4045/3003/4045 Aluminium Cladding Strip

2026-03-18

As a core product of Haomei Aluminum's over 20 years of experience in the aluminum processing and export sector, the 4045/3003/4045 aluminum cladding strip is specifically developed and manufactured for evaporator fins and air coolers. Combining our export experience serving over 20 countries and regions worldwide, from structural design and process control to performance adaptation, it comprehensively meets the stringent usage requirements of heat exchange equipment.

Structurally, 4045/3003/4045 aluminium cladding strip adopts a symmetrical composite structure of "brazed layer-core layer-brazed layer," precisely matching the core requirements of brazing assembly and heat exchange in heat exchange equipment.
The outer layer is made of 4045 aluminum alloy with a silicon content controlled between 9.0% and 11.0%. As a brazing layer, its melting point is lower than the core layer, allowing for uniform melting during brazing to form a dense joint. This ensures a strong bond between the fins and the piping, preventing desoldering and leakage during heat exchange.
The middle core layer is made of 3003 aluminum alloy with a manganese content of 1.0% to 1.5%. It possesses excellent thermal conductivity and corrosion resistance, serving as the core support for heat exchange efficiency and structural strength. Its internal α-Al(Fe,Mn)Si precipitates effectively enhance the material's mechanical properties, preventing deformation during long-term service.
The three-layer composite structure is manufactured using a cold-rolling process, achieving an interface bonding rate of over 99.9%. It is free of delamination and inclusions, structurally eliminating heat exchange efficiency loss and service life reduction.

Specifications of 4045/3003/4045 aluminum cladding strip are tailored to export and actual production needs, and can be customized to fit various heat exchange equipment. Thickness ranges from 0.08mm to 0.3mm, width from 6mm to 1600mm, with thickness tolerance strictly controlled within ±3.0% to ±4.0%, width tolerance ≤ ±2.0mm, and end-face misalignment no greater than 1mm, fully complying with international standards such as ASTM and EN. Bonding rate of 5%-15% is customizable, with precise and controllable bonding tolerances to adapt to different brazing process requirements. The surface is degreased and sanded, free of oxide layer and oil stains, and can be directly used for brazing production, reducing customer pre-treatment steps. Export standard core inner diameters are 305mm and 405mm, with a maximum outer diameter of 1600mm, featuring a jointless design for easy sea freight storage and subsequent processing.

Core technologies of aluminum brazing sheet strip focus on process optimization and performance upgrades, highlighting Haomei's unique advantages.
The production process employs a precise temperature-controlled homogenization annealing process, strictly controlling soaking time and temperature to avoid coarse Mn precipitates in the 3003 core layer, ensuring stable material mechanical properties.
The initial cold-rolling reduction rate is controlled at 30%-50%, with subsequent single-pass reductions at 20%-30%. Intermediate annealing is performed when the cumulative reduction reaches 60%-70%, ensuring tight bonding between the three layers.
The pre-finishing annealing temperature is controlled at 320-400℃, precisely regulating material hardness and elongation, balancing formability and anti-sagging properties, making it suitable for high-speed fin stamping.
Simultaneously, the entire process complies with RoHS compliance requirements, strictly controlling the content of hazardous substances such as lead and cadmium, allowing direct export to the EU and other regions without additional compliance testing.

Practical advantages of our 4045/3003/4045 aluminium cladding strip product combined with export experience precisely address customer pain points.
With a thermal conductivity ≥180W/(m·K), heat exchange efficiency is 8%-12% higher than ordinary composite aluminum strips, making it suitable for various high and low temperature heat exchange scenarios.
It is resistant to moisture and media corrosion, showing no significant corrosion after 48 hours of salt spray testing, making it suitable for complex operating conditions such as air conditioning, cold chain, and industrial cooling.
Its lightweight characteristics are significant, reducing weight by more than 30% compared to traditional steel, lowering the overall weight of equipment and shipping costs.
For export services, we can provide customized specifications, material certificates, RoHS test reports, and other complete customs clearance documents. We are familiar with the import standards of different countries, and the delivery cycle is controlled within 7-35 days. We can optimize packaging according to customer needs to avoid scratches and deformation during sea transport.

Leveraging Haomei's advanced rolling equipment and mature export service system, 4045/3003/4045 aluminium cladding strip has been widely used by various evaporator and air cooler manufacturers worldwide. We provide full technical support from product design to delivery, helping customers enhance their product competitiveness.

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