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US 2024/0052460 A1Published application
Sheet steel having a deterministic surface structure
AssigneeThyssenKrupp Steel Europe AG
InventorsFabian JUNGE, Burak William CETINKAYA, Gregor MÜLLER
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Abstract
The invention relates to a sheet steel (1) coated with a zinc-based coating and skin-pass rolled with a deterministic surface structure (2), and to a method for producing it.
Claims17
A sheet steel coated with a zinc-based coating and skin-pass rolled with a deterministic surface structure, the surface structure having peak regions and valley regions which are connected to one another via flank regions,
- wherein the coating, as well as zinc and unavoidable impurities, comprises additional elements such as aluminum with an amount of 0.1 up to 5 wt % and magnesium with an amount of 0.1 up to 5 wt % in the coating, the relative concentration of magnesium on the surface of the coating in the valley regions being lower than on the surface of the coating in the peak regions.
A method for producing a sheet steel coated with a zinc-based coating and skin-pass rolled with a deterministic surface structure, comprising the following steps:
- providing a sheet steel coated with a zinc-based coating, the coating, as well as zinc and unavoidable impurities, comprising additional elements such as aluminum with an amount of 0.1 up to 5 wt % and magnesium with an amount of 0.1 up to 5 wt % in the coating,
- skin-pass rolling the coated sheet steel with a skin-pass roll, where the surface of the skin-pass roll which acts on the surface of the sheet steel is furnished with a deterministic surface structure such that after the skin-pass rolling, the surface structure of the coated and rolled sheet steel has peak regions and valley regions which are connected to one another via flank regions, and the exposure to the skin-pass roll establishes a relative concentration of magnesium on the surface of the coating in the valley regions which is lower than on the surface of the coating in the peak regions.
Dependencies are inferred from the claim text.