5052 Aluminum Tubing
5052 extruded aluminum seamless pipe is an excellent choice for many industrial applications. It is made of high-quality aluminum alloy and has excellent corrosion resistance, making it very suitable for use in harsh environments.
1. Material Composition & Standards
Conforming to ASTM B210, AMS 4005, and EN 573-3 standards, 5052 aluminum tubing features a magnesium-enriched alloy composition optimized for marine and industrial applications:
Primary Elements:
Magnesium (Mg): 2.2-2.8% (enhances strength and corrosion resistance)
Chromium (Cr): 0.15-0.35% (improves stress corrosion cracking resistance)
Base Material:
Aluminum (Al): ≥96.8% (balance)
Impurity Limits:
Iron (Fe): ≤0.40%
Silicon (Si): ≤0.25%
Copper (Cu): ≤0.10%
Manganese (Mn): ≤0.10%
Zinc (Zn): ≤0.10%
The alloy is supplied in strain-hardened tempers including H32 (¼ hard), H34 (½ hard), and H38 (full hard) per ASTM B210 specifications. Third-party verification through NADCAP AC7117 ensures consistent chromium distribution critical for pitting resistance in chloride environments.
2. Strength Performance
5052 demonstrates superior ductility-to-strength ratios ideal for pressure vessels and structural forms:
|
Property |
H32 Temper |
H34 Temper |
H38 Temper |
Test Standard |
|
Tensile Strength (Rm) |
195-240 MPa |
230-275 MPa |
270-305 MPa |
ASTM E8 |
|
Yield Strength (Rp0.2) |
160-195 MPa |
195-230 MPa |
250-285 MPa |
ASTM E8 |
|
Elongation at Break (%) |
12-18% |
8-12% |
5-8% |
ASTM E8 |
|
Shear Strength |
125 MPa |
145 MPa |
170 MPa |
ASTM B769 |
|
Burst Pressure (OD20×WT2mm) |
18.5 MPa |
23.1 MPa |
28.7 MPa |
ASTM B641 |
|
Fatigue Endurance (10⁷ cycles) |
100 MPa |
115 MPa |
130 MPa |
ISO 1099 |
|
Impact Toughness (20°C) |
27 J |
22 J |
15 J |
ASTM E23 |
Retains >95% strength at -40°C and demonstrates consistent compressive yield strength within 2% of tensile values.
3. Heat Treatment & Processing
As a non-heat-treatable alloy, mechanical properties are achieved through strain hardening:
Cold Working Process
Hot Rolling: Initial reduction at 400-450°C to 12mm thickness
Cold Drawing: 15-25% area reduction per pass
H32: 8-15% total reduction
H34: 16-24% total reduction
H38: 25-30% total reduction
Stabilization: 150°C for 60 minutes to relieve residual stresses
Resulting Microstructure
Grain size: ASTM 7-10 (5-15μm elongated grains)
Dislocation density: 10⁹/cm² (H32) to 10¹⁰/cm² (H38)
Texture coefficient: <0.7 for deep drawing applications
Recrystallization threshold: 260-280°C
Post-forming annealing is permitted at 345°C for stress relief without property degradation.
4. Dimensions & Customization
Manufactured to marine engineering standards with enhanced corrosion allowances:
|
Parameter |
Standard Range |
Precision Tolerance |
Custom Options |
|
Outer Diameter |
6-300 mm |
±0.1% OD |
Oval/rectangular profiles |
|
Wall Thickness |
0.5-12 mm |
+10%/-5% WT |
Variable wall sections |
|
Length |
1-12 m |
+3mm/-0mm |
Coiled lengths 30m+ |
|
Straightness |
- |
1mm/m max. |
±0.3mm/m |
|
Ovality |
- |
≤1.0% TIR |
≤0.3% TIR |
|
Bend Radius (min) |
1.5× OD |
±5% |
Tight radius: 0.75× OD |
Fabrication Capabilities:
CNC rotary draw bending (up to 180° bends)
Hydroforming for complex cross-sections
Expanded ends for tube-to-tube joining
Thread rolling per ASME B1.20.1
5. Corrosion Resistance Properties
Environmental Performance Ratings
|
Environment |
ISO 9223 Rating |
Corrosion Rate (μm/yr) |
Protection Recommendation |
|
Marine Offshore |
RC5 (Excellent) |
<5 μm/yr |
MIL-PRF-85582 marine coat |
|
Chemical Process |
RC4 (Good) |
8-20 μm/yr |
PVDF lining |
|
Coastal Atmosphere |
RC4 (Good) |
5-15 μm/yr |
Anodize Type IIB |
|
Deicing Salt Exposure |
RC4 (Good) |
10-25 μm/yr |
Ceramic-epoxy coating |
Protection Systems:
Anodizing:
Type IIB (hard coat): 25-75μm thickness
Chromic acid (Type I): 5-8μm for thin walls
Coatings:
Fluoropolymer systems (PVDF): 30-50μm DFT (30-year warranty)
Ceramic-modified epoxies: 200μm DFT
Thermal spray aluminum (TSA): 150μm arc-sprayed layer
Galvanic Isolation: Dielectric unions for dissimilar metal connections
6. Machinability Characteristics
Optimization Parameters
|
Operation |
Tool Material |
Speed (m/min) |
Feed (mm/rev) |
Notes |
|
Turning |
Carbide K01 |
300-500 |
0.20-0.40 |
Positive rake geometries |
|
Milling |
Carbide K10 |
400-600 |
0.10-0.20 |
6-flute end mills preferred |
|
Drilling |
TiN Coated |
70-100 |
0.05-0.12 |
118° point angle |
|
Tapping |
HSS-Co8 |
15-25 |
Pitch matched |
85% thread depth |
Performance Metrics:
Machinability index: 80% (baseline: 2011-T3=100%)
Surface roughness: Ra 0.4μm achievable
Built-up edge resistance: Class 3 (ISO 3685)
Chip formation: Continuous chips requiring breakers
Coolant recommendation: 7-10% emulsion concentration
7. Weldability & Joining Methods
Exceptional Fusion Weldability
GTAW and GMAW approved per AWS D1.2 procedures:
Gas Tungsten Arc Welding (GTAW)
Filler wire: ER5356 (AlMg5Cr) or ER5556
Shielding gas: Ar +25-30% He mixture
Heat input: <1.2 kJ/mm
Interpass temp: <100°C
Tube-to-Tube Joining
Orbital Welding:
Rotation speed: 4-10 RPM
Current pulsation: 150Hz with 40% background
Brazing:
Aluminum-silicon filler: BAISi-4 (4047 alloy)
Torch temperature: 590-620°C
Mechanical Connections:
Swagelok fittings: Up to 400bar working pressure
Victaulic grooved couplings: Size range 15-300mm
8. Physical Properties
|
Property |
Value |
Test Standard |
|
Density |
2.68 g/cm³ |
ASTM B311 |
|
Thermal Conductivity (25°C) |
138 W/m·K |
ASTM E1461 |
|
CTE (20-100°C) |
23.8 μm/m·°C |
ASTM E228 |
|
Electrical Resistivity |
47 nΩ·m |
ASTM B193 |
|
Modulus of Elasticity |
70.3 GPa |
ASTM E111 |
|
Magnetic Permeability |
1.02 μH/m |
ASTM A342 |
|
Sound Velocity |
5150 m/s |
ASTM E494 |
|
Emissivity (100°C) |
0.10 (polished) |
ASTM C835 |
|
Reflectivity (visible) |
75-85% |
ASTM E903 |
9. Surface Quality Standards
Seamless (ASTM B210) or welded (ASTM B491) construction
Surface finishes:
Mill finish: Ra 0.5-1.5μm
Smooth finish: Ra 0.2-0.5μm (for sanitary applications)
Mirror polish: Ra <0.025μm achievable
Defect classification (EN 10246-14):
Scratches: ≤0.03mm depth
Die lines: ≤0.1% OD
Inclusion size: ≤0.2mm
No visible seam on welded tubes
Cleaning protocols:
Electropolishing per ASTM B912
Degreasing to AMS 2658 Class D
10. Certifications & Testing
Non-Destructive Testing
Eddy Current: ASTM E309 with 0.25mm sensitivity
Hydrostatic: 1.5× design pressure for 60 seconds
Helium Leak Testing: <10⁻⁶ mbar·L/s sensitivity
Ultrasonic Wall Measurement: ±0.01mm resolution
Material Certifications
NORSOK M650 approved for offshore applications
PED 2014/68/EU Annex I compliance
FDA CFR 21.177.1500 for food contact
AD2000-Merkblatt HP0 approved for pressure vessels
Lloyd's Register Type Approval Certificate
Marine Applications: Hull penetrations, railings, masts, heat exchangers, fuel lines, and desalination components where seawater corrosion resistance is paramount.
Packaging: VCI foam-end caps + shrink-wrap bundles, wooden crates with polyethylene moisture barrier. Standard lead time: 4 weeks for stocked sizes.
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