Method of making high strength aluminum sheet product and product therefrom
US6423164B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1995 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Nov 17, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/05
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing aluminum alloy sheet product includes casting a slab or ingot, homogenizing the cast slab, and hot rolling the homogenized slab to provide an intermediate gauge product. The temperature and other operating parameters of the hot rolling process are controlled so that the temperature of the ingot at the beginning of hot rolling is maintained at a temperature between 925° F. (496° C.) and 1025° F. (552° C.), and the temperature of the intermediate gauge product exiting the hot rolling step is between about 500° F. (260° C.) and 600° F. (316° C.). The intermediate gauge product is then subjected to a cold reduction of 45% to 70%, annealed, and cold rolled to final gauge. The combination of controlling the hot rolling to provide the desired hot line entry temperature and the desired exit temperature of the intermediate gauge product and annealing prior to cold rolling to final gauge minimizes or eliminates the appearance of ridging line defects in the aluminum sheet product when the product is subjected to further straining in a forming operation. An improved aluminum alloy sheet product is produced having a superior surface finish f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.