolled to a final thickness reduction of 80%, there is no surface defect, but edge cracks generate in the rolled sheet. The thin slab has tensile strength and elongation which satisfies the JIS requirements and is almost same tensile properties of the cold-rolled commercial DC hot plate.
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