5052 Aluminum Tubing

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

1. Hot Rolling: Initial reduction at 400-450°C to 12mm thickness
2. Cold Drawing: 15-25% area reduction per pass

• H32: 8-15% total reduction
• H34: 16-24% total reduction
• H38: 25-30% total reduction
  3. 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

1. Orbital Welding:

• Rotation speed: 4-10 RPM
• Current pulsation: 150Hz with 40% background
  2. Brazing:
• Aluminum-silicon filler: BAISi-4 (4047 alloy)
• Torch temperature: 590-620°C
  3. 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.