Magnesium AZ31B Plate Magnesium AZ31B alloy is available in different forms such as plate, sheet. It is an alternative to aluminum alloys as it has high strength to weight ratio. It is widely available when compared to other magnesium grades. The following datasheet gives an overview of magnesium AZ31B alloy. Magnesium, Mg 97 Aluminum, Al 2.50 - 3.50 Zinc, Zn 0.60 - 1.40 Manganese, Mn 0.20 Silicon, Si 0.10 Copper, Cu 0.050 Calcium, Ca 0.040 Iron, Fe 0.0050 Nickel, Ni 0.0050 Available Plate Magnesium AZ31B Plate 2mm Thk Magnesium AZ31B Plate 4mm Thk Magnesium AZ31B Plate 6mm Thk