Automotive Aluminum Radiator Fins - Lightweight & Durable - 3003 Alloy

Aluminum heat sink fins are thin-sheet heat dissipation elements made from aluminum alloys (such as 1050, 3003, 6063, etc.) through stamping, extrusion, or bending processes. They increase heat exchange efficiency by increasing the surface area and are widely used in active/passive cooling systems.

Classification :

PRODUCT DETAILS

Product Features
1. High-Quality Alloy Composition:
Al-Mn alloy (3003) containing manganese (Mn 1.0-1.5%) enhances strength and corrosion resistance.
Low impurities (Fe ≤ 0.7%, Si ≤ 0.6%) ensure weldability and forming stability.
2. Lightweight Design:
With a density of only 2.73 g/cm³ (60% lighter than copper), it reduces vehicle weight and optimizes fuel efficiency.
3. High Corrosion Resistance:
A naturally formed Al₂O₃ oxide layer on the surface resists corrosion from moisture, antifreeze, and salt spray, making it suitable for long-term use.
4. Highly Efficient Heat Transfer:
With a thermal conductivity of 193 W/(m·K), it quickly dissipates engine heat to prevent overheating.
The wavy/louvered fin design increases heat dissipation area and improves airflow efficiency by over 20%. 🔧 Process Advantages:
Precision stamping, thickness range 0.1-0.3mm (±0.02mm tolerance), ensuring consistency.
Optional hydrophilic coating reduces scale adhesion and extends lifespan.
Chemical properties:

Element

3003 Aluminum Alloy
3003

Impact on Performance

Al 

Balance 

Base material 

Mn 

1.0-1.5%

↑ Strength & corrosion resistance

Fe 

≤0.7%

Affects formability 

Si 

≤0.6%

↓ Ductility if excessive 

Cu

0.05-0.20%

↑ Strength 

Others

≤0.15% (each)

Controlled impurities 

Mechanical properties:

Property

3003-H14 (Hard Temper)
3003-H14 

Test Standard

Tensile Strength

145-195 MPa

ASTM B557 / GB/T 228.1

Yield Strength

125-170 MPa

ISO 6892-1

Elongation

8-12%

ASTM E8

Hardness (Brinell HB)

40 HB

ASTM E10

Thermal Conductivity

193 W/(m·K)

ASTM E1461

Melting Range

640-655°C

ASTM E794

Applications:
1. Traditional Fuel Vehicle Systems
Applicable Components:
Engine Radiators
The wavy/louvered fin design enhances airflow and heat dissipation efficiency, preventing engine overheating.
Corrosion resistance (500 hours salt spray test) allows for long-term exposure to antifreeze and rain.
Intercoolers
Lightweight (60% lighter than copper) reduces the load on the turbocharger system and improves fuel economy.
AC Condensers
High thermal conductivity (193 W/(m·K)) rapidly cools refrigerant, optimizing air conditioning performance.
Advantages:
Compatible with brazing/epoxy bonding processes, seamlessly bonding to copper or aluminum tubing.
The manganese element in the 3003 alloy enhances corrosion resistance, making it suitable for high-temperature and high-humidity environments. 

2. New Energy Vehicle (EV/HEV) Systems
Applied Components:
Battery Cooling Plates
Ultra-thin fins (0.1-0.3mm) directly contact the battery module for uniform temperature distribution.
Optional hydrophilic coating reduces coolant scaling.
Electric Drive System Radiators (EDU Coolers)
Vibration-resistant design (yield strength 125 MPa) to withstand high-frequency motor vibrations.
Advantages:
Meets lightweighting requirements for electric vehicles (weight reduction and increased range).
Non-magnetic, preventing interference with battery management system (BMS) signals.
3. Commercial and Special Vehicles
Applied Components:
Heavy-Duty Truck Radiators
Thickened fins (0.3-0.5mm) meet high-load heat dissipation requirements.
Construction Equipment Cooling Systems
Dust-resistant design (adjustable spacing) adapts to dusty working conditions.
Advantages:
High-pressure washdown resistance for harsh field environments. The cost is 40-50% lower than copper cooling systems.

Customer Praise

Our products have been exported to over 50 countries including Southeast Asia, the Middle East, Africa, Latin America, and Europe for a long time, serving overseas traders, engineering contractors, and large-scale manufacturing factories.

APPLICATION FIELD

High-rise buildings

High-rise buildings

Offshore drilling

Offshore drilling

Car squeak

Car squeak

Shipbuilding

Shipbuilding

Large venues

Large venues

Mechanical processing

Mechanical processing

Steel smelting

Steel smelting

Tall Buildings

Tall Buildings

FACTORY WORKSHOP

Factory workshop
Factory workshop
Factory workshop
Factory workshop
Factory workshop
Factory workshop

FAQ

Q: How long is the delivery cycle usually? Can we expedite production?

A:Spot goods can be shipped within 3-7 days, customized deep processing takes 15-25 days, and urgent orders can be coordinated with the production line for priority scheduling.

Q: How to protect copper packaging from oxidation and scratches during sea transportation?

A:Adopting moisture-proof and rust proof film, reinforced with wooden brackets, and filled with desiccants inside the copper pipes, it is suitable for long-term ocean transportation.

Q: Can environmentally friendly lead-free brass meet European and American import regulations?

A:C3604 lead-free brass complies with RoHS and California 65 standards, with no excessive heavy metals, and smoothly passes through Europe and America.

Q: Can I handle the full set of export documents required for customs clearance?

A:We can provide a complete set of documents such as commercial invoices, packing lists, certificates of origin, inspection reports, and metal material certificates.

Q: What international trade transaction terms can be used for exports?

A:FOB, CIF, CFR, DAP, DDP are all operable and suitable for customs clearance in ports around the world.

Q: What is the minimum order quantity and does it support sample orders?

A:Regular inventory can be shipped in small quantities, new product samples can be ordered in small quantities, and large quantities can enjoy tiered factory prices.

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