Extruded aluminum muff tubing ,aluminum alloy tube 6063 Temper O/ ASME SB221

ASME SB221   SPECIFICATION FOR ALUMINUM AND ALUMINUM ALLOY EXTRUDED BARS, RODS, WIRE, PROFILES,AND TUBES

Grade 6063 is an aluminium alloy, with magnesium and silicon as the alloying elements. The standard controlling its composition is maintained by The Aluminum Association. It has generally good mechanical properties and is heat treatable and weldable. It is similar to the British aluminium alloy HE9.

Grade 6063 is the most common alloy used for aluminium extrusion. It allows complex shapes to be formed with very smooth surfaces fit for anodizing and so is popular for visible architectural applications such as window frames, door frames, roofs, and sign frames. Applications requiring higher strength typically use 6061 or 6082 instead.

Mechanical properties
The mechanical properties of 6063 depend greatly on the temper, or heat treatment, of the material. 

6063-O
Un-heat-treated 6063 has maximum tensile strength no more than 130 MPa (19,000 psi), and no specified maximum yield strength. The material has elongation (stretch before ultimate failure) of 18%.

Above article is from Wikipedia

Extruded aluminum finned tubes specifications.

Tube OD        :  2''(Max.)

Tube length    :  No limit.

Fin height       :  16mm(Max.)

Fin thickness  : 13FPI / 12FPI / 11FPI / 10FPI / 9FPI / 8FPI....