6082 Aerospace Aluminium Bar (L111, T6 / T6511)

Why 6082 bar is used in aerospace

6082 contains more silicon and manganese than 6061 and almost no copper. The extra silicon raises aged strength; manganese controls grain structure in extrusions. The result is a bar with slightly higher strength than 6061 in most sizes and better resistance to corrosion.

British and European aerospace practice adopted 6082 long ago. The UK L-series lists it in every wrought form: L111 for bars and sections, L112 for forging stock and forgings, L113 for sheet, L114 for drawn tube and L115 for plate. EN 2326 and EN 2636 carry the same material into the European aerospace standards as AL-P6082-T6, with EN 2636 adding a limit on peripheral coarse grain.

In aircraft, 6082 bar goes into machined brackets and fittings for secondary structure, interior and cargo system components, hinge pins and bushes, actuator and linkage parts, avionics and equipment racks, and a very wide range of ground support equipment. It is not used for engine blades, turbine discs or other hot-section parts, which need nickel or titanium alloys, nor for highly loaded primary structure, where 7xxx and 2xxx alloys dominate.

6082 chemical composition (wt %)

Limits follow EN 573-3 for EN AW-6082 and the Aluminum Association registration, which are identical. BS L111 and EN 2326 call the same chemistry.

Mechanical properties of 6082 bar

Minimum values for extruded bar vary with size because thick sections cool more slowly during quenching. The figures below are EN 755-2 limits for T6 bar; BS L111 gives the same values for its size bands. Design to these minimums, not to the higher typical values.

Typical T6 values are about 330 – 340 MPa tensile, 290 – 310 MPa proof stress and 95 – 100 HB. L111 quotes a proof stress of 255 MPa up to 20 mm and 270 MPa from 20 to 150 mm, slightly above EN 755-2.

6082 bar tempers and when to use them

Controlling the coarse-grain ring in 6082 bar

Extruded 6082 bar can form a band of large, recrystallised grains near the surface, called peripheral coarse grain (PCG) or a coarse-grain ring. It develops where the outer layer is heavily sheared in the die and then recrystallises during solution treatment. PCG lowers strength and fatigue performance locally, can cause orange-peel on bent or anodised surfaces and may be removed when bar is turned, revealing a different structure under the skin.

1. ChemistryKeep manganese and chromium in the upper part of their ranges, as these form dispersoids that pin grain boundaries and resist recrystallisation.
2. Billet practiceHomogenise the cast billet correctly and add titanium-boron grain refiner during casting for a fine, even starting structure.
3. Extrusion parametersControl billet temperature, ram speed and die design to reduce surface shear and heat build-up.
4. Quench routePress quenching or carefully controlled separate solution treatment limits the time available for grain growth.
5. VerificationMacro-etch a slice from each lot and measure PCG depth. EN 2636 sets limits on the depth of coarse grain; specify it when PCG matters.

For machined fittings, ask for EN 2636 or a stated maximum PCG depth, or allow enough machining stock to remove the affected layer.

6082 standards and international designations

Some older stock lists also cite DTD or BS L100-series numbers for 6082. Send us the exact reference from your drawing and we will confirm which document governs before quoting.

6082 bar sizes and weights

Round bar weight per metre is π/4 × d² × 2.70 ÷ 1000 kg (d in mm):

Machining, welding and finishing 6082 bar

Typical aerospace uses of 6082 bar

• Machined fittings: brackets, clips, lugs and mounts for secondary structure and systems
• Cabin and cargo systems: seat and cargo-handling hardware, roller and guide parts
• Mechanisms: hinge pins, bushes, linkages and actuator end fittings with modest loads
• Avionics and electronics: housings, chassis and heat-sinking blocks
• Ground support equipment: towbars, jacks, maintenance stands, engine dollies and access platforms
• Space and UAV: brackets and frames in small satellites and unmanned aircraft

A typical example is an engine-stand cradle for line maintenance: the welded frame uses 6082-T6 tube and the pick-up blocks are machined from 6082-T6511 round bar, so the entire assembly shares one alloy and finish.

6082 bar compared with 6061, 6066 and 7075

6082 and 6061 are often interchangeable in practice, but they are not identical, so a substitution needs approval. Read our 6061 vs 6082 comparison for details.

6082 in other forms and related aerospace bar

How to order 6082 aerospace bar

1. SpecifyAlloy and temper, shape and size, length or cut pieces, any PCG limit, quantity and the governing specification with its revision (BS L111, EN 2326, EN 2636 or EN 755-2).
2. ConfirmWe confirm the specification can be met, the tolerance class, any extra tests and the delivery terms (EXW, FOB, CIF or DAP).
3. InspectMaterial is checked for dimensions, straightness and surface condition; tests named on the order are carried out or arranged with a third party.
4. DocumentEach lot ships with a mill test certificate to EN 10204 3.1 showing chemistry and mechanical results, traceable to the cast or lot number.
5. Pack and shipExport packing in sealed, moisture-protected wooden cases or on pallets, shipped by sea or air to your port or door.

6082 aerospace aluminium (aluminum) bar: FAQs