Process for producing alsimgcu alloy products with improved resistance to intercrystalline corrosion
US5858134A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1997 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Apr 4, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/057
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention concerns a process for the production of rolled or extruded products of high strength AlSiMgCu aluminium alloy with good intergranular corrosion resistance, comprising the following steps: PA1 casting a plate or billet with the following composition (by weight): PA2 Si: 0.7-1.3% PA2 Mg: 0.6-1.1% PA2 Cu: 0.5-1.1% PA2 Mn: 0.3-0.8% PA2 Zr: <0.20% PA2 Fe: <0.30% PA2 Zn: <1% PA2 Ag: <1% PA2 Cr: <0.25% other elements: <0.05% each and <0.15% in total remainder: aluminium; with: Mg/Si<1 PA1 homogenising in the range 470.degree. C. to 570.degree. C.; PA1 hot working, and optionally cold working; PA1 solution heat treating in the range 540.degree. C. to 570.degree. C.; PA1 quenching; PA1 annealing, comprising at least one temperature plateau in the range 150.degree. C. to 250.degree. C., preferably in the range 165.degree. C. to 220.degree. C., the total period measured as the equivalent time at 175.degree. C. being in the range 30 h to 300 h.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.