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Galvalumed Steel Roofing Sheet
Galvalumed Steel Roofing Sheet, a double-sided hot-dip galvanized steel sheet with a steel sheet substrate conforming to ASTM A792 GRADE Class 80 or AS1397 G550 grade with a tensile strength of 5600 kg/cm. The metal coating consists of 55% aluminum, 43.5% (or 43.6%) zinc and 1.5% (or 1.4%) silicon. It has long-term corrosion resistance and heat resistance of aluminum; zinc protects the cutting edge and scratch gap; while a small amount of silicon can effectively prevent the aluminum-zinc alloy from chemically reacting to form fragments and make the alloy coating more uniform.
