The surface of the aluminum tube probably would be oxidized, which is a normal characteristic of aluminum. However, it does not affect its use. If you need a beautiful and perfect appearance, it is recommended to grind the surface
6063 Aluminium Alloy Round Tube, wall thickness 2mm;Length 300mm(11.8 inch) ,500mm(19.7 inch);outer diameter( OD) varies from 6mm to 70 mm
Specification:
Material: 6063 Aluminium Alloy
Wall Thickness: 2mm
Length: 300mm(11.8 inch) ,500mm(19.7 inch)
Outer Diameter:6mm 7mm 8mm 9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm 18mm 19mm 20mm 21mm
22mm 23mm 24mm 25mm 26mm 27mm 28mm 29mm 30mm 32mm 34mm 35mm 36mm 38mm 40mm 42mm 44mm 45mm 46mm 48mm 49mm 50mm 56mm 60mm 64mm 70mm
(Inner diameter=outer diameter - wall thickness - wall thickness)
Package Includes:
1 Piece Aluminium Alloy straight Round Tube
Features:
1,Has good mechanical properties, is heat treatable and weldable
2,Allows complex shapes to be formed with very smooth surfaces fit for anodizing
3,Popular for visible architectural applications such as window frames, door frames, roofs, and sign frames