HDG (Hot-Dip Glavanized) Galvalume Steel Coil to Peru. I can tell you that the composition of the galvalume steel coil includes 55% aluminum, 43% zinc, and 1.5% silicon. The surface of the galvalume steel coil is anti-finger (also known as AFP) and the thickness ranges from 0.16 mm to 0.8 mm. The width can be between 30 mm to 1250 mm.