HIGH STRENGTH ALUMINUM EXTRUDED MATERIAL EXCELLENT IN FORMABILITY

摘要

PURPOSE:To obtain an Al extruded material having high strength and excellent in formability by specifying the content of Mg, Zn, Cu and Cr in an Al base. CONSTITUTION:The compsn. of an extruded material is formed of, by weight, 3.0 to 5.0% Mg, 0.4 to 1.5% Zn, 0.4 to 1.5% Cu, 0.05 to 0.3% Cr and the balance Al with inevitable impurities. This extruded material has high strength compared to that of the conventional alloy and is excellent in formability even if its elongation is a high one equal to or above that of the conventional alloy. Thus, the lightening in weight and miniaturizing of automobiles, bicycles or the like can be promoted.