Round Aluminum Tube | 6000 Series Extruded Aluminium Pipe Cut to Length for Door and Window Frames
The round aluminum tube described on this page is an extruded aluminium pipe made from 6000 series alloy and supplied cut to length for door and window frame building use. Because the section is formed by hot extrusion rather than by rolling and welding, the wall thickness stays uniform along the whole length of the tube, which keeps frame corners tight and reduces fitting work on site.
Alloy and temper. The tube is supplied as an aluminium alloy product rather than commercially pure metal. The extrusion programme covers the 1000 to 7000 series range, with 6000 series material used as the standard choice for architectural frames because it combines moderate strength with good formability and takes an anodised or painted finish evenly, so one batch gives a consistent appearance across a complete window or door set.
Dimensions and tolerances. Outside diameter, wall thickness and length are all made to order. Wall thickness is available from 0.3 mm up to 50 mm, and the general dimensional tolerance is held to plus or minus one percent. Length is supplied cut to the customer's cutting list, which removes a sawing step from the buyer's production line and lowers scrap. Any length within the transport limit can be produced from the same tooling, so repeat orders stay consistent.
Surface finish. Four standard treatments are offered: mill finish for parts that will be machined or painted later; anodised for a hard, corrosion resistant layer with a metallic appearance; polished for a bright decorative look; and powder coating for a durable coloured surface. Standard colours include silver, bronze, champagne, black and golden, and custom colours can be matched to a supplied sample. Exterior frames normally use anodised or powder coated tube.
Mechanical properties and standards. Typical hardness of the supplied tube falls in the 160 to 205 MPa range depending on alloy and temper, which suits window and door frames, light structural supports and general industrial framing. Aluminium is roughly one third the density of steel, so a frame made from this tube is lighter to handle and cheaper to ship while still holding glass. Production follows GB/T 5237, EN 12020-1.2, ASTM B85-96 and JIS H5302, with material origin in Jiangsu, China.
Applications and supply. The most common use is the fabrication of door and window frames, where the tube is cut, mitred and joined into a complete sash. The same section also serves partition frames, shop front framing, glazed screen supports, handrail posts and display stand frames. Tube is supplied in mill lengths or cut to the customer's list, banded and wrapped for transport, with cut lengths labelled by position. An extruded tube has no weld seam, so it can be bent or curved after delivery without the seam opening.