ã€China Aluminum Industry Netã€‘Aluminum and aluminum alloy pipes for producing aluminum round air ducts are generally produced by drawing and extrusion methods. Aluminum tubes are mostly made of industrial aluminum of L2, I.3, L, L5 grades; The needs can be made of aluminum alloys such as LF2, LF, LFs, LFs, LF21, L1, and LYi2. The aluminum circular air duct is made of aluminum sheet as a raw material, and is rolled and processed on a roll machine.
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