Aluminium alloy semi-finished product manufacturing process using recycled raw materials
US6454832B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2000 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Nov 13, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
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; andd) forming the product by casting the liquid metal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.