High Quality 4045/3003/4045 Clad Aluminum Sheet

2025-03-21

4045/3003/4045 clad aluminum sheet is a three-layer symmetric structure of composite materials, through the metallurgical bonding technology will be different properties of aluminum alloy laminated composite. Common thickness of 4045/3003/4045aluminum alloy clad sheet are 0.2mm(4045)/0.4mm(3003)/0.2mm(4045) (total thickness 0.8mm), 1.0mm(4045)/2.0mm(3003)/1.0mm(4045) (total thickness 4.0mm).

Utilizing the high-temperature brazing performance of 4045 aluminum alloy and the structural strength of 3003 aluminum alloy, the synergistic effect of “outer layer can be brazed and core layer can bear the force” is realized. The high cost brazing alloy (4045) is used only for the surface, while the core layer is made of the economical 3003 aluminum alloy to reduce the overall material cost. The structure is designed as follows:
- Outer layer (surface layer): 4045 aluminum alloy (Al-Si alloy, silicon content 9.0%-11.0%)
- Middle layer (core layer): 3003 aluminum alloy (Al-Mn alloy, manganese content 1.0%-1.5%)
- Composite method: Usually hot rolled composite process (Roll Bonding), through high temperature and high pressure to make the metal layers of atomic diffusion to form a metallurgical bond.

Characteristic analysis of each layer of materials
1. Outer layer (4045 aluminum alloy)
- Composition characteristics: High silicon content (Si 9% -11%) significantly reduces the melting point (about 580 ° C) and enhances liquid fluidity.
- Core performance:
Excellent brazing performance: suitable for flame brazing and furnace brazing, forming dense welds.
Heat resistance: Silicon element enhances high-temperature oxidation resistance.
Low coefficient of expansion: reduces deformation caused by thermal stress.
- Typical applications: Automotive radiators, heat exchanger brazed surfaces.

2. Intermediate layer (3003 aluminum alloy)
- Composition characteristics: Manganese (Mn) is the main alloying element, containing small amounts of copper (Cu) and iron (Fe).
- Core performance:
Corrosion resistance: Mn element forms Al-Mn compounds, enhancing resistance to seawater and atmospheric corrosion.
Processing performance: The cold rolling elongation can reach 20% -30%, suitable for deep drawing and bending.
Medium strength: The tensile strength is about 120-160MPa (H14 state).
- Typical applications: tanks, building decorative panels, ship structures.

Hot rolling composite process steps of aluminum brazing sheet 4045/3003/4045 are:
- Surface treatment: Acid wash, brush and grind the 4045 and 3003 plates to remove the oxide film.
- Stacked blanks: stacked in the order of 4045/3003/4045, with edges welded and fixed.
- Hot rolled composite: heated to 400-500 ° C, achieved interlayer atomic diffusion bonding through multiple passes of rolling (reduction rate of 60% -80%).
- Annealing treatment: eliminates internal stress and improves interface bonding strength.

Core performance advantages of 4045/3003/4045 clad aluminum sheet including:
- Multi functional integration:
The surface layer 4045 achieves efficient brazing, while the core layer 3003 provides structural support and corrosion resistance. In the car heat exchanger, the 4045 layer is brazed with copper tubes, and the 3003 core layer resists coolant corrosion.
- Lightweight and economical:
Compared to the full 4045 board, composite board reduces weight by 15% -20% and material costs by 30% -40%.
- Improved anti fatigue performance:
The high toughness of the 3003 core layer suppresses crack propagation, and the fatigue life of the composite plate is 3-5 times longer than that of the single-layer 4045 (ASTM E466 test).
- Thermal expansion matching:
The overall thermal expansion coefficient of the composite board is between 4045 and 3003, which reduces the brazing thermal stress.

Typical application areas of 4045/3003/4045 aluminum alloy clad sheet covers:
1. Automotive thermal management system
Application scenarios: radiators, intercoolers, evaporator cores.
2. Refrigeration equipment
Condenser/evaporator: Composite panels replace traditional all aluminum fins, increasing heat transfer efficiency by 12% -15%.
3. Architectural decoration
Curtain wall panel: The surface can be anodized and colored with 4045 layers, and the core layer 3003 provides wind pressure resistance strength.
4. Shipbuilding
Seawater pipeline: The composite plate brazed joint has a seawater corrosion resistance life of more than 10 years (ISO 9227 salt spray test).

The 4045/3003/4045 clad aluminum sheet has achieved a perfect balance between brazing performance, structural strength, and economy through material innovation and process optimization, becoming the preferred material in fields such as heat exchangers and automotive components.

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