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 anodized to give extruded matte anodized sections having improved properties.

Una población de los billetes de la protuberancia tiene una especificación tales que cada billete está de una aleación de la composición (en los pesos %): FE

 
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> Nickel-base alloy and article manufactured thereof

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