ALUMINIUM ALLOY AND EXTRUSION

摘要

A population of extrusion billets has a specification such that every billet is of an alloy of composition (in wt.%): Fe <0.35; Si 0.20-0.6; Mn <0.10; Mg 0.25-0.9; Cu <0.015; Ti <0.10; Cr <0.10; Zn <0.03; balance Al of commercial purity. After ageing to T5 or T6 temper, extruded sections can be etched and anodised to give extruded matt anodised sections having improved properties.