Based on extensive studies of 1 to 70%Al-Zn alloy coatings on sheet steel, the 55% Al-Zn alloy coating was found to have the optimum combination of corrosion resistance, heat resistance and galvanic protection of sheared edges of sheet. This paper reviews the corrosion and heat resistance of this new coated sheet product under various service conditions, as well as paintability, formability and weldability. This new coated sheet product is in commercial production now in the United States and Australia (John Lysaght, Ltd, Inc) and will be produced soon in Sweden (Svengt Stal). The various commercial applications for this product are described.

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