COMPOSITION FOR CONTROLLING SPANGLE SIZE, A COATED STEEL PRODUCT, AND A COATING METHOD

摘要

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 compoun d constituent in effective amounts to control the spangle facet size of the coated product , improve tension bend rust stain performance, improve coated surface appearance when brushed, and coated product paintability. Constituents include borides such as titanium boride a nd aluminum borides. The method produces a coated steel product that does not require temper rolling for painting.