6063 T5 Aluminum Elbow

What is 6063 T5 Aluminum Elbow

6063 is a wrought aluminum-magnesium-silicon (Al-Mg-Si) alloy in the 6000 series, and the most widely extruded aluminum alloy in the world. Its balanced magnesium and silicon content forms the strengthening precipitate Mg₂Si, producing a heat-treatable alloy that still extrudes easily into complex hollow and thin-wall shapes with an exceptionally smooth surface. As a 6000-series alloy, 6063 sits between the non-heat-treatable 1xxx (pure aluminum) and the work-hardening 3xxx/5xxx families on one side and the higher-strength 7xxx aerospace grades on the other, offering a middle ground of heat-treatable strength, corrosion resistance, and - most importantly - extrudability.

The T5 temper means the section was cooled from the extrusion temperature (press-quenched) and then artificially aged - no separate solution heat treatment is applied. The result is a stable, moderately strengthened condition with a typical ultimate tensile strength of 186 MPa (27 ksi) and outstanding surface finish and anodizing response.

An aluminum elbow is a pipe or tube fitting that changes flow direction, most commonly by 45°, 90°, or 180°. Long-radius (LR) elbows use a centerline radius of 1.5 × the nominal pipe size (NPS); short-radius (SR) elbows use 1.0 × NPS. In aluminum systems, 6063-T5 elbows are produced primarily as seamless extrusions - either extruded directly to the elbow profile or bent from extruded tube - which keeps the welded heat-affected zone (HAZ) out of the finished part.

Why 6063-T5 is selected for elbows:

Extrudes to tight tolerances with a surface ready for anodizing.

Roughly 65% lighter than a carbon-steel equivalent (density 2.70 g/cm³).

Excellent atmospheric corrosion resistance from the self-healing oxide film.

Readily weldable by TIG and MIG processes.

Lower cost than 6061-T6 for service that does not require maximum strength.

Connection type follows the system design. Butt-weld elbows are supplied with beveled ends prepared to ASME B16.25 and joined by TIG or MIG welding; socket-weld and threaded ends on forged fittings are covered by ASME B16.52, and flanged ends pair with aluminum flanges to ASME B16.5 made from ASTM B247 forgings. When ordering, specify alloy and temper, angle, nominal size, wall thickness (in mm or schedule), radius type (LR or SR), end preparation, finish, and the governing standard.

Chemical Composition

The composition below follows the Aluminum Association limits for 6063 as referenced by ASTM B221 and EN 573-3. The deliberately low copper and iron levels are what give 6063 its uniform anodizing finish.

The magnesium-to-silicon ratio is balanced so that most of both elements combine as Mg₂Si rather than remaining as free silicon or excess magnesium. Excess silicon improves extrudability and aging response, which is why 6063 reaches useful strength at the low 175 °C aging temperature.

Mechanical Properties

Values below are typical for extruded sections. Minimum guaranteed values under ASTM B221 / EN 755-2 decrease as section thickness increases - for T5 material between 13 mm and 25 mm thick, the Aluminum Association minimum tensile strength drops to 130 MPa (19 ksi), with yield strength of 90 MPa (13 ksi). Confirm the exact guaranteed values against your wall thickness.

Physical & Thermal Properties

At 2.70 g/cm³, a 6063-T5 elbow weighs about one-third of a carbon-steel elbow of the same size, cutting handling, support, and topside load in weight-sensitive installations. Thermal conductivity of roughly 209 W/m·K is the reason 6063 is favored for heat-sink and heat-exchange-related extrusions. In long pipe runs, the expansion of about 23.4 µm/m per °C must be accommodated with expansion loops or flexible supports.

Heat Treatment & Temper Guide

• T5 - cooled from the extrusion temperature (press quench, forced air), then artificially aged at 175 ±5 °C (350 °F) for about 8 hours. No separate solution treatment, which lowers cost while delivering consistent strength and finish.
• T6 - solution heat treated at 530 ±5 °C (985 °F), water quenched, then artificially aged at 175 ±5 °C for 8 hours. Higher strength than T5 for the same shape.
• T4 - solution heat treated and naturally aged; the softest solution-treated condition and the best for tight forming before a final age.
• O (annealed) - heated to 413 °C (775 °F), held 2–3 hours, and furnace cooled for maximum ductility.

T5 is the default temper for extruded elbows because it skips the solution step. Where the same geometry needs higher strength, T6 is specified instead. Aging time and temperature control both final strength and anodize tint - over-aging slightly lowers strength but stabilizes the part against slow natural aging in service.

Equivalent Designations

Corrosion Resistance

The 6000 series forms a natural, self-healing aluminum-oxide barrier; the practical question is how the elbow behaves in each specific environment.

Atmospheric - Excellent. A self-healing oxide film protects the surface, and anodizing extends service life further, which is why 6063 is the standard architectural extrusion alloy.

Marine / coastal - Good in salt-spray exposure when anodized or painted, but below the 5xxx series for continuous seawater immersion. Avoid direct seawater service unless the surface is protected or the alloy is changed.

Galvanic corrosion - Isolate 6063 from copper, brass, carbon steel, and other more-noble metals using isolation washers, gaskets, or coatings; direct bimetallic contact accelerates attack on the aluminum.

Stress-corrosion cracking (SCC) - The 6000 series is generally resistant to SCC in normal atmospheric service, and 6063-T5/T6 is not considered SCC-prone in typical applications.

Finish-related - Anodized coatings of 10–25 µm markedly improve both abrasion and corrosion resistance; mill finish is adequate for indoor or dry service.

Fabrication

Welding. TIG (GTAW) is preferred for thin sections; MIG (GMAW) suits thicker walls. Use ER4043 (Al-Si) or ER5356 (Al-Mg) filler. ER4043 flows easily and resists cracking, but turns grey or dark when anodized, so it is unsuitable for visible architectural work. ER5356 gives higher weld strength and a closer color match after anodizing - use it for architectural and visible parts. Welding reduces strength in the heat-affected zone, and T5 material is not re-solution-treated after welding; derate welded joints and verify per the applicable piping code for pressure service.

Remove the oxide layer and clean with a stainless brush and solvent before welding - aluminum oxide melts at a far higher temperature than the metal itself and must not be trapped in the joint.

Machining. 6063-T5 is on the "gummy" side, producing long stringy chips rather than clean-breaking ones. Use sharp carbide tooling, rigid fixturing, and adequate coolant, and run at lower speeds than 6061.

Formability. Extrudability is excellent, which is the point of the alloy. Cold forming is limited in the T5 condition; for tight bending, form in T4 and age to T5 or T6 afterward. Since elbows are normally extruded directly to angle, field forming is rarely required.

Surface Finishes

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Applications

6063-T5 elbows are specified where the combined demands of low weight, corrosion resistance, and a clean finish outweigh peak strength. Typical uses span the following industries.

6063 vs other aluminum Comparison

Against 6061-T6, the key trade-off is strength versus finish: 6061-T6 yields roughly 90% more strength but anodizes less uniformly and costs more. Choose 6063-T5 when finish and extrudability drive the decision, and 6061-T6 when strength governs.

Why Choose GNEE

18 years of aluminum export experience with factory-direct pricing and a flexible MOQ set to your specification.

Custom angles, radii, and wall thicknesses made to drawing - standard DN15–DN350, larger sizes on request.

Full documentation - Mill Test Certificate (EN 10204 3.1/3.2) and third-party inspection (SGS, BV) on request.

Coordinated finishes - mill, anodized, powder-coated, and PVDF from a single supplier.

Export-grade packaging in plywood cases or pallets, with a 15–35 day lead time for standard sizes.

FAQ

What is the difference between 6063-T5 and 6063-T6?
6063-T5 is cooled from the extrusion temperature and then artificially aged, giving a typical tensile strength of 186 MPa (27 ksi). 6063-T6 adds a separate solution heat treatment before aging, raising typical tensile strength to 241 MPa (35 ksi). T5 costs less and anodizes slightly more uniformly.

Can 6063-T5 aluminum elbows be welded?
Yes. TIG and MIG welding work well with ER4043 or ER5356 filler. Welding lowers strength in the heat-affected zone, so pressure service should be derated and verified against the applicable code.

Which standards do 6063-T5 elbows conform to?
Material and manufacturing to ASTM B361, and dimensions to ASME B16.9 for butt-weld elbows. Socket-weld and threaded fittings fall under ASME B16.52.

What sizes and angles are available?
Standard angles are 45°, 90°, and 180°, in long-radius (R = 1.5 × NPS) and short-radius (R = 1.0 × NPS). Standard sizes run DN15 to DN350, with larger or custom geometries produced to drawing.

What is the MOQ and lead time?
The MOQ depends on size and specification and is kept flexible for export buyers. Standard sizes ship in 15–35 days; custom orders run 25–45 days.

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