Coating composition for steel_product, a coated steel product, and a steel product coating method
AssigneeBethlehem Steel Corporation
InventorsFritz J. Friedersdorf, Erin T. McDevitt, H. E. George Rommal
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Abstract
A method of coating of steel products such as plate and sheet using an aluminum-zinc coating alloy includes modifying the coating bath with a particulate compound constituent in effective amounts to decrease the spangle facet size of the coated product, improve tension bend rust stain performance, and coated product paintability. Constituents include borides such as titanium boride and aluminum borides, carbides such as titanium carbide, and aluminides such as titanium aluminide. The method produces a coated steel product that does not require temper rolling for painting.
Claims20
In a method of coating a steel product using a molten aluminum-zinc alloy bath, the improvement comprising modifying the composition of the aluminum-zinc alloy by adding an effective amount of one or more of a particulate compound constituent selected from the group consisting of boride compounds having one of titanium and aluminum, aluminide compounds containing titanium and iron, and carbide compounds containing titanium, vanadium, iron, and tungsten.
In a coated steel article comprising a steel substrate;
- and an aluminum-zinc coating thereon, the improvement comprising the aluminum-zinc coating being modified with an effective amount of one or more of a particulate compound constituent selected from the group consisting of boride compounds having one of titanium and aluminum, aluminide compounds containing titanium and iron, and carbide compounds containing titanium, vanadium, iron, and tungsten.
In an aluminum-zinc steel product coating composition, the improvement comprising the aluminum-zinc alloy including an effective amount of one or more of a particulate compound constituent selected from the group consisting of boride compounds having one of titanium and aluminum, aluminide compounds containing titanium and iron, and carbide compounds containing titanium, vanadium, iron, and tungsten.
Dependencies are inferred from the claim text.