A 90° elbow that does not match the pipe at the site means rework, downtime, and a missed milestone-and it is usually found only after the container is already unloaded. GNEE is an aluminum manufacturer with 18 years of export experience, supplying ASTM B361 / ASME B16.9 aluminum butt-weld fittings in a full range of alloys to distributors, fabricators, and engineering contractors in more than 100 countries.
Before packaging we re-check the critical fit dimensions-outside diameter, wall, and bevel-against the approved drawing, so a mismatch is caught in our workshop, not at your receiving dock. Our aluminum 90° long radius elbow gives you a lightweight, corrosion-resistant, weldable change of direction for piping systems, available in 6061, 6063, 6082, 5083, 5052, 3003, and 1050/1060, so you can match the grade to the service.
Contact now to discuss sizes, schedules, and the right alloy for your project.
What is Aluminum 90° Long Radius Elbow?
An aluminum 90° long radius elbow is a butt-weld pipe fitting that turns a pipeline by 90 degrees using a centerline radius of 1.5 × the nominal pipe diameter (1.5D). The long radius (LR) profile makes a gentler turn than a short radius (1D) elbow, which lowers turbulence, reduces pressure loss, and limits flow-induced vibration. For most process and utility piping, LR elbows are the default unless installation space is restricted.
Aluminum is selected over carbon steel when weight, corrosion, or non-sparking behavior drives the design. At roughly one-third the density of steel, aluminum elbows cut handling and support loads and resist atmospheric corrosion without coating. The right alloy depends on the service: 6xxx grades for strength and weldability, 5xxx for marine duty, and 3xxx and 1xxx for formability and purity.
Available Aluminum Alloy Grades
GNEE produces 90° LR aluminum elbows in the following alloys.
6061-T6-Heat-treatable Al-Mg-Si alloy with balanced strength (about 310 MPa UTS) and good weldability; the most common grade for structural and process piping. 6061-T6 Aluminum 90° Elbow
6063-T6-Al-Mg-Si grade with a smoother surface finish and lower strength (about 241 MPa UTS); favored for architectural and extruded routes. 6063-T6 Aluminum 90° Elbow
6082-T6-Higher-strength 6xxx alloy (often called HE30 in Europe) with good corrosion resistance; used where a stronger alternative to 6063 is needed. 6082-T6 Aluminum 90° Elbow
5083-5xxx marine alloy with excellent seawater resistance and non-heat-treatable; the first choice for marine and offshore topside lines. 5083 Aluminum 90° Elbow
5052-5xxx grade with good marine performance and formability at moderate strength; general corrosion-duty piping. 5052 Aluminum 90° Elbow
3003-Al-Mn alloy, low cost and highly formable with lower strength; utility, HVAC, and decorative lines. 3003 Aluminum 90° Elbow
1050 / 1060-Commercially pure 1xxx aluminum with the best corrosion resistance and conductivity but low strength; chemical and food-contact lines.
Aluminum 90° Long Radius Elbow Specifications Table
| Parameter | Specification | Standard / Note |
|---|---|---|
| Product type | 90° long radius butt-weld elbow | - |
| Material | 6061, 6063, 6082, 5083, 5052, 3003, 1050/1060 | ASTM B361 / ASTM B241 |
| Standards | ASTM B361, ASME B16.9 | Dimensions per ASME B16.9 |
| Weld-end preparation | Beveled per ASME B16.25 | Plain end on request |
| Size range | 1/2"–24" (DN15–DN600) | Larger sizes on technical review |
| Radius | Long radius 1.5D | ASME B16.9 |
| Wall thickness | SCH 5S, 10S, 40S, 80S; custom wall | Matched to pipe schedule |
| Angle tolerance | ±0.5° | Shop practice |
| Center-to-end (A), examples | 1/2"=38 mm; 2"=152 mm; 4"=305 mm; 8"=610 mm; 12"=914 mm | Per ASME B16.9 |
| Working pressure | Schedule- and code-dependent | Confirm per ASME B31.3 |
| Temperature range | −50 to +204 °C (−58 to +400 °F) for 6xxx | Derate above 150°C; 5xxx/ 1xxx differ |
| Inspection | Dimensional, visual, NDT as specified | MTC EN 10204 3.1 shipped |
Physical & Thermal Properties
Representative values for 6xxx alloys: 5xxx and 1xxx vary slightly (see comparison table).
| Property | Value (metric) | Value (imperial) |
|---|---|---|
| Density | 2.66–2.81 g/cm³ | 0.096–0.102 lb/in³ |
| Melting range | 555–650°C (alloy-dependent) | 1030–1205°F |
| Modulus of elasticity | 68.9 GPa (6xxx) | 10.0 × 10⁶ psi |
| Thermal conductivity | 120–200 W/m·K | 830–1380 BTU·in/hr·ft²·°F |
| Coefficient of thermal expansion | 23.2–23.9 µm/m·°C | 12.9–13.3 µin/in·°F |
| Electrical conductivity | 35–60% IACS | 35–60% IACS |
Heat Treatment & Temper Guide
6xxx (6061 / 6063 / 6082): Heat-treatable. Tempers include O (annealed), T4 (solution + natural age), and T6 (solution at 530 ± 5 °C, water quench, artificial age 175 ± 5 °C × 8 h). T6 gives the highest standard strength.
5xxx (5052 / 5083): Non-heat-treatable; supplied in strain-hardened H tempers (e.g., H32, H111, H116). Strength comes from cold work, not heat treatment.
3xxx (3003) and 1xxx (1050/1060): Non-heat-treatable; supplied annealed (O) or strain-hardened (H14). Formability is excellent.
Note: forming and welding can locally anneal heat-treatable grades near the weld, reducing strength in the heat-affected zone. Design allowances or post-weld heat treatment may be needed for welded 6xxx systems.
Equivalent Designations
| Grade | UNS | EN | Common name |
|---|---|---|---|
| 6061 | A96061 | EN AW-6061 (Al Mg1SiCu) | HE20 |
| 6063 | A96063 | EN AW-6063 (Al Mg0.7Si) | HE9 |
| 6082 | A96082 | EN AW-6082 (Al Si1MgMn) | HE30 |
| 5083 | A95083 | EN AW-5083 (Al Mg4.5Mn0.7) | - |
| 5052 | A95052 | EN AW-5052 (Al Mg2.5) | - |
| 3003 | A93003 | EN AW-3003 (Al Mn1Cu) | - |
| 1050 | A91050 | EN AW-1050A | - |
| 1060 | A91060 | EN AW-1060 | - |
Corrosion Resistance
Aluminum forms a self-healing oxide layer that protects against most normal atmospheres. Performance by environment:
Atmospheric: Good in rural, urban, and industrial air; outdoor service is routine with or without coating.
Marine: 5xxx grades (5083/5052) resist seawater immersion best; 6xxx suits atmospheric marine and topside duty. Isolate from steel/copper in wet service.
Galvanic: Aluminum is anodic to steel and copper alloys. Use dielectric isolators or coatings where dissimilar metals meet in moisture.
Stress corrosion cracking (SCC): Low susceptibility in 6xxx and 5xxx versus 7xxx; avoid sustained tensile stress plus aggressive environment.
With finish: Anodizing or powder coating extends life and improves appearance in aggressive or hygienic duty.
Fabrication
Welding: Join with GTAW (TIG) or GMAW (MIG). Recommended fillers are ER4043 for good flow and closer post-anodize color match, or ER5356 where higher post-weld strength is required. Qualify the procedure; expect HAZ strength loss in 6xxx.
Machining: Aluminum elbows machine cleanly with standard carbide tooling for end facing, drilling, and flange features.
Formability: 6xxx in O/T4 and 3xxx/1xxx/5xxx in soft tempers form readily; most elbows are formed from tube then aged (6xxx) or supplied in the required temper.
Quality Inspection
When an elbow arrives mismatched or with a hidden weld flaw, the real cost is not the part - it is the downtime, the rework crew, and the milestone you miss at the site. We treat the pre-shipment check as the step that protects you, not a formality.
Before packaging, every elbow is checked against the approved drawing and your order requirements. For welded constructions we verify the weld profile and run visual examination per the agreed procedure, and apply dye-penetrant (PT) or ultrasonic (UT) testing where the project specifies it. Critical fit dimensions - outside diameter, wall thickness, bevel angle, and center-to-end (A) - are measured so the elbow seats on your pipe the first time.
Acceptance is judged against the confirmed drawing, sample, or your stated requirement, not a generic "pass." If a dimension or weld result falls outside the limit, we isolate that piece from the batch, re-check it with a second method, and decide rework or replacement before it can move to the next process. Problems stay in our workshop; they do not flow to your receiving dock.
For aluminum pipe fittings this follows ASTM B361 and ASME B16.9, and the documented results ship with the EN 10204 3.1 mill test certificate.
Surface Finishes
| Finish | Description | Typical use |
|---|---|---|
| Mill finish | As-formed, no coating | General piping |
| Anodized (Type II/III) | MIL-A-8625, 5–25 µm | Marine, decorative, wear |
| PVDF / fluorocarbon | UV-stable fluoropolymer | Exterior, long life |
| Polished / bright | Mechanical polish, lower Ra | Food, pharma, hygiene |
Applications
Marine & offshore - topside and utility lines; low weight and corrosion resistance.
Chemical processing - nitric acid, ammonia, organic solvent lines where aluminum is compatible.
HVAC & refrigeration - chilled-water and refrigerant mains; lightweight, non-sparking.
Architectural - handrails, façade frames, structural routes.
Pneumatic conveying - food, plastic, cement lines; smooth bore reduces degradation.
Rail & transport - lightweight pipe routes in rolling stock.
Irrigation - anodized outdoor mains with long life in acidic water.
Compressed air - plant air lines; non-sparking and corrosion resistant.
Aluminum Alloy Comparison
Typical values at common tempers; confirm exact figures from the mill test certificate.
| Grade / Temper | UTS MPa | Yield MPa | Elong % | Density g/cm³ | Notes |
|---|---|---|---|---|---|
| 6061-T6 | 310 | 276 | 12 | 2.70 | Balanced strength + weldability |
| 6063-T6 | 241 | 214 | 12 | 2.70 | Better finish, lower strength |
| 6082-T6 | 310 | 260 | 12 | 2.70 | Strong 6xxx, common in Europe (HE30) |
| 5083-O | 290 | 145 | 20 | 2.66 | Best seawater resistance |
| 5052-H32 | 228 | 159 | 12 | 2.68 | Good marine + formable |
| 3003-H14 | 150 | 130 | 10 | 2.73 | Low cost, formable |
| 1060-O | 95 | 35 | 35 | 2.71 | Pure Al, high corrosion/conductivity |
Why Choose GNEE
Delivery starts at confirmation, not at production. Once your drawing or sample is confirmed, we track three points - first article / setup, production schedule, and pre-shipment check - and share progress at each. For custom items, material, process, and revision changes all affect the plan; when something shifts, we confirm the impact range first, then give you the next step and a time point. If an issue appears, we identify the stage, explain the temporary fix and the corrective owner, so you are not chasing status. The aim is to keep problems at the front end, where they cost less to solve.
GNEE supplies aluminum butt-weld fittings with documented traceability and 18 years of export experience serving distributors, fabricators, and EPC contractors.
Lead time: Standard elbows ship in 15–30 days. Stock programs cover common sizes, and expedited production is arranged when schedules are tight; we confirm a realistic date before you order.
Alloy range: One source for 6061, 6063, 6082, 5083, 5052, 3003, and 1050/1060, so you match the grade to the service instead of compromising.
Customization: 45°, 180°, and 3D/5D bends, non-standard walls, and special end prep from your drawings, with technical review before production.
Mill Test Certificate: Each order ships with EN 10204 3.1 MTC, dimensional and visual reports, and PMI on request - ready for your ASME B31.3 submission.
Packaging: Fumigation-free wooden cases or pallets with end caps and export-grade wrapping that prevent transit damage and keep freight volume low.
Contact now for a quote matched to your alloy, size range, and destination port.
FAQ
Q1: What standard covers your aluminum 90° long radius elbow?
A: Made to ASTM B361 with dimensions per ASME B16.9 and weld ends per ASME B16.25.
Q2: Which alloy should I choose?
A: 6061/6082 for strength and weldability, 5083/5052 for marine, 3003 for low-cost utility, 1050/1060 for purity and conductivity. See each grade's page for full data.
Q3: What is the pressure rating?
A: Working pressure depends on size, wall schedule, alloy, and design code. Send size, schedule, and medium and we confirm a rating per ASME B31.3 [To be confirmed for your exact condition].
Q4: Can these elbows be welded?
A: Yes, with ER4043 or ER5356 filler and a qualified procedure; note HAZ strength loss in 6xxx grades.
Q5: What documents ship with the order?
A: EN 10204 3.1 MTC, dimensional inspection report, and packing list; extra NDT/PMI on request.