ASTM B221-08 Alloy 6063-T52 Characteristics 6063 Medium strength. Weldable, machinable & formable with large radius. Specifications CHEMICAL COMPOSITION ElementPercentage Al98.9 Cr0.1 max Cu0.1 max Mg0.45 - 0.9 Fe0.35 max Mn0.1 max Si0.2 - 0.6 ...