... , 2.Surface : Oxidation, mill finishing, anodized, powder coated, et Anodized Extruded Aluminium Tubes 1.General Chemical Composition of the aluminum tube Aluminum ... )Stretch (Rpo.2 Mpa)Stretch RateWebster Hardness6063T5All16011088T6All2051808 6061T4All18011016 T6All2652458 Anodized Extruded Aluminium Tubes