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Aluminum Angle Information. There are two standard types of aluminum angle most commonly produced today, Architectural and Structural.  Structural Aluminum Angle The "Structural" aluminum angle has rounded inside corners and is most commonly produced in the 6061-T6 aluminum alloy, This type of angle is commonly used for (as the name suggest) structural applications where lightweight, yet high strength material is required. The 6061 aluminum alloy offers good corrosion resistance, e …