Clad automotive sheet product

Abstract

The present invention relates to an automotive clad sheet product comprising a core Sayer and at least one clad layer wherein the core comprises an alloy of the following composition in weight %: Mg 0.45-0,8, Si 0.45-0.7, Cu 0.05-0.25, Mn 0.05-0.2, Fe up to 0,35, other elements (or impurities) <0,05 each and <0.15 in total, balance aluminium; and the at least one clad layer comprises an alloy of the following composition in weight %: Mg 0.3-0.7, Si 0,3-0.7, Mn up to 0,15, Fe up to 0.35, other elements (impurities) <0.05 each and <0.15 in total, balance aluminium. The clad automotive sheet product provides excellent hemmabtlity which does not substantially change over time and yet also provides a good age-hardening response after bake hardening.

Description

technical field [0001] The present invention relates to composite aluminum panels intended mainly for automotive applications. The panel product consists of a core of 6XXX series aluminum alloy and at least one cladding layer of another 6XXX series aluminum alloy. Background technique [0002] The use of aluminum sheet material in automotive production has been established for many years. A range of different alloys are used depending on the particular requirements of the vehicle designer for specific components. In certain applications, it is desirable for the material to have high strength. Other applications however require higher formability, and in this case strength may not be considered critical. There is also a desire for the material to deform easily under impact, for example in the event of a collision with a pedestrian, such a material could have a lower strength. [0003] For automotive sheet users, formability means two requirements. There is a formability ...

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Problems solved by technology

[0012] Nothing in these prior art disclosures suggests that the combination of the alloy in the core and cladding also provides very good h

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