The bluing steel strapping adopts a special lead-free heat treatment technology to form a certain tensile strength and elongation. At the same time, a bluing film is formed on the surface of the steel strapping, and a layer of water-based wax is applied to form a double-layer protection. Restretch blued steel strapping are often used for automatic packaging of high temperature non-ferrous metals and ferrous metals in hot rolling and cold rolling.