1.1 This specification covers 55 % aluminum-zinc alloy-coated steel sheet in coils and cut lengths. 1.2 This product is intended for applications requiring corrosion resistance or heat resistance, or both. This specification covers 55% aluminum-zinc alloy-coated steel sheets in coils and cut lengths for applications requiring corrosion resistance or heat resistance or both. The material is available in several designations: commercial steel, forming stee