Aluminium alloy semi-finished product manufacturing process using recycled raw materials

摘要

A manufacturing process for an intermediate product made of a predetermined 7000 series alloy having a target content of at least one first anti-recrystallizing element Z1 selected from the group consisting of Zr and Cr. This process enables effective recycling of scrap, particularly machining scrap made of 7000 series alloys, in the manufacture of intermediated products with high added value. The product is produced by the steps of:;a) supplying scrap, which may be machining scrap, including at least one second 7000 series alloy having a target content of at least one second anti-recrystallizing element Z2 selected from the group consisting of Zr and Cr, in an amount greater than a maximum accepted content of Z2 in the predetermined alloy;;b) conducting at least one refining step of said scrap to reduce the amount of Z2 to a value below the maximum accepted content of Z2 in the predetermined alloy;;c) producing a batch of liquid metal having nominal composition, in part or in whole, from the refined scrap; and;d) forming the product by casting the liquid metal.