FABRICATION OF THIN ALUMINUM ALLOY SLABS BY ELECTROMAGNETIC CASTING

摘要

Effects of bottom block, spout shape and casting rate on thickness, outward appearance and structure of aluminum alloy slabs were evaluated in order to improve the electromagnetic casting process for manufacturing thin slabs. Furthermore, thin slabs of 5052 aluminum alloy were directly cold-rolled and tensile properties of the rolled sheets were evaluated. Slabs with a flat surface, fine microstructure and about 7mm in thickness are obtained by using a bottom block having a thickness of 6mm and a spout with cover. Even when cold-rolling to a reduction of 75%, there is no surface defect. The cold-rolled sheet has tensile properties that satisfy the JIS requirements except for tensile strength of O-treated sheet, which has a value that is higher than that specified by JIS. However, the tensile properties are superior to those of the cold-rolled sheet obtained from DC hot plate.