What is the primary difference between extruded and drawn aluminium tubes?

Drawn tubes are pulled through a die after initial extrusion, which gives them tighter dimensional tolerances, improved surface finish, and increased strength due to cold working.

How is the chemical composition verified?

It is verified using spectrometric analysis or chemical methods detailed in IS 504.

Does this standard cover tubes for structural columns?

While it covers general engineering tubes, heavy structural aluminium design should typically refer to IS 8147 along with specific structural codes.

IS 734

: 1975

Wrought Aluminium and Aluminium Alloy Drawn Tube for General Engineering Purposes - Specification

CurrentSpecializedSpecificationMaterials Science · Aluminium and Non-Ferrous Metals

Download PDF BIS Portal Google

This standard specifies the requirements for wrought aluminium and aluminium alloy drawn tubes used for general engineering purposes. It establishes criteria for chemical composition, mechanical properties, and dimensional tolerances across various alloy grades and tempers.

Specifies requirements for wrought aluminium and aluminium alloy drawn tubes intended for general engineering purposes.

Quick Reference Values

Purity of unalloyed aluminium (Grade 19000)99.0% minimum

Standard lengths for straight tubes1 to 6 metres

Typical wall thickness tolerance± 10% of nominal thickness (varies by diameter)

Temper designations coveredO, H, W, WP, P

Practical Notes

Drawn tubes provide tighter dimensional tolerances, thinner walls, and better surface finishes compared to extruded tubes.

Engineers must clearly specify the temper designation (e.g., 'O' for annealed, 'WP' for fully heat-treated) during procurement as it dictates the final mechanical strength.

For welding applications, select appropriate alloy grades (like 5000 or 6000 series) as specified in the standard.