Development of New 55%Al-Zn Alloy Coated Steel Sheets with Excellent Corrosion Resistance and Formability, "SUPER GENIUS" and "GALFLEX-COLOR"

Higher durability is increasingly required for construction materials in order to conserve resources and reduce maintenance work. Since 55%Al-Zn alloy coated steel sheets exhibit excellent corrosion resistance, their use in construction for roofing and siding is expanding. NKK has developed and marketed a high-quality, thin organic composite coated 55%Al-Zn alloy coated steel sheet, "SUPER GENIUS", and a prepainted steel sheet. "GALFLEX-COLOR"' for these applications. This paper outlines the development processes and main properties of these two new products.