PURPOSE: To obtain the titled alloy having superior corrosion resistance and causing seizing at a low rate during die casting by restricting the amount of Fe in a die casting Al-Si-Mg alloy and adding one or two among Mn, Zr, Cr and Ti.

CONSTITUTION: This alloy consists of 5W10% Si, 0.2W1.0% Mg, 0.3W0.6% Fe, one or two among 0.1W0.6% Mn, 0.1W0.4% Zr, 0.1W0.4% Cr and 0.1W0.5% Ti, and the balance Al with impurities. The lower limit or more of Fe is required to prevent seizing during die casting, yet more than the upper limit of Fe deteriorates the toughness and corrosion resistance. One or two among Mn, Zr, Cr and Ti prevent said seizing, make the structure fine and enhance the toughness, yet in case of less than the lower limits, the effects are not produced. In case or more than the upper limits, the effects are not improved furthermore, and the elements form compounds together with other component elements and impurity elements, resulting in the formation of hard spots.