Rio Tinto Group
Aluminum Extrusion Alloy

Abstract:

An aluminum alloy includes Si and Mg in amounts (wt. %) within a quadrilateral defined by the following coordinates on an Mg/Si plot: I: 1.15 Si, 0.70 Mg, II: 0.95 Si, 0.55 Mg; III: 0.75 Si, 0.65 Mg; and IV: 0.95 Si, 0.85 Mg. The alloy also includes, in weight percent: Mn 0.40-0.80 Fe 0.25 max Cr 0.05-0.18 Cu 0.30-0.90 Ti 0.05 max Zr 0.03 max Zn 0.03 max B 0.01 max with the remainder of the alloy being aluminum and unavoidable impurities in amounts of up to 0.05 wt. % each and 0.15 wt. % total.